A,B,C Weighting Filter vi

How can I make an A,B,C Weighting Filter vi for my Sound Pressure Level Meter project....???
IF there is one already made please send it to me.......[email protected]
Thanks.....

If you Google "C-weighted filter" you will find the transfer functions for the filters. (www.ptpart.co.uk/noise.htm or www.cross-spectrum.com/audio/weighting.html for example). Those could then be implemented using standard LV filter VIs.
Lynn

Similar Messages

Analog Audio Signal to Decibels with an A weighting filter.

I have a microphone attached to a pre amp. The sensitivity is about 15mv/pa.
In labview I have written the A weighting filter myself. I want to know what the procedure is
for audio processing in labview. Should I convert the signal to Pascal via the sensitivity of the mic and then convert to decibels (20log(signal/20ref)) and
then take the FFT to apply my weighting filter? Do I need to convert the signal to a powerspectrum? Sort of confused on the process.

Hi ykhalil,
Here's a pretty detailed explanation of signal processing in LabVIEW:
https://decibel.ni.com/content/docs/DOC-3022/version/1
Also, are you using the NI Sound and Vibration Toolkit?
Regards,
Lindsey W. | Applications Engineer | National Instruments

A weight filter for Psophometric measurement

May I know which Icon or how to contstruct an A weight filter for Psophometric measurement in Labview. Currently I use the A weight filter is found in Panasonic Audio Analyzer (VP-7722A) for testing.

Designing these sorts of weighting filters can be tricky. There is no design method that ships with LabVIEW that will cover this well. If your sample rate is pretty high, you could take the analog specification of the filter and use a bilinear transform with pre-warping (at the critical frequency of the A-weight spec) to get the digital filter.
The easy way to get these filters is to purchase the Sound and Vibration toolkit.

Take FFT data and apply a hand arm weighting filter

I have taken some vibration data and converted it to an FFT then saved this data to a csv file (Freq versus m/s^2). There are three axis of vibration so the file contains four columns: Frequency, X vib, Y vib, Z vib. There are about 1600 lines with frequencies starting at around 25 HZ up to about 19,999 HZ.
Can I take this file, read in the FFT data, and apply a hand-arm weight to the data using the weighting VI or one of my "home made" weighting VIs?
I would like to convert the FFT data to a 1/3 octave spectrum, then weight the spectrum according to ISO-5349 (hand arm vibration).
I know how to do all of this with the raw (time domain) data but this is saved FFT data.
Not sure if the question makes sense, but basically I screwed up and took some vibration numbers, saved the FFT but forgot to apply the 1/3 octave hand arm vibration weight. Just wondering if it can be done later.
Jeff

Hi ykhalil,
Here's a pretty detailed explanation of signal processing in LabVIEW:
https://decibel.ni.com/content/docs/DOC-3022/version/1
Also, are you using the NI Sound and Vibration Toolkit?
Regards,
Lindsey W. | Applications Engineer | National Instruments

