JP2781490B2 - Cordless telephone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone having a voice recognition function.

[0002]

2. Description of the Related Art Conventionally, there is a voice dialer as shown in FIG. 3 using a voice recognition function of a telephone. This voice dialer has a voice recognition unit 1 and a line connection unit 4. The voice recognition unit 1 has a built-in memory,
Standard patterns of a plurality of words are registered in this memory in advance. This standard pattern is a pattern of acoustic parameters extracted from a speech signal representing a representative speech waveform of each word. Further, telephone numbers are registered in the memory in association with the standard patterns of the plurality of words.
Note that the method of extracting / registering the standard pattern in the memory and the method of registering the telephone number are not directly related to the present invention and will not be described.

The above-mentioned voice dialer operates as follows to transmit a telephone number. That is, at the time of calling, the word associated with the telephone number is uttered by the speaker. Then, an audio signal representing an audio waveform generated by the utterance is input from the microphone (hereinafter simply referred to as a microphone) 2 to the audio recognition unit 1. Then, the speech recognition unit 1 creates a feature pattern including acoustic parameters extracted from the input speech signal, and matches this feature pattern with all the standard patterns registered in the memory.

[0004] Thus, the telephone number associated with the standard pattern exhibiting the closest matching distance is selected by the voice recognition unit 1, and a signal representing the selected telephone number is output to the line connection unit 4. Is done. Then, the telephone number is transmitted to the telephone line 5 by the line connection unit 4. Thus, the other party's telephone and the telephone line are connected by the voice dialer.

[0005] In recent years, cordless telephones comprising a master unit and a plurality of slave units have become widespread. As one method of realizing the above-mentioned voice dialer in this cordless telephone, there is the following method. That is, each of the master unit and each of the slave units has a speech recognition unit, and the result of recognition of the input speech by the speech recognition unit of the master unit is output to the direct line connection unit. On the other hand, the result of recognition by the voice recognition unit of the child device is wirelessly transmitted to the parent device and transmitted to the telephone line via the parent device.

[0006] As the second method, there is the following method. That is, the voice recognition unit is built only in the master unit. When a telephone number is transmitted from the base unit, the voice input from the microphone of the base unit is directly recognized by the voice recognition unit of the base unit, and a signal representing the telephone number obtained as a result of the recognition is transmitted to the line connection unit. Output. On the other hand, when calling a phone number from the above slave unit,
The audio signal output from the microphone of the slave unit is transmitted to the master unit by wireless communication. Then, the received sound is recognized by the voice recognition unit of the master unit, and the telephone number obtained as a result of the recognition is transmitted to the telephone line.

[0007]

However, the method for realizing the voice dialer in the cordless telephone as described above has the following problems. That is, in the above one method, each of the master unit and each of the slave units must have a voice recognition unit, which causes a problem of increasing the cost. Further, in the above two methods, when a telephone number is transmitted from the slave unit, an audio signal must be sent to the master unit by wireless communication, and noise specific to wireless communication is added to the audio signal. There is a problem that the S / N ratio is reduced and the recognition rate by the voice recognition unit is reduced.

In general, in narrow-band FM communication, a dynamic range is expanded by using a compander circuit (compressor circuit and expander circuit), and the SN ratio is increased.
Often we try to improve the ratio. Nevertheless, in the above two methods, a reduction in the recognition rate is inevitable for the following reasons. That is, the audio signal output from the microphone of the master unit is directly input to the audio recognition unit. On the other hand, the audio signal output from the microphone of the slave unit is input to the audio recognition unit of the master unit after passing through the compander circuit. Therefore, the audio signal input from the microphone of the master unit to the audio recognition unit and the audio signal input from the microphone of the slave unit to the audio recognition unit have different frequency characteristics.

Further, in the above narrow band FM communication,
By using a scramble circuit and a descrambling circuit, communication contents are encrypted to prevent eavesdropping by a third party. In this case, the audio signal output from the microphone of the master unit is directly input to the audio recognition unit, whereas the audio signal output from the microphone of the slave unit passes through the scramble circuit and the descramble circuit. It will be input to the voice recognition unit of the master unit later. Here, the frequency characteristic of the scramble circuit-descrambling circuit system is not flat as shown in FIG. Therefore, as in the case of using the compander circuit described above, the audio signal input from the microphone of the master unit to the audio recognition unit and the audio signal input from the microphone of the slave unit to the audio recognition unit have different frequency characteristics. is there.

