JP2748221B2 - Hands-free telephone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hands-free telephone device, and more particularly, to a hands-free telephone device applicable to an outside line (office line).

[0002]

2. Description of the Related Art In general, this type of hands-free telephone device has been characterized in that it is possible to answer and receive a call without using a hand, that is, without a handset. However, in the conventional device, it is necessary to once depress the button when an incoming call is received from an outside line. That is, when an incoming call is received, a response button is first pressed to perform the same functional operation as an off-hook (operation of lifting the handset). Then, the other party hears that the called party has answered, and asks "if, if". In response to this, "Yes, ○○○○." Is transmitted to the line, and while responding to the requirements of the other party, responding according to the contents.

[0003] On the other hand, conventionally, for example, a key telephone apparatus or the like adopts this function to automatically activate a hands-free answering function in a call between extensions instead of an outside line, thereby enabling a call between extensions. . Since this is an intercommunication between a limited number of peers, ie, extensions, there is no need to consider such things as not responding or avoiding a response, so that the system is configured to automatically enter the response operation. Then, in order to use an extension line having a stable line quality including the line level, it is possible to realize the technology by using a voice switch to reversibly switch between transmission and reception and to communicate with each other. It was possible to perform a relatively stable hands-free voice call.

On the other hand, the hands-free response function for an outside line is different from the automatic extension hands-free operation in a key telephone device or the like, and requires the button pressing operation as described above in the following points. Regarding incoming calls from outside lines, line levels, line noise, line impedance, etc. are different for each line in use because external lines deal with an unspecified number of people, and it is difficult to perform stable transmission / reception switching operation. However, since an outside line call is an unspecified number of calls, including strangers, the outside line may not answer, do not want to answer, or do not want to answer, depending on the situation. There are difficult times or time zones, and there is a problem in automatically configuring a hands-free answering operation for any incoming call. It was necessary to listen to the voice.

[0005]

[Problems to be solved by the invention] Therefore, in the case of an outside line incoming call, if such a button pressing operation is performed,
If bothersome, it would be the same to make a call using the handset, so it would naturally shift to handset only, resulting in the loss of the hands-free answering call function. was there.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-described conventional problem with respect to a response to an outside line (hereinafter, collectively referred to as a line) and to use a simple voice recognition technique.
It is an object of the present invention to provide a hands-free telephone device capable of selecting an automatic hands-free response operation without performing a push button operation, and conversely, selecting a non-response operation.

[0007]

According to a first aspect of the present invention, there is provided a telephone apparatus including a communication circuit and connected to a line. A transmitting means and a receiving means for performing a hands-free answering call, and ringing in response to an incoming signal from the line
During the pause time of any of the ring tones
The first and the first predetermined to be located at the beginning and the end between
Exceeds a predetermined input level within the second detection time
No noise is detected, and the first and second
A voice detection predetermined to be located in the middle of the detection time
Detected exceeding the predetermined input level within the delivery time
Audio signal input through the transmitting means
When it is detected that it is a speech signal in a given word
Control means for outputting hands-free response command information to the line, line closing means for forming a communication loop between the line and the communication circuit based on the hands-free response command information from the control means, Hands-free control means for forming a hands-free answering call loop by combining the calling circuit with the transmitting means and the receiving means based on the hands-free answering command information, and via a line without performing manual operation. It is unique in that it enables hands-free answering calls with the other party. In a second aspect of the present invention, the telephone device includes a main telephone configured to include a communication circuit and connected to a line,
A cordless telephone comprising a transmitting means and a receiving means for performing a hands-free answering call, and a cordless telephone for transmitting and receiving to and from the main telephone by using a radio wave as a medium to make a telephone call with the line ; It is characterized in that it is possible to make a hands-free answering call with the other party via a line in the same manner as described above.

