TELEPHONE TERMINAL AND TELEPHONE SYSTEM USING IT, AND CONTROL METHOD OF TELEPHONE TERMINAL

Title:

TELEPHONE TERMINAL AND TELEPHONE SYSTEM USING IT, AND CONTROL METHOD OF TELEPHONE TERMINAL

Document Type and Number:

Japanese Patent JP2006108777

Kind Code:

A

Abstract:

To provide a telephone terminal in which sound echo can be suppressed effectively without deteriorating switching performance from reception state to transmission state even when it is used in a room of high sound echo.

In correspondence with a volume value being set in a speaker volume 233, a transmission detection gain capable of switching from reception state to transmission state and minimizing sound echo is prestored in a storage section 26. When the speaker volume 233 is set with an arbitrary volume value by a control section 24 and a DSP 237, a transmission detection gain corresponding to that volume value is read out from the storage section 26 and gain of a transmission detection circuit 236 is controlled according to that gain value.

Inventors:

HORIUCHI TAKESHI
UTO YOSHIHIRO
TAKAHASHI TOMOAKI

Application Number:

JP2004288891A

Publication Date:

April 20, 2006

Filing Date:

September 30, 2004

Export Citation:

Click for automatic bibliography generation Help

Assignee:

TOSHIBA CORP

International Classes:

H04B3/20; H04M1/60; H04M3/00; H04M9/08; H04Q3/58; H04M1/253

Attorney, Agent or Firm:

Takehiko Suzue
Satoshi Kono
Makoto Nakamura
Kurata Masatoshi
Takashi Mine
Yoshihiro Fukuhara
Sadao Muramatsu
Ryo Hashimoto

Previous Patent: DOCUMENT READER

Next Patent: OUTPUT CIRCUIT