JP5494321B2 - Telephone control device having ambient noise cancellation function - Google Patents

Description

  The present invention relates to a telephone control device having a function of canceling ambient noise.

  In a conventional telephone device having a function of canceling ambient noise, a microphone for hands-free calling, a handset including a transmitter and a receiver, and a noise suppression circuit for canceling ambient noise are mounted on the telephone, There has been known a method of canceling an ambient noise component collected by the microphone for hands-free communication from a transmission voice signal input by the transmitter by a suppression circuit and transmitting the signal to a partner apparatus.

  This is because the “noise pickup microphone” and “noise removal circuit section” in Patent Document 1 and “hands-free microphone” and “signal processing section” in Patent Document 2 are An implementation for canceling noise is shown.

JP-A-9-284374

JP 2010-16516 A

  However, these conventional telephone devices have a drawback in that the cost of the telephone is increased because it is necessary to install a noise suppression circuit in addition to the microphone for collecting ambient noise on the telephone side.

  Accordingly, an object of the present invention is to suppress an increase in the cost of each extension telephone by installing a noise suppression circuit that suppresses ambient noise in a key telephone system that accommodates a plurality of extension telephones or a telephone controller of a private branch exchange. There is.

  In order to solve the above-mentioned problems, a first aspect of the present invention is a telephone control apparatus that accommodates an external line and an internal line and controls a plurality of internal telephones connected to the internal line. Select an extension telephone that is not in a call, activate voice input means provided in the selected extension telephone, and receive ambient voice collected by the voice input means from the extension telephone as an ambient noise signal Adjusting the amplitude or phase of the ambient noise signal received by the ambient noise signal receiving means and the ambient noise signal receiving means, and canceling the ambient noise signal component from the transmitted voice signal received from the extension telephone in communication Ambient noise canceling means, and transmitting the transmitted voice signal from which the ambient noise signal component has been canceled to a communication partner of the extension telephone device during the call. .

  The second aspect of the present invention further includes an installation location storage means for storing information relating to the installation locations of the plurality of extension telephones, and the ambient noise signal receiving means includes a plurality of extension telephones that are not in a call. If present, refer to the installation location storage means, select an extension telephone that is not in a call closest to the extension telephone in a call, and receive an ambient noise signal from the selected extension telephone It is characterized by.

  Further, in a third aspect of the present invention, when there are a plurality of extension telephones that are not in a call, the ambient noise signal receiving means receives a plurality of ambient noise signals from a plurality of extension telephones that are not in a call, and the ambient noise The canceling unit adjusts the amplitude or phase of the plurality of ambient noise signals received by the ambient noise signal receiving unit and executes a predetermined calculation process to extract a common ambient noise component included in the plurality of ambient noise signals. The common ambient noise component is canceled from the transmitted voice signal received from the extension telephone during the call.

  According to the present invention, an ambient noise signal is collected by using a transmitter of an extension telephone that is not in a call, and a component of the ambient noise signal is canceled by a noise suppression circuit mounted on the telephone control device side. There is no need to install a noise suppression circuit in each extension telephone, and the cost of the entire telephone system having an ambient noise canceling function can be suppressed.

Block configuration diagram of telephone control device and extension telephone having ambient noise cancellation function according to the present invention Operation flowchart of control unit of telephone control device according to the present invention Flow chart for transmitting ambient noise signal in control unit of extension telephone Example of contents of terminal installation location / state storage unit of telephone control device according to the present invention

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

  FIG. 1 is a diagram showing a block configuration of a telephone control device having an ambient noise canceling function and an extension telephone according to the present invention. The telephone control apparatus 5 includes a plurality of extension telephones 1 to 4 via extension interface units 521 to 524. Also connected to the telephone network 6 via the external line interface unit 531.

  The extension telephones 1 to 4 have dial keys for specifying the other party to be connected and key / hook switch state detecting units 113, 213, 313, and 413 for detecting a telephone state during a call or standby, and pressing these keys. The control unit 112, 212, 312, 412 detects the state change of the hook switch and the hook switch, and sends it to the control unit 512 of the telephone control device 5 via the line interface units 111, 211, 311, 411. The control unit 512 performs call control for calling a designated party based on the detected dial key information, and the telephone state such as busy (off-hook state) / standby (on-hook state) according to the detected hook switch state. Perform management. Each time the telephone state changes, the state information of the corresponding extension telephone in the terminal installation location / state storage unit 513 is updated.

  When the extension telephone 1 is in a call state with the other party, the transmission voice V1 uttered by the user is input by the transmitter 103 in the handset 101, and the transmission voice transmission section 115 and the line interface section 111 are input. To the communication path switch 511 of the telephone control device 5. Also, the received voice signal from the other party is received by the received voice reproduction unit 114 from the communication path switch 511 via the line interface unit 111, and is output from the receiver 102 in the handset 101.

  At this time, since ambient noise N1 is simultaneously input to the transmitter 103 in addition to the transmitted voice V1, in practice, “send voice V1 + ambient noise N1” is telephone controlled as a voice signal directed to the other party. Input to the device 5.

