Title:
TELEPHONE DEVICE, METHOD FOR CONTROLLING TELEPHONE DEVICE, AND PROGRAM
Document Type and Number:
WIPO Patent Application WO/2020/183833
Kind Code:
A1
Abstract:
The present invention provides a telephone device, a method for controlling the telephone device, and a program with which it is possible to prevent howling more reliably. The control unit (113) of a telephone device (100) performs a first process of: estimating a line echo amount on the basis of the volume of a DTMF signal generated by a DTMF signal generation unit (108) and the volume of the DTMF signal inputted from a line (200); calculating a howling threshold on the basis of the maximum value of an acoustic echo generated in a previously measured telephone receiver (104) and the set value of a sidetone volume (105), a sending volume (106) and a receiving volume (111); calculating a difference between the line echo amount and the howling threshold as a necessary adjustment amount when the line echo amount is larger than the howling threshold; and lowering the set value of the sidetone volume (105) as much as the necessary adjustment amount.
Inventors:
FUJII ATSUSHI (JP)
Application Number:
PCT/JP2019/048958
Publication Date:
September 17, 2020
Filing Date:
December 13, 2019
Export Citation:
Assignee:
NEC PLATFORMS LTD (JP)
International Classes:
H04M1/60; H04B3/20; H04R3/02
Foreign References:
| JPH08335977A | 1996-12-17 | |||
| JPH0738635A | 1995-02-07 | |||
| JP2003046636A | 2003-02-14 | |||
| JPH11234176A | 1999-08-27 | |||
| JPH0147763B2 | 1989-10-16 | |||
| JP2005176177A | 2005-06-30 | |||
| US5398282A | 1995-03-14 | |||
| JPH08335976A | 1996-12-17 | |||
| JP2019045474A | 2019-03-22 |
Other References:
See also references of EP 3731504A4
Attorney, Agent or Firm:
IEIRI Takeshi (JP)
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