JPH03150990A - Camera control device - Google Patents

Abstract

PURPOSE:To constitute the whole at a low cost by collecting all signal lines, and also, selecting plural cameras by a DTMF signal. CONSTITUTION:A DTMF signal Sc is sent to slave units 21-29 and camera 31-39 from a master unit 1, and from the camera of the corresponding slave unit of this DTMF signal Sc, its video signal Sy is sent. That is, the camera is selected by the DTMF signal Sc. Also, an FM signal Su sent to the master unit from the slave unit 21, an FM signal Sd sent to the slave unit 21 from the master unit 1, a video signal Sy sent to the master unit 1 from the camera 31, and an operating voltage sent to the slave unit 21 from the master unit 1 are all sent through a common line 12, therefore, the wiring between the master unit 1 and the slave unit 21 is simplified. In such a way, the whole is constituted at a low cost.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a camera control device.

[Summary of the invention]

The present invention enables a camera control device to be configured as a whole at low cost by combining all signal lines and selecting a plurality of cameras using DTMF signals.

[Conventional technology]

For example, a security system that allows you to select multiple video cameras installed at the front door, back entrance, etc. from a base unit installed in the living room, etc., and display images from the selected video cameras on the display of the base unit. Several systems are being considered.

[Problem to be Solved by the Invention] However, in these systems, when the base unit selects a video camera, it sends a command signal with a complicated bit configuration to the video camera. has to be sent out, making it expensive.

Furthermore, when used in combination with an intercom, a signal line for the video camera and a signal line for the intercom are required, resulting in an increase in the number of signal lines.

Furthermore, the power line to the video camera must also be considered.

This invention attempts to solve the above problems.

[Means to solve the problem]

Therefore, in the present invention, an audio signal is sent from the base unit of the intercom to one of the plurality of slave units through a common line, and an audio signal is sent from one of the plurality of slave units to the base unit through the common line. A signal is sent, a DTMF signal is sent from the base unit to the plurality of video cameras through the common line, the number indicated by this DTMF signal is compared with the number assigned to that video camera, and the number indicated by the DTMF signal is compared with the number assigned to the video camera.
The camera control device is such that a video signal from a video camera whose number indicated by the TMF signal matches the assigned number is sent to the base unit through the common line.

[Effect]

A plurality of video cameras can be arbitrarily selected with a simple configuration and a minimum number of signal lines.

〔Example〕

In the example shown in Figure 1, up to nine video cameras can be controlled from the base unit, where (1) is the base unit, (21
) to (29) are intercom slave units, (31) to (39)
) indicates a video camera. In this case, child 11 (21)
~ (29) and cameras (31) ~ (39), those with the same lower finger of the reference numerals form a pair, and the device numbers of these paired handsets and cameras are rl , ~ "9". For example, the handset (21) and camera (31) are a pair, and their device number is rl
, is.

Furthermore, handsets (21) to (29) and cameras (31) to
(39) have the same configuration and operation, so when there is no need to distinguish between these configurations and operations, the handset (21) and camera (31) will be representatively explained.

In the base unit (1), (110) is a transmitting circuit;
(120) is a receiver circuit, (130) is a video circuit, (1
40) represents a control circuit, and (149) represents a controller configured by, for example, a microcomputer. Also, (191) is an AC adapter, and this adapter (19
1) converts a 1oov commercial AC voltage into, for example, a 14V DC voltage, and this DC voltage is converted to a constant voltage circuit (19V).
After being stabilized in step 2), it is supplied to each circuit of this base unit (1) as their operating voltage.

Furthermore, the DC voltage from this constant voltage circuit (192) is
High output impedance buffer circuit (193) such as a constant current circuit → terminal (115) of main unit (1) → line (
12) -> Terminal (221) of slave unit (21) -> High input impedance buffer circuit (291) is supplied to the constant voltage circuit (292), and this constant voltage circuit (29
The output voltage of 2) is supplied to each circuit of the child device (21) as their operating voltage.

In addition, in the handset (21), (210) is a transmitting circuit;
(220) indicates a receiver circuit, (240) indicates a control circuit,
(249) is a controller composed of, for example, a microcomputer.

When in the standby state, the controller (149) controls the amplifier (1) in the base unit (1).
24) muting is turned on, and
The operation of the FM modulation circuit (113) is prohibited.

In addition, when in the standby state, the controller (249) also controls the amplifier (22) in the slave unit (21).
4) muting is turned on, and F
The operation of the M modulation circuit (213) is prohibited. Furthermore, the camera (31) is not supplied with its operating voltage by the controller (249).

However, for example, if a visitor presses the doorbell button (switch)
When (241) is pressed, a trigger pulse pt is output from the trigger circuit (242) according to the switch output, and this pulse Pt is supplied to the controller (249) to notify that the button (241) has been pressed. . Then, a control signal from the controller (249) turns off the muting of the amplifier (224) and permits the operation of the FM modulation circuit (213).

