Comments by "eDoc2020" (@eDoc2020) on "Computerphile" channel.

Or don't interpolate on the time axis. Instead of stretching each sample 9 times to reach 48000Hz sampling just output a WAV file with 5333Hz sampling. Then all the interpolation needed for playback is done by the audio software. Audio files with crazy weird sample rates still play back fine on modern systems.
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@elclippo4182 As played back the sample rate is 5333 Hz (it was output as 48kHz after a stretch factor of 9). In terms of bit depth it's better than 8 bits assuming the screenshot was more than 256px tall.
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