Audio signal modulating system with pre-emphasis

Details Audio signal modulating system with pre-emphasis Audio signal modulating system with pre-emphasis

1994-04-04

1995-09-05

Urban, Edward F.

Telecommunications

Transmitter and receiver at separate stations

Frequency or phase modulation

4552001, 455267, 455268, 455345, 381 14, 381 86, 381107, H04B 100

Patent

active

054487579

ABSTRACT:
An FM audio system has an FM tuner, a CD player, a stereo modulator for modulating an audio signal from the CD player to produce a composite signal so as to be received by the FM tuner for reproducing the audio signal. A control circuit such as an automatic level controller is provided for controlling a level of the audio signal applied to the stereo modulator to such a level as to prevent tone quality of sound reproduced by the FM tuner from deteriorating.

REFERENCES:
patent: 3444469 (1966-04-01), Miyagi
patent: 3751601 (1973-08-01), Wally
patent: 4405836 (1983-09-01), Meyerhoff
patent: 4712250 (1987-12-01), Michels et al.
patent: 4829570 (1989-05-01), Schotz
patent: 5146507 (1992-09-01), Satoh et al.
patent: 5161131 (1992-11-01), Borchardt et al.
Electronic Communication, Schrader, 1985, pp. 360 and 420-421.
Shrader, Electronic Communication, 1985, pp. 369-370 and p. 441.
Principles of Communication System by Donald L. Schilling and Herbert Taub 1986. McGraw--Hill, pp. 383-386.

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