Modulation monitor for AM stereophonic broadcasts

Details Modulation monitor for AM stereophonic broadcasts Modulation monitor for AM stereophonic broadcasts

1978-03-15

1980-03-18

Olms, Douglas W.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455 67, H04H 500

Patent

active

041940881

ABSTRACT:
Apparatus is described for removing stereophonic signals contained in a broadcast signal. Removal of a stereophonic indicator tone frequency on the broadcast signal is also provided. Separate outputs measuring both a summation signal of left plus right audio signals and a difference signal of left minus right audio signals are provided. Matrix means are also included for separating left audio signal and right audio signal from the summation and difference signals. These recovered audio signals may be monitored by standard broadcast instruments to observe the performance level of the broadcast signal.

REFERENCES:
patent: 2403385 (1946-07-01), Loughlin
patent: 3068475 (1962-12-01), Avins
patent: 3148342 (1964-09-01), Holt
patent: 3218393 (1965-11-01), Kahn
patent: 3360729 (1967-12-01), Palatinus
patent: 3531722 (1970-09-01), Seibold
patent: 3908090 (1975-09-01), Kahn

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