JP3222285B2 - TV door phone 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 television intercom apparatus, and more particularly to a television intercom apparatus capable of keeping a step interval of a horizontal synchronization pan-tilt operation on a television monitor constant.

[0002]

2. Description of the Related Art Conventionally, a TV door phone apparatus has been disclosed in FIG.
As shown in the figure, an entrance window with camera EQ11 that is provided with an imaging window W2 for a wide-angle lens and generates a video signal of a visitor imaged by the wide-angle lens, and a front terminal with camera EQ11 and a cable L11 at a cable terminal T11. It is composed of a connected indoor master unit EQ12.

In this indoor master unit EQ12, a cable L
The cable terminal T11 connected to the terminal 11 is connected from the slave unit interface 21 to the video signal amplifier 22.

The output side of the video signal amplifier 22 is connected to a video signal grid G 1 of a television monitor 38.

The output side of the video signal amplifier 22 is connected to a composite synchronizing signal separating circuit 23. The vertical synchronizing signal terminal 23a of the synchronizing synchronizing signal separating circuit 23 is connected to the vertical coil VC of the television monitor 38 via the vertical image width circuit 24a, the vertical scanning circuit 24, and the vertical deflection circuit 25 in order.

On the other hand, the horizontal synchronizing signal terminal 23b of the synthesizing synchronizing signal separating circuit 23 is connected to the oblique wave delay timing circuit 27 for determining the delay amount of the horizontal image width circuit 26 by the horizontal synchronizing terminal T.
Connected at 12.

A C to which the pan / tilt button unit 39 is connected
The PU 40 is connected to the vertical image width circuit 24a and to the oblique wave angle changing circuit 28 via the reference voltage setting terminal T14 of the horizontal image width circuit 26. The oblique wave angle changing circuit 28 is connected to the oblique wave delay timing circuit 27.

The output side of the oblique wave delay timing circuit 27 and the output side of the reference voltage circuit 30 are connected to the (-) input side and the (+) input side of the operational amplifier 29 for horizontal scanning positioning, respectively. The output side of the horizontal scanning positioning operational amplifier 29 is connected to the horizontal scanning circuit 3 from the positioning terminal T15.
4. It is connected to a horizontal coil HC of a television monitor 38 via a horizontal deflection circuit 35.

In this TV door phone apparatus, the camera-equipped entrance device EQ11 generates a video signal of a visitor captured by the wide-angle lens from the wide-angle lens imaging window W2, and converts the video signal from the child device interface 21 to the video signal amplifier 22. Send to

The video signal of the video signal amplifier 22 is input to a video signal grid G1 of a television monitor 38.

The video signal of the video signal amplifier 22 is
A vertical synchronizing signal is obtained from a vertical synchronizing signal terminal 23a which is input to a synthesizing synchronizing signal separating circuit 23, and is transmitted to a vertical scanning circuit 2 via a vertical image width circuit 24a controlled by the CPU 40.
4. The signal is input to the vertical coil VC of the television monitor 38 via the vertical deflection circuit 25.

On the other hand, the horizontal synchronizing signal obtained from the horizontal synchronizing signal terminal 23b of the synthesizing synchronizing signal separating circuit 23 is supplied to the horizontal picture width circuit 26 by the oblique wave delay timing circuit 27.
Is input to The oblique-wave delay timing circuit 27 receives an oblique-wave angle changing signal from an oblique-wave angle changing circuit 28 controlled by the CPU 40. Thus, the oblique wave whose angle has been changed is obtained from the oblique wave delay timing circuit 27. In the operational amplifier 29 for horizontal scanning positioning,
The oblique wave whose angle has been changed is compared with the reference voltage of the reference voltage circuit 30 to generate a horizontal scanning position signal. This horizontal scanning position signal is supplied to a horizontal scanning circuit 34 and a horizontal deflection circuit 35.
Through the horizontal coil HC of the television monitor 38.

