Lamp modulating circuitry

Details Lamp modulating circuitry Lamp modulating circuitry

1980-12-22

1982-11-16

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Discharge device and/or rectifier in the supply circuit

Discharge control discharge device in the supply circuit

84464R, 315200A, 315291, 34081517, H05B 3702, H05B 4144

Patent

active

043596690

ABSTRACT:
Lamp modulating circuitry particularly useful for flashing fluorescent lamps in response to music or other audio signals employs an input filter to screen out signals having frequencies less than 20 hertz or greater than 200 hertz. An amplitude demodulator detects the peak amplitude of signals received from the input filter and develops a signal representing the envelope of the low audio frequencies. An automatic gain control compares the instantaneous and average signals derived from the amplitude demodulator and develops an average signal using an output filter. Signals transmitted past the output filter are used by lamp flashing circuitry to cause the output of a fluorescent lamp to be modulated.

REFERENCES:
patent: 3163077 (1964-12-01), Shank
patent: 3222574 (1965-12-01), Silvestri
patent: 3234847 (1966-02-01), Williams
patent: 3474774 (1969-10-01), Johnson et al.
patent: 3719857 (1973-03-01), Sharp
patent: 3798638 (1974-03-01), Goldschmied
patent: 3805049 (1974-04-01), Frank et al.
patent: 3806919 (1974-04-01), Comey
patent: 3924231 (1975-12-01), McClure
Ward, Sound-to-Light Unit, Wireless World, vol. 84, No. 1511, Jul. 1978, p. 75.

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