That is, for example, when a word corresponding to a telephone number is registered in the memory, a representative voice is input from the microphone of the parent device, and a voice to be recognized is input from the microphone of the child device when transmitting. The frequency characteristics of the standard pattern and the characteristic pattern are different. Therefore,
The recognition rate decreases due to the difference in frequency characteristics between the two patterns. This is a strange phenomenon that when a person who has registered a word corresponding to a telephone number with a base unit uses a slave unit when making a call, the word is erroneously recognized despite being the same speaker. become.

[0011] This phenomenon similarly occurs when a person who has registered a word corresponding to a telephone number with a child device uses the parent device when making a call. In other words, this is a problem that always occurs when the telephone used for registration and the telephone used for calling are different.

An object of the present invention is to provide a cordless telephone capable of transmitting a correct telephone number to a telephone line by a voice dialer even if the telephone at the time of registration is different from the telephone at the time of calling.

[0013]

In order to achieve the above object, a cordless telephone according to a first aspect of the present invention is a cordless telephone having a compressor circuit and an expander circuit provided in each of a master unit and a slave unit for improving an SN ratio. In the telephone, the base unit recognizes the input voice and outputs a signal representing a telephone number corresponding to the recognition result to a line connection unit, and outputs the voice signal output from the compressor circuit to the extractor. It is characterized by comprising first switching means for switching and inputting to the panda circuit, and second switching means for switching and inputting the audio signal output from the expander circuit to the audio recognition unit.

A cordless telephone according to a second aspect of the present invention
In a cordless telephone provided with a scramble circuit and a descrambling circuit for preventing eavesdropping on each of a base unit and a child unit, a signal representing a telephone number corresponding to a recognition result by recognizing an input voice to the base unit. And a first switching unit for switching and inputting an audio signal output from the scramble circuit to the descramble circuit, and an audio recognition unit for outputting the audio signal output from the descramble circuit to the line connection unit. And a second switching means for switching input to the unit.

Further, a cordless telephone according to a third aspect of the present invention
In a cordless telephone provided with a compressor circuit and an expander circuit for improving the SN ratio in each of the parent device and the child device, and a scramble circuit and a descrambling circuit for preventing eavesdropping, a voice input to the parent device is provided. And a voice recognition unit that outputs a signal representing a telephone number corresponding to the recognition result to the line connection unit, and a voice signal path that has passed through the compressor circuit and the scramble circuit passes through the descramble circuit and the expander circuit. And a second switching means for switching and inputting the audio signal passed through the descramble circuit and the expander circuit to the audio recognition unit.

[0016]

According to the first aspect of the present invention, at the time of registration or transmission of the base unit, the first switching means is switched so that the audio signal output from the compressor circuit of the base unit is input to the expander circuit of the base unit. On the other hand, the second switching means is switched so that the audio signal output from the expander circuit of the master unit is input to the voice recognition unit. Then, the speech signal of the word input to the master unit is input to the speech recognition unit through the compressor circuit and the expander circuit of the master unit provided for improving the SN ratio.

On the other hand, at the time of registration of a slave unit or transmission of a slave unit, the second switching means is switched so that the audio signal output from the expander circuit of the master unit is input to the speech recognition unit. Then, the audio signal of the word input to the child device passes through the compressor circuit of the child device and the expander circuit of the parent device, and is input to the voice recognition unit.

Therefore, in any case of registration of the base unit, registration of the base unit, transmission of the base unit or transmission of the base unit, the voice signal of the uttered word is transmitted after passing through the compressor circuit and the expander circuit. This will be input to the voice recognition unit. Therefore, the voice recognition performed by the voice recognition unit is performed at a high recognition rate based on the standard pattern and the characteristic pattern having the same frequency characteristics.

In the second invention, at the time of registration or transmission of the base unit, the first switching unit is switched so that the audio signal output from the scramble circuit of the base unit is input to the descramble circuit of the base unit. On the other hand, the second switching means is switched so that the audio signal output from the descramble circuit of the master unit is input to the audio recognition unit. Then, the voice signal of the word input to the master unit passes through the scramble circuit and descramble circuit of the master unit provided for preventing eavesdropping, and is input to the speech recognition unit.

On the other hand, at the time of registration of a slave unit or transmission of a slave unit, the second switching means is switched so that the audio signal output from the descramble circuit of the master unit is input to the speech recognition unit. Then, the audio signal of the word input to the child device passes through the scramble circuit of the child device and the descrambling circuit of the parent device and is input to the voice recognition unit.

