D/A Distortion Compensator

poynton · 11th April 2006, 01:40 PM

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 · 11th April 2006, 02:26 PM

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 · 11th April 2006, 03:35 PM

Quote:

Originally posted by andrew_whitham
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.

Quote:

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

I don't know !

Andy

poynton · 11th April 2006, 03:39 PM

CHIP

rfbrw · 11th April 2006, 04:18 PM

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

poynton · 11th April 2006, 04:45 PM

Quote:

Originally posted by rfbrw
It is a Toshiba gate-array. Half way between a custom ASIC and a FPGA.

OK but how doe's it work?

Andy

rfbrw · 11th April 2006, 05:03 PM

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 · 11th April 2006, 05:11 PM

Quote:

Originally posted by 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.

OOPS!

Yes, they are PCM56K

Andy

davidsrsb · 11th April 2006, 05:18 PM

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.

11th April 2006, 01:40 PM	#1
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	D/A Distortion Compensator 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

11th April 2006, 02:26 PM	#2
andrew_whitham diyAudio Member Join Date: Oct 2005	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?

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11th April 2006, 04:18 PM	#5
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	It is a Toshiba gate-array. Half way between a custom ASIC and a FPGA.

11th April 2006, 05:03 PM	#7
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	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.

11th April 2006, 05:18 PM	#9
davidsrsb diyAudio Member Join Date: Dec 2005 Location: Kuala Lumpur	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.

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