JP5065229B2 - TV door phone device - Google Patents

Description

  The present invention relates to a television doorphone device that includes a slave unit with a camera and a master unit with a monitor and can make a call while checking a visitor with an image, and more particularly, the master unit with a monitor relates to a television doorphone device to which a fire detector or the like is connected. .

2. Description of the Related Art Conventionally, there is a television door phone device that includes a slave unit with a camera and a master unit with a monitor in order to improve a security function and can respond while confirming a visitor with an image. When the entrance cordless handset is equipped with a camera, a power source is required to drive the camera, but there is no place for powering around the entrance cordless handset. It is configured to be supplied from the monitor-equipped master unit via a transmission line for communication arranged therebetween.
Therefore, in the case of a TV door phone device, there is a risk of a fire if a short circuit occurs on this transmission line. If a short circuit occurs, a circuit that stops the supply of power from the monitor master unit to the camera slave unit is monitored. This detection operation is provided in the parent device, and is performed with the highest priority (see, for example, Patent Document 1).

In recent years, in order to improve security, a security device such as a fire detector is connected to the TV door phone device, and when a fire or the like is detected, an alarm sound is issued from the master unit with a monitor (for example, , See Patent Document 2).
However, in the case of a TV door phone device, when a short circuit occurs in the transmission line connecting the master unit with the monitor and the slave unit with the camera, the operation to stop the power supply in the master unit with the monitor is performed with the highest safety priority. Therefore, for example, even if a fire sensor connected to the monitor-equipped master unit operates, no alarm operation is performed in the state where a short circuit is detected.

  FIG. 2 shows an example of a circuit configuration of the conventional television door phone device configured as described above. Hereinafter, the flow of conventional priority control will be specifically described with reference to FIG. In FIG. 2, 40 is a slave unit with a camera, 41 is a master unit with a monitor, and L2 is a transmission line disposed between the slave unit with a camera 40 and the master unit with a monitor 41. 41 shows a state in which a first sensor (a life change sensor composed of a crime prevention sensor and a water amount sensor composed of human sensors) 43 and a house fire alarm (residential alarm) 45 are connected. .

  The monitor-equipped master unit 41 includes a priority encoder 47, a BCD decoder 48, a short detection circuit 49 that detects a short circuit in the transmission line L2, a power supply circuit 50 that supplies power to the camera-equipped slave unit 40, and outputs of the power supply circuit 50. A power switch circuit 51 for turning on / off, a first sensor IF 52 for connecting the first sensor 43, a house alarm IF 54 for connecting the house alarm 45, and the like, and a short detection circuit 49, a first sensor IF 52, and a second sensor IF 53 are provided. The home alarm device IF 54 outputs a signal to the priority encoder 47, and the priority encoder 47 is configured to output a signal to the BCD decoder 48.

  The priority encoder 47 is configured to output a signal in accordance with a preset truth table so that the detection signal of the short detection circuit 49 has the highest priority with respect to various input signals, and when receiving a signal from the short detection circuit 49 Regardless of other signal states, a power-off signal is output from the BCD decoder 48, the power switch circuit 51 is turned off, and the supply of power to the camera-equipped child device 40 is stopped. Then, the input of other signals is canceled.

  In this case, the priority order set in the priority encoder 47 is set, for example, as in the truth table shown in Table 1, and the short detection priority is set highest. Therefore, even when the first sensor 43, the second sensor 44, or the house alarm 45 detects and outputs a signal to the priority encoder 47 when the short detection circuit 49 is in operation, the output of the priority encoder 47 Does not change.

  However, when no short circuit occurs on the transmission line L2, for example, when the first sensor 43 performs a detection operation, a signal is input to the priority encoder 47 via the first sensor IF 52 and decoded by the BCD decoder 48. The generated output activates the alarm sound generation circuit 56 and outputs an alarm sound from the speaker 57. This alarm sound can be stopped by pressing the alarm sound recovery switch 58.

Japanese Patent Laid-Open No. 2002-112251 JP 2001-86489 A

As mentioned above, the conventional TV door phone device has a higher priority for the output of the short detection signal than the alarm issuance by the sensor detection operation. In this case, the supply of power is immediately stopped, but the alarm signal by the sensor operation is not output during the stop.
However, even if the transmission line L2 between the camera-equipped slave unit 40 and the monitor-equipped master unit 41 is short-circuited, there is no safety problem if the power supplied to the camera-equipped slave unit 40 is quickly stopped. The operation of 41 itself may be continued. That is, the operation of issuing an alarm when a signal from the sensor is received may be continued.

