Instantaneous deviation limiter with pre-emphasis and zero avera

Details Instantaneous deviation limiter with pre-emphasis and zero avera Instantaneous deviation limiter with pre-emphasis and zero avera

1986-12-30

1989-01-31

Masinick, Michael A.

Telecommunications

Transmitter

Angle modulation

455116, 455126, H04B 102

Patent

active

048022365

ABSTRACT:
A modulation limiter that eliminates over-deviation otherwise caused by asymmetrical modulation signals in a frequency modulated (FM) transmitter. The output signal from a conventional modulation clipper is integrated, multiplied by a gain constant, and subtracted from the input, which causes the clipper output to have zero average and a high-pass frequency response with a time constant determined by the feedback gain. The zero average value allows the clipped modulation signal to be coupled to a modulator without over-deviation caused by shifts in the average value of the clipped signal, and the high-pass response can be used to give the modulation signal pre-emphasis.

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