Title:
SIGNAL OUTPUT ADJUSTMENT DEVICE
Document Type and Number:
Japanese Patent JP3186573
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide the signal output adjustment device such as a muting circuit not causing a click noise unpleasant to ears produced in an operation switching state or the like.
SOLUTION: A manual switch SW1 is open at signal reproduction. A control circuit 30 makes contacts of relays RL1, RL2 open so as to keep a variable impedance circuit Z1 to be a high impedance. Thus, a signal is outputted to an output terminal 22. Then the manual switch SW1 is switched to be closed. The control circuit 30 closes the contact of the relay RL2 and controls the variable impedance circuit Z1 to change the impedance from a high to a low impedance along with a proper time constant. Thus, a click noise caused attended with the switching of the manual switch SW1 is not produced. After the impedance reaches a sufficiently low impedance, the contact of the relay RL1 is closed. The output terminal 22 connects to ground and the signal output is completely stopped. Thus, a sound is not leaked at muting ON.
Inventors:
Joji Kasai
Application Number:
JP7679196A
Publication Date:
July 11, 2001
Filing Date:
March 29, 1996
Export Citation:
Assignee:
Onkyo Corporation
International Classes:
H03F1/00; H03G3/00; (IPC1-7): H03F1/00
Domestic Patent References:
| JP642413A | ||||
| JP62294309A | ||||
| JP4988651U |
Attorney, Agent or Firm:
Furuya Eiko (2 outside)