Wave transmission lines and networks – Amplitude compression and expansion systems
Patent
1981-05-12
1983-10-25
Gensler, Paul L.
Wave transmission lines and networks
Amplitude compression and expansion systems
333174, H04B 164
Patent
active
044121890
ABSTRACT:
Either an input signal of a combining network or an output signal of an inverter arranged on a main path is fed to a side path through a mode switch in a switchable signal compressor/signal expander. Since an input terminal of a control amplifier is connected to a variable filter without passing through a signal amplifier, the deviation of the detection characteristic of a rectifier and integrator attributed to D.C. offset voltages of the signal amplifier and the control amplifier can be reduced. On the other hand, a switchable signal compressor/signal expander in another aspect of performance has a reference voltage generator for producing a D.C. reference voltage, and the output D.C. level of the control amplifier is maintained at a level approximate to the D.C. reference voltage. The other ends of first and second capacitors of the rectifier and integrator are also supplied with the D.C. reference voltage, so that the fluctuation of the detection characteristic of the rectifier and integrator ascribable to the fluctuation of the D.C. reference voltage is reduced.
REFERENCES:
patent: 3729693 (1973-04-01), Dolby
Yamaguchi et al., A New Configuration Using a Voltage Controlled Amplifier for a Dolby System Integrated Circuit, IEEE Trans on CE, vol. CE-25, Nov. 1979, pp. 723-730.
Kominami Yasuo
Ohkubo Yuichi
Sato Tetsuo
Gensler Paul L.
Hitachi , Ltd.
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