EN 61606 : 1997

1 General
    1.1 Scope
    1.2 Normative references
2 Definitions, explanation of terms and abbreviations
    2.1 Definitions
    2.2 Explanation of terms
    2.3 Abbreviation
3 Measuring conditions
    3.1 Environmental conditions
    3.2 Power supply
    3.3 Test signal
    3.4 Test signal source
    3.5 Standard input conditions for the EUT
    3.6 Standard output conditions for the EUT
    3.7 Standard settings of controls
    3.8 Pre-conditioning
    3.9 Test instruments
4 Methods of measurement (digital in/analogue out)
    4.1 Output source impedance
    4.2 Output voltage and power
    4.3 Frequency response
    4.4 Gain difference between channels
    4.5 Phase difference between channels
    4.6 Phase linearity
    4.7 Total delay through the EUT
    4.8 Polarity
    4.9 Level non-linearity
    4.10 Distortion and noise
    4.11 Dynamic range
    4.12 Idle channel noise level (signal-to-noise ratio)
    4.13 Intermodulation distortion
    4.14 Out-of-band noise ratio
    4.15 Stereophonic separation
5 Classification of the characteristics to be specified
Tables
1 Frequencies used for measurements
2 Pass band of typical 1/2 fs filters unless otherwise
    specified
3 Pass band of out-of-band filters
4 Measurement frequencies for band pass filters (Hz)
5 Example of the presentation of the measured values
6 Classification of the characteristics to be specified
Figures
1 Waveform
2 Circuit arrangement for measuring output source impedance
3 Circuit arrangement for measuring output voltage
    and power
4 Circuit arrangement for measuring frequency response
5 Circuit arrangement for measuring phase difference
6 Circuit arrangement for measuring total delay
7 Circuit arrangement for measuring polarity
8 Circuit arrangement for measuring non-linearity
9 Circuit arrangement for measuring distortion and
    noise
10 Circuit arrangement for measuring dynamic range
11 Circuit arrangement for measuring idle channel noise
    level
12 Circuit arrangement for measuring stereophonic
    separation
Annexes
A Compact disc test discs
B Bibliography
ZA (normative) Normative references to international
   publications with their corresponding European
   publications

Applies to the basic measurement methods of the audio characteristics of the digital audio and audiovisual equipment (for both consumer and professional use). Covers the usual conditions and procedures for use in measuring performance characteristics of equipment with an audio bandwidth approximately one half of the sampling frequency of a system, when the audio information is processed in digital data form. Does not apply to systems including bit-rate reduced digital audio signals.