Filter Coding Issues

I've been following (roughly) the simple virus scanner interface that SUN provides, and adapted it into a slightly heavier weight filter that interfaces with libclamav. At first both were compiled using GCC, and I thought due to some of the weird problems I had when debugging flags were inserted, maybe Sun Studio would give better results. It hasn't, and I'm at a bit of a loss as to what to do next.
The symptom is that parts of the message just dissapear, and I see the old mime boundaries within the message body, so it seems like there's some pointer indicating where the message starts that's being corrupted by something in my code.
Interestingly, if I stop processing the message while still inside the headers, there is no problem, but that's not a very effective virus scanner if it can only look at the content type and filename of the part now is it?
This happens regardless of whether I use GCC or CC, and I'm using 0.88.1 of clamav. The output message is shown last. It should be fairly obvious what's wrong with it.
Here's my code, perhaps someone can tell me what I'm doing wrong.
** WARNING ** This IS NOT polished code, so please don't expect it to be perfect. It's clean, but includes absolute pathnames, and some other nauties that should be removed before anyone even thinks of reusing this. Once it actually works, I'll do the nessisary code cleanup, and release this to the community to do whatever anyone wants with.
Makefile
SERVER_ROOT=/opt/SUNWmsgsr
INSTALL_LOCATION=/var/opt/SUNWmsgsr/site-programs/
INCLUDE=-I${SERVER_ROOT}/include
LIBPATH=-L${SERVER_ROOT}/lib
CLAMLIBS=`/usr/local/bin/clamav-config --libs` -lclamav
CLAMFLAGS=`/usr/local/bin/clamav-config --cflags`
LIBS=-lmtasdk ${CLAMLIBS}
FLAGS=${CLAMFLAGS}
all:
        cc ${FLAGS} -o msgsr_clamav msgsr_clamav.c \
                ${INCLUDE} ${LIBPATH} ${LIBS}
install:
        cp msgsr_clamav ${INSTALL_LOCATION}
        cp msgsr_clamav.cnf ${INSTALL_LOCATION}************************************************
Expansions
CLAMLIBS=-L/usr/local/lib -lz -lbz2 -lpthread -lclamav
CLAMFLAGS=-I/usr/local/include -xO4************************************************
msgsr_clamav.c
* msgsr_clamav
* Interface the Sun Java System Message Server with LibClamAV
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <pthread.h>
#include "clamav.h"     // LibClamAV Header
#include "mtasdk.h"
* A structure to store channel options
typedef struct {
     /* Produce debug output? */
     int debug;
     // Maximum size (in bytes) attachment to scan
     int scan_maxsize;
     // Scan recursion level
     int scan_recursion_level;
     // Max files
     int scan_maxfiles;
     // Path to ClamAV Virus Database
     char db_dir[BIGALFA_SIZE+3];
     // Used Internally by ClamAV. Stored here for ease of access
     struct cl_node *root;
     unsigned int signo;
     struct cl_stat dbstat;
     pthread_mutex_t reload_mutex;
     // MIME types to ignore
     char ignore_mime_types[BIGALFA_SIZE+3];
     // Types of files to ignore
     char ignore_file_types[BIGALFA_SIZE+3];
     /* Unwanted MIME content types (ALWAYS stripped, never scanned) */
     char bad_mime_types[BIGALFA_SIZE+3];
     /* Unwanted file types (ALWAYS stripped, never scanned)*/
     char bad_file_types[BIGALFA_SIZE+3];
     /* Length of bmt string */
     size_t bmt_len;
     /* Length of bft string */
     size_t bft_len;
} our_options_t;
// A structure passed per message to contain message specific data, including open files, etc.
typedef struct {
     // The filename of the temp file in use so it can be unlinked when we're done with it.
     char temp_file_name[BIGALFA_SIZE * 2 + 10];
     // The file * to the temp file in use, so we don't have to reopen it across calls to decode_inspect
     FILE *temp_file;
     // A pointer to the single instance of our_options_t that is shared across all threads
     our_options_t * options;
} msg_temp_data_t;
* Forward declarations
static void error_exit(int ires, const char *msg);
static void error_report(our_options_t *options, int ires, const char *func);
static void error_reports(our_options_t *options, const char* errStr, const char *func);
static int is_bad_mime_type(our_options_t *options, mta_decode_t *dctx, char *buf, size_t maxbuflen);
static int is_bad_file_type(our_options_t *options, mta_opt_t *params, const char *param_name, char *buf, size_t maxbuflen);
static int load_options(our_options_t *options);
static mta_dq_process_message_t process_message;
static mta_decode_read_t decode_read;
static mta_decode_inspect_t decode_inspect;
* main() -- Initialize the MTA SDK, load our options, and then
* start the message processing loop.
int main()
     int ires,ret;
     char error_msg[BIGALFA_SIZE+3];
     our_options_t options;
     * Initialize the MTA SDK
     * See explanatory comment 1
     if ((ires = mtaInit(0)))
          error_exit(ires, "Unable to initialize the MTA SDK");
     * Load our channel options
     * See explanatory comment 2
     if ((ires = load_options(&options)))
          error_exit(ires, "Unable to load our channel options");
     * Initialize the ClamAV Virus Engine and Database