Further, the pulse Pt is supplied to a melody circuit (243) to form a melody signal indicating that the button (241) has been pressed, and this signal is supplied to a speaker (225) through an amplifier (224). Speaker (225
), a melody indicating that the button (241) has been pressed is played for a fixed period of time each time the button (241) is pressed.

Further, in the controller (249), a predetermined control signal is formed, and this signal is supplied to the DTMF signal encoder (248), which is a DTMF signal that indicates the complement of the device number of the handset (and camera) to "10". signal S signal S
In the case of acid, the device number of the slave unit (21) is "1", so "
The DTMF signal S signal S indicating "9" is output.

The DTMF signal S signal is then supplied to the FM modulation circuit (213) through the S signal amplifier (212), for example, the second
As shown in the figure, FM with a carrier frequency of 5.5MHz
It is converted into a signal Su.

Then, this signal Su is filtered through a bandpass filter (214
) → Terminal (221) → Line (12) → Terminal (115)
→The signal S is supplied to the FM demodulation circuit (123) through the signal line of the band pass filter (122), and the original DTMF signal S is outputted, and this signal Ss is supplied to the DTMF signal decoder (145), and The decoded output is supplied to the controller (149) and the device number "
The controller (149) is notified that the DTMF signal S signal S has become weak from the handset (21) of "1".

Then, the melody circuit (
A trigger pulse is supplied to the speaker (146) to form a melody signal, which signal is supplied to the speaker (148) through the amplifier (147) and thus the speaker (14).
8), a melody indicating that the button (241) has been pressed is played for a fixed period of time each time the button (241) is pressed.

Therefore, for example, when a householder picks up the handset (lot), the hook switch (144) goes into the off-footer state, and the controller (149)
), and based on this detection result, the operation of the FM modulation circuit (113) is permitted, and the amplifier (1
24) muting is turned off.

Then, the microphone (1) of the handset (101)
11), the voice signal St is transmitted from the microphone (111) to the modulation circuit (112) through the amplifier (112).
13) and is converted into an FM signal Sd with a carrier frequency of 6.5 MHz, as shown in FIG. 2, for example.

Then, this signal Sd is filtered through a bandpass filter (114
) → Terminal (115) → Line (12) → Terminal (221)
→It is supplied to the FM demodulation circuit (223) through the signal line of the band pass filter (222), and this demodulation circuit (2
23), the audio signal St is taken out.

This signal St is then supplied to the speaker (225) through the amplifier (224), and therefore the speaker (
225) outputs the voice spoken to the handset (111).

At this time, other handsets (22) to (29) also have FM.
Although the signal Sd is being supplied, these slave units (22) ~
In (29), since the button (241) is not pressed, the muting of the amplifiers (212) and (224) is on, and the operation of the FM modulation circuit (213) is prohibited. Therefore, handset (22) to (2
No sound is output from the speaker (225) of 9), and no signals are sent from the handsets (22) to (29).

For example, a visitor may use the microphone (21) of the cordless handset (21).
1), the audio signal Sr is transmitted to the microphone (
from the modulation circuit (211) through the amplifier (212).
3), and as in the case of the DTMF signal Ss, the FM
It is converted into a signal Su and sent to the base unit (1), and the audio signal Sr is extracted from the demodulation circuit (123). This extracted signal Sr is then supplied to the receiver (125) of the handset (101) through the amplifier (124).

Therefore, it is possible to make a phone call between a family member and a visitor.

Also, at this time, if the householder presses the "l" key corresponding to the device number "1" of the handset (21) among the dial keys (141), the key output will be sent to the DTMPT encoder (
142) and is converted to a DTMFT signal Sc indicating "1", and this signal Sc is supplied to a modulation circuit (113) through an amplifier (143) and converted to an FM signal Sd as in the case of the audio signal St. The DTMPT signal Sc is then sent to the slave device (21), and the DTMPT signal Sc is taken out from the demodulation circuit (223).

Then, this extracted signal Sc is supplied to the decoder (245) of the DTMFT number and is sent to the device number rl.

A signal indicating the
49), is compared with its own device number, and is sent to the slave device (
In 21), the device number "1" indicated by the signal matches the own device number "1", so the encoder (24B) is controlled by the controller (249) and the button (241) is pressed. In the same way as before, a DTMF signal Ss indicating "9" is generated, and this signal Ss is converted into an FM signal Su and then sent to the main unit (through the line (I2)).
1).

Then, this signal Su is demodulated in a demodulation circuit (123) to take out a signal Ss, this signal Ss is decoded in a decoder (145), and the decoded output is supplied to the controller (149) and sent to the slave unit (21). It is confirmed that the DT liver double signal Sc was sent.

Furthermore, in the handset (21), the controller (24
9), the switch circuit (231) is turned on, and the output voltage of the constant voltage circuit (292) is changed to the switch circuit (231).
) through the camera (3) as its operating voltage.

