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...h a 8 bit sample, am I right to say that I will not have the "big/little endian" issue? What has gone wrong??? Regards, Carine ----- Original Message ---- From: Jean-Marc Valin <jean-marc.valin@usherbrooke.ca> To: Carine Liang <carineliang@yahoo.com.sg> Cc: John Miles <jmiles@pop.net>; speex-dev@xiph.org Sent: Monday, 25 December 2006 10:22:44 AM Subject: Re: [Speex-dev] Integrating speex with VideoNet application: Constantbackground noise Have you tried starting with sampleenc/sampledec instead of doing everything from scratch. That and the manual should contain ev...

...39;s side and play the voice. My application works fine without the codec but I need to achieve a lower data rate. Anyone has done that before? Is there anyone who's deal with encoding and decoding PCM samples in windows? Please help. Carine ----- Original Message ---- From: John Miles <jmiles@pop.net> To: Carine Liang <carineliang@yahoo.com.sg>; speex-dev@xiph.org Sent: Friday, 3 November 2006 12:32:43 AM Subject: RE: [Speex-dev] Integrating speex with VideoNet application: Constantbackground noise DIV { MARGIN:0px;} Yes, it's necessary; Speex will encode signed 16...

...h, maybe not paying enough attention to the manual and the sample code? Jean-Marc > > Regards, Carine > > > ----- Original Message ---- From: Jean-Marc Valin > <jean-marc.valin@usherbrooke.ca> To: Carine Liang > <carineliang@yahoo.com.sg> Cc: John Miles <jmiles@pop.net>; > speex-dev@xiph.org Sent: Monday, 25 December 2006 10:22:44 AM > Subject: Re: [Speex-dev] Integrating speex with VideoNet application: > Constantbackground noise > > Have you tried starting with sampleenc/sampledec instead of doing > everything from scratch. That...

...he values of the original PCM samples. For cases when the PCM sample values are constant (because no one is speaking), the decoded values fluctuate too. These fluatuations are causing the background noise. Is my observation expected? Thanks, Carine ----- Original Message ---- From: John Miles <jmiles@pop.net> To: Carine Liang <carineliang@yahoo.com.sg>; speex-dev@xiph.org Sent: Monday, 6 November 2006 11:52:53 AM Subject: RE: [Speex-dev] Integrating speex with VideoNet application: Constantbackground noise DIV { MARGIN:0px;} It could be a million different things, unfortunatel...

...ged my array from char to short and I'm still getting the same constant background noise. I notice that when I talk into the mike, I will get a slightly louder noise, can't hear any clear speech... Any idea what's wrong? Regards, Carine ----- Original Message ---- From: John Miles <jmiles@pop.net> To: Carine Liang <carineliang@yahoo.com.sg>; speex-dev@xiph.org Sent: Friday, 3 November 2006 12:32:43 AM Subject: RE: [Speex-dev] Integrating speex with VideoNet application: Constantbackground noise DIV { MARGIN:0px;} Yes, it's necessary; Speex will encode signed 16...

...for your reply. Yes, my output device is in 8-bit mode, same as my input mode. I'm actually working in char (8 bit) arrays. Is it necessary to work in signed short integers only? I changed all the short arrays in the example to char. Carine ----- Original Message ---- From: John Miles <jmiles@pop.net> To: carineliang@yahoo.com.sg; speex-dev@xiph.org Sent: Thursday, 2 November 2006 2:04:39 PM Subject: RE: [Speex-dev] Integrating speex with VideoNet application: Constantbackground noise DIV { MARGIN:0px;} At first glance it looks like you are opening the output device in 8-bit...

I'm not sure, but I think that Microsoft have the license now.. anyone know if there is the source code to download? Or others codecs.. thank you very much ---------- Original Message ---------------------------------- From: "John Miles" <jmiles@pop.net> Date: Mon, 19 Jun 2006 10:15:59 -0700 >Do a search on "Voxware MetaVoice". I'm not sure who licenses the >underlying technology these days (it's not Voxware anymore), but they do >have solutions that work in the 1200-2900 bps range. > >-- john > &g...

