piclist 2008\07\20\085447a >
Thread: Digital Sound
www.piclist.com/techref/microchip/ios.htm?key=sound
face picon face BY : Jinx email (remove spam text)



> 64Kbit/s CVSD actually sounds pretty good

I've uploaded some files. Server keeps timing out when trying to upload
the 44.1kHz stereo original for comaprison (what an odd typo), might try
later

TMS3478 output

http://home.clear.net.nz/pages/joecolquitt/sarasate_32kbps_CVSD_mono.mp3

how the waves actually look

http://home.clear.net.nz/pages/joecolquitt/sarasate_waves.gif

data coming out of the 4C1024 DRAM

http://home.clear.net.nz/pages/joecolquitt/Playback.gif

I use these circuits with RAM or EPROM, a 16F84 supervising

Copies DRAM to SRAM to PC

http://home.clear.net.nz/pages/joecolquitt/shrecorder2.gif

Downloads from PC to SRAM

http://home.clear.net.nz/pages/joecolquitt/shplayer1.gif

If a recording of 0V is made, which makes a stream of 01010101, data
bits are seen more clearly to be about 12us wide

If this were to be done on a PIC, with perhaps SRAM, I might look at
a DAC like the MCP4921. 20MHz SPI and 4us settling time. What I
don't know much about yet are Estimate and Syllabic Integrators

=============================

If anyone's interested, the sample is from Sarasate's Carmen Fantasy,
played by Sarah Chang (vln) with the Berlin Philharmonic. Just fizzes
along

<020201c8ea67$83d00bc0$89aafea9@ivp1> 7bit

See also: www.piclist.com/techref/microchip/ios.htm?key=sound
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