JPH04207348A - Signal tone detection method - Google Patents

Abstract

PURPOSE:To prevent malfunction of an automatic notice device by shifting a phase of an input signal tone, detecting a level difference between an original signal and a signal tone after phase shift, discriminating the level difference by a comparator so as to detect the presence of a voice signal or the like. CONSTITUTION:An inputted busy tone is delayed for the phase by 180 deg. at a phase shift circuit 1 and a signal (a) after phase shift and an original signal are inputted to a differential amplifier circuit 2 to detect a level difference (b) between both the signals. The signal (b) is subjected to effective value processing (c) by an effective value processing circuit 3 and compared with a threshold level set optionally by a processing section 4 of a next stage to binarize the signal (d). The signal (d) is used to control an output signal (e) from a signal tone detection section 5 thereby detecting a busy tone. Thus, mis-detection of the signal tone detection section 5 due to voice signal or the like is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a signal sound detection method for detecting a single frequency signal sound without being influenced by an audio signal, a plurality of mixed signals having different frequencies, or the like.

[Conventional technology]

In the conventional method, the signal sound is input to a band-pass filter, signal sounds outside the set frequency are removed, the waveform is rectified by the aftereffect rectifier, and the integral binarization circuit in the subsequent stage performs 0 or 1 judgment. Signal tones were detected by the intermittent ratio of the signal tones using mono multi-stage circuits.

[Problem to be solved by the invention]

Since the above-mentioned conventional technology detects only the presence or absence of a set frequency, the present invention aims to approximate the set frequency and prevent false detection due to audio signals, mixed signals of a plurality of frequencies, etc.

Furthermore, considering the automatic notification μ award using the above-mentioned conventional technology, the automatic notification device is usually set with a plurality of automatic notification destinations. If an event that should not be reported occurs, a call is made to the first priority number, but if the called party is busy, the notification is terminated and a call is made to the second priority number. At this time, a line busy signal is generated.

SUMMARY OF THE INVENTION An object of the present invention is to perform accurate i-on detection and prevent malfunction of an automatic alarm device.

[Means to solve the problem]

In order to achieve the above purpose, the input signal tone is phase-shifted).
・A phase shift is performed in the circuit, and the original signal is crushed and the signal tone after the phase shift is sent to a differential amplifier circuit. [The level difference between both signals is detected, and the effective value conversion circuit converts the level difference into an effective value. of(
The comparator determines the l and bell difference and detects the presence or absence of an audio signal, etc.

[Effect]

In this method, the phase of the human signal is delayed by 180 degrees from the phase left 1L-jj signature knee. Next, by detecting the difference between the human input signal and the phase-shifted signal using a differential amplifier circuit, it is possible to distinguish between an unstable amplitude signal (speech signal, etc.) and a constant amplitude signal (sound signal, etc.). I can do it. In addition, by converting the difference into an effective value to the effective value conversion circuit in the subsequent stage, the signal is converted into a binary value by the next stage). <1' Eliminate one work.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. , Figure 2 shows the change in frequency when a busy tone (400820, 5 seconds on, 0.5 seconds off) is input to this circuit.
．． The input busy tone is phase shifted) from 11 circuits.
．． 80 degree phase delay 0, (2nd a) Next (this phase shift i・later signal and JjTl, signal difference 1) amplifier circuit 2
1σ input and both signals σ month..., detect the difference 4 1,
(2nd L#b) This signal is reduced to an effective value by the effective value converting circuit 3 (Fig. 2c), and compared with a threshold value arbitrarily set by the -1 inverter section 4 in the next stage. Binarize the number. (Fig. 2d) By controlling the output signal from the signal tone detection section 5 with this signal, the busy tone can be detected. (FIG. 2f) Next, FIG. 3 shows changes in the signal when an audio signal is input to this circuit. The input audio signal is converted into a signal as shown in FIG. 3a by the phase shift circuit 1. The level difference between this signal and the original signal is determined by the differential amplifier circuit 2 as shown in FIG. The signal obtained by converting this signal into an effective value by the effective value converting circuit 3 is as shown in FIG. 3C.

Further, the signal binarized by the comparator section 4 at the subsequent stage becomes as shown in FIG. 3d. On the other hand, the audio signal erroneously detected by the signal sound detection section 5 is as shown in FIG. 3e. By controlling this signal with the output signal of the comparator section 4, it becomes as shown in FIG. 3(f) and is not detected in the audio signal.

According to this embodiment, there is an effect of preventing erroneous detection by the signal sound detection unit due to audio signals or the like.

The fourth part is an example of home automation incorporating a home information board with an automatic alarm function using this method.
6 is an in-house information board with an automatic alarm function, 71 is a dwelling unit adapter which is connected to the interface booth between the in-house system and external system, and the dwelling unit lid button 7 is equipped with a telephone line 8, and a building bus for transmitting Eirin information and building information. 9 and doorbell with camera 10
The connection line 11 is used for connection. 12 is a home bus for transmitting information in the house, and this home bus 12 is connected to a telephone terminal 14 and a monitor camera 16 via a telephone IFU 13.
Camera 1FtJ15. Control IF that interfaces with equipment 18 such as an air conditioner
17, a sensor IFU 19 is connected that interfaces with a sensor 20 that detects abnormalities in the house.

