Electrical audio signal processing systems and devices – One-way audio signal program distribution – Multiple channel
Patent
1986-05-08
1990-12-18
Isen, Forester W.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Multiple channel
H04B 300
Patent
active
049792172
ABSTRACT:
Controller for use at a listening station in an audio distribution system for selecting a channel of audio programming. The controller has input attenuators for reducing the level of the audio signals, an output amplifier, and a controlled analog switch connected between the attenuators and the amplifier for passing the attenuated audio signal from a selected channel to the output amplifier. The amplifiers have a relatively high imput impedance, and the amplifiers in the distribution system operate at a relatively low power level. The attenuated audio signals are impressed upon a voltage centered in the operating range of the analog switch. In the disclosed embodiment, the analog switch comprises a multiplexer, a counter connected to the address inputs of the multiplexer, and a channel selection switch for applying clock pulses to the counter to step the multiplexer through the audio channels in a predetermined sequence.
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