     // Preconditions to initializing the ClamAV database
     options.root=NULL; options.signo=0;
     // Load the virus database
     mtaLog("cl_loaddbdir() loading database from %s",options.db_dir);
     if ((ret = cl_loaddbdir(options.db_dir, &options.root, &options.signo)))
          sprintf(error_msg,"cl_loaddbdir() error: %s", cl_strerror(ret));
          error_exit(MTA_NO,error_msg);
     mtaLog("cl_loaddbdir() loaded %d virus definitions",options.signo);
     // Internalize the virus database structure
     mtaLog("cl_build() initializing database");
     if((ret = cl_build(options.root)))
          sprintf(error_msg,"cl_build() error: %s", cl_strerror(ret));
          error_exit(MTA_NO,error_msg);
     // Keep track of database updates
     memset(&options.dbstat, 0, sizeof(struct cl_stat));
     cl_statinidir(options.db_dir, &options.dbstat);
     // Initialize our reload mutex
     if (ret = pthread_mutex_init(&options.reload_mutex,NULL))
          sprintf(error_msg,"pthread_mutex_init() error: %d", ret);
          error_exit(MTA_NO,error_msg);
     * Now process the queued messages. Be sure to indicate a
     * thread stack size sufficient to accomodate message
     * enqueue processing.
     * See explanatory comment 3
     if ((ires = mtaDequeueStart((void *)&options,
     process_message, NULL, 0)))
     error_exit(ires, "Error during dequeue processing");
     * All done
     cl_free(options.root);
     mtaDone();
     return(0);
*Reloads the virus database and re-initializes the in memory structure
* Loads a new virus database, then if all succeeds, it
* swaps the new database with the old one. It's assumed
* clamav releases the database gracefully, but another mutex
* may be required if this is not the case.
static int reload_database(our_options_t *options)
     struct cl_node *newroot = NULL,*oldroot;
     char error_msg[BIGALFA_SIZE+3];
     int ret;
     unsigned int signo=0;
     if (pthread_mutex_trylock(&options->reload_mutex)) {     // Only one reload at a time thank you.
          if(cl_statchkdir(&options->dbstat) == 1) {     // Make sure we actually need an update
               mtaLog("reload_database() Virus database is stale... reloading");
               mtaLog("cl_loaddbdir() reloading database from %s",options->db_dir);
               // Load the new virus database
               if ((ret = cl_loaddbdir(options->db_dir, &newroot, &signo)))
                    mtaLog("cl_loaddbdir() error: %s", cl_strerror(ret));
                    return (-1);
               mtaLog("cl_loaddbdir() loaded %d virus definitions",options->signo);
               // Internalize the virus database structure
               mtaLog("cl_build() re-initializing database");
               if((ret = cl_build(newroot)))
                    mtaLog("cl_build() error: %s", cl_strerror(ret));
                    mtaLog("reload_database() Database reload aborted");
                    cl_free(newroot);
                    return (-2);
               // Save a pointer to the old root
               oldroot = options->root;
               // Swap in the new root and signo
               options->root = newroot;
               options->signo = signo;
               // Release the old root
               cl_free(oldroot);
               mtaLog("database_reload() Successfully loaded new virus database");
               // Keep track of database updates
               cl_statfree(&options->dbstat);
               cl_statinidir(options->db_dir, &options->dbstat);
          pthread_mutex_unlock(&options->reload_mutex);
* process_message() -- This routine is called by
* mtaDequeueStart() to process each queued
* message. We don稚 make use of ctx2, but
* ctx1 is a pointer to our channel options.
* See explanatory comment 4
static int process_message(void **ctx2, void *ctx1, mta_dq_t *dq, const char *env_from, size_t env_from_len)
     const char *adr;
     int disp, ires;
     size_t len;
     mta_nq_t *nq;
     msg_temp_data_t msg_data;
     * Initializations
     nq = NULL;
     msg_data.options = (our_options_t *)ctx1;
     msg_data.temp_file = NULL;
     * Check the virus database to make sure it isn't stale
     * If it it's not currently reloading, and is stale, reload it.
     //if(cl_statchkdir(&(msg_data.options->dbstat)) == 1)
     //     reload_database(msg_data.options);
     * A little macro to do error checking on mta*() calls
     #define CHECK(f,x) \
     if ((ires = x)) { error_report(msg_data.options, ires, f); goto \
          done_bad; }
     * Start a message enqueue. Use the dequeue context to copy
     * envelope flags fromt the current message to this new
     * message being enqueued.
     * See explanatory comment 5
     CHECK("mtaEnqueueStart", mtaEnqueueStart(&nq, env_from, env_from_len, MTA_DQ_CONTEXT, dq, 0));
     * Process the envelope recipient list
     * See explanatory comment 6
     while (!(ires = mtaDequeueRecipientNext(dq, &adr, &len, 0)))
          * Add this envelope recipient address to the message
          * being enqueued. Use the dequeue context to copy
          * envelope flags for this recipient from the current
          * message to the new message.