Therefore, the voice signal of the uttered word is transmitted after passing through the scramble circuit and the descrambling circuit in any of the registration of the master unit, the registration of the slave unit, the transmission of the master unit and the transmission of the slave unit. This will be input to the voice recognition unit. Therefore, the voice recognition performed by the voice recognition unit is performed at a high recognition rate based on the standard pattern and the characteristic pattern having the same frequency characteristics.

In the third invention, when registering the master unit or transmitting the master unit, the path of the audio signal passing through the compressor circuit and the scramble circuit of the master unit is changed to the path passing through the descramble circuit and the expander circuit of the master unit. While switching is performed by the first switching unit, the second switching unit is switched so that the audio signal that has passed through the descramble circuit and the expander circuit of the master unit is input to the audio recognition unit.
Then, the speech signal of the word input to the master unit passes through the compressor circuit, scramble circuit, descramble circuit, and expander circuit of the master unit and is input to the speech recognition unit.

On the other hand, at the time of registration or transmission of a child unit, the second switching means is switched so that the audio signal passing through the descramble circuit and the expander circuit of the parent unit is input to the audio recognition unit. Then, the audio signal of the word input to the child device passes through the compressor circuit and scramble circuit of the child device and the descramble circuit and expander circuit of the parent device, and is input to the voice recognition unit.

Therefore, the voice signal of the uttered word is supplied to the compressor circuit, the scramble circuit, the descrambling circuit and the extractor at any of the registration of the base unit, the registration of the base unit, the transmission of the base unit and the transmission of the base unit. After passing through the panda circuit, it is input to the voice recognition unit. Therefore, the voice recognition performed by the voice recognition unit is performed at a high recognition rate based on the standard pattern and the characteristic pattern having the same frequency characteristics.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. FIG. 1 is a block diagram of a cordless telephone according to the present embodiment, and a control unit, a key input unit, a voice synthesizing unit, and the like, which are not directly related to the description of the present invention, are omitted.
In the cordless telephone shown in FIG. 1, a voice recognition unit is provided on the master unit side, and communication between the master unit and the slave unit is based on narrowband FM communication via a compander circuit.

In the cordless telephone, an electronic switch 32 is provided between the compressor circuit 17 and the modulation circuit 18 in the base unit 11, while an electronic switch 33 is provided between the expander circuit 21 and the receiver 22. . The path of the audio signal can be switched by the electronic switches 32 and 33. That is, the electronic switch 32 and the path C constitute the first switching means, and the electronic switch 33 and the path B constitute the second switching means.

First, the case of a call using the cordless telephone will be described. In this case, under the control of the control unit (not shown), the electronic switch 32 is switched to the (A) side, while the electronic switch 33 is switched to the (C) side. During a call from the slave unit 12 to the master unit 11, the audio signal output from the microphone 24 of the slave unit 12 is frequency-compressed by the compressor circuit 25 and input to the modulation circuit 26. The signal is frequency-modulated by the modulation circuit 26, transmitted from the transmission / reception unit 27 to the antenna 31, and transmitted from the antenna 31 to the antenna 23 of the master unit 11.

The audio signal received by the antenna 23 of the base unit 11 is transmitted to the demodulation circuit 20 via the transmission / reception unit 19.
Is input to The signal is detected by the demodulation circuit 20, frequency-expanded by an expander circuit 21, and transmitted to a receiver 22. By the way, the above-mentioned slave unit 12
The path from the microphone 24 to the expander circuit 21 of the base unit 11 is hereinafter referred to as a path A.

Similarly, when a call is made from the master unit 11 to the slave unit 12, the audio signal output from the microphone 16 of the master unit 11 is frequency-compressed by the compressor circuit 17 and frequency-modulated by the modulation circuit 18; The signal is sent from the transmitting / receiving unit 19 to the antenna 23. The audio signal received by the antenna 31 of the slave unit 12 is detected by the demodulation circuit 28 via the transmission / reception unit 27, expanded in frequency by the expander circuit 29, and transmitted to the receiver 30.

Next, a case where a telephone number and a word corresponding to the telephone number are registered will be described. In this case, while the electronic switch 32 is switched to the (b) side,
The electronic switch 33 is switched to (d). When registering from the slave unit 12, the registered word is uttered toward the microphone 24 of the slave unit 12. Then, the audio signal relating to the registered word output from the microphone 24 and following the path A and reaching the expander circuit 21 of the master unit 11 is changed to the path B by the electronic switch 33 and the voice recognition unit 13
Is input to Then, the sound parameters of the input sound signal are extracted by the sound recognition unit 13, and the pattern of the extracted sound parameters is used as a standard pattern in association with the telephone number input from the key input unit or the like and the internal memory ( (Not shown). Note that the operation of extracting / registering the acoustic parameters (standard patterns) and the operation of registering the telephone number are not directly related to the present invention, and will not be described.

