[Speex-dev] Integrating speex with VideoNet application: Constantbackground noise

[Jean-Marc Valin]

> Thanks. I've got the code for sampleenc and sampledec. But I didn't
> know how to verify whether the decoded file is correct. So I tried to
> analyse the decoded output and compile with my input.

How about actually listening to the output first?

> Test case: PCM samples, 8 bit, 8000 samples per sec. When I pulled

Where in the manual does it say that 8-bit PCM is a valid input?

[...]

> Is my decoded output expected? 

Yes. Based on the "garbage in, garbage out" principle.

> Since I'm dealing with a 8 bit sample,
> am I right to say that I will not have the "big/little endian" issue?

No, just the "not the right type in the first place" issue.

> What has gone wrong???

Euh, 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 at usherbrooke.ca> To: Carine Liang
> <carineliang at yahoo.com.sg> Cc: John Miles <jmiles at pop.net>;
> speex-dev at 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
> everything that's needed.
> 
> Jean-Marc
> 
> Carine Liang a écrit :
>> Hi,
>> 
>> 
>> 
>> I'm still unable to get rid of the background noise though I've 
>> changed the PCM samples to 16 bit. I'm began to wonder if I can
>> just take the PCM samples and encode them.
>> 
>> What my application tries to do is to record the voice from a 
>> microphone, encode it, send it via the socket to a peer, decode at 
>> the peer'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 at pop.net> To: 
>> Carine Liang <carineliang at yahoo.com.sg>; speex-dev at 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-bit PCM data and 
>> decode to the same format.  See the examples that come with it.
>> 
>> 
>> 
>> 8-bit audio is not something you would ever want to use.
>> 
>> 
>> 
>> 
>> 
>> ------------------------------------------------------------------------
>> 
>> 
>> 
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> 
> 
> 
> 
> 
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