          ires = mtaEnqueueTo(nq, adr, len, MTA_DQ_CONTEXT,
          dq, MTA_ENV_TO, 0);
          /* See explanatory comment 7 */
          disp = (ires) ? MTA_DISP_DEFERRED : MTA_DISP_RELAYED;
          CHECK("mtaDequeueRecipientDisposition", mtaDequeueRecipientDisposition(dq, adr, len,disp, 0));
     * A normal exit from the loop occurs when
     * mtaDequeueRecipientNext() returns an MTA_EOF status.
     * Any other status signifies an error.
     if (ires != MTA_EOF)
          error_report(msg_data.options, ires, "mtaDequeueRecipientNext");
          goto done_bad;
     * Begin the MIME decode of the message
     * See explanatory comment 8
     CHECK("mtaDecodeMessage",
          mtaDecodeMessage(
          /* Private context is our message data structure */
          (void *)&msg_data,
          /* Input is the message being dequeued */
          MTA_DECODE_DQ, (void *)dq,
          /* Output is the message being enqueued */
          MTA_DECODE_NQ, (void *)nq,
          /* Inspection routine */
          decode_inspect,
          /* Convert non-MIME formats to MIME */
          MTA_DECODE_THURMAN,
          0));
     * Finish the enqueue
     * NOTE: IT担 IMPORTANT TO DO THIS before DOING THE
     * DEQUEUE. YOU WILL LOSE MAIL IF YOU DO THE DEQUEUE FIRST
     * and then THE ENQUEUE FAILS.
     * See explanatory text 9
     CHECK("mtaEnqueueFinish", mtaEnqueueFinish(nq, 0));
     nq = NULL;
     * Finish the dequeue
     CHECK("mtaDequeueFinish", mtaDequeueMessageFinish(dq, 0));
     * All done with this message
     return(MTA_OK);
done_bad:
     * Abort any ongoing enqueue or dequeue
     if (nq)
          mtaEnqueueFinish(nq, MTA_ABORT, 0);
     if (dq)
          mtaDequeueMessageFinish(dq, MTA_ABORT, 0);
     * And return our error status
     return(ires);
#undef CHECK
* decode_inspect() -- This is the routine that inspects each
* message part, deciding whether to accept
* or reject it.
* See explanatory comment 10
static int decode_inspect(void *ctx, mta_decode_t *dctx, int data_type,const char *data, size_t data_len)
     char buf[BIGALFA_SIZE * 2 + 10];
     const char *virname;
     int i;
     static unsigned int part_c = 1;
     msg_temp_data_t *msg_data = (msg_temp_data_t *)ctx;
     strncpy(buf,data,data_len);
     buf[data_len] = 0;
     mtaLog("decode_inspect() (%d,%ud): %s",data_type,dctx,buf);
     switch (data_type)
          case MTA_DATA_HEADER:
          * See if the part has:
          * 1. A bad MIME content-type,
          * 2. A bad file name extension in the (deprecated)
          * NAME= content-type parameter, or
          * 3. A bad file name extension in the
          * FILENAME= content-disposition parameter.
          i = 0;
          if ((i = is_bad_mime_type((void *)msg_data->options, dctx, buf, sizeof(buf))) ||
               is_bad_file_type((void *)msg_data->options,mtaDecodeMessageInfoParams(dctx,MTA_DECODE_CTYPE_PARAMS, NULL),"NAME", buf, sizeof(buf)) ||
               is_bad_file_type((void *)msg_data->options,mtaDecodeMessageInfoParams(dctx,MTA_DECODE_CDISP_PARAMS, NULL),"FILENAME", buf, sizeof(buf)))
               char msg[BIGALFA_SIZE*4 + 10];
               * Replace this part with a text message indicating
               * that the part痴 content has been deleted.
               * See explanatory comment 11
               if (i)
                    i = sprintf(msg,
                         "The content of this message part has been removed.\n"
                         "It contained a potentially harmful media type of %.*s",
                         strlen(buf)-2, buf+1);
               else
                    i = sprintf(msg,
                         "The content of this message part has been removed.\n"
                         "It contained a potentially harmful file named '%s'", buf);
               mtaLog("decode_inspect(): %s",msg);
               return(mtaDecodeMessagePartDelete(dctx,
                    MTA_REASON, msg, i,
                    MTA_DECODE_CTYPE, "text", 4,
                    MTA_DECODE_CSUBTYPE, "plain", 5,
                    MTA_DECODE_CCHARSET, "us-ascii", 8,
                    MTA_DECODE_CDISP, "inline", 6,
                    MTA_DECODE_CLANG, "en", 2, 0));
          } break; // case MTA_DATA_HEADER:
          case MTA_DATA_TEXT:
          case MTA_DATA_BINARY:
               if (msg_data->temp_file == NULL)
                    sprintf(msg_data->temp_file_name,"/tmp/%i.tmp",part_c++);
                    mtaLog("messageDecode(): Opening Temp File %s",msg_data->temp_file_name);
                    msg_data->temp_file = fopen(msg_data->temp_file_name,"wb");
               fwrite(data,data_len,1,msg_data->temp_file);
               return(MTA_OK);
               break;
          case MTA_DATA_NONE:
               fflush(msg_data->temp_file);
               fclose(msg_data->temp_file);
               msg_data->temp_file = NULL;
               struct cl_limits limits;
               memset(&limits, 0, sizeof(struct cl_limits));
               /* maximal number of files in archive */;
               limits.maxfiles = 1000;
               /* maximal archived file size */
               limits.maxfilesize = 10 * 1048576; /* 10 MB */
