Where has this sound card been all my life? I think I'm tearing up.

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Reply 20 of 21, by squareguy

Posted on 2016-09-25, 21:27

squareguy Offline

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Rank: Oldbie
Posts: 887
Joined: 2013-09-22, 14:14
Location: USA

I dug up another ES1688 card that differs from the one I have and I will play with it too. I have a few ideas for mods that I would like to try out. I wonder if the noise is the ES1688 chip or its implementation / lack of filtering.

Gateway 2000 Case and 200-Watt PSU
Intel SE440BX-2 Motherboard
Intel Pentium III 450 CPU
Micron 384MB SDRAM (3x128)
Compaq Voodoo3 3500 TV Graphics Card
Turtle Beach Santa Cruz Sound Card
Western Digital 7200-RPM, 8MB-Cache, 160GB Hard Drive
Windows 98 SE

Reply 21 of 21, by James-F

Posted on 2016-09-26, 06:03

James-F Offline

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Posts: 1505
Joined: 2015-11-30, 04:10

I think the noise from the MPU-401 implementation is generated in the ES1688 chip itself.
The problem here is that this noise appears in the PCM/Voice signal path not in the Wavetable audio return, which is why I believe the source for it is in the chip itself.
Disabling the MPU-401 will eliminate the noise.

I know the Yamaha YMF71x card is completely silent with the Doom audio test.

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