On the other hand, when registering from the base unit 11, the audio signal output from the microphone 16 of the base unit 11 and passing through the compressor circuit 17 is transmitted to the electronic switch 3
The path is changed to the path C side by 2 and input to the expander circuit 21. Then, the audio signal output from the expander 21 is input to the audio recognition unit 13 via the path B. As a result, the child device 12
In the same manner as when registering a standard pattern, a standard pattern based on the audio signal that has passed through the compressor circuit and the expander circuit is registered.

Next, the case of transmission will be described. Also in this case, the electronic switch 32 is switched to the (b) side, while the electronic switch 33 is switched to the (d) side. When making a call using the slave unit 12, the microphone 24 of the slave unit 12 is used.
Utters the word associated with the target telephone number toward. Then, the audio signal output from the microphone 24 is input to the audio recognition unit 13 of the parent device 11 by following the above-described paths A and B in the same manner as in the above-described registration.
Then, the audio parameters of the input audio signal are extracted by the audio recognition unit 13, and the extracted audio parameter patterns are matched with all the standard patterns registered in the internal memory as feature patterns. Is done.

Then, the telephone number associated with the standard pattern having the closest matching distance is selected by the voice recognition unit 13, and a signal representing the selected telephone number is input to the line connection unit 14. Further, the telephone number targeted by the caller is changed to the telephone line 1 by the line connection unit 14.
5 is sent. At this time, the characteristic pattern and the standard pattern both have the same frequency characteristics because they are generated based on the audio signal that has passed through the compressor circuit and the expander circuit. Therefore, a decrease in the recognition rate due to the difference in the frequency characteristics is prevented.

Thus, the telephone line and the telephone having the telephone number associated with the word uttered toward the microphone 24 of the slave unit 12 are connected.

On the other hand, when a call is made by the base unit 11, a word associated with a target telephone number is uttered toward the microphone 16 of the base unit 11. And microphone 1
6 is input to the voice recognition unit 13 via the compressor circuit 17, the path C, the expander circuit 21, and the path B in the same manner as in the case of the above-described registration. Then, the above-described matching is performed by the voice recognition unit 13 and the selected telephone number is input to the line connection unit 14.
Is transmitted to the telephone line 15 via the. Also at this time, the characteristic pattern and the standard pattern have the same frequency characteristics, and a decrease in the recognition rate due to the difference in the frequency characteristics is prevented.

In this way, the telephone line and the telephone having the telephone number associated with the word uttered toward the microphone 16 of the base unit 11 are connected.

As described above, in the present embodiment, the voice recognition unit is used regardless of whether the telephone is operated at the time of registration or transmission and whether the telephone operated at that time is the master unit 11 or the slave unit 12. The audio signal input to 13 is an audio signal that has passed through a compressor circuit and an expander circuit. Therefore, the frequency characteristics of all audio signals input to the audio recognition unit 13 are the same. That is, the frequency characteristics of the standard pattern and the characteristic pattern are the same.

Therefore, when the telephone at the time of registration and the telephone at the time of calling are different (parent unit registration / child unit transmission or child unit registration / parent unit transmission)
Can be prevented from being erroneously recognized due to the difference in the frequency characteristics.

FIG. 2 is a block diagram of a cordless telephone which performs communication between a master unit and a slave unit by narrowband FM communication via a scramble circuit and a descrambling circuit. In the cordless telephone shown in FIG. 2, basically, the compressor circuit of the cordless telephone shown in FIG. 1 is replaced by a scramble circuit, and the expander circuit is replaced by a descramble circuit. In FIG. 2, the same blocks as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The call between the master unit 11 and the slave unit 12 and the registration and transmission of the telephone number / word by the cordless telephone are carried out in the same manner as in the embodiment of the cordless telephone having the compander circuit described above. The following is a brief description.