  Next, the extension telephone 4 that is the other party of the call is connected to the telephone control device 5 via the line interface unit 411, and the transmission voice signal of the extension telephone 1 sent via the communication path switch 511 is received voice. The data is received by the playback unit 414 and output from the handset 402 in the handset 401. A voice signal input from the transmitter 403 in the handset 401 is sent to the communication path switch 511 of the telephone control device 5 via the transmission voice transmission unit 415 and the line interface 411 and relayed to the extension telephone 1. .

  At this time, when the extension telephone 1 and the other party (in this case, the extension telephone 4) are in a talking state, the control unit 512 of the telephone control device 5 determines the extension from the information stored in the terminal installation location / state storage unit 513. An extension telephone installed in the vicinity of the telephone 1 is searched, an extension telephone 2 and an extension telephone 3 that are not busy are selected, and an ambient noise signal is sent to the selected extension telephone 2 and extension telephone 3. Is collected and transmitted to the telephone control device. The control units 212 and 312 of the extension telephone 2 and the extension telephone 3 that have received this ambient noise transmission request enable the transmitters 203 and 303 and the transmission voice transmission units 215 and 315, and the surroundings input by the transmitter The noise signal N1 is transmitted to the telephone control device 5.

  Next, the telephone control device 5 controls the speech path switch 511 to input the transmission voice signal received from the extension telephone 1 to the noise component canceling unit 515 and to detect the ambient noise signal received from the extension telephone 2 as noise. The ambient noise signal received from the component processing unit A516 and the extension telephone 3 is connected to the noise component processing unit B517.

  In the noise component processing unit A and the noise component processing unit B, the amplitude or phase of the input ambient noise signal is adjusted and sent to the noise component cancellation unit 515.

  The noise component canceling unit 515 performs predetermined arithmetic processing and is common to signals transmitted from the noise component processing unit A and the noise component processing unit B from the transmission voice signal (V1 + N1) received from the extension telephone 1. The voice signal component is regarded as the ambient noise N1, and the received voice V2 from which the ambient noise N1 has been subtracted is generated and transmitted to the other party (in this case, the extension telephone 4).

  Thereby, the extension telephone 4 of the other party can listen to the clear reception voice V2 in which the ambient noise N1 is canceled from the transmission voice signal component (V1 + N1) input by the extension telephone 1.

  In this embodiment, two extension telephones that collect ambient noise are described. However, one or more extension telephones may be used to realize the noise canceling function.

  Further, in one extension telephone, the transmitter in the handset is also used for inputting the ambient noise signal, but a microphone for hands-free calling can also be used for collecting the ambient noise signal.

  In the present embodiment, the destination of the call is described as an extension telephone, but an external telephone terminal connected to the external line interface unit 531 via the telephone network 6 may be used.

FIG. 2 is an operation flow of the control unit of the telephone control device according to the present invention.
In the present embodiment, the extension telephone 1 in FIG. 1 makes a call, calls the extension telephone 4, and the noise component included in the transmitted voice signal of the extension telephone 1 is in the standby state installed near the extension telephone 1. It is considered that it corresponds to the transmission voice signal received from the telephone 2 and the extension telephone 3, and the ambient noise is canceled by subtracting this from the transmission voice signal received from the extension telephone 1, and the other party (in this case, the extension) A description will be made assuming that the received voice signal is transmitted to the telephone 4).

  When it is detected in the standby state (S5000) that the extension telephone 1 is off-hook (S5001, Y), the telephone state of the corresponding terminal location / state storage unit 513 is updated to the off-hook state (S5010), and the dial key is pressed. When the end of pressing the dial key is detected (S5011, Y), the designated destination (extension telephone 4) is called (S5012). When the destination answers (S5013, Y), the communication path switch 511 is instructed. Then, the communication path between the extension telephone 1 and the extension telephone 4 is connected (S5041). At this time, the transmitted voice signal from the extension telephone 1 is relayed to the other party via the noise component canceling unit 515 in FIG.

  Next, the terminal installation location / state storage unit 513 is searched, and the extension telephones (in this case, the extension telephone 2 and the extension telephone 3) are installed in the vicinity of the extension telephone 1 and the telephone status is on-hook (not in a call). ) Is extracted (S5042).

  The control unit 512 transmits an ambient noise signal transmission request to the extracted extension telephone (S5043), and the transmission voice signal (ambient noise signal) from the corresponding extension telephone is converted into a noise component processing unit (516, 517). The communication path switch is controlled so as to be connected to () (S5044).

  As a result, the noise component processing unit adjusts the amplitude or phase of the ambient noise signal component received from the extension telephone 2 and the extension telephone 3 installed in the vicinity of the extension telephone 1 and sends it to the noise component cancellation unit 515, thereby reducing the noise. The component canceling unit 515 performs predetermined calculation processing, cancels only the ambient noise N1 from the transmission voice signal (V1 + N1) input from the extension telephone 1, and sends it to the extension telephone 4 of the other party.

