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Patent Searching and Data


Title:
AUTOMATIC AUDITORY SENSE CORRECTION CIRCUIT
Document Type and Number:
Japanese Patent JP01144813
Kind Code:
A
Abstract:

PURPOSE: To make the adjustment of a circuit unnecessary by adding the output of a voltage control type level variable circuit and an original signal and making it as a signal after correcting auditory sense.

CONSTITUTION: A level detection circuit 11 detects and smooths the original signal and makes it as the original signal level. A band-pass filter(BPF) circuit 10 has the frequency characteristic of a single peak curve by making the frequency corresponding to a compass which is desired to be emphasized as a center. The voltage control type level variable circuit(VCA) 12 consists of an electron volume IC and of which gain is changed from one to zero according to the voltage of a control signal. Besides, the output of the circuit 11 is connected to the control terminal of the VCA circuit 12, the output circuit of the BPF circuit 10 is connected to the input of the VCA circuit 12 and the output is inputted to an addition circuit 13 simultaneously to the original signal. Then, the output of the circuit 13 is made to be the signal after correcting the auditory sense. Thus, as the signal of the specified frequency can be boosted and the quantity of it increases according to the fall of the inputted level, the good automatic auditory sense correction circuit is realized.


Inventors:
Sawai, Toshihito
Application Number:
JP1987000301573
Publication Date:
June 07, 1989
Filing Date:
December 01, 1987
Export Citation:
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Assignee:
FUJITSU TEN LTD
International Classes:
H03G5/16; H03G5/16; (IPC1-7): H03G5/16