JP6447763B1 - Handset - Google Patents

Abstract

A handset suitable for use with a softphone and having a high degree of design freedom is provided.
A handset 1A includes a microphone 10 for inputting a transmission signal, a speaker 11 for outputting a reception signal, and a transmission signal for outputting the transmission signal input to the microphone 10 to a softphone 2. An output unit 13, a reception signal input unit 14 for inputting a reception signal from the softphone 2, a side sound circuit 16, and an attenuation filter 17 are provided. The side sound circuit 16 mixes the transmission signal input to the microphone 10 with the reception signal input to the reception signal input unit 14 and outputs the mixed signal from the speaker 11. The attenuation filter 17 attenuates a signal component in a howling frequency band, which is a frequency band that is highly likely to cause howling, from a transmission signal input to the side sound circuit 16.
[Selection] Figure 1

Description

  The present invention relates to a telephone handset, and more particularly to a handset suitable for use with a softphone.

  Conventionally, in a telephone equipped with a handset, during a call, the speaker's voice input to the handset's microphone (transmitter) can be output from the handset's speaker (receiver) so that the speaker can confirm it by himself / herself. For this reason, there is a telephone body that incorporates a side sound circuit that mixes a transmission signal input to a microphone with a reception signal output from a speaker. For example, in the remote telephone station described in Patent Document 1, a built-in telephone hybrid circuit functions as a side sound circuit, and a transmission signal input to a microphone is mixed with a reception signal output from a speaker.

Japanese Patent Laid-Open No. 63-214055

  In recent years, softphones that enable telephone calls via the Internet using software using information processing devices such as smartphones, tablets, and personal computers have become widespread. Even in such a softphone, convenience can be improved if the handset can be used when used at a desk or the like. However, many softphones do not assume the use of a handset, and for this reason, most of them do not include a side sound circuit. In general, since the handset causes howling if the microphone and the speaker are too close to each other, the handset must be designed so that the microphone and the speaker are sufficiently separated within a range that does not interfere with the telephone call. This is a limitation in designing handsets according to the design of smartphones, tablets, and PCs.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a handset that is suitable for use with a softphone and has a high degree of design freedom.

  In order to solve the above-described problems, the present invention incorporates a side sound means for mixing a transmission signal inputted to a microphone with a reception signal outputted from a speaker and a howling prevention means for preventing howling in the handset.

Here, the howling prevention means, if the volume level of the input transmission signal to the microphone is below a predetermined howling occurrence level, select the composite signal output from the sidetone means, predetermined howling occurrence When the level is equal to or higher than the level, a selector that selects the reception signal to be input to the side sound means and outputs it to the speaker is used .

For example, the present invention
A telephone handset,
A microphone for inputting the transmission signal;
A speaker for outputting a received signal;
Side sound means for mixing the transmission signal input to the microphone with the reception signal output from the speaker;
And howling prevention means for preventing howling ,
The howling prevention means includes
When the volume level of the transmission signal input to the microphone is less than a predetermined howling occurrence level, the hybrid signal output from the side sound means is selected, and when the sound level is equal to or higher than the predetermined howling occurrence level, It is a selector that selects a reception signal to be input to the side sound means and outputs it to the speaker .

  In the present invention, since the side sound means is incorporated in the handset, even a telephone such as a soft phone that does not incorporate the side sound means outputs the voice of the speaker input to the microphone from the speaker during a call. The speaker can be able to confirm by himself / herself. In addition, since a howling prevention means is provided in the handset, it is possible to design the microphone and speaker close to each other without worrying about howling. Design the handset according to the design of a smartphone, tablet, computer, etc. Can do. Therefore, according to the present invention, it is possible to provide a handset that is suitable for use with a softphone and has a high degree of design freedom.

FIG. 1 is a schematic functional configuration diagram of a handset 1A according to the first embodiment of the present invention. FIG. 2 is a schematic functional configuration diagram of the handset 1B according to the second embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings.

[First embodiment]
FIG. 1 is a schematic functional configuration diagram of a handset 1A according to the first embodiment of the present invention.

  The handset 1A according to the present embodiment is used by being connected to a softphone (information processing apparatus) 2 that enables a telephone call via the Internet by software. As shown in FIG. A microphone (transmitter) 10 for transmitting, a speaker (receiver) 11 for outputting a reception signal, a transmission signal amplification unit 12 for amplifying the transmission signal input to the microphone 10, and a transmission signal amplification The transmission signal output unit 13 that outputs the transmission signal amplified by the unit 12 to the softphone 2, the reception signal input unit 14 for inputting the reception signal from the softphone 2, and the reception signal input unit 14 A reception signal amplifier 15 for amplifying the received signal, a side sound circuit 16, and an attenuation filter 17.

  The side sound circuit 16 mixes the transmission signal input to the microphone 10 with the reception signal amplified by the reception signal amplifier 15 and outputs the mixed signal from the speaker 11.

