Abstract： IEC 60107-5:1999 pdf freedownload.Recommended methods of measurements on receivers for television broadcast transmissions - Part 5: Electrical measurements on multichannel sound television receivers using the NICAMtwo-channel digital sound-...

IEC 60107-5:1999 pdf freedownload.Recommended methods of measurements on receivers for television broadcast transmissions - Part 5: Electrical measurements on multichannel sound television receivers using the NICAMtwo-channel digital sound-system.

3 General notes on measurements

The decoder for this sound system is generally integrated into a television receiver and it is not always possible to measure the

data before the DA converter.

3.1 General conditions

Unless otherwise stated, measurements shall be carried out under the conditions described in

IEC 60107.1 and IEC 60107-2.

3.2 Setting of the receiver

3.2.1 Introduction

Measurements should be carried out in accordance with the following conditions to ensure measurement reliability.

3.2.2 Standard output power and voltage

3.2.2.1 Standard output power for loudspeaker

The standard output power shall be a power 10 dB below the rated output power (see 3,1 of lEG 60107-2). Alternatively, a stated,

peferred value of output power, not directly related to the rated value, may be used: the preferred values are 500 mW, 50 mW and

5 mW. The corresponding levels are 27 dB(mW), 17 dB(mW) and 7 dB(mW), respectively. In all cases, the value chosen shall be stated

with the results.

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