[0008]

According to the present invention, when a call is received from a line, the user can depress a button by pressing a button in a simple configuration in which the user simply speaks in a predetermined language, for example, simply "Hi" to the telephone device. A hands-free call loop with the line can be automatically formed without performing any manual operation such as off-hook.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a circuit block diagram of a hands-free telephone device showing a first embodiment of the present invention, FIG. 2 is a partial circuit configuration diagram of FIG. 1, and FIGS. 3 to 5 are voice detection output waveform diagrams in the present invention. . FIG. 6 is a flowchart for explaining the operation of the control circuit of the device of the present invention, and FIG. 7 is a flowchart for explaining the operation of the hands-free control circuit of the device of the present invention. In the figure, reference numeral 1 denotes a telephone line connection terminal (L1
/ L2), 2 is a diode bridge for polarity matching, 3 is a transistor circuit for DC closing (line closing circuit), 4 is a speech circuit, 5 is a receiver, 6 is a transmitter, and 7 is a dial circuit. , 8 is a call termination detection circuit, 9 is a keyboard, 10 is a keyed interface (KBF), 11 is a hook switch, 12 is a DC cut capacitor, 13 is a rectifying diode bridge, 14 is a tone ringer circuit, and 15 is DC separation. Transformer, 16 is an incoming signal detection circuit, 17 is a speaker amplifier, 18 is a speaker (receiving means), 19 is a microphone (transmitting means), 20 is a microphone amplifier,
21 is a hands-free control circuit, 22 is a band-pass filter, 23 is a detector, 24 is a low-pass filter, 25 is a comparator, 26 is a control circuit (CPU), and 27 is an LED.
Display, 28 is a liquid crystal display, 29 is an external power supply input terminal (AC), 30 is a power supply circuit for operating each circuit, 31 is a power supply monitoring circuit (T relay), t is its contact point, and 32 is a power supply on / off control. The reset circuit outputs a reset signal to the circuit.

Next, a general circuit operation of the hands-free telephone device according to the present invention will be described with reference to FIGS. First, when power is input to the external power supply input terminal 29, the power supply circuit 30 operates to supply a required DC power supply (12V, 5V) to each circuit.
V, etc.). At the same time, the power supply monitoring circuit 31 also operates,
When the power monitoring relay T is activated and its contact t is energized, it is connected to the incoming signal detection circuit 16 side. When there is a call from an outside line (telephone office), the call signal is transmitted through a route of [telephone line connection terminal 1 → capacitor 12 → diode bridge 13 → tone ringer circuit 14] to obtain a ring tone output. This output is input to the incoming signal detection circuit 16 via the transformer 15 and the contact t. Tone ringer circuit 1
4 is converted into a direct current by the incoming signal detection circuit 16 and output to the control circuit 26. The control circuit 26 receives this output and determines that there is an incoming call (S1). An audio signal receiving mode is set so that an audio signal from the microphone 19 can be received based on the information indicating that there is an incoming call (S2), and a standby routine for state control is entered.

When the user goes off-hook (when the handset is raised and the hook switch 11 is operated), the control circuit 26 is turned off.
Detects the information (S3), activates the line closing circuit 3, forms a communication loop, that is, a DC loop for the telephone line (S4), and simultaneously detects the incoming signal detection circuit 16.
Is released (S5). This DC loop is connected to [Connection terminal 1 →
Diode bridge 2 → circuit closing circuit 3 → communication circuit 4]
And the mode shifts to the call mode (S6). The off-hook forming a call loop is a response call with a normal handset lifted. Thereafter, when the telephone call is terminated and the handset is put up, the information is taken into the control circuit 26 (S7), the line closing circuit 3 is made inoperative, and the DC loop is opened (S8), so that the state becomes the standby state (X). Transition.

Next, a response operation by the voice recognition technology of the present invention will be described. Conventional speech recognition devices recognize a plurality of words, perform a registration operation by a specific speaker in advance, and compare and detect the difference between the user's voice and the pre-registered voice. It was configured to recognize and perform the subsequent operations. Therefore, in such a telephone device as a home terminal device, it is cumbersome and impractical if a registration operation by a specific speaker is required. The present invention pays attention to this point, and enables hands-free answering call by performing identification by voice recognition which can be used by unspecified speakers and does not require registration. That is, a word uttered under a certain condition is realized simply and inexpensively by using a voice length-based voice recognition technology that can be recognized by voice length. FIG. 2 illustrates the present invention based on the description of FIG.
This will be described in more detail with reference to FIGS. FIG. 2 shows an embodiment of a main part of the present invention, and the same reference numerals as those in FIG. R1 to R7 are resistors, C1 to C4 are capacitors, CO
1 to CO3 are comparators.