               /* maximal recursion level */
               limits.maxreclevel = 5;
               /* maximal compression ratio */
               limits.maxratio = 200;
               /* disable memory limit for bzip2 scanner */
               limits.archivememlim = 0;
               i = cl_scanfile(msg_data->temp_file_name, &virname, NULL, msg_data->options->root,&limits,CL_SCAN_STDOPT);
               unlink (msg_data->temp_file_name);
               if(i == CL_VIRUS) {
                    char msg[BIGALFA_SIZE*4 + 10];
                    size_t idlen;
                    i = sprintf(msg,
                         "The content of this message part has been removed.\n"
                         "It contained the virus %s in a file named '%s'", virname,buf);
                    mtaDequeueInfo(dctx,MTA_ENV_ID,&buf,&idlen);
                    buf[idlen] = '\0';
                    mtaLog("decode_inspect(): Detected %s virus in part %i of msg ID %s",virname,0,buf);
                    return(mtaDecodeMessagePartDelete(dctx,
                         MTA_REASON, msg, i,
                         MTA_DECODE_CTYPE, "text", 4,
                         MTA_DECODE_CSUBTYPE, "plain", 5,
                         MTA_DECODE_CCHARSET, "us-ascii", 8,
                         MTA_DECODE_CDISP, "inline", 6,
                         MTA_DECODE_CLANG, "en", 2, 0));
               } else {
                    if(i != CL_CLEAN)
                         mtaLog("decode_inspect() Error: %s scanning file %s",cl_strerror(i),msg_data->temp_file_name);
                    else
                         mtaLog("decode_inspect(): Part in file %s is clean",msg_data->temp_file_name);
                    //return(mtaDecodeMessagePartCopy(dctx, 0));
                    return(MTA_OK); break;
     return(MTA_OK);
* is_bad_mime_type() -- See if the part痴 media type is in our
* bad MIME content types, for example:
* application/vbscript
* See explanatory comment 13
static int is_bad_mime_type(our_options_t *options,
mta_decode_t *dctx, char *buf,
size_t maxbuflen)
     const char *csubtype, *ctype;
     size_t i, len1, len2;
     char *ptr;
     * Sanity checks
     if (!options || !options->bmt_len ||
          !options->bad_mime_types[0] ||
          !dctx)
          return(0);
     * Get the MIME content type
     ctype = mtaDecodeMessageInfoString(dctx, MTA_DECODE_CTYPE,NULL, &len1);
     csubtype = mtaDecodeMessageInfoString(dctx,MTA_DECODE_CSUBTYPE,NULL, &len2);
     * Build the string: <0x01>type/subtype<0x01><0x00>
     ptr = buf;
     *ptr++ = (char)0x01;
     for (i = 0; i < len1; i++)
          *ptr++ = tolower(*ctype++);
     *ptr++ = '/';
     for (i = 0; i < len2; i++)
          *ptr++ = tolower(*csubtype++);
     *ptr++ = (char)0x01;
     *ptr = '\0';
     * Now see if the literal just built occurs in the list of
     * bad MIME content types
     return((strstr(options->bad_mime_types, buf)) ? -1 : 0);
* is_bad_file_type() -- See if the part has an associated file
* name whose file extension is in our list
* of bad file names, such as .vbs.
* See explanatory comment 14
static int is_bad_file_type(our_options_t *options,
mta_opt_t *params,
const char *param_name, char *buf,
size_t maxbuflen)
     const char *ptr1;
     char fext[BIGALFA_SIZE+2], *ptr2;
     size_t i, len;
     * Sanity checks
     if (!options || !options->bft_len || !params || !param_name)
          return(0);
     len = 0;
     buf[0] = '\0';
     if (mtaOptionString(params, param_name, 0, buf, &len,
          maxbuflen - 1) ||
          !len || !buf[0])
          * No file name parameter specified
          return(0);
     * A file name parameter was specified. Parse it to
     * extract the file extension portion, if any.
     ptr1 = strrchr(buf, '.');
     if (!ptr1)
          * No file extension specified
          return(0);
     * Now store the string created earlier in fext[]
     * Note that we drop the ・・from the extension.
     ptr1++; /* Skip over the ・・*/
     ptr2 = fext;
     *ptr2++ = (char)0x01;
     len = len - (ptr1 - buf);
     for (i = 0; i < len; i++)
          *ptr2++ = tolower(*ptr1++);
     *ptr2++ = (char)0x01;
     *ptr2++ = '\0';
     * Now return -1 if the string occurs in
     * options->bad_file_types.
     return((strstr(options->bad_file_types, fext)) ? -1 : 0);
* load_options() -- Load our channel options from the channel痴
* option file
* See explanatory comment 15
static int load_options(our_options_t *options)
     char buf[BIGALFA_SIZE+1];
     size_t buflen, i;
     mta_opt_t *channel_opts;
     int ires;
     const char *ptr0;
     char *ptr1;
     * Initialize the our private channel option structure
     memset(options, 0, sizeof(our_options_t));
     * Set internal defaults for important features
     options->scan_maxsize = 10 * 1024 * 1024; // 10 MB
     options->scan_recursion_level = 10;
     options->scan_maxfiles = 200;
     strcpy(options->db_dir,cl_retdbdir()); // Default ClamAV Directory
     * Access the channel痴 option file
     * See explanatory comment 16
     channel_opts = NULL;
     if ((ires = mtaOptionStart(&channel_opts, "/var/opt/SUNWmsgsr/site-programs/msgsr_clamav.cnf", 0, 0)))