[0013]

In such a television intercom apparatus, the horizontal synchronizing signal (FIG. 4) from the horizontal synchronizing signal terminal 23b of the composite synchronizing signal separating circuit 23 is transmitted from the horizontal synchronizing terminal T12 to the oblique wave delay timing circuit. 27 and the output forms an oblique wave (FIG. 4).
). The horizontal scanning positioning operational amplifier 29 compares the oblique wave with the reference voltage of the reference voltage circuit 30 to generate a horizontal scanning position signal (FIG. 4). The falling of this horizontal scanning position signal is the start of the pan / tilt cutout screen. Then, the pan / tilt button unit 39 is operated to control the oblique wave angle changing circuit 28 from the CPU 40 to change the oblique wave angle and vary the falling position of the horizontal scanning position signal (FIG. 4). By varying the falling position of the horizontal scanning position signal, the horizontal scanning position signal drives the horizontal scanning circuit 34 at the falling edge to generate a horizontal scanning signal (FIG. 4). It is input to the horizontal coil HC of the television monitor 38, and the pan / tilt horizontal drive is performed.

However, the oblique wave angle changing circuit 2
The waveform of the oblique wave formed by the oblique-wave delay timing circuit 27 under the control of 8 has a large horizontal time interval from time t1 to t3, even if the oblique wave angle W1 to W4 is changed at a constant interval.

As described above, the conventional TV intercom apparatus has a drawback that the step interval of the pan / tilt operation is not constant.

[0016]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a television intercom apparatus capable of fixing a step interval of a pan-tilt operation for horizontal synchronization of a television monitor, in order to solve such a problem. It is.

[0017]

In order to achieve this object, a television intercom apparatus according to the present invention includes a camera-equipped entrance device for generating a video signal of a visitor imaged by a wide-angle lens, and a camera-emission device. A video signal amplification circuit for amplifying a video signal, a synthesis synchronization signal separation circuit for separating vertical and horizontal synchronization signals from the video signal amplification circuit, A delay oblique wave generation circuit that synchronizes with the horizontal synchronization signal separated by the synchronization signal separation circuit and generates an oblique wave with a fixed angle after the elapse of a preset delay time, and a delay oblique wave generation circuit Horizontal scanning positioning operational amplifier for determining the clip position of the delayed oblique wave, a reference voltage changing circuit for changing the reference voltage of the horizontal scanning positioning operational amplifier, and a horizontal output from the horizontal scanning positioning operational amplifier. Period signal, and a television monitor demarcating out by combining synchronizing signal the vertical synchronizing signal separated from the separating circuit and the video signal amplified by the video signal amplifier circuit.

[0018]

In this TV intercom apparatus, a video signal of a visitor imaged by the wide-angle lens is generated by the entrance unit with camera. This video signal is amplified by the video signal amplifier circuit of the indoor master unit and sent to the composite synchronization signal separation circuit. The video signal is amplified by a video signal amplifier circuit provided in the indoor master unit, and the vertical and horizontal synchronization signals are separated from the amplified video signal.
Synchronized with the separated horizontal synchronizing signal, the oblique wave generation circuit generates an oblique wave having a constant angle. Further, the reference voltage of the positioning operational amplifier is changed by the reference voltage changing circuit, and the clip position of the delayed oblique wave generated by the delayed oblique wave generation circuit is determined. The horizontal synchronizing signal output from the horizontal scanning positioning operational amplifier, the vertical synchronizing signal separated from the synthesizing synchronizing signal separating circuit, and the video signal amplified by the video signal amplifying circuit are output from the television monitor to output the horizontal synchronizing signal. The step interval of the synchronized pan / tilt operation can be made constant.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a preferred embodiment of a television intercom apparatus according to the present invention.

In FIG. 1, a television door phone apparatus according to the present invention includes a camera-equipped entrance device EQ1 for generating a video signal of a visitor captured by a wide-angle lens, and an indoor master device EQ2 connected to the camera-equipped entrance device. And

The indoor master unit EQ2 includes a video signal amplifying circuit 2 for amplifying a video signal, and a composite synchronizing signal separating circuit 3 for separating vertical and horizontal synchronizing signals from the video signal amplifying circuit.
A delay oblique wave generation circuit 7 which generates an oblique wave having a fixed angle after a preset delay time in synchronization with the horizontal synchronizing signal separated by the synthetic synchronizing signal separating circuit; A horizontal scanning positioning operational amplifier 9 for determining a clip position of the delayed oblique wave generated by the generating circuit, a reference voltage changing circuit 10 for changing a reference voltage of the horizontal scanning positioning operational amplifier, and a horizontal scanning positioning operational amplifier. A television monitor 18 for outputting an image based on the output horizontal synchronizing signal, the vertical synchronizing signal separated from the composite synchronizing signal separating circuit, and the video signal amplified by the video signal amplifying circuit.