When there is a call from an outside line, as shown in FIG. 3, a sound (1 second), a pause (2 seconds), a sound (1 second), a pause (2 seconds), etc. The ringing tone sounds repeatedly, and the incoming call information is transmitted to the control circuit 26.
(S1). If it is not in the off-hook state (S2-No), the pause time of the sound (2)
At second), the user replies to a hands-free telephone device located on a desk approximately 50 cm away from the user with a predefined word, for example, the word "Hi", which is to be used with one embodiment of the present invention. . This sound is output from the microphone 19
Is input to the microphone amplifier 20 via the amplifier and amplified and output. The amplified audio output signal is input to the band-pass filter 22 via the route b, where the noise component is removed from the environmental noise or the like coming from the microphone 19 in a room or the like, and only the audio signal component in a predetermined band is extracted. The output of the bandpass filter 22 is input to the detection circuit 23, where the original audio signal is demodulated. The demodulated audio signal is input to the low-pass filter 24 and outputs only a signal within the audio frequency band. This output signal is input to a comparator 25 in which a detection level of a predetermined threshold (Vth) is set, passes a signal exceeding the threshold, and outputs it to an input port of a control circuit (CPU) 26. . The control circuit 26 fetches a valid audio signal exceeding the threshold value sent from the comparator 25 (S9), and then determines whether the audio signal meets the following conditions (S10). As a result, if the audio signal satisfies the respective conditions, hands-free response command information is output (S11).

In one embodiment of the present invention, "Hi" is used as a predetermined word, but it is not limited to this, and "Oh" or "Oh" may be used. The squid can be adopted according to the discrimination between noise and the recognition technology of words. Further, the distance between the user's face (mouth) and the hands-free telephone device when uttering “Hi” is set to about 50 cm in the embodiment of the present invention, but is not limited to this. Can be changed according to the discrimination and the detection technique. In the present invention, the hands-free response is made by uttering "Hi", but the utterance level of "Hi" is 90 dBSPL or more even when uttered normally (detection of a distance of 50 cm). Is naturally greater than 100 dBSPL. The noise level is about 40 to 60 dBSPL in a normal indoor environment, and is about 70 dBSPL even at the peak of the TV volume. Therefore, the detection level (threshold) of voice and noise is set to 80 dBSPL.
If it is set to a degree, there is no malfunction due to noise, and the voice "Hi" can be recognized reliably.

FIGS. 3 to 5 are signal waveform diagrams showing respective conditions. FIG. 3 is a diagram showing a detection state of an audio signal waveform input from the microphone 19 in relation to a ring tone, FIG. 4 is a diagram showing an audio signal waveform determined to be capable of automatic response, and FIG. FIG. 4 is a diagram illustrating a sound signal waveform. In FIG. 3, as for the ring tone coming from the outside line, as shown in the signal waveform diagram (a-1), a 16 Hz alternating current signal arrives at an intermittent cycle of 1 second on (ringing) and 2 seconds off (pause). The control circuit 26 is configured to detect the noise and the sound “Hi” during the two-second pause. As shown in the signal waveform diagram (a-2), first, noise detection (A) input beyond the threshold value of the detection level determined by the comparator 24 is performed, and similarly, the noise level exceeds the threshold value. The input voice detection (B) is performed, and then the noise detection (C) input exceeding the threshold is performed. The noise detection (A) time (first detection time) detects the presence or absence of noise for about 600 msec after the sound of one second is cut off, for example. As for the time of voice detection (B), for example, the presence or absence of voice is detected for about 500 to 1000 msec after the noise detection time elapses. Time of noise detection (C) (second
The detection time is, for example, about 400 to 9 from the time when a valid voice is input and the voice ends, to the time when the next sound starts.
It is configured to monitor the presence or absence of noise for 00 msec. In this embodiment, these times are set as described above. However, the present invention is not limited to this, and it is needless to say that different times can be set based on design as appropriate.

