Hi I have to design an audio system where DM6467 McASP is the Master (Providing frame sync and data) to a passive, oversampled DAC(CS4353, Cirrus Logic). The serial clock is provided by CDCE949. McASP frame sync (for Tx) depends on 1) Serial Clock (SCLK) 2) No of slots/Frame 3) Slot size. 2 & 3 can be programmed thru McASP registers, and serial clock is fixed. Currently SCLK =256KHz, no of slots=2 (I2S), slot size= 32 bits. In this case frame Sync is 4 KHz. Surprisingly, the DAC gives output for a stream originally sampled at 8 KHz, 16 bit/Sample. When I increase the frame sync to 8 KHz, by making slot size=16, the play back is not normal (plays at double speed). Why is it so? I get some noise with the audio , when the frame sync is at 4 KHz. How, in an audio system based on DM6467 , similar to the above , can support streams with multiple sampling rates? Is there any problem with the DAC I am using? How DM6467-AIC33 combination is able support various sample rates?
Regards JK Jayakrishnan M M Research Engineer R&D Team-2 , Group-5 Security Solutions Division SAMSUNG TECHWIN CO.,LTD TEL +82-70-7147-8482 FAX +82-31-8018-3712 Mobile +82-10-6409-3619 E-mail:[email protected] _______________________________________________ Davinci-linux-open-source mailing list [email protected] http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
