Digital gain control apparatus

Abstract

A digital gain control apparatus includes a digital control signal generator producing a plurality of serial-binary coded signals, a clock pulse signal and a strobe signal. A shift register is supplied with the plurality of serial-binary coded signals and the clock pulse signal from the digital control signal generator. A latch circuit is connected to the output of the shift register and is supplied with the strobe signal from the digital control signal generator to convert the plurality of serial-binary coded signals into a plurality of parallel-binary coded signals. A decoder is connected to the output of the latch circuit to produce a plurality of control signals from the plurality of parallel-binary coded signals. A function selector circuit and a volume adjusting circuit for the selected functions is also provided, each being controlled by the plurality of control signals. The shift register, latch circuit and volume adjusting circuit are formed in one chip-integrated circuit. In one embodiment, a bass and treble tone control circuit is provided which is controlled by the output of the decoder.

Dependencies are inferred from the claim text.