| 摘要 |
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.
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