Audio quality tests

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32kHz sample rate

Using MDFourier 1.07d (15-12-2021) with this reference file.

The 32kHz sample rate is most commonly used by licensed software. It is upsampled to 48kHz in hardware prior to final output.

A 15kHz white screen was displayed to induce audible noise.

ASUS PRIME X570-PRO

Using ALC1220 (S1220A).

This device serve as our reference.

Source Difference Noise floor Time spectrogram
Nintendo Stereo AV Cable
DOL-CPU-11 		File:DA ALL AVG mdfourier-dac-48000 vs Nintendo Stereo AV Cajyg.png File:NF SP B Nintendo Stereo AV Caxwc -1Silence.png
Nintendo Stereo AV Cable
DOL-CPU(P)-10 		File:DA ALL AVG mdfourier-dac-48000 vs Nintendo Stereo AV Caxiq.png File:NF SP B Nintendo Stereo AV Caulg -1Silence.png
Generic S-Video Cable
DOL-CPU-11 		File:DA ALL AVG mdfourier-dac-48000 vs Generic S-Video Cabletom.png File:NF SP B Generic S-Video Cablegwa -1Silence.png
HD Retrovision SNES Component Cable
DOL-CPU(P)-10 		File:DA ALL AVG mdfourier-dac-48000 vs HD Retrovision SNES Cejl.png File:NF SP B HD Retrovision SNES Cila -1Silence.png
Bitfunx GameCube Component Cable File:DA ALL AVG mdfourier-dac-48000 vs Bitfunx GameCube Compbfo.png File:NF SP B Bitfunx GameCube Compbxh -1Silence.png
GCVideo-DVI v3.1 + Portta HDMI to YPbPr Converter File:DA ALL AVG mdfourier-dac-48000 vs GCVideo-DVI v3.1 + Posqz.png File:NF SP B GCVideo-DVI v3.1 + Powym -1Silence.png
GCVideo-DVI v3.1 + Portta HDMI to YPbPr Converter
Sample Rate Hack[1] 		File:DA ALL AVG mdfourier-dac-48000 vs GCVideo-DVI v3.1 + Poeoo.png File:NF SP B GCVideo-DVI v3.1 + Popdf -1Silence.png
  1. ↑ https://github.com/ikorb/gcvideo/blob/main/Firmware/README.md#advanced-settings

Hauppauge WinTV-HVR-1850

Using CX23888.

Source Difference Noise floor Time spectrogram
Nintendo RF Modulator
DOL-CPU-11 		File:DA ALL AVG mdfourier-dac-48000 vs Nintendo RF Modulatorqxl.png File:NF SP B Nintendo RF Modulatorvhh -1Silence.png
Nintendo Stereo AV Cable
DOL-CPU-11 		File:DA ALL AVG mdfourier-dac-48000 vs Nintendo Stereo AV Cafwu.png File:NF SP B Nintendo Stereo AV Carkb -1Silence.png
Generic S-Video Cable
DOL-CPU-11 		File:DA ALL AVG mdfourier-dac-48000 vs Generic S-Video Cableczp.png File:NF SP B Generic S-Video Cablefmb -1Silence.png

48kHz sample rate

Using MDFourier 1.07d (15-12-2021) with this reference file.

The nominal sample rate is 54MHz÷1124, rather than 54MHz÷1125. This is reflected in the frame duration of the standard equipment test.
The 48kHz sample rate is most commonly used by homebrew software and streaming audio in licensed software.

A 15kHz white screen was displayed to induce audible noise.

ASUS PRIME X570-PRO

Using ALC1220 (S1220A).

This device serve as our reference.

Source Difference Noise floor Time spectrogram
Nintendo Stereo AV Cable
DOL-CPU-11 		File:DA ALL AVG mdfourier-dac-48000 vs Nintendo Stereo AV Cadrx.png File:NF SP B Nintendo Stereo AV Caswr -1Silence.png
Nintendo Stereo AV Cable
DOL-CPU(P)-10 		File:DA ALL AVG mdfourier-dac-48000 vs Nintendo Stereo AV Camlz.png File:NF SP B Nintendo Stereo AV Cavpk -1Silence.png
Generic S-Video Cable
DOL-CPU-11 		File:DA ALL AVG mdfourier-dac-48000 vs Generic S-Video Cablehvi.png File:NF SP B Generic S-Video Cableucu -1Silence.png
HD Retrovision SNES Component Cable
DOL-CPU(P)-10 		File:DA ALL AVG mdfourier-dac-48000 vs HD Retrovision SNES Cyvn.png File:NF SP B HD Retrovision SNES Clxg -1Silence.png
Bitfunx GameCube Component Cable File:DA ALL AVG mdfourier-dac-48000 vs Bitfunx GameCube Compyeg.png File:NF SP B Bitfunx GameCube Compqpd -1Silence.png
GCVideo-DVI v3.1 + Portta HDMI to YPbPr Converter File:DA ALL AVG mdfourier-dac-48000 vs GCVideo-DVI v3.1 + Povjc.png File:NF SP B GCVideo-DVI v3.1 + Ponzs -1Silence.png
GCVideo-DVI v3.1 + Portta HDMI to YPbPr Converter
Sample Rate Hack[1] 		File:DA ALL AVG mdfourier-dac-48000 vs GCVideo-DVI v3.1 + Pocsl.png File:NF SP B GCVideo-DVI v3.1 + Ponie -1Silence.png
  1. ↑ https://github.com/ikorb/gcvideo/blob/main/Firmware/README.md#advanced-settings

Hauppauge WinTV-HVR-1850

Using CX23888.

Source Difference Noise floor Time spectrogram
Nintendo RF Modulator
DOL-CPU-11 		File:DA ALL AVG mdfourier-dac-48000 vs Nintendo RF Modulatorrzn.png File:NF SP B Nintendo RF Modulatorvse -1Silence.png
Nintendo Stereo AV Cable
DOL-CPU-11 		File:DA ALL AVG mdfourier-dac-48000 vs Nintendo Stereo AV Caifm.png File:NF SP B Nintendo Stereo AV Cairq -1Silence.png
Generic S-Video Cable
DOL-CPU-11 		File:DA ALL AVG mdfourier-dac-48000 vs Generic S-Video Cablebib.png File:NF SP B Generic S-Video Cablelgk -1Silence.png
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