In the case of a call from the slave unit 12 to the master unit 11, the audio signal output from the microphone 24 of the slave unit 12 is transmitted to the compressor circuit 2 of the path A in the above-described embodiment.
5 and the expander circuit 21 with the scramble circuit 43
The signal is transmitted to the receiver 22 of the parent device 11 by following a path replaced by the descrambling circuit 42 (hereinafter, this path is referred to as a path A ′). At that time, the scramble circuit 4
3, the audio signal is encrypted, and is decrypted by the descrambling circuit 42. On the other hand, in the case of a call from the base unit 11 to the handset 12, the microphone 16 of the base unit 11
Is output to the receiver 30 of the slave unit 12 via the scramble circuit 41, the modulation circuit 18, the reception unit 19, the reception unit 27, the demodulation circuit 28, and the descrambling circuit 44.

Next, when registering a telephone number and a word corresponding to the telephone number from the slave unit 12, the data is output from the microphone 24 of the slave unit 12 and traced along the path A ', and the data of the master unit 11 is registered. The voice signal of the registered word that has reached the scramble circuit 42 is input to the voice recognition unit 13 via the path B. On the other hand, when registering from the base unit 11,
The voice signal of the registered word output from the microphone 16 of the base unit 11 is input to the voice recognition unit 13 via the scramble circuit 41, the path C, the descramble circuit 42, and the path B. In this way, the standard pattern based on the audio signal that has passed through the scramble circuit and the descramble circuit is registered regardless of whether the registration is performed from the master unit 11 or the slave unit 12.

Next, when a call is made by the slave unit 12, the voice signal of the word corresponding to the target telephone number output from the microphone 24 of the slave unit 12 is transmitted through the route A 'and the route B. The information is input to the voice recognition unit 13 of the parent device 11 after tracing. On the other hand, when a call is made by the base unit 11, the base unit 1
The audio signal output from the first microphone 16 is transmitted to the scramble circuit 41, the path C, the descrambling circuit 42, and the path B.
Is input to the voice recognition unit 13 via the. Thus, regardless of whether the signal is transmitted from the master unit 11 or the slave unit 12, a characteristic pattern based on the audio signal that has passed through the scramble circuit and the descramble circuit is generated.

As described above, in the present embodiment, the voice recognition is performed regardless of whether the telephone is operated at the time of registration or transmission and whether the telephone operated at that time is the master unit 11 or the slave unit 12. The audio signal input to the unit 13 is an audio signal that has passed through the scramble circuit and the descramble circuit. Therefore, the frequency characteristics of all audio signals input to the audio recognition unit 13 are the same.

Therefore, when the telephone at the time of registration and the telephone at the time of calling are different (parent unit registration / child unit transmission or child unit registration / parent unit transmission)
Can be prevented from being erroneously recognized due to the difference in the frequency characteristics.

In each of the above embodiments, a compander circuit or a scramble / descramble circuit is provided independently. However, in the present invention, they can be provided together without any problem. In that case, for example, the scramble circuit is the compressor circuits 17 and 2 in FIG.
Immediately after step 5, the descrambling circuit may be provided immediately before the expander circuits 21 and 29 in FIG. And
The route corresponding to the route C in each of the above embodiments may be provided between the output terminal of the scramble circuit of the master unit and the input terminal of the descramble circuit of the master unit.

[0047]

As is apparent from the above description, the cordless telephone according to the first aspect of the present invention has the voice recognition unit, the first switching means and the second switching means in the base unit, and is used when the base unit is registered or the base unit is transmitted. By switching the first switching means and the second switching means, the voice signal of the word input to the master unit is input to the speech recognition unit through the compressor circuit and the expander circuit of the master unit, while the slave unit is registered or the slave unit is registered. The second switching means is switched at the time of transmission from the handset, and the voice signal of the word input to the handset is input to the voice recognition unit through the compressor circuit of the handset and the expander circuit of the base unit. The voice signal of the uttered word at the time of registration, at the time of registration of the slave unit, at the time of transmission from the base unit, or at the time of transmission from the slave unit, passes through the compressor circuit and the expander circuit, It is input. As a result, the voice recognition performed by the voice recognition unit is performed based on the standard pattern and the characteristic pattern having the same frequency characteristics.
Therefore, according to the present invention, the correct telephone number can be transmitted to the telephone line by the voice dialer even if the telephone at the time of registration and the telephone at the time of calling are different.