          mtaLog("Unable to access our channel option file");
          return(ires);
     * DEBUG=0|1
     options->debug = 0;
     mtaOptionInt(channel_opts, "DEBUG", 0, &options->debug);
     if (options->debug)
          mtaDebug(MTA_DEBUG_SDK, 0);
     * BAD_MIME_TYPES=type1/subtype1[,type2/subtype2[,...]]
     buf[0] = '\0';
     mtaOptionString(channel_opts, "BAD_MIME_TYPES", 0, buf,
     &buflen, sizeof(buf));
     * Now translate the comma separated list:
     * Type1/Subtype1[,Type2/Subtype2[,...]]
     * to
     *<0x01>type1/subtype1[<0x01>type2/subtype2[<0x01>...]]<0x01>
     ptr0 = buf;
     ptr1 = options->bad_mime_types;
     *ptr1++ = (char)0x01;
     for (i = 0; i < buflen; i++)
          if (*ptr0 != ',')
               *ptr1++ = tolower(*ptr0++);
          else
               *ptr1++ = (char)0x01;
               ptr0++;
     *ptr1++ = (char)0x01;
     *ptr1 = '\0';
     options->bmt_len = ptr1 - options->bad_mime_types;
     * BAD_FILE_TYPES=["."]Ext1[,["."]Ext2[,...]]
     buf[0] = '\0';
     buflen = 0;
     mtaOptionString(channel_opts, "BAD_FILE_TYPES", 0, buf,
     &buflen, sizeof(buf));
     * Now translate the comma separated list:
     * ["."]Ext1[,["."]Ext2[,...]]
     * to
     * <0x01>ext1[<0x01>ext2[<0x01>...]]<0x01>
     ptr0 = buf;
     ptr1 = options->bad_file_types;
     *ptr1++ = (char)0x01;
     for (i = 0; i < buflen; i++)
          switch(*ptr0)
               default : /* copy after translating to lower case */
                    *ptr1++ = tolower(*ptr0++);
                    break;
               case '.' : /* discard */
                    break;
               case ',' : /* end current type */
                    *ptr1++ = (char)0x01;
                    ptr0++;
               break;
     *ptr1++ = (char)0x01;
     *ptr1 = '\0';
     options->bft_len = ptr1 - options->bad_file_types;
     * Dispose of the mta_opt_t context
     * See explanatory comment 17
     mtaOptionFinish(channel_opts);
     * And return a success
     return(MTA_OK);
* error_report() ・Report an error condition when debugging is
* enabled.
static void error_report(our_options_t *options, int ires,
const char *func)
     if (options->debug)
          mtaLog("%s() returned %d; %s",
               (func ? func : "?"), ires, mtaStrError(ires,0));
static void error_reports(our_options_t *options, const char* errStr,
const char *func)
     if (options->debug)
          mtaLog("%s() reported: %s",
               (func ? func : "?"), errStr);
* error_exit() -- Exit with an error status and error message.
static void error_exit(int ires, const char *msg)
     mtaLog("%s%s%s", (msg ? msg : ""), (msg ? "; " : ""),
     mtaStrError(ires,0));
     exit(1);
msgsr_clamav.cnf
DEBUG=1
BAD_MIME_TYPES=application/vbscript
BAD_FILE_TYPES=bat,pif,vb,vbs,chs,exe************************************************
broken message
Return-path: <[email protected]>
Received: from virusscan-daemon.apple.california.com by apple.california.com
(Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005))
id <[email protected]> for [email protected]; Thu,
20 Apr 2006 07:30:13 -0700 (PDT)
Received: from california.com ([209.159.129.16])
by apple.california.com (Sun Java System Messaging Server 6.2-3.04 (built Jul
15 2005)) with ESMTP id <[email protected]> for
[email protected]; Thu, 20 Apr 2006 07:30:05 -0700 (PDT)
Received: from [61.23.221.222] by apple.california.com (mshttpd); Thu,
20 Apr 2006 14:30:05 +0000 (GMT)
Content-return: allowed
Date: Thu, 20 Apr 2006 14:30:05 +0000 (GMT)
From: [email protected]
Subject: Re: testing
In-reply-to: <[email protected]>
To: [email protected]
Message-id: <[email protected]>
MIME-version: 1.0
X-Mailer: Sun Java(tm) System Messenger Express 6.2-3.04 (built Jul 15 2005)
Content-type: multipart/alternative;
boundary="Boundary_(ID_iOVR4MBjhWJn/mh7Ij+BUQ)"
Content-language: en
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Priority: normal
References: <[email protected]>
Original-recipient: rfc822;[email protected]
This is a multi-part message in MIME format.
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Ok, so it's not my code. Using the virus_scanner_simple.c example from SUN, if you change the decode_inspect routine to return MTA_OK for every call (which should technically just let the message pass) it has the same behavior as my program. (Not all that suprising since mine is a derivative of said program)
That said, this now looks like a library issue. I'm using Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005) according to the SMTP prompt, and was wondering if perhaps I should apply:
http://sunsolve.sun.com/search/document.do?assetkey=1-21-118207-42-1&searchclause=6306404
The issue seems to be in the mtaDecodeMessage function, and occurs when the decode_inspect function is allowed to parse the message body, not just the message headers.
The machine is a Sun Ultra 4500 running Solaris 10. Here's the banner:
SunOS cookie 5.10 Generic_118822-23 sun4u sparc SUNW,Ultra-Enterprise
Has anyone else had similar problems using the MTA SDK? Is there anything I'm missing here (besides the above mentioned patch) that might fix this?

