Re: [Discuss-gnuradio] Receiver : acoustic modem

[Alexandru Csete]

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

Alex