JPH02179059A - Telephone set - Google Patents

Abstract

PURPOSE:To attain an incoming reply with simple equipment and high reliability without any manual operation by forming a DC loop to a telephone line on the condition that a voice sound is discriminated to be included in an input signal. CONSTITUTION:A control circuit 14 allow a voice detection section 22 to receive an input signal from a microphone 12 and the section 22 calculates the reference axis cross number of the input signal and the value of the waveform with respect to the amplitude distribution as a characteristic parameter. The result of calculation is compared with a dictionary data as to the voiced sound and specific noise so as to discriminate whether or not the input signal included the voiced sound. Thus, the control circuit 14 applies drive control to a telephone set circuit 11 so as to form a DC loop to the telephone line on the condition that the detection circuit 22 discriminates it that the input signal included the voiced sound under the state that an incoming call detection circuit 19 detects the arrival of a call from the telephone line.

Description

[Detailed description of the invention] [Industrial application fields] TECHNICAL FIELD The present invention relates to a telephone that allows telephone calls without using hands.

[Conventional technology]

Conventionally, a telephone that allows you to make calls without using your hands was developed in Japanese Patent Application Laid-open No. 1983-
This method has been proposed in Japanese Utility Model Publication No. 30850 and Japanese Utility Model Application Publication No. 152341/1983.

The telephone described in Japanese Patent Application Laid-Open No. 61-30850 has a built-in voice recognition circuit, recognizes the user's voice collected by a microphone, and responds to an incoming call or terminates a call depending on the recognition result. It is something to do.

The telephone described in Japanese Utility Model Publication No. I:1-152341 has a built-in voice sensitive circuit, and senses the voice emitted around the telephone when receiving a call, and performs an incoming call response operation.

[Problem to be Solved by the Invention] However, in the telephone described in Japanese Patent Application Laid-Open No. 61-30850, the voice J2. It is necessary to accurately recognize the voice because there are some cases where the voice is answered or terminated based on the voice recognition. This requires a large-scale dictionary for recognition, and also complicates the device configuration for improving response speed. Furthermore, dictionary contents inevitably deteriorate and require updating, which is inconvenient.

Furthermore, since the specific configuration of the voice-sensitive circuit in the telephone described in Japanese Utility Model Application Publication No. 63-152341 is unknown, it is difficult to ensure reliability in answering incoming calls without malfunctioning even in a noisy environment. Furthermore, this fruit u (1986-1
The telephone described in Japanese Patent No. 52341 is inconvenient to use because it requires the user to manually set the hook switch to the on-hook state at the end of a call.

SUMMARY OF THE INVENTION An object of the present invention is to provide a telephone that can answer and/or end a call with high reliability and without using a telephone, with a simple two-tub configuration.

[Means for Solving the Problems] The present invention as set forth in claim 1 provides a telephone circuit connected to a telephone line, an input device capable of inputting voice information to the telephone circuit, and an input device capable of inputting information sent from the telephone line. In a telephone comprising an output device capable of outputting sound and a control circuit capable of driving a telephone circuit, the control circuit receives an input signal from the input device and calculates the number of reference axis crossings and waveform of the input signal. It is equipped with a voice detection circuit that calculates values related to amplitude distribution as characteristic parameters, compares the calculation results with dictionary data on voiced sounds and specific noise, and determines whether the input signal contains voiced sounds. The system includes means for forming a DC loop in the telephone line on the condition that the voice detection circuit determines that the input signal contains voiced sound when an incoming call is detected. .

The present invention as set forth in claim 2 provides a telephone circuit connected to a telephone line, an input device capable of inputting audio information into the telephone circuit, an output device capable of outputting information sent from the telephone line audibly, and a telephone circuit. of! ! In a telephone equipped with a control circuit that can be controlled by telephone, the control circuit includes a call-end signal I3-detection circuit that detects the end-of-call signal of the other party from among the notifications sent from the telephone line. and a means for opening a DC loop formed in the telephone line on the condition that a call-end signal is detected by a call-end signal detection circuit.

The present invention as set forth in claim 3 provides a telephone circuit connected to a telephone line, an input device capable of inputting voice information to the telephone circuit, and an output device capable of outputting information sent from the telephone line if sound is output. In a telephone equipped with a control circuit capable of driving and controlling a telephone circuit, the control circuit receives an input signal from an input device, and converts the number of reference axis crossings of the input signal and the value regarding the amplitude distribution of the waveform into characteristic parameters. This calculation result is used as a prediction for voiced sounds and specific noises.
- A voice detection circuit that compares the input signal with voice data and determines whether the input signal contains a voiced sound is installed, and when an incoming call from a telephone line is detected, the voice detection circuit includes a voiced sound in the input signal. i) Detection of a call-end call, which includes means for forming a DC loop in the telephone line and detects the call-end signal of the other party from among the information sent from the telephone line, on the condition that jl+ is determined. The telephone line is equipped with a circuit, and includes means for opening a DC loop formed in the telephone line on condition that a call-end signal is detected by the call-end signal detection path.

