RECOMMENDATION ITU-R BS.644-1 - Audio quality parameters for the performance of a high-quality sound-programme ...
ANNEX 1 - Reference sound-programme transmission chain
ANNEX 2 - List of audio quality parameters
1 Nominal bandwidth
2 Amplitude/frequency response
3 Group-delay variation
4 Non-linear distortion
5 Error in reconstituted frequency
6 Error in amplitude/amplitude response
7 Level stability
8 Noise (and single-tone interference)
9 Disturbing modulation by power supply
10 Stereo: level difference between A and B channels
11 Stereo: phase difference between A and B channels
12 Stereo: crosstalk between A and B channels
ANNEX 3
ANNEX 4
ANNEX 5 - Special methods for measuring audio quality parameters
1 Measurement of non-linear distortion at high frequencies in preemphasized circuits
    1.1 Introduction
    1.2 Test method
    1.3 Need for calibration signal
    1.4 Measurement in preemphasized circuits
    1.5 Use with different preemphasis characteristics
    1.6 Conclusion
2 Method of measurement of impulsive noise