Pre-processing apparatus for FM stereo overshoot elimination

Details Pre-processing apparatus for FM stereo overshoot elimination Pre-processing apparatus for FM stereo overshoot elimination

1978-12-18

1980-06-10

Bookbinder, Marc E.

Telecommunications

Transmitter

Angle modulation

179 1P, 332 18, 455 43, H04B 104

Patent

active

042075262

ABSTRACT:
An audio waveform is modified before being applied to a typical FM stereo generator having a low-pass filter which normally produces ringing in response to a clipped signal by pre-emphasizing the audio and reducing the level of that pre-emphasized audio when reaching the maximum allowable modulating signal level. This pre-emphasized audio level is reduced by an amount determined by the ringing in the low-pass filter in the stereo generator to follow.

REFERENCES:
patent: 3109991 (1963-11-01), Ocko
patent: 3529244 (1970-09-01), Torick et al.
patent: 3815040 (1974-06-01), Seidel
patent: 4110692 (1978-08-01), Pradal
"Combining High Signal Quality with High Modulation Levels in FM"--Eric Small et al., Oct. 1975--Broadcast Management/Engineering, p. 44.
"A New Filtering Process for Optimal Overshoot Control"--D. L. Hershberger, Harris Corp. Engineering Report.

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