JPS6227720B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a voice recognition device used when controlling electrical equipment by voice.

The applicant of this patent has already proposed in Japanese Patent Application No. 55-62136 a device that can remotely control the ON/OFF of gate lights, coolers, electric kettles, etc. using telephone lines. The outline is shown in Fig. 1. In the figure, 1 is an answering machine connected to telephone line 2,
Existing answering machines will be used. 3 is an audio circuit connected to the telephone line 2 via the answering machine 1 and controlling the operation of the answering machine 1;
The main components are a speech recognition section 4 and a speech synthesis section 5. Reference numeral 6 denotes electrical equipment such as lights, coolers, and electric kettles that are controlled by commands from this audio circuit 3. Specifically, ON/OFF control of a power switch 8 between this electrical equipment 6 and a power source 7 is controlled. This applies. The above-mentioned answering machine 1 includes a transmitter/receiver 9,
A control switch 10 is provided which connects and disconnects the telephone line 2 and the audio circuit 3 in response to commands from the transmitter/receiver 9. Furthermore, a transmitter/receiver 11 is connected to the transmitter/receiver 9. It's on.

When a family member wants to turn on or off the gate light or air conditioner in his/her home, he/she calls his/her home from the home, closes the control switch 10 based on the function of the answering machine 1, and listens to the family's voice. For example, "Light on" is transmitted to the voice recognition unit, and it is compared with the registered voice that has been registered in advance.
When it recognizes "on", it turns on the power switch 8 and connects the power source 7 and the electrical equipment 6 corresponding to the gate light. At the same time, when "Light On" is correctly recognized, the speech synthesis section 5 emits "Light On" to confirm to the family member who is away from home via the telephone line 2 that the "Light On" has been correctly recognized.

Such devices can be used to turn on various electrical devices from outside,
Since OFF control is possible, it is considered to be extremely useful for households where the user is often away.

However, if someone other than the family member gives a command such as "cooler on" as a prank, the voice recognition unit 4 detects that the voice is similar to the voice of the registered family member.
There were times when I recognized the voice as a command from a family member and actually turned on the air conditioner.

The present invention is aimed at preventing such malfunctions, and will be described in detail with reference to FIG. 2 and subsequent figures.

FIG. 2 is a block diagram showing an example of the apparatus of the present invention, in which reference numeral 20 is a microphone for converting sound into an electrical sound signal, and 21 is a microphone 20.
an amplifier for amplifying the audio signal from 22, 23,
24 is a zero cross detection circuit for detecting zero cross from the audio signal amplified by this amplifier 21;
Audio spectrum extraction circuit for extracting audio spectrum; audio area detection circuit for detecting audio area; 25
is the A/D connected to these circuits 22, 23, 24.
conversion and analog switch; 26 is a storage device for pre-registering voices necessary for voice recognition; 2;
Reference numeral 7 is a voice recognition circuit that detects the similarity between the voice registered in advance in the storage device 26 and the voice from the microphone 20 and performs a comparative recognition. outputs a control signal for controlling ON/OFF of the controlled electrical equipment 28, 28... Reference numerals 29, 29, . . . are result storage circuits that receive a control signal based on the recognition result of the recognition circuit 27 and store its state. Controlled electrical equipment 28,
ON/OFF of 28... is controlled. Reference numeral 30 denotes a code switch whose contents can be arbitrarily set. For example, numbers from 0 to 9 or alphanumeric characters are used, and a code of about 3 digits or 3 characters is usually set. Reference numeral 31 denotes a code memory for storing the recognized code signal obtained from the voice recognition circuit 27, and has a storage capacity of the same number of digits or characters as the code set by the code switch 30. 32 is the coded signal stored in the coded memory 31 and the coded switch 30.
A comparison circuit that compares the code set in 32, and when the two match in this comparison circuit 32, the
The gate circuit 33 provided between the conversion and analog switch 25 and the voice recognition circuit 27 is opened to transmit the voice signal to the recognition circuit 27. Conversely, if the two do not match, the gate circuit 33 is closed and the voice signal is transmitted to the recognition circuit 27. Prohibit audio signals.

FIG. 3 shows an encryption switch 30 and an encryption memory 31.
An example of the principle of the comparison circuit 32 is shown.
In order to simplify the explanation, FIG. 3 shows a case where a one-digit number is used as a code and the number is input as a code of 1, 2, 4, or 8. 34... are input switches forming the encryption switch 30, respectively.
The weights are 1, 2, 4, and 8. For example, when the cipher is set to "6", switches 2 and 4 are turned on. 35... is a 4-bit flip-flop circuit that constitutes the encryption memory 31,
As in the case of the input switch 34, respectively, 1,
The weighting is 2, 4, 8. This flip-flop circuit 35... has a voice recognition circuit 2.
The coded signal recognized in step 7 is input. This code signal is transmitted to the voice recognition circuit 27 by inputting a predetermined code by voice into the microphone 20.
Recognize the code and convert the recognition result into 1, 2,
This is the code converted to 4, 8, etc. 36...
... is each input switch 34 of the encryption switch 30...
and each flip-flop circuit 35 of the cryptographic memory 31
This is a logic gate that performs an exclusive OR with . In this Figure 3, we have explained the case where the code is a one-digit number, but to ensure completeness, it is preferable to use a combination of three digits or three characters, and the input switch can also be used as a digital key without using a coded key. It is also conceivable to use a coded signal by attaching an encoder.

