JPS6083431A - Voice press-to-talk device - Google Patents

Abstract

PURPOSE:To prevent a device from being reset into a reception mode even when there is a pause in speech by providing a voice recognizing means which identifies plural specific terms and generates an output, and controlling a transmission and a reception mode corresponding to the terms. CONSTITUTION:A voice recognizing device 28 operates when receiving a voice input from an analog switch 27, and when a word coincident with one of voice patterns registered corresponding to several kinds of predetermined term in two groups is inputted, the device recognizes the word and generates an output. A photocoupler 29 when receiving the discrimination output of the device 28 turns on to generate a transmission/reception changeover pulse at its output side. The output side of the photocoupler 29 is connected to a press-to-talk switch 23 in parallel, and the controller 21, therefore, inverts the transmission/reception changeover signal on receiving the pulse similarly to the operation of the press- to-talk switch 23.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a voice breathtalk device that uses voice recognition to switch between transmission and reception in a wireless device or the like.

Prior Art and Problems In communication devices such as amateur radios or personal radios that are comprised of half-duplex transceivers, communication is performed in one-way communication mode, so communication is performed while switching between transmitting mode and receiving mode. There is a need to do. Conventionally, such switching between transmission and reception modes has often been performed manually using a breath-talk switch provided on a microphone, handset, or the like.

However, in the case of an in-vehicle radio, especially when it is desired to communicate while the vehicle is running, manual operation of the breath talk switch is dangerous and cannot be performed. Therefore, it is desirable to be able to perform the prestoring operation without manual intervention.

Conventionally, for such purposes, a voice control method has been widely used in which transmission and reception are switched depending on the presence or absence of voice. However, since the voice control system switches between transmission and reception by simply determining the presence or absence of transmitted voice, there is a problem in that the voice control system switches to reception mode as soon as speech breaks even during a conversation. Therefore, it is necessary to transmit calls continuously without interrupting the sound.
This is mentally stressful and poses a problem in terms of driving safety, especially in the case of vehicle-mounted radios. Furthermore, switching between transmission and reception due to voice detection involves a slight time delay, which tends to cause so-called interruptions at the beginning of speech. Particularly in the case of a personal radio, a group code of about 12 seconds is transmitted at the beginning and end of transmission, so there is a problem in that the beginning of the conversation is cut off to a large extent, making it difficult to understand the contents of the call.

OBJECT OF THE INVENTION The present invention is intended to solve the problems of the prior art as described above. To provide a voice breathtalk device that does not have the risk of returning to a receiving mode even if the middle voice is interrupted, and does not cause disconnection at the beginning of speech.

Embodiment of the Invention FIG. 1 shows the configuration of an embodiment of the voice breathtalk device of the present invention, together with the configuration of a personal radio to which it is applied. In the same figure, 1 is a microphone, 2 is an amplifier, 3 is a pre-emphasis circuit, and 4 is an IDC.
circuit, 5 is an amplifier, 6 is a PLL synthesizer, 7 is a transmission/reception switching circuit, 8 is a transmitter, 9 is a power amplifier, 10 is an AP
C circuit, 11 is an antenna switch, 12 is a low-pass filter, 13 is an antenna, 14 is a receiving section, 15 is a first intermediate frequency amplifier, 16 is a second intermediate frequency amplifier, 17 is a discriminator, 18 is a low frequency amplifier, 19 is a speaker,
20 is a keyboard, 21 is a controller, 22 is a group code display, 23 is a breath talk switch, 24 is a bandpass filter, 25 is an amplifier, 26 is a one-shot multi, 27 is an analog switch, 28 is a voice recognition device, 2
9 is a photocoupler.

Further, FIG. 2 shows signals of various parts in FIG. 1, and particularly explains the operation of the voice breathtalk device of the present invention. In the same figure, ■ is the output of the filter 24, ■ is the output of the amplifier 25, and ■ is the one-shot multi 2
6, ■ is the operation of the Ana Cog Suit f2B, ■ is the operation of the voice recognition device 28, and ■ is the transmission/reception switching pulse, and these are indicated by the same numbers at corresponding positions in Fig. 1. .

In the transmission mode, the audio input from the microphone 1 (see Figure '2) is amplified as required by the amplifier 2, and then applied to the pre-emphasis circuit 2 to perform the pre-emphasis necessary for FM modulation according to predetermined characteristics. The signal is then subjected to instantaneous total suppression control in the IDC circuit 4, and is applied to the amplifier 5 to receive the required amplification. PLL
The synthesizer 6 has a voltage controlled oscillator (VCO), and when the output of the amplifier 5 is applied as a control voltage, it generates a high frequency signal that is frequency modulated according to the audio input. When the transmitting/receiving switching circuit '7 is switched to the transmitting state, this signal is applied to the transmitting section 8 via this, where it undergoes the required amplification, and is further amplified by the power amplifier 9 to a predetermined output level.

The APCl path 10 detects the output level of the power amplifier 9 and controls the output level of the power amplifier 9 to be maintained at a predetermined value by, for example, controlling the base bias of the output transistor in the power amplifier 9. . When the antenna switch 11 is switched to the transmitting state, the output of the power amplifier 9 is applied to the low-pass filter 12 to remove harmonic components, and then sent to the antenna 16.
supplied to

(In the H mode, the reception input to the antenna 13 is applied to the reception unit 14 via the low-pass filter 12 and the antenna switch 11 which is switched to the reception state, where it is high-frequency amplified and then sent to the first intermediate frequency amplifier 15.
added to. The output of the PLL synthesizer 6 is applied to the first intermediate frequency amplifier 15 as an a-cal signal when the PLL synthesizer 6 and the transmission/reception switching circuit 7 are switched to the receiving state, and this and the output of the built-in crystal oscillator are applied to the first intermediate frequency amplifier 15. The received signal is converted to a first intermediate frequency by
receive the required amplification. The second intermediate frequency amplifier 16
A crystal oscillator output containing an intermediate frequency signal generates a second
The signal is converted to an intermediate frequency and further amplified.