, FIG. 5 is a block diagram of the main parts of the home information board 6 with the automatic alarm function, in which 21 is a main control section including a processing device, program software, and a memory section for storing various data;
is a transparent touch panel device, 23 is a touch panel device 22
Key human horn control unit that performs input from the outside through 2
4 is a display device, 25 is an image control unit 26 that outputs image 1# to the display device 24, and 27 is an audio processing unit.
interfaces with the telephone line and connects microphone 2.
8, telephone system control that connects the speaker 29 and the home bus 12; 30, an HBS control section that performs in-flight communication with the home bus; 31, a communication control that controls the HBS control section and the telephone system control section, and interfaces with the main control section; I'm at the club.

FIG. 6 is an operational flowchart at the time of automatic warning.

When an abnormality occurs in the house, information detected by the sensor 20 is transmitted to the home bus 12 via the sensor 11FU19. The in-home information panel 6 with an automatic alarm function connected to the home bus] 2 connects the home bus to the dwelling unit adapter 7 in order to automatically alarm the call destination set in advance based on this information.
2 to issue an outside line supplement request. The dwelling unit adapter 7 forms a loop in the telephone line and supplements the outside line. The E5 dial tone transmitted from the captured telephone line 8 is detected by the telephone system control section 27 in the home information board 6 with an automatic alarm function via the home bus 2, and if there is no dial tone, the call is made or received. It is determined that there is a collision, and the call ends, and if there is a dial tone, the operation moves to sending a dial to the other party. To dial the destination, the main control unit 21 and the communication control 31
．． The communication is carried out from the HBS control unit 30 via the home bus 12 to the dwelling unit adapter 7 via the telephone line 8. After dial transmission is completed, the dwelling unit adapter 7 performs lever detection to determine whether the other party has answered, and the information is transmitted via the home bus 12 to the home information board 6 with an automatic alarm function. Based on the information indicating that reverse detection has been detected, the operation moves to busy tone detection next. At this time, if a busy tone is detected by the telephone system section 27 connected to the telephone line 8 via the home bus 12, the other party is talking and the call is terminated, and if no busy tone is detected, a security message is sent to the voice processing section. 26 and is transmitted to the telephone line 8 via the telephone system control section 27 and the home bus 12. At this time, the call destination is terminated by detecting a busy tone, and if a busy tone is detected, the call destination is terminated and the next set connection operation is performed. Finally, all automatic alarms are terminated by detecting the tone during automatic alarms.

〔Effect of the invention〕

According to the present invention, it is possible to accurately detect a constant amplitude signal sound without being affected by unstable amplitude signals such as audio signals. Furthermore, since voice signals and the like can be detected, there is also the effect that a busy state on a telephone line can be detected without detecting the direct current potential of the line.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of an embodiment of the present invention, Fig. 2 is a signal change diagram when a busy tone is input, Fig. 3 is a signal change diagram when a voice signal is input, and Fig. 4 Fig. 6 shows the root cause of an example of Baum automation incorporating an in-home information board with an automatic alarm function using the present invention, Fig. 5 is a block diagram of the in-home information board with an automatic alarm function, and Fig. 6 shows when an automatic alarm is issued. This is the operation flowchart-1. Explanation of symbols 1 Phase shift circuit, 2 Differential amplifier circuit 3 Effective value conversion circuit 4 Comparator section 5, signal sound detection section 6, in-home information board with automatic alarm function 7, dwelling unit adapter 8...telephone line 9 Residential building bus
10... Door phone with camera 11 Connection line
12 Home bus 13 Telephone IFU 14 Telephone terminal 15 Camera IFU 16 Monitor camera 17 Control IFU 18 Equipment 19 Sensor IFtJ 20 Sensor 21 - main control unit 22 Transparent touch panel device 23 Manpower Control section 24...Display device 25 Image control section 26.Audio processing section 27 Telephone system control section 28..Microphone 29 Speaker 30..HBS control section 31 Communication control section agent Patent attorney Katsuo Ogawa 1st], No.? Figure 3 Same

Claims (4)

[Claims] (1) A signal sound detection section that detects a single-frequency signal sound includes a phase shift circuit that adjusts the phase of the input signal sound, and a difference that amplifies and outputs the level difference between the input signal sound and the signal sound output from the phase shift circuit. A signal sound detection method comprising a dynamic amplification circuit, an effective value converting circuit that full-wave rectifies and integrates this signal, and a comparator section that determines whether this output signal is valid or invalid. (2) An automatic alarm device characterized in that an automatic call is made by detecting a dial tone using the signal tone detection method according to claim 1. (3) An automatic alarm device characterized in that a call destination is changed during automatic call origination by detecting a busy tone using the signal tone detection method according to claim 1. (4) An automatic alarm device characterized in that it detects the end of a called party's call during a call by detecting a busy tone using the signal tone detection method according to claim 1, and performs call end processing.