Let us now consider the case where the microphone 20 is used to give a voice command such as "cooler on" to turn on the power to the cooler. Prior to this command, the code set in advance by the code switch 30, in this case "6", is uttered into the microphone 20. This "6" is an amplifier 21, a zero cross detection circuit 22, and an audio spectrum extraction circuit 2.
3. The voice signal is introduced into the voice recognition circuit 27 via the voice area detection circuit 24, A/D conversion and analog switch 25, and the voice signal at that time is recognized as "6" from the coded numeral registered in advance in the storage device 26. ,
Based on the result, "6" is encoded and sent to the encryption memory 31. Therefore, since the cipher introduced into the cipher memory 31 and the cipher set by the cipher switch 30 match, the comparison circuit 32 operates,
The gate circuit 33 is kept open. In this state, when "Cooler On" is introduced from the microphone 20, the voice recognition circuit 27 compares the voice with the registered voice previously registered in the storage device 26.
As a result of comparing the "Cooler On" obtained at this time with the pre-registered "Cooler On" and recognizing that they are the same, the voice recognition circuit 27 inputs the result memory provided corresponding to the cooler 28'. circuit 2
A control signal is sent to the circuit 9', and the circuit 29' is set, for example, to start energizing the cooler 28'.

On the other hand, even if a person who does not know the code set by the code switch 30 tries to energize the cooler, the comparison circuit 32 cannot find a match between the set code and the code input by voice input, so the gate circuit 33 will not open and recognition will occur. Further recognition operations in circuit 27 are prohibited. Of course, after a certain period of time has passed, the gate circuit 33 is opened again.
The state is such that it can handle the next cryptographic verification.

FIG. 4 shows another embodiment of the present invention, which differs from the embodiment of FIG. 2 in the position of the gate circuit 33. In this embodiment, the gate circuit 33
The voice recognition circuit 27 and the result storage circuits 29, 29...
..., and the gate circuit 33 is opened only when the comparison circuit 32 finds a match between the two codes as a result of code verification, and the recognition result from the voice recognition circuit 27 is guided to the result storage circuit 29. be.

Before recognizing the voice, a preset code is introduced into the voice, and only when a match is found as a result of comparing the two, the subsequent input voice is recognized. If the present invention is adopted for remote control of electrical equipment via a line, its usefulness will be particularly remarkable.

As is clear from the above description, the present invention detects a match between a preset code prior to voice recognition and a code introduced by voice, and prohibits the voice recognition operation unless the two codes match. Otherwise, the output of the recognition result is prohibited, so unless the user knows the code that precedes speech recognition, speech recognition becomes virtually impossible, and malfunctions can be completely prevented. Therefore, when the device of the present invention is used for remote control of electrical equipment in the home using a telephone line, undesired power-on, etc. due to mischief or the like can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an already proposed device, FIG. 2 is a block diagram of the device of the present invention, FIG. 3 is a block diagram of its main parts, and FIG. 4 is a block diagram of another embodiment of the device of the present invention. 27 is a voice recognition circuit, 30 is a code switch, 31 is a code memory, 32 is a comparison circuit, and 33 is a gate circuit.

Claims (1)

[Claims] 1. A speech recognition device that recognizes input speech by comparing it with pre-stored registered speech, which includes: a mechanical-electrical conversion device that converts speech into an electrical signal; A voice recognition circuit that compares and recognizes the registered voice that is registered, a cryptographic switch that can be set arbitrarily, a cryptographic memory that stores the recognized cryptographic signal obtained from the voice recognition circuit, and a configuration state of the cryptographic switch and the cryptographic memory. a comparison circuit for comparing the content, and means for controlling whether or not the voice recognition operation is necessary according to the comparison result output of the comparison circuit,
Prior to the voice recognition operation, a voice corresponding to the code set by the code switch is input, this coded voice is recognized by the speech recognition device and stored in the code memory, and the contents of this memory and the code set by the code switch are input. A voice recognition device is characterized in that it compares a code with a code in a comparison circuit and performs subsequent voice recognition operations only when a match is found. 2. In a speech recognition device that recognizes input speech by comparing it with pre-stored registered speech, a mechanical-electrical conversion device that converts the speech into an electrical signal and the speech signal and the pre-registered registered speech are used. A comparison that compares and recognizes a voice recognition circuit, a cryptographic switch that can be set arbitrarily, a cryptographic memory that stores the recognized cryptographic signal obtained from the voice recognition circuit, and the setting state of the cryptographic switch and the contents of the cryptographic memory. a circuit, and means for inhibiting output of the voice recognition result in accordance with the comparison result output of the comparison circuit,
Prior to the voice recognition operation, a voice corresponding to the code set by the code switch is input, this coded voice is recognized by the speech recognition device and stored in the code memory, and the contents of this memory and the code set by the code switch are input. A speech recognition device that outputs a speech recognition result only when a match is found by comparing the speech recognition result with a code using a comparison circuit.