The camera-equipped entrance device EQ1 is provided with a wide-angle lens imaging window W1 and generates a video signal of a visitor imaged by the wide-angle lens. Entrance cordless handset with camera EQ1
Is connected to the indoor master unit EQ2 by a cable L1 at a cable terminal T1.

The indoor master unit EQ2 is connected to the video signal amplifier 2 via the slave unit interface 1 from the cable terminal T1 connected to the cable L1.

The output side of the video signal amplifier 2 is connected to the video signal grid G1 of the television monitor 18.

The video signal amplifier 2 is connected to a composite synchronizing signal separating circuit 3, and a vertical synchronizing signal terminal 3a of the synchronizing synchronizing signal separating circuit 3 has a vertical picture width circuit 4a controlled by the CPU 20.
The vertical scanning circuit 4 is connected to the vertical coil VC of the television monitor 18 via the vertical deflection circuit 5.

The horizontal synchronizing signal terminal 3b of the synchronizing synchronizing signal separating circuit 3 is connected to the delayed oblique wave generation circuit 7 from the horizontal synchronizing terminal T2 of the horizontal picture width circuit 6.

The output side of the delay oblique wave generation circuit 7 and the CPU
The output side of the reference voltage changing circuit 10 controlled via the reference voltage setting terminal T4 from the reference numeral 20 is connected to the (-) input side and the (+) input side of the operational amplifier 9 for horizontal scanning positioning, respectively. Note that the pan / tilt button unit 19 is
Connected to U20.

The output side of the horizontal scanning positioning operational amplifier 9 is connected from a positioning terminal T5 to a horizontal deflection circuit 15 via a horizontal scanning circuit 14, and the horizontal deflection circuit 15 is connected to a horizontal coil HC of a television monitor 18. .

In such a TV intercom apparatus,
The entrance unit with camera EQ1 generates a video signal of the visitor imaged by the wide-angle lens from the imaging window W1 for the wide-angle lens, and this video signal is transmitted via the cable L1 from the cable terminal T1 via the child device interface 1. The signal is sent to the video signal amplifier 2.

The video signal output from the video signal amplifier 2 is input to the video signal grid G1 of the television monitor 18.

On the other hand, a vertical synchronizing signal is obtained from the synthesizing synchronizing signal separating circuit 3 connected to the video signal amplifier 2, and from the vertical synchronizing signal terminal 3a via the vertical image width circuit 4a controlled by the CPU 20, the vertical scanning circuit 4, The signal is input to the vertical coil VC of the television monitor 18 via the vertical deflection circuit 5.

A horizontal synchronizing signal is obtained from the horizontal synchronizing signal terminal 3b of the synthesizing synchronizing signal separating circuit 3, and is input to the delay oblique wave generation circuit 7 from the horizontal synchronizing terminal T2 of the horizontal picture width circuit 6.

The output of the delay oblique wave generation circuit 7 and the CPU
The reference voltage of the reference voltage changing circuit 10 controlled via the reference voltage setting terminal T4 from the reference voltage setting terminal T4 is input to the (-) input side and the (+) input side of the operational amplifier 9 for horizontal scanning positioning, respectively, and is compared and calculated. To generate a horizontal scanning positioning signal.

The horizontal scanning positioning signal of the horizontal scanning positioning operational amplifier 9 is sent from the positioning terminal T5 to the horizontal scanning circuit 1.
4 is output as a horizontal scanning signal and is applied to a horizontal deflection circuit 15. The horizontal deflection signal from the horizontal deflection circuit 15 is input to a horizontal coil HC of a television monitor 18.

