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K Seshu Babu- If you look at section 12.4.1, Companding Internal Data, in TMS320C6000 Peripherals (SPRU190D) you will see that what Chen is recommending will not work with the AD535 codec directly. You will have to use a second McBSP port to compress 16-bit data to u-Law. Do this: -read 16-bit data from AD535 on McBSP0 -compress on McBSP1 using DLB mode (internal loopback), with XCOMPAND and RCOMPAND set same Then you have 8-bit u-Law data for processing. If McBSP1 is needed for other peripheral, then you're stuck using a software function. Jeff Brower DSP sw/hw engineer Signalogic -------- Original Message -------- Subject: Re: [c6x] 64kbps PCM Date: Fri, 25 Oct 2002 23:03:53 -0500 From: Jeff Brower <> Organization: Signalogic To: ZW Chen < wrote: > > ÔÚÄúµÄÀ´ÐÅÖÐÔø¾­Ìáµ½: > >From:Jeff Brower <> > >Reply-To: > >To: K Seshu Babu <> > >Subject: Re: [c6x] 64kbps PCM > > > >K Seshu Babu- > > > >> With DSK6711(16-bit codec) can we convert 16-bit PCM to > >> 8-bit.Is their any method to do it without harming sample value too much > > > >Try u-Law, standard telephony method to compress samples to 8-bit. I don't think > the > >feature is built into the AD535 codec on the DSK board, so you might try simple > >software formula. > > no,Brower, 6711 McBsp has that function,i can convert linear sample to u-law or > A-law automatically Yes the McBSP has many great features. Next time, please help K Seshu Babu or other person who needs the help! Thanks. Jeff Brower DSP sw/hw engineer Signalogic

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