How to create a filter using mathscript transfer function in labview

Dear all,
I am currently designing a filter in labview using a Mathscript looping. The filter can be represented in transfer function. I have attachted the transfer function equation together with its value and the desire frequency vs. amplitude graph that I should obtained from it. Also, following are the transfer function written in Matlab.
B1= tf ([57.5221845],[1 51.017077 205.1868]);
B2 = tf ([1 0],[7.6991]);
B3 = tf ([1 0],[14.32433403]);
B4 = tf ([1 0],[137.6017]);
F = B1 * ( (1+B3)/((1+B2)*(1+B4)));
plot(F)
I have also modify the coding as Labview Mathscript does not support the Matlab coding "tf" as transfer function to "bilinear"
Problem I am facing are:
1) Unable to display the graph of the filter in labvie.
2) Unable to have sinewave as an input to the filter.
3) The output cannot be display in graph format.
Hope to have the soonest reply from you guys. Many thanks in advance
Solved!
Go to Solution.
Attachments:
transfer function.jpg ‏18 KB
Weighting Filter.vi ‏266 KB

Thank you again for offering to help me in writing the code.
I suppose that I should do a frequency sweep on the transfer
function to prove that it behave as the sample graph. Example, if I have an input sine
wave with the frequency of 8.8Hz passing through the transfer function filter, the
output that I should be getting is 1 according to the transfer function graph
and of cause the frequency range of my input sine wave would only be between
the ranges of 0.5 Hz to 30 Hz.
Attachments:
Weighting FilterTest1.vi ‏53 KB

How to implement a psophometric filter in Labview software without uising Sound and vibration toolkit?

Someone know the method to implement a psophometric or weighted filter in Labview software Without using Sound and Vibration Toolkit?
Thanks

The simplest way to implement a psophometric filter is to use the Sound and Vibration toolkit.
Anyway if you don't want to purchase it, you can have a look at this forum discussion and this one.
Serena Monti
Applications Engineer
National Instruments

SINAD Measurement with CCITT Filter

Hi,
I am doing some audio measurements (SINAD) with the NI 4461 Data Aq Card and using LabView to make the measurement. Normally the measurement is done with a Agilent 8903 Audio Analyzer which is obsolete and we are now using the NI 4461 card as a replacement in newer test stations. I am trying to correlate the measurement to a 8903B and I am 3 dB different between the NI 4461 card (SINAD=13dB) and the 8903B (SINAD=16dB).
I am using the CCITT weighting filter and a 30KHZ low pass filter in LabView which is what I have set on the 8903B Analyzer. Do you know of anyone familiar with using the tool kit or maybe anyone who has modeled a 8903 in LabView?
Thanks,

Hi,
Thanks for the reply and appreciate any help you can give as I am very stuck.
I am using LabView 8.2 with SVT version 4.0. Attached is my VI and I am comparing my reading to a 8903B Audio Analyzer with the CCITT filter and the 30KHz low pass filters switched on.
Thanks,
Julie
Attachments:
CCITT Audio.vi ‏430 KB

Sound pressure spectra with SVT

Hey all,
I have a project which I have been having a bit of trouble implementing. I'm performing several measurements at 48kHz/24Bit of some sound events. My requirement are as follows for sound pressure spectra analysis.
500 - 20 kHz frequency bandwidth with a 25 Hz frequency resolution.
Peak Hold averaging with 50% overlap processing and Hanning windowing applied to the time records.
Anti-aliasing filtering.
A - weighting.
I have the sound and vibration toolkit and have implemented as follows:
1. Read wav
2. Convert from Volts to dB via SVL Scale Volts to EU.vi. (I used a calibrated signal of 94dB at 1kHz to find my mic sensitivity).
3. A-weighting using SVL A,B,C Weighting Filter.vi
4. Peform analysis using SVL Zoom Power Spectrum.vi.
Few Issues:
I dont know how to implement the Anti-aliasing filter.
Is the method I have used ok with measuring sound spectra? Or should I perform the FFT then convert to dB?
I have tried to implement the same analysis using Matlab and although I get the same FFT profile, my dB levels are different where the 16kHz noise is almost the same level as the 8kHz noise? Not sure what is happening there, but I want to concentrate on using LV for now.
I dont have any guidance available or experience with this sort of analysis. I have trialed my program out on a sample wav file which has two separate distinct noises events, one at 8kHz and another at 16kHz. My FFT is showing that the 16kHz is a much higher sound level (95dB) than the 8kHz (80dB) but when I listen to the wav via a pair of studio monitor speakers, the 8kHz is much more audible. Wouldn't the implementation of A-weighting filter tend to make the 8kHz noise more prevalent in the FFT?
Any suggestions on this topic are appreciated.
Thanks!

Hi David,
If you want to enable the enhanced alias filter, you can use a DAQmx channel property node. I would recommend placing a DAQmx Channel property node on the block diagram and then going to Analog Input » General Properties » Advanced » Enhanced Alias Rejection Enable. See if that works and let me know.
Jake H | Applications Engineer | National Instruments
Attachments:
Enhanced Alias Rejection.png ‏3 KB

Diagram or vi for Sound Pressure Level Meter (SPL)

Need help for implementing a Sound Pressure Level Meter (SPL) with LabVIEW 7.1 or 6.3....I must use a microfone and a laptop for my project.....Need diagram or ready vi ....!!!
How can I make an A,B,C Weighting Filter vi for my Sound Pressure Level Meter project....???
If there is one already made or you can give me any help please send it to me.......[email protected]
Thanks.....

