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Re: [Discuss-gnuradio] Receiver : acoustic modem

From: Alexandru Csete
Subject: Re: [Discuss-gnuradio] Receiver : acoustic modem
Date: Fri, 16 Jul 2010 01:37:50 +0200

On 16 July 2010 00:51, Raman O <address@hidden> wrote:
> hello ,
>    I have implemented receiver for detecting and decoding data frame based 
> FHSS. At the moment, I am feeding Rx with recorded wav file and it works fine.
> The problem is when i want to do online decoding by replacing wav source with 
> alsa source, I see nothing happening beyond frame sync.
> if anyone has implemented modem based on acoustic , please guide me.

Could it be that your wav file has integer samples with range 0..32768
(or signed)? The samples from the audio input are float between -1.0
and +1.0


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