Decorative light blinking device using pll circuitry for blinking to

Abstract

There is provided a compact, low-cost decorative light blinking device which is capable of accurately and precisely blinking illuminants of channels in response to music (the frequency of sound), and which has circuitry with reduced number of components. An audio frequency range (from 20 Hz to 20 KHz) can be divided into about 10 frequencies. The decorative light blinking device flashing to music, includes a plurality of channels, each including a buffer amplifier, a PLL circuit connected to the buffer amplifier and having a phase comparator, a loop filter and voltage control oscillator and lock state detecting circuit which generates a positive or negative logic digital output signal, a time constant circuit connected to the PLL circuit, an output circuit connected to the time constant circuit, and a decorative illuminant connected to the output circuit and turned on or off by an output from the output circuit,and a signal input point into which input terminals of the buffer amplifiers of the channels are formed, and through which an electric music signal is input from audio equipment, free-running frequencies and capture ranges of the PLL circuits of the channels being arbitrarily set to within an audio frequency range so that the free-running frequencies and the capture ranges do not basically overlap with each other, the PLL circuits being set so as to be locked with respect to only frequencies corresponding to the capture ranges which are arbitrarily set in all frequency components constituting the music signal, whereby the time constant circuits integrate an output signal from the lock state detecting circuits in the PLL circuits to convert the decorative illuminants from a state where the decorative illuminants are always turned off to a state where the same are turned on.