The discriminator 17 demodulates the second intermediate frequency signal and reproduces the audio signal, and this signal is amplified as required in the low frequency amplifier 18 and then supplied to the speaker 19.

The frequency to be used for transmission and reception is designated by a group code on the keyboard 20. The controller 21 thereby displays the group code on the group code display 22, determines the frequency division ratio N for each transmission/reception state in the PLL synthesizer 6 according to the specified group code, and transmits this to the PLL synthesizer B. Output.

When the PLL synthesizer 6 receives a frequency division ratio designation from the controller 21, it synthesizes a carrier wave signal using a phase locked loop (PLL) based on a fixed frequency signal from a built-in crystal oscillator. The frequency of the carrier wave differs between transmitting and receiving, and is configured to be a transmitting carrier wave during transmitting and a receiving local signal during receiving.

A breath talk switch 23 is connected to the keyboard 20, and each time it is turned on, a transmission/reception switching pulse is output, and the controller 21 inverts the transmission/reception switching signal every time a pulse is input, thereby switching between transmission mode and reception mode. will be held. The breath talk switch 26 is usually provided integrally with the microphone 1.

The audio signal output from the amplifier 2 passes through a bandpass filter 24 to remove noise in the high and low ranges (FIG. 2). The amplifier 25 amplifies and clips the audio signal from the bandpass filter 24 to a saturation region, and further smooths it with a fixed time constant using a built-in integration circuit. Therefore, the output of the amplifier 25 is a signal that is at a high level while audio is being input, and becomes a low level when the audio is no longer present (FIG. 2).

The one-shot multi 26 is triggered by the rising edge of the output (2) of the amplifier 25, and generates a pulse having a width of a certain time (T seconds) ((2) in FIG. 2). The analog switch 27 is turned on when the pulse of the one-shot multi 26 is applied (Fig. 2 (excellent)).
passes only the first part of the speech for 1 second in the audio input,
input to the speech recognition device 28;

The voice recognition device 28 operates when it receives voice input from the analog switch 27 (Fig. 2 ■), but when the voice magazine 1fil
When the i-device 28 receives a word that matches a pattern in which voice patterns corresponding to several predetermined terms consisting of two groups are registered, it identifies this and generates an output. When the photocoupler 29 receives the identification output from the voice recognition device 28, it is turned on and generates a transmission/reception switching pulse (2) on its output side. The output side of the photocoupler 29 is connected in parallel with the breath switch 26, so when the controller 21 receives a pulse, it inverts the transmission/reception switching signal in the same way as when the breath talk 26 is operated.

Terms (keywords) to be registered in the voice recognition device 29 include, for example, words such as "yes" or "understood" that are normally used to notify the other party of the start of transmission as the first group, and words such as "yes" or "understood" that are usually used to notify the other party of the start of transmission, and words as the second group. Words such as "please" that are used to signal the end of a message can be used, and the operator can use the breathtalk switch by saying these words in the first second of the message. The transmission/reception mode can be switched in the same way. However, it is preferable that the second group of terms such as "please j", which indicates the end of transmission, be pronounced some time after the end of the transmission in order to ensure that the one-shot multi 26 operates correctly.

In FIG. 1, it goes without saying that if the controller 21 is constructed so that it can be operated directly by the identification output of the voice recognition device 2B, switching between transmission and reception can be performed without using the photocoupler 29.

As described in detail, according to the voice talk device of the present invention, a pulse of a certain length is generated by the rising edge of a transmitted message, and when this pulse is generated, a plurality of specific words in the back door are generated. is identified by a speech recognition device and output is generated, and when an identification output based on a term of the first group is generated, control is performed to set the transmission mode, and when an identification output based on a term of the second group is generated. Since the system instantly controls the reception mode, it is possible to switch between the transmitter and the receiver mode by voice without requiring manual BreathTalk operation. This is very effective because there is no risk of returning to the listening mode and there is no disconnection at the beginning of the conversation.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the voice breathtalk device of the present invention, and FIG. 2 shows the signals of each part in FIG. 1. FIG. DESCRIPTION OF SYMBOLS 1...Microphone, 2...Amplifier, 6...Pre-emphasis circuit, 4...IDC circuit, 5...Amplifier, 6...PLL synthesizer, 7...Transmission/reception switching circuit, 8. ...Transmission section, 9...Power amplification section, 10.
・・APC circuit, 11・・Antenna switch, 12・
...Low pass filter, 16...Antenna, 14...
・Reception section, 15...94S1 intermediate frequency amplifier, 16.
...Second intermediate frequency amplifier, 17...Discriminator, 18...Low frequency amplifier, 19...Speaker, 2
0...Keyho 1', 21...Control O-La, 22
...Group code display, 23...Breath talk switch, 24...Pando pane filter, 25...Amplifier, 26...One shot multi, 27...Analog switch, 28...Audio Recognition device, 29... photocoupler

Claims (1)

[Claims] In a half-duplex type transmitting/receiving device that includes a transmitting section and a receiving section and switches the transmitting/receiving mode by a breathtalk operation, means for generating a pulse of a certain length of time triggered at the rising edge of a transmitted message, and generating the pulse. and a voice recognition means that identifies a plurality of specific terms in the speech and generates an output, and when an identification output based on the terms of the first group is generated, the mode is set to transmission mode, and an identification output using the terms of the second group is provided. 1. A voice breathtalk device characterized in that a transmitting/receiving device is controlled to enter a receiving mode when this occurs.