1887

Handbook on Telephonometry

image of Handbook on Telephonometry

The Handbook on Telephonometry is intended to be a practical manual and serves as a guide to sound engineering practice. Passages of a textbook nature have also been included to help in understanding the underlying principles.

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Objective measurements

In making objective electro-acoustic measurements on telephones, the human mouth and ear are replaced by a sound for driving the handset microphone and by an acoustic coupler for terminating the receiver. The sound source is referred to as an artificial mouth and consists of a moving coil loudspeaker housed in a small enclosure with supplementary acoustic circuit elements leading to a single sound port. The acoustic coupler is referred to as an artificial ear and consists of a microphone in a terminating air volume, often with supplementary acoustic circuit elements. The artificial mouth, together with a source of electrical energy, is often referred to as an artificial voice; however, this term should properly be reserved for those cases in which the resulting acoustic output is a speech-like signal.

English

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