Title:
TELEPHONE EQUIPMENT
Document Type and Number:
Japanese Patent JP3492257
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To cancel unnaturalness that a sound volume becomes smaller or larger just after closing a line or after a dial operation and further to cancel unnaturalness that the sound volume becomes smaller or larger by a microphone mute operation in the middle of speaking.
SOLUTION: Concernig the telephone equipment with which a telephone line network 1 and telephone equipment 24 close the line through a cross point SW circuit 23 capable of disconnecting/switching the route of audio signal transmission/reception and form an audio path, receiving AGC is turned off and a fixed gain is written and monitored in a microphone mute state by each of mute operations at the time of receiving or originating call and in the middle of speaking according to the instruction of a control part 5. Afterwards, an operation for forming full-duplex speakerphone operation is formed by turning on the receiving AGC and canceling microphone mute.
Inventors:
Yousuke Ezumi
Application Number:
JP30114299A
Publication Date:
February 03, 2004
Filing Date:
October 22, 1999
Export Citation:
Assignee:
Canon Inc
International Classes:
H04M1/60; H04B1/10; H04B3/20; (IPC1-7): H04M1/60
Domestic Patent References:
| JP10257160A | ||||
| JP5391413U |
Attorney, Agent or Firm:
Keizo Nishiyama (1 person outside)
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