FIG. 4 shows a signal waveform when it is determined that an automatic response is possible. In the signal waveform diagram (b) of FIG. 4, as shown, no signal detected as noise arrives within 600 msec of the noise detection (A) and 900 msec at the maximum in (C), and voice detection is performed. (B) 50
If only the appropriate audio signal “HI” is input during the time period from 0 to 1000 msec, the control circuit 26 determines that a hands-free automatic response is possible, and outputs hands-free response command information through the route a. With this hands-free response command information, the line closing circuit 3 operates to form a communication loop or DC loop between the line and the communication circuit 4, and the hands-free control circuit 21 operates to communicate with the microphone amplifier 20. The circuit 4 is coupled so that the audio output from the microphone 19 is transmitted to the line.

On the other hand, FIG. 5 shows a signal waveform when it is determined that an automatic response cannot be made. In FIG. 5, the signal waveform diagram (C-
As shown in 1), the user (responder) utters fast, and the beginning of “Hi” that exceeds the detection level (threshold) within the time of noise detection (A) enters, so it is detected as noise and automatically detected. It is determined that the call cannot be answered. Also, as shown in the signal waveform diagram (C-2), the utterance of the user is slow, and the beginning of "Hi", which exceeds the detection level (threshold) within the time of the noise detection (C), is inserted. It is detected and it is determined that the automatic response is impossible. Further, as shown in the signal waveform diagram (C-3), the utterance of the user is even slower, no voice signal is detected at the time of voice detection (B), and the detection level (threshold) within the time of noise detection (C). Value), which is detected as noise and is determined to be unable to respond automatically.

As shown in the signal waveform diagram (C-4), the utterance of the user is long and exceeds the detection level (threshold) beyond the time of voice detection (B) and further until the time of noise detection (C). Since the voice signal of “Hi” is input, it is determined that the voiced sound is too long, and the ending is detected as noise. On the other hand, the signal waveform diagram (C-
As shown in 5), the utterance of the user is short, and voice detection (B)
Since a "Hi" audio signal exceeding the detection level (threshold) within a short period (less than 400 msec) within the time period is input, it is determined that the sound is too short, and thus it is determined that automatic response is impossible. Further, as shown in the signal waveform diagram (C-6), if noise exceeding the detection level (threshold) enters the time of the noise detection (A) before the user utters, it is detected as having noise and automatically detected. It is determined that the call cannot be answered. Also, as shown in the signal waveform diagram (C-7), the user utters a voice, and after a "high" voice exceeding the detection level (threshold) is input within the time of the voice detection (B), a further voice is input. If noise exceeding the detection level (threshold) enters during the time of noise detection (C), it is detected as having noise and it is determined that automatic response is not possible. Therefore, in these cases, the control circuit 26 determines that the hands-free automatic response is not possible and does not output the hands-free response command information from the route a to the hands-free control circuit 21.

The operation of the hands-free control circuit 21 will now be described with reference to FIGS. 1, 2 and 7. In the normal state, if there is a sound output from the microphone 19 (S21), the hands-free control circuit 21 is in a sound transmission mode so as to always pass the sound signal to the communication circuit 4 (S22). Next, as described above, when there is an incoming call from the line, and no noise is detected in the input from the microphone 19 in the control circuit 26, it is determined that the sound of "Hi" is appropriate, and the hands-free response command information is output through the route a. In response to the response command information (S23), the hands-free control circuit 21 operates to directly couple the output terminal of the microphone amplifier 20 to the communication circuit 4, and outputs the voice for hands-free communication from the microphone 19, A voice transmission loop for transmitting to the line via the communication circuit 4 is formed by the c route (S24),
Further, since the input end of the speaker amplifier 17 is coupled to the c route by the d route, the communication circuit 4 and the speaker amplifier 1 are connected.
7 and the output terminal of the microphone amplifier 20 are connected to form a hands-free communication loop (S2).
5) Enter the hands-free answering call mode. When the hands-free communication with the line is completed, the hands-free response release information from the control circuit 26 is output through the route a. The presence of the response release information is detected (S26), and the output terminal of the microphone amplifier 20 is connected to the output terminal. The connection with the communication circuit 4 is released, the voice transmission loop by the c route and the speaker connection loop by the d route are disconnected (S27), and the process shifts to the standby state (Y).

