Amplitude limiter for AM broadcast transmitter

Details Amplitude limiter for AM broadcast transmitter Amplitude limiter for AM broadcast transmitter

1982-09-09

1984-12-04

Schreyer, Stafford D.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 16, H04H 500

Patent

active

044868987

ABSTRACT:
An amplitude limiter for an AM broadcast transmitter to minimize energy in the broadcasted signal outside an allocated broadcast bandwidth. The secondary and higher order spectra (i.e. second and higher harmonics) of a broadcasted AM stereophonic signal are minimized by limiting the amplitude of the audio signal, prior to modulation onto the carrier, within a predetermined portion of the audio frequency range. This is achieved by controlling the gain of the audio signals in that predetermined portion as a function of the level of a submodulation component also within that predetermined portion of the audio frequency range.

REFERENCES:
patent: 3007005 (1961-10-01), Moore et al.
patent: 4236042 (1980-11-01), Leitch
patent: 4323731 (1982-04-01), Hershberger
patent: 4338491 (1982-07-01), Parker et al.

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