Therefore, the camera (31) is in an operating state, and a video signal Sy is taken out from an image sensor (331) constituted by, for example, a CCD sensor, and this signal Sy is supplied to a processing circuit (333) through a preamplifier (332). Processing such as gamma correction and AGC is performed, and the processed signal Sy is sent from the buffer amplifier (334) to the terminal (221) without changing the baseband, as shown in Figure 2.
→ Line (12) → Terminal (115) → Buffer amplifier (
132) → Video amplifier (133) → Video output circuit (13
4) is supplied to the picture tube (135) through the signal line.

Therefore, the visitor is displayed on the picture tube (135).

In addition, in other handsets (22) to (29), the sent DT? Since the device number "1" indicated by the IF signal Sc is the same as the own device number, the cameras (32) to (3)
9) are not energized and therefore from them to the parent unit (1)
No video signal sy is sent to .

Then, when the call ends, press the dial key (141).
When you press the "*" key, the encoder (142) will output "*".
” key is output, or when the handset (101) is on-hook, the controller (149) is activated based on the output of the hook switch (144).
) controls the encoder (142) and outputs the DTMFT number Sc indicating the "*" key. Then, this signal Sc is converted into an FM signal Sd and sent to the slave unit (21), and the decoder (245) of the slave unit (21) outputs “*”.
The decoded output of the key DTMFT number Sc is taken out,
This output signal is supplied to the controller (249).

Then, the controller (249) controls the amplifier (21).
2), the muting of (224) is turned on, the operation of the modulation circuit (213) is prohibited, and further,
The switch circuit (231) is turned off and the camera (31)
The power supply to is stopped.

Therefore, the main device (1), the child device (21) and the camera (3
1) means that the device has entered the standby state again.

Also, when you are not making a call using handsets (21) to (29), you can use the dial key (141) to switch to the camera (31).
When specifying the device number of ~(39), the corresponding camera is energized in the same way, and the captured video signal sy
is supplied to the picture tube (135), and its imaged screen is displayed on the picture tube (135). In this case, by supplying the decoded output of the DTMF signal Sc indicating the device number from the decoder (245) to the controller (249), the muting of the amplifier (212) is turned off and the modulation circuit (213) is permitted.

〔Effect of the invention〕

Thus, according to the present invention, the DTMF signal Sc is transmitted from the base unit (1) to the slave units (21) to (29) and the camera (31).
~(39), and the video signal sy is sent from the camera of the slave unit to which this DTMF signal Sc corresponds.In other words, the camera is selected by the DTMF signal Sc, and the DTMF signal The encoder and decoder are widely used in button-type telephones and are inexpensive, so the entire device can be made low-cost.

Furthermore, the FM signal Su sent from the slave unit (21) to the base unit (1), the FM signal Sd sent from the base unit (1) to the slave unit (21), and the FM signal Sd sent from the camera (31) to the base unit (1). The video signal sy sent to the base unit (1) and the operating voltage sent from the base unit (1) to the slave unit (21) are all sent through a common line (12), so there is no connection between the base unit (1) and the slave unit (21). In addition to simplifying the wiring, the overall cost can also be reduced from this point of view.

In addition, the operating voltage of the handset (21) and camera (31) is
Since power is supplied from the base unit (1), the slave unit (21) and camera (31) can be installed even if there are no power outlets around them. Moreover, the operating voltage supplied from the master unit (1) to the slave unit (21) and camera (31) is also sent through a common line (12).

Furthermore, the camera (31) to (
39), the selection can also be made from a button-type telephone.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an example of the present invention, and FIG. 2 is a diagram for explaining the same. (1) is the master unit, (21) to (29) are slave units, (31) to
(39) is a video camera, (101) is a handset,
(110), (210) are transmitter circuits, (120), (2
20) is a receiver circuit, (130) is a video circuit, (140)
), (240) are control circuits.

Claims (1)

[Claims] 1. An audio signal is sent from the base unit of the intercom to one of the plurality of slave units through a common line, and an audio signal is sent from one of the plurality of slave units to the base unit through the common line. A DTMF signal is sent from the base unit to the plurality of video cameras through the common line, the number indicated by this DTMF signal is compared with the number assigned to that video camera, and the number indicated by the DTMF signal is compared with the number assigned to that video camera. A camera control device in which a video signal from a video camera whose number matches the assigned number is sent to the base unit through the common line. 2 Operating voltage is supplied from the intercom base unit to the multiple handsets and multiple video cameras through a common line, and an audio signal is sent from the base unit to one of the multiple handsets through the common line. An audio signal is sent from one of the plurality of slave units to the base unit through the common line, a DTMF signal is sent from the base unit to the plurality of video cameras through the common line, and the DTMF signal The number indicated by is compared with the number assigned to that video camera, and the video signal from the video camera whose number indicated by the DTMF signal matches the assigned number is transmitted to the base unit through the common line. A camera control device that sends data to the camera.