[Function (1) According to the present invention set forth in claim 1, the control circuit:
A DC loop is formed in the telephone line on the condition that the voice detection circuit determines that the input signal includes voiced sound. Therefore, when the incoming call information from the other party is sent from the telephone line and is outputted soundly from the output device n, when the user emits voice toward the input device, this voice signal is transmitted from the input device to the control circuit. A DC loop is formed in the telephone line according to the result of the determination that the voiced sound is transferred, and as a result, the incoming call response operation can be completed without using hands. Under this DC loop formation state, the content of the user's call is input to the input device a, the content of the call from the other party is outputted from the output device, and the conversation between the two parties is carried out.

At this time, in the present invention, since two variations of the number of reference axis crossings and the value related to the amplitude distribution of the waveform are used as feature parameters for voice detection, the category "voiced sound" and the category "specific noise" are defined in the parameter space. can be clearly separated. Therefore, even if the amplitude of the specific noise is large and its influence on speech detection is large, the noise environment jζ
The presence of 11 voices of °C can be detected with a high detection rate, and malfunctions in response to incoming calls can be prevented. In addition, the above 2
The two parameters are relatively easy to calculate, and the configuration is also simple. Furthermore, since the above two parameters are handled as dictionary data, there is very little deterioration and there is almost no need for updating.

(2) Next, according to the present invention as set forth in claim 2.

The first circuit opens the DC loop formed in the telephone line on the condition that the end of call signal of the other party is detected by the end of call signal detection circuit. When the call is hung up and the call-end signal that is generated along with this is sent, the control circuit uses the call-end signal detection circuit to confirm the transfer of the call-end signal and opens the DC loop of the telephone line.

As a result, the call termination operation can be completed without using hands.

At this time, in the present invention as set forth in claim 2, a call end signal sent through a telephone line is used as the call end information, and an audio signal emitted by each user himself is not used. Therefore, the call end timing can be easily detected with a high detection rate, and the call end operation does not involve any malfunction. Also, since the two-legged end-of-call signal is uniform,
The device configuration of the detection circuit is also simple.

(3) According to the present invention as set forth in claim 3, both of the effects of (1) and (2) above can be obtained.

[Embodiment] FIG. 1 is a circuit diagram showing a telephone according to an embodiment of the present invention,
FIG. 2 is a circuit diagram showing a voice detection circuit, and FIG. 3 is a schematic diagram showing a parameter space formed by feature parameters for voice detection.

The telephone 10 includes a telephone circuit 11, a microphone 12 (input device "W"), a speaker 13 (output device), and a control circuit 14.
, a microphone switching circuit 15 , a microphone amplifier 16 , and a speaker amplifier 17 .

The telephone circuit 11 is connected to a telephone line via a telephone line connection terminal 18, and includes an incoming call detection circuit 19 that detects an incoming call from the telephone line, a dial circuit 20 that sends a dial signal to the telephone line, and a telephone line. It is configured to include a telephone communication circuit 21 that connects a microphone 12 and a speaker 13.

The microphone 12 is connected to the telephone circuit 11 and the control circuit 14 by a microphone switching circuit 15 driven by the control circuit 14.
selectively connected to either. At this time, the microphone 12 is connected to the control circuit 14 when on standby for a call, and connected to the telephone circuit 11 during a call.

The speakers 1 and 3 are connected to the telephone circuit 11 and can output audible information sent from the telephone line.

The control +ff11 circuit 14 includes an r1 voice detection circuit 22 and a call end signal detection circuit 23, and the following (A) (1,
1), the telephone circuit 11 can be driven and controlled.

(The layer control circuit 14 receives the input signal from the microphone 12 into the n re-detection circuit 22, and uses the voice detection circuit 22 to determine the number of reference axis crossings of the enormous force signal and the value regarding the amplitude distribution of the waveform as characteristic parameters. This calculation result is compared with dictionary data regarding voiced sounds and specific noise to determine whether the input signal includes voiced sounds.

As a result, when the incoming call detection circuit 19 detects an incoming call from the telephone line, the control circuit 4 determines that the voice detection circuit 22 determines that the input signal C5 includes a voiced sound. The telephone circuit 11 is connected to the drive side (I) so as to form a DC loop in the four telephone wires.

