Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Patent
1981-01-29
1983-03-22
Mullins, James B.
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
330278, 333 14, H03G 330
Patent
active
043777880
ABSTRACT:
The envelope of an input signal to be expanded is detected and applied via an adaptive filter to the gain control input of a variable gain device which expands the input signal. The adaptive filter provides improved ripple reduction and transient response characteristics and comprises a low pass filter for producing a smoothed control signal and an analog gate for coupling the greater of the smoothed control signal or a further signal to the variable gain device, the further signal being equal to the filter input signal less two predetermined constants. The gate further includes plural current paths selectively enabled for different conditions of the low pass filter input and output signals for augmenting the supply of current to the filter.
REFERENCES:
patent: 3732371 (1973-05-01), Burwen
patent: 3980964 (1976-09-01), Grodinsky
patent: 4024463 (1977-05-01), Pelley
patent: 4220929 (1980-09-01), Talbot et al.
patent: 4307348 (1981-12-01), Nicholson
Pickering, "High Fidelity Volume Expander", Audio Engineering, Sep. 1947, pp. 112-124.
Christopher Todd J.
Mehrotra Gopi N.
Coalter R. G.
Mullins James B.
RCA Corporation
Tripoli J. S.
Wan Gene
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