  Therefore, the present invention provides a TV door phone device that performs control according to a signal for any signal while maintaining the priority when a high priority signal and a low priority signal are input. It is aimed.

  In order to solve the above-mentioned problems, the invention of claim 1 includes a slave unit with a camera and a master unit with a monitor, wherein the monitor-main unit has a plurality of abnormality detection means such as a security sensor and a life change sensor, and a fire. In a TV door phone device to which emergency detection means such as a sensor is connected, the monitor-equipped master unit is provided between a power supply circuit that supplies power to the camera-attached slave unit and the camera-attached slave unit and the monitor-attached master unit. A short detection circuit for detecting a short circuit of the installed transmission line, a priority encoder for performing predetermined priority control on each detection signal of the abnormality detection means, emergency detection means, and short detection circuit, and an output of the priority encoder Decoding BCD decoder, abnormality detection means, emergency detection means, mask circuit for inputting output signal of short detection circuit to priority encoder, and output of BCD decoder The priority encoder outputs a signal for turning off the power supply circuit as a priority signal when the short detection circuit outputs a short detection signal, and the mask circuit includes a flip-flop circuit for holding and resetting the signal. Even when a short detection signal is being input, the output signal of the flip-flop circuit is received and the short detection signal is masked. When the abnormality detection means or emergency detection means detects, the warning signal is sent to the priority encoder. It is characterized by outputting.

  According to this configuration, the priority of control when a short circuit is detected is the highest. Therefore, no matter what the control state of the TV door phone device is, if the short circuit occurs on the transmission line, the power supply is surely shut off immediately. Perform the action. Since the mask circuit masks the signal, predetermined control can be performed even for other low priority signals. Therefore, while the short detection is continuing and the power supply stop control is continued, the alarm sound can be generated by the sensor operation, and the control according to the signal is continuously performed for any signal, Security can be maintained.

According to a second aspect of the present invention, in the first aspect of the present invention, the monitor-equipped master unit has a sound report unit for receiving a detection signal from the abnormality detection means or the emergency detection means and reporting a warning sound. An alarm sound recovery switch for stopping the sound is provided, and the alarm sound recovery switch is connected to a reset terminal of the flip-flop circuit.
According to this configuration, the alarm sound can be stopped and the recovery operation can be performed without using the CPU, and the configuration can be made inexpensively.

  According to the present invention, since the priority of control when a short circuit is detected is the highest, even if the TV door phone device is in any control state, if the short circuit occurs on the transmission line, the power supply is surely and immediately shut off. Perform the action. Since the mask circuit masks the signal, predetermined control can be performed even for other low priority signals. Therefore, while the short detection is continuing and the power supply stop control is continued, the alarm sound can be generated by the sensor operation, and the control according to the signal is continuously performed for any signal, Security can be maintained. Moreover, it can be implemented without using a CPU and can be configured at low cost.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an example of a television door phone device according to the present invention, and the main parts are shown as circuit blocks. In FIG. 1, 1 is a slave unit with a camera, and 2 is a master unit with a monitor. The monitor-equipped master unit 2 is connected to a first sensor 3 such as a crime prevention sensor and a life change sensor, and a residential fire alarm (residential alarm) 5 including a fire detector. The slave unit with camera 1 and the master unit with monitor 2 are connected by a transmission line L1.

  The camera-equipped handset 1 picks up a microphone 8 and a speaker 9 for calling, a microphone amplifier 8a for amplifying the sound collected by the microphone 8, a speaker amplifier 9a for amplifying sound to be reported from the speaker 9, and a visitor. For example, a modulation circuit 11 that modulates a video signal into a signal that can be transmitted via the transmission line L1, a slave unit interface (slave unit IF) 12 for communicating with the monitor-equipped master unit 2, and the like.