  The attenuation filter 17 attenuates a signal component in a howling frequency band, which is a frequency band that is highly likely to cause howling, from a transmission signal input to the side sound circuit 16. Here, it is empirically known that howling is caused by positive feedback of a signal in a frequency band of 1 kHz to 2 kHz. Therefore, in the present embodiment, the howling frequency band is set to 1 kHz to 2 kHz. Since the vowel frequency band of the call voice is about 100 Hz to 300 Hz, even if the signal component in the howling frequency band is attenuated, the influence on the voice of the speaker included in the transmission signal input to the microphone 10 is small. Conceivable.

  In the present embodiment, since the handset 1A has the side sound circuit 16 built in, the voice of the speaker input to the microphone 10 during a call can be obtained even on a telephone such as the softphone 2 that does not have the side sound circuit. Can be output from the speaker 11 and can be confirmed by itself. In addition, since the attenuation filter 17 for attenuating the signal component in the howling frequency band, which is a frequency band that is highly likely to cause howling, is provided from the transmission signal input to the side sound circuit 16, the microphone can be used without worrying about howling. The handset 1A can be designed by bringing the speaker 10 and the speaker 11 close to each other, and the handset 1A can be designed according to the design of a smartphone, tablet, personal computer, or the like. Therefore, according to the present embodiment, it is possible to provide handset 1A that is suitable for use with softphone 2 and has a high degree of design freedom.

[Second Embodiment]
FIG. 2 is a schematic functional configuration diagram of the handset 1B according to the second embodiment of the present invention.

  As shown, the handset 1B according to the present embodiment is different from the handset 1A according to the first embodiment shown in FIG. 1 in that a selector 18 is provided instead of the attenuation filter 17. Other configurations are the same as those of the handset 1A according to the first embodiment shown in FIG.

  The selector 18 is a hybrid output from the side sound circuit 16 when the volume level of the transmission signal input to the microphone 10 is less than a howling occurrence level set in advance as a volume level that is highly likely to cause howling. A signal is selected and output to the speaker 11. On the other hand, when the volume level of the transmission signal input to the microphone 10 is equal to or higher than the howling occurrence level, the reception signal amplified by the reception signal amplification unit 15 is selected and output to the speaker 11. Here, when the volume level of the transmission signal input to the microphone 10 is equal to or higher than the howling occurrence level, the selector 18 selects the reception signal amplified by the reception signal amplification unit 15 and outputs it to the speaker 11. The voice of the speaker input to the microphone 10 cannot be output from the speaker 11 so that the speaker can confirm it. However, howling is prevented by blocking the positive feedback via the side sound circuit 16, and the volume level of the transmission signal input to the microphone 10 immediately falls below the howling occurrence level and is output from the side sound circuit 16. Therefore, it is considered that there is almost no trouble for the speaker to confirm his / her voice.

  Also in the present embodiment, as in the first embodiment, the handset 1B has the side sound circuit 16 built in. Therefore, even in a telephone such as the softphone 2 that does not have the side sound circuit, a microphone can be used during a call. The voice of the speaker input to 10 can be output from the speaker 11 so that the speaker can confirm it. In addition, when the volume level of the transmission signal input to the microphone 10 is lower than a howling occurrence level set in advance as a volume level that is highly likely to cause howling, a mixed signal output from the side sound circuit 16 is output. Since the selector 18 for selecting the received signal amplified by the received signal amplification unit 15 and outputting it to the speaker 11 is provided in the handset 1B when it is selected and output to the speaker 11 and above the howling occurrence level, howling The handset 1B can be designed by bringing the microphone 10 and the speaker 11 close to each other without worrying about the above, and the handset 1B can be designed according to the design of a smartphone, tablet, personal computer, or the like. Therefore, according to the present embodiment, it is possible to provide handset 1B that is suitable for use with softphone 2 and has a high degree of design freedom.

  The embodiment of the present invention has been described above.

  In addition, this invention is not limited to said embodiment, Many deformation | transformation are possible within the range of the summary.

  For example, howling prevention means built in the handset is not limited to the attenuation filter 17 of the handset 1A according to the first embodiment and the selector 18 of the handset 1B according to the second embodiment. Other howling prevention such as an echo canceller circuit that removes the signal component of the reception signal output from the speaker 11 from the transmission signal input to the microphone 10 and outputs the signal to the transmission signal amplifier 12 and the side sound circuit 16 The means may be built into the handset.

1A, 1B: Handset 2: Softphone 10: Microphone 11: Speaker 12: Transmission signal amplification unit 13: Transmission signal output unit 14: Reception signal input unit 15: Reception signal amplification unit 16: Side sound circuit 17: Attenuation filter 18: Selector

Claims (1)

A telephone handset,
A microphone for inputting the transmission signal;
A speaker for outputting a received signal;
Side sound means for mixing the transmission signal input to the microphone with the reception signal output from the speaker;
And howling prevention means for preventing howling,
The howling prevention means includes
When the volume level of the transmission signal input to the microphone is less than a predetermined howling occurrence level, the hybrid signal output from the side sound means is selected, and when the sound level is equal to or higher than the predetermined howling occurrence level, A handset comprising: a selector that selects a reception signal input to the side sound means and outputs the selected reception signal to the speaker.

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