In this manner, the hands-free control circuit 21
When the hands-free response command information is output from the control circuit 26 through the route a as shown in FIGS. 1 and 6 (S11), the circuit closing circuit 3 is operated by this response command information, and A DC loop is formed between the communication circuit 4 and the communication circuit 4 (S12), and the response command information is used to directly connect the output end of the microphone amplifier 20 to the communication circuit 4, so that a hands-free communication loop by the c route is established. It is formed (S13). At the same time, the communication circuit 4, the output terminal of the microphone amplifier 20, and the input terminal of the speaker amplifier 17 are connected and connected by the d route (S1).
4) Enter the hands-free answering call mode (S15).
As a result, the voice from the other party via the line is [connection terminal 1 → diode bridge 2 → line closing circuit 3 → communication circuit 4 → c route → hands-free control circuit 21 → d route → speaker amplifier 17 → speaker 18 ] Is transmitted from the speaker 18 in the route of []. The voice output for conversation from the microphone 19 is the route of [microphone 19 → microphone amplifier 20 → hands-free control circuit 21 → c route → communication circuit 4 → line connection circuit 3 → diode bridge 2 → connection terminal 1]. Is sent to the other party via the line. In this way, the user (the respondent) can make a hands-free answering call with the other party without performing the push button operation.

Also, during a hands-free answering call, the end-of-call detection circuit 8 monitors the state of the line, and detects the end of the other party via the line (on-hook information of the other party, detection of a busy tone, etc.) (S16). ), And sends the information to the control circuit 26 (S17). On the other hand, when the hands-free answering call ends, the keyboard 9 corresponding to the end key is pressed by the user, and the pressed information is sent to the control circuit 26 via the keyboard interface 10 (S17). The control circuit 26 sends out the hands-free response release information to the line closing circuit 3 and the hands-free control circuit 21 by the route a based on any of these information. In the line closing circuit 3, the DC loop between the line and the communication circuit 4 is broken to open the line (S18). The hands-free control circuit 21 detects the presence of the response release information, releases the connection between the output terminal of the microphone amplifier 20 and the communication circuit 4, and cuts off the voice transmission loop by the c route. Is released (S1
9). And it is formed so that it may transfer to standby state (X).

Next, a second embodiment of the present invention will be described. FIG. 8 is a circuit block diagram of a cordless telephone type hands-free telephone device according to a second embodiment of the present invention. M-TEL is a main telephone, and C-TEL is a portable cordless telephone, which is a device capable of making a call with an outside line and a mutual call between the main telephone and the cordless telephone by radio waves via an antenna. 1 and 2 denote the same components. 26a is a main control circuit (M-CPU),
33 and 38 are analog signal processing circuits, 34 and 37 are wireless circuits, 35 and 36 are antennas, and 39 is a terminal control circuit (T
-CPU), 40 is a charger connection terminal (ACa) connected to a commercial power supply via a charger, 9a, 10a, 17a to 20a, 22a to 25a, 30a are FIGS. 1 and 2
9, 10, 17 to 20, 22 to 25, and 30 respectively.

The difference from the first embodiment is that a hands-free answering call can be made from the cordless telephone C-TEL. Therefore, the main telephone M-TEL has an analog signal processing circuit 33, a radio circuit 34, an antenna 3
5 and a signal output from the hands-free control circuit 21 and the like and a signal input to the hands-free control circuit 21 and the like are taken into the wireless transmission / reception unit and controlled by the main control circuit 26a. ,
It communicates with the cordless telephone C-TEL using radio waves. In addition, cordless telephone CT
The EL is provided with a wireless transmission / reception unit including an antenna 36, a wireless circuit 37, and an analog signal processing circuit 38, and these are controlled by a terminal control circuit 39. The audio signal “Hi” from the microphone 19a is [20a → 22a → 23a →
24a → 25a] to the terminal control circuit 39 to detect whether or not the signal is appropriate. If the signal is appropriate, the signal is transmitted to the main telephone M-TEL via the wireless transmission / reception unit. The incoming signal transmitted from the line via the main telephone M-TEL is transmitted from the wireless transmission / reception unit [17a → 1].
8a] is output from the speaker 18a.

