JP2855805B2 - Malfunction Prevention Method for Speech Recognition Telephone - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a malfunction prevention method for a voice recognition telephone, and more particularly to a malfunction prevention method for a ringing tone (ring tone).

(Prior Art) In recent years, various devices have been devised to improve ease of use of telephones. For example, on-hook dial function, abbreviated dial function, and redial function are widely used as functions for improving ease of making a call. As a telephone with improved ease-of-use during a call, there is a hands-free telephone that allows a conversation without a handset.

Recently, voice dial telephones have been developed in which a telephone number corresponding to the name of the other party is stored in advance, and the handset is picked up and the call is made simply by calling the name of the other party. As described above, voice confirmation telephones to which dialing and telephone operations can be performed by voice are being actively developed. However, a voice recognition telephone that can perform various operations with a voice input from a microphone using a hands-free call function has not been commercialized.
FIG. 2 shows the configuration of a general voice recognition telephone. In FIG. 2, 1 is a diode bridge, 2 is an incoming circuit, 3
Is a buzzer, 4 is a diode bridge, 5 is a control circuit and a dial circuit, 6 is a communication circuit, 7 is a voice confirmation circuit, 8 is a speaker, 9 is a microphone, 10 is a handset, 11 is a capacitor, and 12 is a resistor.

Hereinafter, a method of performing various operations with a voice input from the microphone 9 will be described with reference to FIG.

In the example of FIG. 2, the voice for voice confirmation is the following 2
Route input is conceivable.

Input from the transmitter of the handset 10 during a handset call (handset voice route A) Input from the hands-free microphone 9 during a hands-free call (handsfree voice route B) Input voice from either of these two routes The speech recognition circuit 7 analyzes the content and outputs a recognition result to the control circuit and the dial sending circuit 5. The control circuit and the dial sending circuit 5 output a control signal for an operation indicated by the recognition result, and can operate the telephone by voice.

(Problems to be Solved by the Invention) However, in the device having the above-described configuration, when an incoming call is received, the voice command for answering the incoming call (off-hook, speaker reception, hands-free call operation, etc.) is not shown in FIG. The input cannot be made unless from hands-free voice route B. This is because off-hook and button operation are not voice commands.

Now, when the ringing tone is sounding, the ringing tone also circulates to the hands-free call microphone 9 for receiving a voice command and is input to the voice recognition circuit 7. At this time, even if the control command is issued, the ringing tone is blocked (masked) even if the control command is issued, and the voice recognition circuit 7 monitors the ambient noise.
In this case, there is a problem that it becomes difficult to receive a voice command because the ambient noise learning value is increased.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a conventional problem, to eliminate interference of voice command input due to a ring tone, and to prevent a malfunction in a voice recognition telephone capable of smoothly inputting a voice command even during ringing. Is to provide.

(Means for Solving the Problems) In order to achieve the above object, a malfunction prevention method in a voice recognition telephone according to the present invention is directed to a voice recognition telephone having a microphone, a speaker, a control means, and a communication circuit for a hands-free call. An incoming call detecting circuit for detecting an incoming call, a incoming call sound generating circuit connected to the control means for generating an incoming call sound, and an incoming call sound generated from the speaker disposed between the call circuit and the microphone and speaker. And an echo canceller circuit for canceling an echo from the microphone. The control means, when receiving an incoming call detection signal from the incoming call circuit, transmits the incoming call detection signal to the incoming call sound generation circuit, A sound is generated, and a speaker is sounded through the echo canceller circuit, and an echo of a ringtone output from the speaker is input from the microphone. In this case, the echo canceller circuit cancels the echo of the ring tone, thereby preventing a malfunction in voice recognition during a hands-free call.

(Operation) In the present invention, when receiving the incoming call detection signal from the incoming call circuit, the control means transmits the incoming call detection signal to the incoming call sound generation circuit to generate a incoming call sound, and the echo canceller When the speaker sounds through the circuit and the echo of the ring tone output from the speaker is input from the microphone, the echo of the ring tone is canceled by the echo canceller circuit, so that the voice during a hands-free call is cancelled. Prevent malfunction of recognition.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram for explaining a malfunction prevention method in a voice recognition telephone according to an embodiment of the present invention. This shows a configuration block of a voice recognition telephone to which a circuit for preventing a malfunction at the time of voice input by a microphone is added. In the figure, HF indicates a hands-free call, and HS indicates a handset call.

