Patent
1974-03-22
1976-01-20
Mayer, Albert J.
84 124, 179 15BT, H04B 100
Patent
active
039342018
ABSTRACT:
A low power consumption, compact portable stereo radio transmitter and a receiver therefor, the transmitter having two audio processing channels each for receiving inputs from two stereo pickup stations and including amplifier circuits with selector switches providing a mode of even harmonic generation, a mode of odd harmonic generation, and a mode of undistorted amplification, a 38 KHz oscillator, flip flop coupled to the oscillator to provide a 19 KHz pilot signal, a difference amplifier and a balanced mixer to produce a double-sideband suppressed carrier signal centered on 38 KHz, and an amplifier for combining the balanced mixer output, the pilot signal and the two channel output and modulating a carrier signal. The receiver includes amplifier, detector, and decoder circuitry to receive the radio signals from the transmitter and produce stereo audio signals for driving a standard stereo amplifier.
REFERENCES:
patent: 3069505 (1962-12-01), Collins
patent: 3114004 (1963-12-01), Schroeder
patent: 3283079 (1966-11-01), Dixon
patent: 3534172 (1970-10-01), Weeda
patent: 3714595 (1973-01-01), Denenberg et al.
Albert S. Jackson, "Analog Computation" (1960) pp. 38, 49, 196.
Hearn Robert
Mayer Albert J.
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