...of the original PCM samples. For cases when the PCM sample values are constant (because no one is speaking), the decoded values fluctuate too. These fluatuations are causing the background noise. Is my observation expected? Thanks, Carine ----- Original Message ---- From: John Miles <jmiles@pop.net> To: Carine Liang <carineliang@yahoo.com.sg>; speex-dev@xiph.org Sent: Monday, 6 November 2006 11:52:53 AM Subject: RE: [Speex-dev] Integrating speex with VideoNet application: Constantbackground noise It could be a million different things, unfortunately. Focus on compa...

Hi, I am capturing 16 bit mono sound samples using some Win32 API function calls. These function calls return the sound samples in an array of characters. My assumption is that this array of characters represents pairs of bytes that make up a short integer. I'm using the following code to convert the samples: LPTSTR *lpSaveBuffer; ...... for(j=0;j<nBytes;++J) { BYTE a =

Thanks for the answer. So data are stored in little-endian format on the WAVE file. But have I to encode in big endian format or little endian is ok?! Thanks ---------- Original Message ---------------------------------- From: "John Miles" <jmiles@pop.net> Date: Tue, 23 May 2006 12:15:05 -0700 >You are probably reading little-endian samples on a big-endian platform, and >failing to flip the byte order. By convention, PCM samples are generally >little-endian words, and the effect of playing them with the wrong byte >order is...

I noticed my latency is gradually increasing in my audio loopback test application. I just hear what i say, encoding and decoding on the fly. I suppose 8000 Hz for the output device is not 8000 Hz for the input one, they differs since they could refer to different time generators (i suppose...). To solve the problem i rised the output sampling rate from 8000 to 8200 Hz, and now i'm not

I have a video conference like application that I've been working on for a while now, and a recent change is causing some odd problems, and I was wondering if anyone else had seen problems like this. The issue I'm seeing is that when using the sound card for capture, the audio will eventually get about 1-2 seconds out of synch (delayed), from the video. However, if I use USB devices

Is "nBytes" what it says -- the number of bytes in the buffer? If so, you're overshooting the buffer by 2x by multiplying by 2 in your array access. You probably want a variable called "nSamples" that represents the number of 16-bit words. Also, if this is a little-endian (Windows on x86?) machine, you're reassembling the word backwards. Not to mention, shifting a

It is a good idea not to use sample rates other than 44100 or 48000 Hz for your final audio I/O. The chipset people just do not give a crap about rates other than that. They don't see a problem with giving you 11100 Hz when you ask for 11025, for instance, even though that's a huge problem for VoIP. Ultimately you need to be prepared to resample to one of the de-facto 'standard'

> -----Original Message----- > From: speex-dev-bounces@xiph.org [mailto:speex-dev-bounces@xiph.org]On > Behalf Of James Stanton > Sent: Thursday, October 04, 2007 12:53 PM > To: speex-dev@xiph.org > Subject: [Speex-dev] Audio Speed Variability > > > I have a video conference like application that I've been working on for > a while now, and a recent change is

I don't know about the input side; I have personally only experienced being bitten by the output resampler. But it seems like a safe assumption that yes, the input side is equally broken. Any resampling code found on the 'net should be suitable as long as it sounds good, doesn't take too much CPU, and is compatible with your product's licensing/distribution terms. There are

...xenc.exe tend to contain wild amplitude-level variations, tonal artifacts, and clipped regions. Here's a good example of what I'm talking about: speexenc --bitrate 7500 pcm16k.wav speex.spx speexdec speex.spx recovered.wav If you run these commands with the file http://www.speakeasy.net/~jmiles1/pcm16k.wav in 1.0.4, the recovered.wav output doesn't sound too bad. Under 1.1.11, the recovered audio sounds terrible by comparison. So: what are peoples' thoughts on the best version of Speex to use in production code? Should I incorporate the current stable 1.0.5 source tree into my...

What's wrong with a plain old .bat file, or even an NMAKE .mak file? Ship two files, debug.bat and release.bat, and call it good. It is best to leave project-file creation up to individual users, in my opinion. MS changes their IDEs and project-file formats more often than most people change their underwear. The odds that any given open-source project will actually compile without any