  The base unit with a monitor 2 includes a microphone 15 and a speaker 16 for making a call, a microphone amplifier 15a for amplifying a sound collected by the microphone 15, a speaker amplifier 16a for amplifying a sound to be reported from the speaker 16, and a captured image of the camera 10 LCD 17 for displaying the alarm, demodulating circuit 18 for demodulating the video signal transmitted from the camera-equipped slave unit 1 on the LCD 17, alarm sound generating circuit 19 for reporting the alarm sound from the speaker 16, and stopping the alarm sound Alarm sound recovery switch 20, base unit interface (base unit IF) 21 for communicating with camera-equipped slave unit 1, first sensor interface (first sensor IF) 23 to which the first sensor 3 is connected, residence police 5 is connected to a home alarm device interface (home alarm device IF) 25, a short detection circuit 26 that detects a short circuit of the transmission line L1, A mask circuit 27 for masking a high signal when it is input, a priority encoder 28 for outputting a signal having a predetermined priority with respect to the input of various signals, and a BCD decoder for demodulating the output signal of the priority encoder 28 29, a flip-flop circuit 30 for holding the output signal of the BCD decoder 29, a power supply circuit 31 for supplying power to the camera-equipped slave unit 1, a power switch circuit 32 for turning on / off the output of the power supply circuit 31, and the like. Yes.

  The television door phone device having the above-described configuration operates as follows. However, when a call button (not shown) of the camera-equipped slave unit 1 is operated, a ringing tone is reported by the monitor-equipped master unit 2, and when a predetermined response operation is performed on the monitor-provided master unit 2, a call between the visitor and the resident The operation of enabling the camera 10 and the operation of starting the camera 10 in conjunction with the calling operation and displaying the visitor video on the LCD 17 are the same as in the prior art, and thus the description thereof is omitted. Here, a short circuit on the transmission line L1 is performed. The operation when (short circuit) occurs will be described.

  First, the priority encoder 28 is set to output signals A0 and A1 according to the truth table shown in Table 1 for four inputs 0 to 3.

  In this setting state, when a short circuit occurs on the transmission line L1 in a standby state where no sensor signal is input, the short detection circuit 26 detects and operates to output a short detection signal to the mask circuit 27. . On the other hand, since the D1-D4 output signal (Q inverted signal) of the flip-flop circuit 30 is in the “1” state when the monitor-equipped master unit 2 is in the standby state, the mask that has received the input of the short detection signal The AND circuit of the circuit 27 outputs a signal “1”. Thus, the signal “1” is input to the third input terminal of the priority encoder 28.

From the truth table of Table 1, the third input terminal of the priority encoder 28 is the terminal with the highest priority, and the signal A0 is “1” and A1 is “1” according to the truth table, and is output to the BCD decoder 29. . The BCD decoder 29 outputs the decoded signal, and the signal latched by the flip-flop circuit 30 is output.
Thus, “1” is output from the third output terminal of the BCD decoder 29, the power-off signal S1 is output from the flip-flop circuit 30, and the power switch circuit 32 is turned off to hold the state. As a result, the power supply to the camera-equipped slave unit 1 is stopped and the state is maintained.

Then, the Q inversion signal D1 of the flip-flop circuit 30 in the “0” state is input to the mask circuit 27. Thus, the input at the third input terminal of the priority encoder 28 becomes “0”, the priority control is canceled, and another signal input is permitted.
For this reason, immediately after the short detection circuit 26 detects a short circuit, for example, when a detection signal is input from the home alarm 5, the mask circuit 27 outputs a signal “1” to the second input terminal of the priority encoder 28. As a result, according to the truth table of Table 1, the output A0 is “0”, the output A1 is “1”, and “1” is output from the second output terminal of the BCD decoder 29. That is, the alarm generation signal S2 is output, the alarm sound generation circuit 19 is activated, and the alarm sound is emitted from the speaker 16.
When the short-circuit state of the transmission line L1 is resolved, a reset signal is input to the reset terminal of the flip-flop circuit 30 connected to the third output terminal of the BCD decoder 29. As a result, the output of the power-off signal S1 is stopped.

  The alarm sound emitted from the speaker 16 can be stopped by operating the alarm sound recovery switch 20. The output signal of the alarm sound recovery switch 20 is configured to be input to the reset terminal of the flip-flop circuit 30, and the reset signal is input to all the sensors 3 and 5 of the flip-flop circuit 30 by the operation of the alarm sound recovery switch 20. Is done. As a result, the alarm generation signal stops and the alarm sound stops. Further, the inverted Q signals D2 to D4 of the flip-flop circuit 30 are transmitted to the associated sensor signal input unit of the mask circuit 27, and the output of the mask circuit 27 is reset.