In addition, the control circuit 14 is controlled by the incoming call detection circuit 19.
5. In a state F in which an incoming call from the telephone line is not detected, a DC loop is formed in the telephone line on the condition that the voice detection circuit 22 determines that the input signal includes a voice sound. The telephone circuit 11 is driven and controlled so that the telephone number signal is sent from the telephone number circuit 20 to the same telephone line in advance in correspondence with the other party at a specified location and registered in °C.

Note that details of the voice detection operation of the voice detection circuit 22 will be described later.

fB) The control circuit 14 uses the end-of-call signal detection circuit 23 to
A call end signal (busy 1--on signal) of the other party is detected from the information sent from the telephone line. This results in
The control circuit 14 drives and controls the tU telephone circuit 11 to open the DC roof formed on the telephone line on condition that the call end signal is detected by the call end signal detection circuit 23.

By the way, the voice detection circuit 22 included in the control circuit 14
Specifically, it is constructed as shown in FIG. That is, in FIG. 2, 31 is a low-pass filter, 32 is A
/D converter, 33 is a vergemeter calculation section, 34 is a dictionary data storage section, 35 is a determination section, and 36 is a result output section. In this embodiment, audio in a noisy environment is detected as follows.

(1) For voiced sounds and specific noises, prepare dictionary data whose characteristic parameters are the number of reference axis crossings x1 within a certain time of these signals and the value x2 regarding the amplitude distribution of the waveform, and store this dictionary data. The information is stored in the section 34.

Here, as the value x 2 regarding the amplitude distribution of the waveform, any one of the following (2), (2), and (2) can be used.

■ Wave height value P0 expressed by the formula below P: 20X log+o (Vp/Lmj However, V
Maximum absolute value of amplitude within Pany time interval V4. ; Effective value of &width within the same fixed time interval ■ Wave height value I) expressed by the formula 1ζ.

P = 20x log+o(Vp/Va) However, V
P The maximum value of the absolute value of the amplitude within the time interval v & 2 The average value of the absolute value of the amplitude within the fixed time interval ■ Amplitude - - Threshold value that makes the effective value 11 low within the fixed time interval time to exceed (super standard amplitude time).

-1- When using the wave height value described in (■), parameter values that relatively faithfully reflect the sharp waveform that is characteristic of voiced sounds are used, and it is said that the discriminability of 'Bt R will improve. There are benefits.

] - When using the wave height value in the record (■), it is possible to reduce the amount of calculation compared to the memory wave height value, and use a parameter value that faithfully reflects the sharp waveform that is a characteristic of voiced sounds. This has the advantage of improving the discrimination of noise.

When using the peak value of (2) above, there is an advantage that the amount of calculation can be reduced compared to the peak values of (2) and (3) above.

Further, the dictionary data 'C is, for example, the following (a).

(b) and (C) are created.

(a) A set of feature parameters for voiced sound [a] obtained from a large number of voices.

(b) A set of a large number of characteristic parameters determined for a specific noise (ringing sound of a specific telephone).

(c) Voiced sound [Ako and specific noise, 20 X log+o (Srmg/Nr+am) [
Voiced to specific noise ratio defined by dDl3. Q, -
3°-6, -10[dDl A set of feature parameters obtained for a large number of voices by adding them together. In addition, S r
l! ill represents the effective value of the amplitude of the voiced sound "a")
N I' P A M does not represent the effective value of the amplitude of the specific noise.

(2) Collect an input signal with the microphone 12, amplify this input signal with the amplifier 16, cut unnecessary high frequency components by passing it through the low-pass filter 31, and convert it into a digital signal with the converter 32, It is sent to the parameter calculation section 33. The parameter calculation unit 33 calculates the reference shaft support X' number within a certain period of time x 1 of the input signal and the value regarding the amplitude distribution of the waveform x 2 as characteristic parameters.

(3) The determination unit 35 compares the 11; characteristic parameters calculated in (2) above with the dictionary data or standard pattern defined in (1) above, and determines whether the input signal contains a voiced sound or not. T, 11 is determined, and the result of this determination is output from the result output section 36.

Here, pattern recognition using the aforementioned dictionary data is performed, for example, on the parameter space of FIG. 3 as follows.

In addition, in FIG. 3, two characteristic parameters, the number of zero crossings (the reference axis level is set to zero level) and the peak value, are plotted on the X1 axis and the X2 axis, respectively. In Fig. 3, μm, σI2 is the voiced sound (the voiced sound [a] of (a) above, or the specific noise of the above [c) added at a specific voiced sound to specific noise ratio. represents the average value of the dictionary parameters of (voice), the standard deviation of ×1 axis component, the standard deviation of ×22 axis component, μ2,
21 and σ2□ respectively represent similar values for the dictionary parameters of the specific σ noise.

