D/A Distortion Compensator

[poynton]

Hello All.

I have a Kenwood DP-1100SG cd player which sounds great, no doubt helped by many items as standard eg twin Transformers, multiple regulators, separate digital / analog boards, cast alloy cdm, etc.

One thing it has is a 'D/A Distortion Compensator' chip, TC17G005AF-0048.

It sits between the digital filter, SM5804D, and the D/A chips, PCM54P-K, with an output feeding the I/V converter for nulling distortion at 1KHz -20dB and 100Hz 0dB.

It looks as though it may reclock the I2S lines.

I have been unable to find any info on this chip.



Can anyone help??


Andy

 

[andrew_whitham]

glitch = distortion?

Could that be related to the de-glitcher? (pg 7 of the PCM54 datasheet) maybe its a method of achieving that...

Marketing?

Who's the manufacturer of that chip? the TC17G005AF-0048?

 

[poynton]

Re: glitch = distortion?

Could that be related to the de-glitcher? (pg 7 of the PCM54 datasheet) maybe its a method of achieving that...

I don't think so. It uses 2 PCM54 so a deglitcher would not be required.

Who's the manufacturer of that chip? the TC17G005AF-0048?

I don't know !

Andy

 

[poynton]

CHIP

 

[rfbrw]

It is a Toshiba gate-array. Half way between a custom ASIC and a FPGA.

 

[poynton]

It is a Toshiba gate-array. Half way between a custom ASIC and a FPGA.

OK but how doe's it work?

Andy

 

[rfbrw]

Can't tell what it does from that schematic. The dacs, though, are far too small to be PCM54's. Not nearly enough pins. Pretty sure the text says PCM56.

 

[poynton]

Can't tell what it does from that schematic. The dacs, though, are far too small to be PCM54's. Not nearly enough pins. Pretty sure the text says PCM56.

OOPS!

Yes, they are PCM56K

Andy

 

[davidsrsb]

This sounds like another attempt at adding a small digital dither signal to the D/A inputs and then subtracting the same signal in analog form at the I/V covertor.

It should work.