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The Nielsen recording is issued by 2L and samples can be found on their website.[41][42][43]

As can be seen in the following, the inherent noisefloor of MQA in this recording is actually:

Without Decoder: MQA channel noise is lowest around 4kHz @ 17.5 bits with a channel capacity of 15.8 bits which has been shaped. The MQA noise is always below that of the CD release.

With Decoder: MQA channel noise is lowest around 4kHz @ 24.3 bits with a channel capacity of over 23 bits which has been shaped.

We have…

This graph examines the run-out noise (at around 5:24) for the original WAV file recorded by John Atkinson, MQA (with and without decoding) and the underlying MQA channel noise in this recording (also with and without decoding). Also shown are reference levels for 16, 18 and 20-bit TPDF dither in a channel sampled at 88.2kHz (footnote 1).

In the graphs the noise-floor curves overlay for both MQA decoded and Original master.

We can also see that the shaped HF noise introduced by…

As before, this graph examines the run-out noise (at around 5:24) for the original WAV file (peak and average), for MQA (with and without decoding) and for the underlying MQA channel noise in this recording (also with and without decoding). Also shown are reference levels for 16, 18 and 20-bit TPDF dither in a channel sampled at 88.2kHz (footnote 1).

Additional plots show the peak level in the recording for the original WAV file and for MQA (with and without decoding). This snapshot uses the same…

[1] Stuart, J.R., 'Soundboard: High-Resolution Audio', J. Audio Eng. Soc. Vol.63 No.10, pp831–832 (Oct 2015) Open Access www.aes.org/e-lib/browse.cfm?elib=18046.

[2] Stuart, J. R. and Craven, P.G., 'A Hierarchical Approach to Archiving and Distribution', 9178, 137th AES Convention, (2014). Open Access: www.aes.org/e-lib/browse.cfm?elib=17501.

[3] Stuart, J.R., Howard, K., 'New digital coding scheme—MQA', (Japanese translation by Hiroaki Suzuki), J. Japan Audio Society, Vol.55 No.6, pp45—57 (Nov. 2015).

[4] Lipshitz, S.P., Vanderkooy, J., '…

ADC (A/D Converter): Analog to Digital Converter.

DAC (D/A Converter): Digital to Analog Converter.

Encapsulation: The process which identifies and secures the information space of a music signal and which exploits advanced sampling and reconstruction methods to optimise analogue end-to-end temporal precision while minimising data rate. We refer to the encapsulated object as the 'kernel.'

Hierarchical Coding: A conceptual framework that models analogue as an infinite sample rate, finite word-size representation which can be approximated by a…

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