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

042075270

ABSTRACT:
An audio processor for an FM stereo system including a peak clipping circuit to prevent overmodulation further includes means responsive to the audio signal before and after the clipping means for detecting the amount of energy lost due to peak clipping and gain control means for reducing the amplitude level of the clipped audio signal in proportion to the peak energy lost to prevent overmodulation due to the shifting of the entire signal level which is associated with any asymmetry of the clipped signal.

REFERENCES:
patent: 3117278 (1964-01-01), Johnson
patent: 3815040 (1974-06-01), Seidel
"Variable Emphasis Limiters for Sound-Programme Signals"--Gleave et al.--Sep. 1976--pp. 149-153, Int'l. Broadcast Convention, London, England.
"Combining High Signal Quality with High Modulation Levels in F.M."--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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