The hands-free response operation in the second embodiment is basically the same as in the first embodiment. However, the only difference is that the transmission and reception of signals are performed by radio waves and the detection of “Hi” is detected by the terminal control circuit 39. The transmission radio wave from the main telephone M-TEL to the cordless telephone C-TEL is 380 MHz in this embodiment.
Using a band, cordless telephone C-TEL to main telephone M
-A transmission radio wave to TEL is formed using a 250 MHz band. That is, when a calling signal arrives from the lines L1 and L2, a ringing tone of 1 second sound and 2 seconds of pause sounds repeatedly. This ring tone is output from the analog signal processing circuit 3
3 and transmitted via a radio circuit 34 to a radio wave (38
0 MHz) and transmitted from the antenna 35.
This is received by the radio circuit 37 of the cordless telephone C-TEL, converted into a ring tone by the analog signal processing circuit 38, and emitted from the speaker 18a via the speaker amplifier 17a. When the user who heard this does not go off-hook,
As described in the first embodiment with reference to FIG. 3, the cordless telephone C on a desk approximately 50 cm away from the user.
-When a reply "Hi" is given to the microphone 19a of the TEL, this sound signal is transmitted to the microphone amplifier 20a.
a → band-pass filter 22a → detector 23a → low-pass filter 24a → comparator 25a] to the terminal control circuit 39, and the analog signal processing circuit as an audio signal exceeding a threshold value which is a predetermined detection level. 38, a radio wave (250
MHz) and transmitted from the antenna 36.

In the main telephone M-TEL, this radio wave is received, converted by the analog signal processing circuit 33, fetched by the main control circuit 26a, and an audio signal matching each condition is input as shown in FIG. 4 or FIG. As a result, hands-free response command information is output through route a. With this hands-free response command information, the line closing circuit 3 operates to form a communication loop between the line and the communication circuit 4, and the hands-free control circuit 21 operates to convert the voice from the communication circuit 4 to analog. Signal processing circuit 38 and wireless circuit 3
4. Transmit the radio wave via the antenna 35. This radio wave is received by the antenna 36 and the radio circuit 37 of the cordless telephone C-TEL, and is converted into an audio signal via the analog signal processing circuit 38.
8a. Therefore, the voice for the conversation from the other party arriving via the lines L1 and L2 is transmitted by radio waves and transmitted as voice from the speaker 18a.
Voice for conversation from the microphone 19a is also transmitted by radio waves and transmitted to the other party as voice via the lines L1 and L2, so that the cordless telephone C-TEL is used.
Users can answer and talk hands-free.

Also, during a hands-free answering call, the end-of-call detection circuit 8 monitors the line status, detects the end of the other party via the line (on-hook information of the other party, detection of a busy tone, etc.), and obtains the information. To the main control circuit 26a. On the other hand, when the hands-free answering call ends,
Since the user of the cordless telephone C-TEL presses the keyboard 9a corresponding to the end key, the press information is sent to the terminal control circuit 39 via the keyboard interface 10a. The terminal control circuit 39 sends the press information to the main control circuit 26a of the main telephone M-TEL by radio waves. The main control circuit 26a sends out the hands-free response release information to the line closing circuit 3 and the hands-free control circuit 21 by a route based on any of these information. In the line connection circuit 3, the DC loop between the line and the communication circuit 4 is broken to open the line. The hands-free control circuit 21 detects the presence of the response release information, and
And speaker amplifier 17a of cordless telephone C-TEL
Is released and the voice transmission loop by the c route is disconnected, so that the hands-free answering call loop is opened. And it is formed so that it may shift to a standby state.
Note that these operation flows are the same as those in FIGS. 6 and 7 except that the hands-free response command is issued by a radio wave, and a detailed description thereof will be omitted.

[0027]

As is apparent from the above description, the present invention has the following effects. By using a simple voice recognition technology, without pressing the push button,
You can also select an automatic hands-free response action,
On the contrary, there is an advantage that a hands-free telephone device that can be selected not to perform a response operation can be realized at low cost. In addition, since there is no need to perform a registration operation by a specific speaker in advance, there is a practical advantage that it can be used anywhere.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram of a hands-free telephone device showing a first embodiment of the present invention.

FIG. 2 is a partial circuit configuration diagram of FIG. 1;

FIG. 3 is a voice detection output waveform diagram according to the present invention, showing a detection state of a voice signal waveform input from a microphone 19 in relation to a ringtone.