  Next, when it is detected that the extension telephone 1 is on-hooked (S5045, Y), the telephone state of the corresponding terminal installation location / state storage unit is updated to the on-hook state (S5050), and then an ambient noise signal is transmitted. The extension telephone is instructed to stop sending ambient noise signals (S5061), the communication path switch is instructed, the communication path of each extension telephone is released (S5062), and the process returns to the standby state (S5000).

  In step 5001, the off-hook state is not detected (S5001, N), and if an incoming call is detected (S5002, Y), the corresponding extension telephone is called (S5021), and the corresponding extension telephone is off-hook (response). When this is detected (S5022, Y), the telephone state of the corresponding terminal installation location / state storage unit is updated to the off-hook state (S5030), and then the process proceeds to step 5041 and subsequent steps, and similarly the ambient noise signal component is canceled. Calls are made.

  FIG. 3 is an operation flow for transmitting an ambient noise signal in the control unit of the extension telephone. When a request for transmitting an ambient noise signal is received from the control unit 512 of the telephone control device 5 in the standby state (S2000) (S2001, Y). Then, it is determined whether or not the own telephone is in an on-hook state (during a call) (S2002). When in the on-hook state (not in a call) (S2002, Y), the transmitted voice transmitting unit is enabled and the ambient noise signal input by the transmitter is sent to the telephone control device (S2011).

  If it is in the off-hook state (calling) in step 2002 (S2002, N), the process returns to the standby state (S2000).

  Next, when an ambient noise signal transmission stop request is received from the control unit 512 of the telephone control device 5 (S2021, Y), the transmission voice transmission unit is disabled and transmission of the ambient noise signal to the telephone control device side is stopped. (S2022), it returns to the standby state (S2000).

  FIG. 4 is a diagram showing an example of the contents of the terminal installation location / state storage unit of the telephone control apparatus according to the present invention. This storage unit stores telephone location information and telephone status in association with each extension number. This is a memory, and when the off-hook / on-hook of the corresponding telephone is detected in the processing of FIG. 2 (S5010, S5030, S5050), the corresponding telephone state is updated.

  Further, in this embodiment, when the extension telephone having the extension number 101 is in a call state, the extension number 103 (V5003) which is not in a call (on-hook state) among a plurality of extension telephones belonging to the same installation location (A5). ) And extension number 202 (V5005) are selected as extension telephones for collecting ambient noise.

1; Extension telephones 2 and 3 during a call; Extension telephone 4 that is not busy in the vicinity; Call destination terminal (extension telephone)
5; telephone control device 6 according to the present invention; telephone networks 101, 201, 301, 401; handsets 102, 202, 302, 402; handsets 103, 203, 303, 403; transmitters 111, 211, 311, 411; Interface units 112, 212, 312, 412; control units 113, 213, 313, 413; key / hook switch state detection units 114, 214, 314, 414; received voice reproduction units 115, 215, 315, 415; Transmission unit 511; speech path switch 512; control unit 513; terminal installation location / state storage unit 515; noise component cancellation unit 516; noise component processing unit A
517; noise component processing section B
521 to 524; extension interface unit 531; outside line interface unit V1; transmission voice V2; reception voice N1; ambient noise V5001 to V5008; installation location information and telephone status for each extension telephone

Claims (3)

A telephone control device that accommodates an external line and an internal line and controls a plurality of internal telephones connected to the internal line,
One of the plurality of extension telephones that is not in a call is selected, voice input means included in the selected extension telephone is activated, and ambient voice collected by the voice input means is used as an ambient noise signal. Ambient noise signal receiving means for receiving from the extension telephone as
Ambient noise canceling means for adjusting the amplitude or phase of the ambient noise signal received by the ambient noise signal receiving means, and canceling the ambient noise signal component from the transmitted voice signal received from the extension telephone in communication. Have
A telephone control apparatus having an ambient noise canceling function, wherein a transmitted voice signal from which a component of the ambient noise signal is canceled is transmitted to a communication partner of an extension telephone during the call. The telephone control device according to claim 1,
Installation location storage means for storing information relating to installation locations of the plurality of extension telephones;
When there are a plurality of extension telephones that are not in a call, the ambient noise signal receiving means refers to the installation location storage means and selects an extension telephone that is not in a call that is closest to the extension telephone that is in a call. A telephone control apparatus having an ambient noise canceling function, wherein an ambient noise signal is selected and received from the selected extension telephone. The telephone control device according to claim 1,
When there are a plurality of extension telephones that are not in a call, the ambient noise signal receiving means receives a plurality of ambient noise signals from a plurality of extension telephones that are not in a call,
The ambient noise canceling unit adjusts the amplitude or phase of a plurality of ambient noise signals received by the ambient noise signal receiving unit and executes predetermined arithmetic processing, and a common ambient noise component included in the plurality of ambient noise signals A telephone control apparatus having an ambient noise canceling function, wherein the common ambient noise component is canceled from a transmitted voice signal received from the extension telephone during a call.

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