■Category “voiced sounds” defined by dictionary data (mentioned above)
A boundary 1 is defined that divides the voiced sound [a] in a), or the voiced sound category in which the specific noise in (c) above is added at a specific ratio) into two, and the category "Other". In boundary 1, the side that includes the average value μm of the dictionary data of voiced sounds is the category "voiced sounds". This boundary 1 is a concentration ellipse that shows how much dictionary data of voiced sounds is concentrated around the average value, and by changing the length of the axis, you can change the proportion of dictionary data of voiced sounds that fall within the ellipse. I can do it. In this embodiment, the length of the axis is determined so that 90% of the voiced sound dictionary data falls within the ellipse. The dashed line is μ
represents the concept of the category ``voiced sounds'' defined by σ. That is, in the process (2), it is determined which category of the boundary 1 the feature parameter of the input signal belongs to.

0th order, the amplitude of the specific noise is large, which has a big impact on the detection of voiced sounds! Considering the possibility of
- In addition to note (■), define boundary 2 between the category ``Specific 'm sounds'' and the category ``Voiced sounds.'' In boundary 2, the side that includes the average value μ2 of the specific noise is in the category "specific noise." This boundary 2 is a collection of points that have the same likelihood for the category "voiced sound" and the category "specific noise." In the case of this example, the standard deviation of the specific noise is the dictionary data of the artificially created incoming ring tone of a telephone, which is the sum of voiced sounds and specific noises at a specific voiced to specific noise ratio. Since it is generally smaller than the standard deviation of , the category ``specific noise'' is a closed space. The dashed line is μ
Category 1 No ``Specific Area 11'' defined by σ represents the contemplation of ``Specific Area 11''. In other words, it is in the overhang of this ■ (゛ is Input 11.Bow characteristic parts meter
``It is difficult to determine which category belongs to the other side.

Qδ1−0), the unity of the judgment of ■, whether the input value is + sub, or the boundary at ■ on the feature parameter space.Me1. L on the side
↓; し、か−）■ When not belonging to the μ2 side of the smell ゛C boundary 2, the person nonoi +'j ”'re force-golly r 'O
'j' -6t If it belongs to J, determine 1'. 4 rope t5, enter, -;

Next, the communication operation (1) of the L charger 10 will be explained.

(1) Telephone call (if there is a transmission from 11th phone, telephone circuit 1
1 n signal detection circuit detects 10 or 11 signals. This detection +
;is+ii, the speaker 13 is driven through the amplifier 17, and the user is notified of the arrival.

In this call standby state, the microphone switching circuit 15 switches the microphone 1
2 is connected to a control circuit 14, and the control circuit 4 constantly analyzes input signals from the microphone 12. At this time,
When the user utters a ``(-, i] voice sound, including ?'' toward the microphone 2, the i7 voice detection circuit 22 of the control circuit 14 detects the presence of this voiced sound. As a result, As a result, the control circuit 14 drives and controls the telephone circuit 11 so as to form a DC loop in the telephone line.At the same time, the control circuit 14 drives the microphone cut-off I negative circuit 15 to turn off the microphone 1.
2 is connected to the telephone circuit 21 of the telephone circuit 11, and the terminal 4 is used so that a telephone call can be made without using the telephone.

(2) When the call ends and you knock on 111, the telephone circuit 11 receives a message indicating the end of the call (-ffj number (hishi-1/-n building number). This signal is sent from the speaker]:3 to the piece in use. At the same time, it is also transmitted to the control circuit 14.
1) Detection circuit 2: When detecting the call termination signal described in 3 or 1-, the control circuit 14 drives and controls the telephone circuit 11 to open the direct current loop of the telephone line, and stops the telephone line from being used. To complete a call termination operation without using hair.

(3) In addition, when the incoming call detection circuit 19 of the telephone circuit 11 does not detect an incoming call and a voice containing a voiced sound is emitted toward the C1 user name or the microphone 12 while the incoming call detection circuit 19 has not detected an incoming call, the control circuit 14 :tr! 1 detection circuit 22 detects the presence of this voice 11'. As a result of this, control +311 tj
The lines 1 and 4 form a DC loop in the telephone line, and one of them is a telephone number Uj for a particular place registered.
(, i !j or 1u) The serial circuit 20 of the telephone circuit 11 is driven so that the signal is sent to the telephone line of 1. be done.

Next, we will explain the effect of the dry crime example.

