Title:
LOW INPUT SIGNAL BAND WIDTH COMPRESSOR/AMPLIFIER CONTROL CIRCUIT WITH STATE VARIABLE PREAMPLIFIER
Document Type and Number:
Japanese Patent JP3888592
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce the number of parts for an amplifier circuit by providing a state variable preamplifier as a preamplifier for providing a compensation signal.
SOLUTION: The amplifier circuit 10 is provided with the state variable preamplifier 20, a filter circuit 60 and an absolute value circuit 100. An inverting amplifier 28 receives buffer input signals from the output of an input amplifier 26, and the input amplifier 26 also supplies the buffer input signals to a high- band channel indicated by a high-band passive filter circuit inside an imaginary block 32. An automatic gain control circuit, indicated by a block 24, balances a high-frequency signal component provided in the circuit of the imaginary block 32, and a center frequency component is outputted by the invertible amplifier 28. The imaginary block 40 is provided with a two-pole passive circuit network provided with a low band channel for processing a low frequency signal component. An addition amplifier 30 obtains the sum of the balanced high-frequency signal component, the center frequency signal component and the low frequency signal component, and the compensation signals are supplied at a terminal 22.
Inventors:
Gagon Paul Earl.
Application Number:
JP14083297A
Publication Date:
March 07, 2007
Filing Date:
April 22, 1997
Export Citation:
Assignee:
BBE SOUND INC.
International Classes:
H03G7/00; H03F3/181; (IPC1-7): H03G7/00; H03F3/181
Domestic Patent References:
| JP8321735A | ||||
| JP61129912A |
Attorney, Agent or Firm:
Hatsushi Shimizu