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IEVref:722-16-29ID:
Language:enStatus: Standard
Term: intermediate reference system
Synonym1: IRS (abbreviation)
[Preferred]
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Definition: a stable telephone transmission system intended for measurement of loudness ratings and provided with:

a sending system and a receiving system with handsets the defined sensitivity/frequency responses of which are restricted in bandwidth to typify those of sending and receiving systems of a complete telephone connection;
a device for calibrating, in terms of absolute units, the above sending and receiving systems;
an attenuator capable of adjustment to any desirable value

NOTE – The CCITT intermediate reference system is described in the CCITT Recommendation P48 from the Volume V of the Blue Book, 1989.


Publication date:1992-11
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