In FIG. 1, 1 and 4 are diode bridges, 5 is a control circuit and a dial sending circuit, 6 is a communication circuit, 7 is a voice recognition circuit, 8 is a speaker, 9 is a microphone, 10 is a handset, 11 is a capacitor, and 12 is Resistor, 21 is an incoming call detection circuit, 22
Is a ring tone generating circuit, 23 is an echo canceller circuit, L ₁ and L ₂
Is an input / output terminal.

It is connected to an exchange (not shown) having input / output terminals L ₁ and L ₂ . A signal from an exchange (not shown) passes through the diode bridge 4, the resistor 12, and the capacitor 11, and is input to the diode bridge 1. The signal (call signal) rectified by the diode bridge 1 is input to the incoming call detection circuit 21. When the incoming call detection circuit 21 detects an incoming call, it sends an incoming call detection signal to the control circuit and the dial sending circuit 5.

On the other hand, the signal rectified by the diode bridge 4 is input to the communication circuit 6. The communication circuit 6 includes a handset 10, an echo canceller circuit 23, and a speech recognition circuit 7.
Is connected. Listening input of echo canceller circuit 23
The R _IN, and the reception signal from the speech circuit 6, the incoming sound signal from the ring tone generating circuit 22 is inputted, the receiving output R _OUT,
The speaker 8 is connected. Echo canceller circuit 23
The of the transmission input T _IN, microphone 9 for handsfree is connected, sending the output T _OUT is connected to the speech circuit 6.
Further, the voice recognition circuit 7 analyzes the transmission signal from the communication circuit 6 and outputs the result to the control circuit and the dial transmission circuit 5. Note that the echo canceller circuit 23
Even if the audio signal input from R _IN goes from the speaker 8 to the microphone 9 and is input to the transmission input T _IN , the operation is canceled internally and is not output from the transmission output T _OUT .

Now, when a calling signal is input from an exchange (not shown) to the input / output terminals L ₁ and L ₂ , the incoming call detection circuit 21 detects the incoming call and outputs an incoming call detection signal to the control circuit and the dial sending circuit 5. I do. When receiving the incoming call detection signal, the control circuit and the dial sending circuit 5 control the incoming call sound generating circuit 22 to generate an incoming call sound signal. This ringing tone signal sounds as audible sound from the speaker 8 through the echo canceller circuit 23. On the other hand, the ring tone signal acoustically diverted from the speaker 8 to the microphone 9 is transmitted to the transmission input T
_{The signal} is input to _IN , but is not output to the transmission output T _OUT because it is canceled inside the echo canceller circuit 23.
Therefore, even if the voice command is issued while the ring tone is sounding, the ring tone does not interfere.

(Effects of the Invention) As described above, according to the present invention, even when a voice recognition telephone generates a voice command at the time of an incoming call, a voice recognition operation can be performed without being disturbed by a ring tone.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a malfunction prevention method in a voice recognition telephone according to an embodiment of the present invention, and FIG. 2 is a diagram for explaining a conventional example. 1,4 ... Diode bridge, 5 ... Control circuit and dial sending circuit, 6 ... Talking circuit, 7 ... Speech recognition circuit, 8 ... Speaker, 9 ... Microphone, 10 ... Handset, 11 ... Capacitor , 12 ... resistance, 21 ... incoming call detection circuit, 22 ... ringtone generation circuit, 23 ... echo canceller circuit.

Claims (1)

(57) [Claims] 1. A voice recognition telephone having a microphone, a speaker, a control means, and a communication circuit for a hands-free call, an incoming call detection circuit for detecting an incoming call, and a ring tone generated by the control means for generating a ring tone. A circuit, and an echo canceller circuit disposed between the communication circuit and the microphone and the speaker to cancel an echo from the microphone of a ring tone generated from the speaker. When an incoming call detection signal is received from the speaker, the incoming call detection signal is transmitted to the ring tone generation circuit, a ring tone is generated, a speaker is sounded through the echo canceller circuit, and the incoming call output from the speaker is output. When a sound echo is input from the microphone, the echo of the ring tone is canceled by the echo canceller circuit, so that the echo is canceled. A malfunction prevention method for a speech recognition telephone characterized by preventing malfunction of speech recognition during a free call.