METHODS OF MEASUREMENT ON RECEIVERS FOR TELEVISION BROADCAST TRANSMISSIONS - AUDIO CHANNELS - GENERAL METHODS AND METHODS FOR MONOPHONIC CHANNELS
International Electrotechnical Committee
FOREWORD
1 General
1.1 Scope
1.2 Normative references
1.3 Definitions
1.3.1 Audio channel
2 General notes on measurements
2.1 General conditions
2.2 Audio-frequency input signal
2.2.1 Standard reference frequency
2.2.2 Audiofrequencies for measurements
2.3 Radio-frequency (r.f.) television signal
2.3.1 Carrier levels
2.3.2 Modulation factor
2.3.3 Reference modulation factor
2.4 Radio-frequency input signals
2.5 Measuring system and test instruments
2.5.1 Audio filters
2.5.2 Audio-frequency spectrum analyzer
2.5.3 Audio voltmeter
2.5.4 Psophometer (weighted noise meter)
2.6 Standard measuring conditions
2.6.1 Standard r.f. television signal
2.6.2 Standard r.f. input signal levels
2.6.3 Standard output power and voltage
2.6.4 Standard receiver settings
2.7 General methods of measurement
3 Audio-frequency output power
3.1 Definition
3.2 Audio-frequency substitute load
3.3 Measurement of audio-frequency output power
4 Audio-frequency characteristics
4.1 Amplitude response to audiofrequencies
4.1.1 Audio-frequency response characteristics
4.1.2 Characteristics of tone control or
equalizer
4.1.3 Characteristics of loudness control
4.1.4 Volume control characteristic
4.2 Audio-frequency non-linear distortion
4.2.1 Introduction
4.2.2 Total harmonic distortion
4.2.3 Intermodulation
5 Internally generated interference
5.1 Buzz
5.1.1 Definition
5.1.2 Method of measurement
5.1.3 Presentation of results
5.2 Hum
5.2.1 Definition
5.2.2 Method of measurement
5.2.3 Presentation of results
5.3 Line-scan frequency interference
5.3.1 Definition
5.3.2 Method of measurement
5.4 Amplitude modulation suppression ratio
5.4.1 Definition
5.4.2 Method of measurement
5.4.3 Presentation of results
6 Sensitivity
6.1 Signal-to-noise ratio
6.1.1 Definition
6.1.2 Method of measurement
6.1.3 Presentation of results
6.2 Ultimate signal-to-noise ratio
6.2.1 Definition
6.2.2 Method of measurement
6.3 Noise-limited sensitivity
6.3.1 Definition
6.3.2 Method of measurement
6.3.3 Presentation of results
7 Immunity of undesired signals
7.1 Introduction
7.2 Basic method of measurement
7.2.1 Measurement set-up
7.2.2 Measurement procedure
7.3 Presentation of results
Table
1 Preferred frequencies
Figures
1 200 Hz to 15 kHz bandpass filter
2 22,4 Hz to 15 kHz bandpass filter
3 Measurement of amplitude modulation suppression ratio
4 Measurement of signal-to-noise ratio
5 Measurement of wanted-to-unwanted r.f. signal ratio
Annex
A Bibliography
Addresses general measuring methods of audio channels of receivers for monophonic systems and multichannel sound systems. General consideration for measurements are defined in IEC 107-1, with measurements specific to the multichannel sound systems are addressed by IEC 107-3, 107-4, and 107-5. Non-broadcast signals measurements are covered by IEC 107-6. Deals with performance determination and allows the comparing of equipment by means of a list of characteristics for specifications and laying down of uniform measurement methods for the characteristics. Does not specify performance requirements. Does not cover general safety methods
| Document Type | Standard |
| Status | Current |
| Publisher | International Electrotechnical Committee |
| Committee | TC 100 |