Search the archives. A similar question about the weighting filters was posted within the past month or two, if I recall correctly. I am not aware of any ready-built VIs, but the filter specs are published (Google A-weighting).
Also be careful with the frequency response of inexpensive microphones. They can skew the results substantially if you do not have some way to measure and compenste for the response.
Lynn

Vibration octave analysis problem

I'm measuring a vibration in range of 1-80Hz, according to Iso 2631.
The problem is that I need the velocity information for each 1/3-octave bands. It should be expressed in mm/s. If fractional octave analysis is used it always ends up to psd unit (mm/s)^2. Using some basic fft-analysis the unit is correct (mm/s) but resolution is higher than 1/3 octave. Any ideas?
ps. Is there any plans to develop a weighting filter needed by Iso 2631-2?

Human vibration filters were added to the Sound and Vibration Measurement Suite in version 6.0 at the end of 2007 compliant to ISO 2631 and ISO 5439.

Any equalizer program in LabVIEW SVT which can control the dBPa under 1/3 octave frequency band?

Could we adjust the dBPa of a wav file by equalizer and then save the dBPa modified file to the other wav file for play? The equalizer should be controlled under 1/3 octave frequency band.

Taipo,
If you import the .wav file into LabVIEW and convert it to the waveform data type, you could use the SVT to do third-octave analysis on the waveform and then use the SVT Weighting Filter VI to adjust the level of different octaves in the signal.
If you are looking for a pre-made equalizer example for a .wav file in LabVIEW, we do not have an example that does that at this time. However, there are many programs available on the internet that can equalize a .wav file.
Sincerely,
Ross C
Applications Engineer
National Instruments

Envelope acceleration measurement

hello dear all
i am having problem regarding vibration analysis in which i have to
measure the envelope acceleration. i am using the weighting filter but
i have certain lack of knoledge regarding envelope filter which is used
in the envelope measurement. if i have to used bandpass filter
range as follow
1----   300 - 6k         CPM
2----   3k - 60k      CPM
3----   30k - 600k    CPM
4----   300k - 2.4M   CPM
if i have to used weighting fileter in sound and vibration
toolkit,Then can anybody help me to make vi that can measure my
envelope measurement within this band pass filter ragne.
my email address is [email protected]
thanking you
keyur

Keyur,
You may want to check out the following links:
http://zone.ni.com/devzone/cda/tut/p/id/1369
http://zone.ni.com/devzone/cda/tut/p/id/1469
http://zone.ni.com/devzone/cda/tut/p/id/4129
Abhinav T.
Applications Engineer
National Instruments

ISO Human exposure vibration analysis

Good Morning,
I am trying to use LabView 7.1 with the Sound and Vibration toolkit in processing some data in accordance with ISO 5349-1:2001. In this standard, data needs to be collected in 1/3 octave bands from 6.3Hz to 1250Hz then weighted and the RMS taken. Data collection and RMS are not a problem, the challenge I am having is with the octave analysis and creating the custom weighting. Am I just missing the obvious VI's in SVT 3.1? Is there a custom weighting example? How does one perform octave analysis below the low frequency cut-offs of the existing VI's?
Thanks,
DRK

Hi DRK,
thanks for posting again. A few things:
1) In the same user manual on pages 9-9 and 9-10 there's this info:
Performing Third-Octave Analysis Outside the Audio Range
You might need to perform third-octave analysis on signals outside of the
20 Hz–20 kHz range. For example, you might need to evaluate human
exposure to whole body vibration with potential signals of interest in
the 0.5 Hz–80 Hz range. To perform third-octave analysis outside the
20 Hz–20 kHz range, use either the SVT Fractional-octave Analysis
[ANSI] VI or the SVT Fractional-octave Analysis [IEC] VI and select a
bandwidth equal to 1/3 octave, as illustrated in Figure 9-7.
2)We don't have a weighting filter according to that standard currently but we would like to discuss the standard a little more with you, if possible. Can you give us a phone number (preferably) or an email address that we can contact you at?
Thanks!
Brian Spears

Format of Filter view

Hi all,
How to change format of filter view in answers? How to remove border line of filter? I have looked in views.css and format of filter is set as
.FilterFirstTable
.FilterTable
border: solid 1px #CCCCCC;
.FilterCell
font-size: 8pt;
border: 0px;
text-align: left;
padding: 2px 4px;
.FilterValueSpan
font-weight: bold;
.FilterOpCell
font-size: 8pt;
font-weight: bold;
vertical-align: top;
top: -6pt;
padding: 2px 0px 2px 4px;
And problem is that I have border line. But when I log on VMWare on samplesales repository the same format is there. But there is no borderline on filter view.
Thanks

Changing the ini files should change the date format. Have you amended the correct instances of the date format? In dbFeatures there is one for every ODBC connection.
For example in my DBFeatures.INI
[ DATA_SOURCE_FEATURE = ODBC_300 ]
DATE_FORMAT = 'dd-mm-yyyy' ;
     TIME_FORMAT = 'hh:mi:ss' ;
     DATE_TIME_FORMAT = 'dd-mm-yyyy hh:mi:ss' ;
     IDENTIFIER_QUOTE_CHAR = '"';Also a file on the presentation side in OracleBI \web\Config called localedefinitions.xml.
Inside that there appears to be defaults for localisations - maybe it is possible to amend your locale in the Administration settings of the dashboard.
However, I haven't tried this sorry.

A,B,C Weighting Filter vi

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