According to the embodiment 1-, due to the presence of the control circuit 14 and its agreement detection circuit 21, the used piece can be moved around the neck without using hands.
1 response operation can be performed.At this time, in the above embodiment, the i'?6t parameter of Ondo j detection can be set.
2 of the value regarding the amplitude distribution of the C13jjq axis cross-cross number form
Since two roses and meters were used, Category 1 voiced J'
and the category "specific noise" in the parameter space.
C. Can be clearly separated. (Even if the amplitude of the specific region 11 is large and the influence on voice detection is large, the presence of N''1 voices in a rough environment can be detected with a high detection rate, and it is possible to In addition, the parameters 1 and 2 are relatively easy to calculate and the device configuration is simple.Also, the two parameters are treated as 1-1 data. There is very little deterioration and there is almost no need for renewal.

Further, according to the embodiment F, the presence of the control circuit 14 and its call termination signal detection circuit 2:3 allows the user to complete the call termination operation without using his/her hands. At this time, in the above embodiment, the communication path i'f111 is reported, and the communication line is connected to the telephone line.
It uses the sent end story i1 宕, and is it uttered by the user himself? Therefore, the call end timing can be easily detected with a high detection rate, and there will be no malfunction (t-) in the call end operation. Since the number is uniform, the configuration of the detection circuit is also simple.

I wanted to (, F, +ft! According to the example, fl?
The easy-to-use device configuration allows for highly reliable, hands-free operation.
It is possible to obtain a call response and a call path T-(').

In addition, in carrying out the present invention, the telephone set is provided with the above-mentioned (1) to (
Among the three operations in 3), those that have only (1), (
It may be possible to implement only 2) or to include only 2) (1) and (2).

[Effects of the Invention] As described above, according to the present invention, with a simple device configuration,
It is possible to obtain a telephone that can answer and/or end calls without using hands with high reliability.

4. Brief explanation of the ci17I plane FIG. 1 is a circuit diagram showing a telephone according to an embodiment of the present invention;
FIG. 2 is a circuit diagram showing a voice detection circuit, and FIG. 3 is a schematic diagram showing a parameter space formed by feature parameters for voice detection.

10...telephone, 11...telephone circuit, 12...Microphone (input device).

13...Speaker (output device), 14... control circuit, 19... Incoming call detection circuit, 21...Telephone circuit, 22... voice detection circuit, 23...Call end signal detection circuit.

Patent applicant: Tatemizu Chemical Industry Co., Ltd. Representative: Hiroshi 1) Kaoru Figure 1 Figure 2 Figure 3

Claims (3)

[Claims] (1) A telephone circuit connected to a telephone line, an input device that can input audio information into the telephone circuit, an output device that can output information sent from the telephone line as a sound, and a control circuit that can drive and control the telephone circuit. The control circuit receives an input signal from the input device, and
The number of reference axis crossings of the input signal and the value related to the amplitude distribution of the waveform are calculated as feature parameters, and the calculation results are compared with dictionary data regarding voiced sounds and specific noise to determine whether the input signal includes voiced sounds. A DC loop is formed in the telephone line on the condition that the voice detection circuit determines that the input signal contains voiced sound when an incoming call from the telephone line is detected. A telephone characterized in that it includes means for. (2) A telephone circuit connected to the telephone line, an input device that can input audio information into the telephone circuit, an output device that can output the information sent from the telephone line as sound, and a control circuit that can drive and control the telephone circuit. The control circuit includes a call-end signal detection circuit that detects the call-end signal of the other party from among the information sent from the telephone line, and the control circuit includes a call-end signal detection circuit that detects the call-end signal of the other party from among the information sent from the telephone line. 1. A telephone set comprising means for opening a DC loop formed in a telephone line on the condition that detection is detected. (3) A telephone circuit connected to the telephone line, an input device capable of inputting voice information into the telephone circuit, an output device capable of outputting information sent from the telephone line audibly, and a control circuit capable of driving and controlling the telephone circuit. The control circuit receives an input signal from the input device, and
The number of reference axis crossings of the input signal and the value related to the amplitude distribution of the waveform are calculated as feature parameters, and the calculation results are compared with dictionary data regarding voiced sounds and specific noise to determine whether the input signal includes voiced sounds. A DC loop is formed in the telephone line on the condition that the voice detection circuit determines that the input signal contains voiced sound when an incoming call from the telephone line is detected. and a call-end signal detection circuit for detecting the call-end signal of the other party from among the information sent from the telephone line,
A telephone set comprising means for opening a DC loop formed in a telephone line on condition that a call end signal is detected by a call end signal detection circuit.