Telephone apparatus, method of controlling telephone apparatus, and program
AssigneeNEC Platforms, Ltd.
InventorAtsushi Fujii
Life of this patent
Estimating the term…
Abstract
A control unit of a telephone device is configured to perform a first processing of: estimating a line echo amount based on a volume of a DTMF signal generated by a DTMF signal generation unit and a volume of the DTMF signal input from a line; calculating a howling noise threshold value based on the maximum value of the acoustic echo generated at a handset that is measured in advance and set values of a sidetone volume, a transmission volume, and a reception volume; and calculating a difference between the line echo amount and the howling noise threshold value as an adjustment requisite amount and lowering the set value of the sidetone volume by the adjustment requisite amount when the line echo amount is larger than the howling noise threshold value.
Claims15
A telephone apparatus comprising:
- a DTMF signal generation unit configured to generate a DTMF signal based on a telephone number;
- a line interface unit configured to transmit the DTMF signal to a line;
- a line volume measurement unit configured to measure a volume of the DTMF signal input from the line;
- a sidetone volume configured to adjust a volume of a sidetone signal;
- a transmission volume configured to adjust a volume of a transmission signal;
- a reception volume configured to adjust a volume of a reception signal;
- a control unit configured to control the sidetone volume, the transmission volume, and the reception volume;
- and
- a storage unit configured to store
- a maximum value of an acoustic echo generated at a handset and
- set values of the sidetone volume, the transmission volume, and the reception volume,
- wherein
- the control unit is configured to perform a first processing of:
- estimating a line echo amount based on
- a volume of the DTMF signal generated by the DTMF signal generation unit and
- a volume of the DTMF signal input from the line;
- calculating a howling noise threshold value based on
- the maximum value of the acoustic echo and
- the set values of the sidetone volume, the transmission volume, and the reception volume;
- and
- calculating a difference between the line echo amount and the howling noise threshold value as an adjustment requisite amount and
- lowering the set value of the sidetone volume by the adjustment requisite amount
- when the line echo amount is larger than the howling noise threshold value.
A method of controlling a telephone apparatus comprising performing, by a control unit of the telephone apparatus, a first processing of:
- estimating a line echo amount based on
- a volume of a DTMF signal generated based on a telephone number and
- a volume of the DTMF signal input from a line;
- calculating a howling noise threshold value based on
- a maximum value of an acoustic echo generated at a handset and
- set values of a volume of a sidetone signal, a volume of a transmission signal, and a volume of a reception signal;
- and
- calculating a difference between the line echo amount and the howling noise threshold value as an adjustment requisite amount and
- lowering the set value of the volume of the sidetone signal by the adjustment requisite amount
- when the line echo amount is larger than the howling noise threshold value.
A non-transitory computer readable medium storing a program for a causing
- a control unit of a telephone apparatus to perform a first processing of:
- estimating a line echo amount based on
- a volume of a DTMF signal generated based on a telephone number and
- a volume of the DTMF signal input from a line;
- calculating a howling noise threshold value based on
- a maximum value of an acoustic echo generated at a handset and
- set values of a volume of a sidetone signal, a volume of a transmission signal, and a volume of a reception signal;
- and
- calculating a difference between the line echo amount and the howling noise threshold value as an adjustment requisite amount and
- lowering the set value of the volume of the sidetone signal by the adjustment requisite amount
- when the line echo amount is larger than the howling noise threshold value.
Dependencies are inferred from the claim text.