As shown in FIG. 2, when a horizontal synchronizing signal is inputted from the horizontal synchronizing signal terminal 3b of the composite synchronizing signal separating circuit 3 to the horizontal synchronizing terminal T2, the delay oblique wave generation circuit 7 delays by a certain time. Angle oblique waves are generated.

If the pan / tilt button unit 19 is operated by pan / tilt operation (refer to Japanese Patent Application No.
0174), the CPU 20 is a reference voltage changing circuit 10
Change the reference voltage of. The oblique wave and the reference voltage are compared and calculated by the operational amplifier 9 to determine the clipping position of the oblique wave delayed. From the terminal T5 of the operational amplifier 9, a horizontal scanning positioning signal is generated based on the clip position determined according to the reference voltage. The horizontal scanning position is determined by the horizontal scanning positioning signal. The horizontal scanning position is applied to the horizontal scanning circuit 14 to generate a horizontal deflection signal, which is input from the horizontal deflection circuit 15 to the horizontal coil HC of the television monitor 18.

As described above, the CPU 20 changes the reference voltage of the reference voltage changing circuit 10 by the pan / tilt operation of the pan / tilt button unit 19 to calculate the oblique wave having a constant angle delayed by a predetermined time in the delayed oblique wave generation circuit 7. The clip position of the delayed oblique wave is determined by the comparison operation in the amplifier 9, and the horizontal scanning positioning signal of the voltage determined according to the reference voltage is generated from the operation amplifier 9, so that the horizontal position in the television monitor is generated. The step interval of the synchronized pan / tilt operation can be made constant.

The television monitor 18 outputs an image based on the horizontal synchronizing signal output from the horizontal scanning positioning operational amplifier 9, the vertical synchronizing signal separated from the composite synchronizing signal separating circuit, and the video signal amplified by the video signal amplifying circuit. At this time, the step interval of the image output screen can be made constant by a pan / tilt operation.

[0039]

As is clear from the above description, according to the television door phone apparatus of the present invention, the step interval of the horizontal synchronization pan-tilt operation on the television monitor can be made constant.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a television door phone apparatus according to the present invention.

FIG. 2 is a time chart of the TV door phone apparatus according to the present invention.

FIG. 3 is a block diagram of a conventional TV door phone apparatus.

FIG. 4 is a time chart of a conventional TV door phone apparatus.

[Explanation of symbols]

 EQ1 ... Entrance unit with camera EQ2 ... Indoor master unit 2 ... Video signal amplifier circuit 3 ... Synthetic synchronous signal separation circuit ... (Oblique wave) Delayed oblique wave 7: Delay oblique wave generation circuit 9: Operational amplifier for horizontal scanning positioning 10: Reference voltage changing circuit 18 .... TV monitors

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-2-214392 (JP, A) JP-A-59-207177 (JP, A) JP-A-61-20419 (JP, A) JP-A 52-214 32627 (JP, A) Japanese Utility Model Showa 60-45537 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 7/18

Claims (1)

(57) [Claims] 1. An image of a visitor captured by a wide-angle lens
Entrance cordless handset with camera that generates signals(EQ1)And the mosquito
Indoor master unit connected to the entrance unit with camera(EQ2)With
The indoor master unit further includes a video signal amplifying the video signal.
Width circuit(2)Vertical and horizontal from the video signal amplifier circuit
Synthetic sync signal separation circuit for separating sync signals(3)And before
Same as the horizontal sync signal separated by the synthesized sync signal separation circuit.
At a fixed angle after the delay time set in advance.
Delayed oblique wave generation circuit for generating oncoming waves(7)And the delay
Delayed oblique wave generated by oblique wave generation circuit()Click
Operational Amplifier for Horizontal Scan Positioning that Determines Loop Position(9)
And the reference voltage of the operational amplifier for horizontal scanning positioning is changed.
Reference voltage change circuit(10)And the horizontal scanning position
Horizontal synchronizing signal output from the operational amplifier
Vertical sync signal separated from the sync signal separation circuit
Image output by the video signal amplified by the video signal amplifier circuit
TV monitor(18)WithBy TV
Step interval of pan-tilt operation of horizontal synchronization in Nita
ConstantTelevision doorphone device characterized by the above-mentioned.