Stereo indicating circuit

Details Stereo indicating circuit Stereo indicating circuit

1982-07-23

1984-06-19

Hickey, R. J.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

H04H 500, H04S 700

Patent

active

044556730

ABSTRACT:
In a circuit for indicating reception of stereo signals (for use in e.g. a radio tuner or television) audio signals prevailing in the left (L) and right (R) output channels are applied to respective limiting circuit and the output signals derived are fed to OR gate. When a monoaural signal is detected, the signals in the two output channels will be in coincidence and so the output from the exclusive OR gate remains low. When stereo signals are detected, however, a finite phase difference exists between the two signals and the output for the OR gate is correspondingly high. A Schmitt trigger drives an LED display whenever the output from the OR gate exceeds a preset threshold level to provide an indication that a stereo signal is being reproduced. A capacitor/resistor circuit imposes a time delay on level changes at gate so that the LED display remains illuminated, even during momentary interruptions of the audio signal.

REFERENCES:
patent: 4236041 (1980-11-01), Thomas
Funk-Technik, vol. 30, No. 6, 1975, pp. 129-130, Munchen, DE J. Rathlev "Neuartige Stereo-Anzeige" with translation.
Elektor, vol. 2, Jul./Aug. 1976, p. 763, Canterbury, G. B., Paragraph 96.

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