FIG. 4 is a voice detection output waveform diagram according to the present invention, showing a voice signal waveform for determining that automatic response is possible.

FIG. 5 is a voice detection output waveform diagram according to the present invention, showing a voice signal waveform for determining that automatic response is not possible.

FIG. 6 is a flowchart for explaining the operation of the control circuit of the device of the present invention.

FIG. 7 is a flowchart for explaining the operation of the hands-free control circuit of the device of the present invention.

FIG. 8 is a circuit block diagram of a cordless telephone type hands-free telephone device according to a second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Connection terminal of telephone line (L1 / L2) 2 Diode bridge for polarity matching 3 Transistor circuit for DC closing (line closing circuit) 4 Talking circuit 5 Receiver 6 Transmitter 7 Dial circuit 8 End-of-call detecting circuit 9 Keyboard 10 Keyed interface (KBF) 11 Hook switch 12 DC cut capacitor 13 Rectifier diode bridge 14 Tone ringer circuit 15 DC separation transformer 16 Incoming signal detection circuit 17 Speaker amplifier 18 Speaker 19 Microphone 20 Microphone amplifier 21 Hands-free control Circuit 22, 22a Band pass filter 23, 23a Detector 24, 24a Low pass filter 25, 25a Comparator 26 Control circuit (CPU) 26a Main control circuit (M-CPU) 27 LED display 28 Liquid crystal display 29 External power input terminal (AC) 30, 30a Power circuit for operating each circuit 31 t is its contact in a power monitoring circuit (T relay) 32 Reset circuit 33, 38 which outputs a reset signal to control circuit when power is turned on / off Analog signal processing Circuits 34, 37 Wireless circuits 35, 36 Antenna 39 Terminal control circuit (T-CPU) 40 Charger connection terminal (ACa) connected to commercial power supply via charger R1 to R7 Resistance C1 to C4 Capacitor CO1 to CO3 Comparator

Continuation of front page (72) Inventor Shinji Sakagami 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Examiner, Nippon Telegraph and Telephone Corporation Masafumi Yamada (56) References JP-A-2-202255 (JP, A) JP JP-A-63-299434 (JP, A) JP-A-1-162049 (JP, A) JP-A-63-266950 (JP, A) JP-A-2-179059 (JP, A) JP-A-61-270959 (JP) , A)

Claims (2)

(57) [Claims] 1. A telephone device including a communication circuit and connected to a line, comprising: a transmitting unit and a receiving unit for performing a hands-free answering call with a partner via the line; Any of the ring tones that ring according to the incoming signal
At the beginning and end of the pause
Within the first and second detection times predetermined to be
Noise that exceeds the predetermined input level is not included.
Detected in the middle of the first and second detection times.
Within a predetermined voice detection time
The audio signal detected exceeding the input level
Pre-defined sound input through speech means
Hands-free response when voice signal is detected
Control means for outputting command information ; line closing means for forming a communication loop between the line and the communication circuit based on hands-free response command information from the control means; and hands-free response command from the control means. A hands-free control unit for forming a hands-free answering call loop by combining the call circuit with the transmitting means and the receiving means based on the information. 2. A main telephone comprising a radio transmitting / receiving means and a communication circuit and connected to a line, and a radio telephone comprising a transmitting means, a receiving means and a radio transmitting / receiving means for transmitting radio waves to and from the main telephone. A cordless telephone, comprising: a cordless telephone that transmits and receives as a medium and communicates with the other party via the line, wherein the cordless telephone has one of ring tones ringing in response to an incoming signal from the line.
At the beginning and end of the pause
Within the first and second detection times predetermined to be
Noise that exceeds the predetermined input level is not included.
Detected in the middle of the first and second detection times.
Within a predetermined voice detection time
The audio signal detected exceeding the input level
Pre-defined sound input through speech means
It is sent to the detection output to come and it is detected a voice signal
Main control means for outputting hands-free response command information based on a detection output input from the terminal control means via a radio wave, and a hand control from the main control means. Line closing means for forming a communication loop between the line and the communication circuit based on the free response command information; and transmission means for the communication circuit and the cordless telephone based on the hands-free response command information from the main control means. And a hands-free control unit that forms a hands-free answering call loop by coupling with a receiving unit via a radio wave.