Although the case where the short detection circuit 26 operates in the standby state has been described above, for example, when the short detection circuit 26 detects a short while the first sensor 3 is operating and outputting a detection signal. The operation will be described next.
First, when “1” is input from the first sensor IF 23, the priority encoder 28 outputs a signal whose output A0 is “1” and output A1 is “0” from the truth table of Table 1. As a result, the BCD decoder 29 outputs “1” at the first output terminal, outputs “0” at the other output terminals, the alarm generation signal S3 is output from the flip-flop circuit 30, and the alarm sounds.

  In this state, when a short detection signal is output from the short detection circuit 26, “1” is input to the third input terminal of the priority encoder 28. As described above, since this input terminal has the highest priority, “1” is output from the third output terminal of the BCD decoder 29, the power switch circuit 32 is turned off, and the power supply to the camera-equipped slave unit 1 is performed. Stopped. Further, since the other output terminals of the BCD decoder 29 are maintained in the immediately previous state, the alarm sound continues.

  In this way, since the priority of control when a short circuit is detected is the highest, no matter what the control state of the TV door phone device is, if a short circuit occurs on the transmission line, the power shut-off operation is surely performed immediately. Do. Since the mask circuit masks the signal, predetermined control can be performed even for other low priority signals. Therefore, while the short detection is continuing and the power supply stop control is continued, the alarm sound can be generated by the sensor operation, and the control according to the signal is continuously performed for any signal, Security can be maintained. Further, in addition to this control, the recovery operation for stopping the alarm sound is also performed using a flip-flop circuit or the like without using the CPU, so that it can be configured at low cost.

In the embodiment described above, the first sensor IF 23, the house alarm device IF 25, and the master unit 2 with a monitor capable of inputting two sensor signals have been described. However, more sensor connections may be provided, and a short circuit detection may be provided. If the priority encoder 28 is set so that the highest priority control is performed on the detection signal of the circuit 26, the same control can be performed.
Also, when a short circuit is detected, an alarm sound may be generated as in the case of the sensor operation, and the alarm sound is not only generated by the monitor base unit 2 but also simultaneously issued by the camera base unit 1. You may let me know.

It is a block diagram which shows an example of the television door phone apparatus which concerns on this invention. It is a block diagram of the conventional television door phone apparatus.

Explanation of symbols

  1 .. Slave unit with camera, 2 .. Base unit with monitor, 3 .. 1st sensor, 5 .. House fire alarm, 16 .. Speaker (reporting sound part), 20 .. Alarm sound recovery switch, 26 ..Short detection circuit, 27 ..Mask circuit, 28 ..Priority encoder, 29 ..BCD decoder, 30 ..Flip-flop circuit, 31 ..Power supply circuit, 32 ..Power switch circuit, L1. .

Claims (2)

A TV door phone comprising a slave unit with a camera and a master unit with a monitor, wherein the monitor master unit is connected to a plurality of abnormality detection means such as a security sensor and a life change sensor and an emergency detection means such as a fire detector. In the device
The monitor base unit is a power supply circuit that supplies power to the camera slave unit;
A short detection circuit for detecting a short of a transmission line disposed between the slave unit with a camera and the master unit with a monitor;
A priority encoder that performs predetermined priority control on each detection signal of the abnormality detection means, the emergency detection means, and the short detection circuit;
A BCD decoder for decoding the output of the priority encoder;
A mask circuit for inputting an output signal of the abnormality detection means, the emergency detection means, and the short detection circuit to the priority encoder;
A flip-flop circuit for holding and resetting the output signal of the BCD decoder,
The priority encoder outputs a signal for turning off the power supply circuit as a priority signal when the short detection circuit outputs a short detection signal,
The mask circuit receives an output signal of the flip-flop circuit even if the short detection signal is being input, masks the short detection signal, and if the abnormality detection means or the emergency detection means performs a detection operation, an alarm is issued. A television door phone device that outputs a signal for reporting to the priority encoder. The monitor-equipped master unit has a sound alarm unit for reporting a warning sound in response to a detection signal from the abnormality detection means or the emergency detection means, and has a warning sound recovery switch for stopping the warning sound, 2. The TV door phone apparatus according to claim 1, wherein the alarm sound recovery switch is connected to a reset terminal of the flip-flop circuit.

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