The cordless telephone according to the second aspect of the present invention
The master unit is provided with a voice recognition unit, a first switching unit, and a second switching unit, and switches the first switching unit and the second switching unit at the time of registration of the master unit or at the time of transmission of the master unit, so that a word inputted to the master unit is input. Is input to the voice recognition unit through the scramble circuit and the descramble circuit of the base unit, and the second switching means is switched at the time of registration of the base unit or at the time of transmission from the base unit, so that the voice of the word input to the base unit is output. Since the signal is input to the voice recognition unit through the above-described slave unit's scramble circuit and the master unit's descrambling circuit, any of the cases of master unit registration, slave unit registration, master unit transmission or slave unit transmission The speech signal of the uttered word is input to the speech recognition unit after passing through the scramble circuit and the descramble circuit. As a result, the voice recognition performed by the voice recognition unit is performed based on the standard pattern and the characteristic pattern having the same frequency characteristics. Therefore,
According to the present invention, the correct telephone number can be transmitted to the telephone line by the voice dialer even if the telephone at the time of registration is different from the telephone at the time of calling.

The cordless telephone according to the third aspect of the present invention
The master unit is provided with a voice recognition unit, a first switching unit, and a second switching unit, and switches the first switching unit and the second switching unit at the time of registration of the master unit or at the time of transmission of the master unit, so that a word inputted to the master unit is input. Is input to the voice recognition unit through the compressor circuit, scramble circuit, descramble circuit, and expander circuit of the base unit, and the second switching means is switched at the time of registration or transmission of the base unit, and The voice signal of the word input to the voice recognition unit is input to the voice recognition unit through the compressor circuit, the scramble circuit of the above-mentioned slave unit, the descramble circuit of the master unit, and the expander circuit. The voice signal of the uttered word is transmitted from the compressor circuit, scramble circuit,
After passing through the descrambling circuit and the expander circuit, it is input to the voice recognition unit. As a result, the voice recognition performed by the voice recognition unit is performed based on the standard pattern and the characteristic pattern having the same frequency characteristics.
Therefore, according to the present invention, the correct telephone number can be transmitted to the telephone line by the voice dialer even if the telephone at the time of registration and the telephone at the time of calling are different.

[Brief description of the drawings]

FIG. 1 is a block diagram of a cordless telephone according to an embodiment of the present invention.

FIG. 2 is a block diagram of an embodiment different from FIG.

FIG. 3 is a block diagram of a voice dialer.

FIG. 4 is a diagram illustrating an example of a frequency characteristic in a scramble circuit-descrambling circuit system.

[Explanation of symbols]

11: master unit, 12: slave unit, 1
3: Voice recognition unit, 14: Line connection unit, 15: Telephone line, 16, 24
... microphone, 17,25 ... compressor circuit, 1
8, 26 ... modulation circuit, 19, 27 ... transmission / reception unit,
20, 28: demodulation circuit, 21, 29: expander circuit, 22, 30, ... receiver, 41, 43 ... scramble circuit, 42, 44 ... descramble circuit.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ identification code FI H04B 7/26 109Q (58) Investigated field (Int.Cl. ⁶ , DB name) H04B 7/24-7/26 H04Q 7 / 00-7/38 H04M 1/00-1/57 G10L 3/00-9/20

Claims (3)

(57) [Claims] 1. A cordless telephone provided with a compressor circuit and an expander circuit for improving an SN ratio in each of a base unit and a slave unit, wherein the base unit recognizes input voice and responds to the recognition result. A voice recognition unit that outputs a signal indicating the telephone number to the line connection unit, a first switching unit that switches the voice signal output from the compressor circuit to the expander circuit, and a voice signal output from the expander circuit. A cordless telephone comprising a second switching unit for switching and inputting a voice signal to the voice recognition unit. 2. A cordless telephone provided with a scramble circuit and a descrambling circuit for preventing eavesdropping on each of a base unit and a slave unit, wherein the base unit recognizes an input voice and responds to the recognition result. A voice recognition unit that outputs a signal representing a telephone number to a line connection unit; a first switching unit that switches and inputs a voice signal output from the scramble circuit to the descramble circuit; a voice output from the descramble circuit A cordless telephone comprising a second switching unit for switching and inputting a signal to the voice recognition unit. 3. A compressor circuit and an expander circuit for improving an SN ratio in each of the master unit and the slave unit, and
In a cordless telephone provided with a scramble circuit and a descrambling circuit for preventing eavesdropping, the base unit recognizes the input voice and outputs a signal representing a telephone number corresponding to the recognition result to a line connection unit. A recognition unit; first switching means for switching a path of the audio signal passing through the compressor circuit and the scramble circuit to a path passing through the descramble circuit and the expander circuit; and audio passing through the descramble circuit and the expander circuit. A cordless telephone comprising a second switching unit for switching and inputting a signal to the voice recognition unit.