Demodulation circuit having triangular wave for blocking harmoni

Details Demodulation circuit having triangular wave for blocking harmoni Demodulation circuit having triangular wave for blocking harmoni

1985-04-03

1985-12-24

Laroche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329 50, 381 7, H03D 104

Patent

active

045609420

ABSTRACT:
A demodulator circuit for demodulating a signal which varies substantially sinusoidally with time, such as a stereo signal having a carrier frequency, comprises a mixer circuit having a first input with a linear transfer characteristic which receives the stereo multiplex signal u.sub.m to be demodulated and having a second input with a substantially hyperbolic tangent transfer characteristic, the second input receiving a signal u.sub.d. The signal u.sub.d is a voltage having a triangular wave shape superimposed with the triangular wave shape having the carrier frequency. A stereo output signal L and R is produced having minimal third and fifth harmonics of the carrier frequency is produced from a matrix circuit as a result of the triangular shape and amplitude of the signal u.sub.d.

REFERENCES:
patent: 3831113 (1974-08-01), Ahmed
patent: 4054839 (1977-10-01), Ohsawa

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