Monitoring camera system and control method for monitoring camera system

1. A signal processing device comprising:

a signal generation unit that generates a control signal for controlling an imaging device connected via one cable;

a signal superimposition unit that superimposes the control signal generated by the signal generation unit on a video signal received from the imaging device via the cable without an influence on display of a video corresponding to the video signal; and

a transmission unit that transmits the signals superimposed by the signal superimposition unit to the imaging device via the cable

wherein the control signal is superimposed on the video signal by adjusting transmission frequency or the level of the control signal and

wherein the signal generation unit generates the control signal at a frequency other than a reference frequency of a color difference signal of the video signal.

2. The signal processing device according to claim 1 , wherein the signal generation unit generates the control signal for controlling at least one of pan, tilt, and zoom of the imaging device.

3. The signal processing device according to claim 2 ,

wherein the signal superimposition unit superimposes the control signal generated by the signal generation unit on a color burst section of the video signal.

4. The signal processing device according to claim 2 ,

wherein the signal generation unit generates the control signal at a level lower than a noise of the video signal, and

wherein the signal superimposition unit superimposes the control signal generated by the signal generation unit on the entire video signal.

5. The signal processing device according to claim 1 , further comprising:

a recording control unit that controls recording of the video signal.

6. The signal processing device according to claim 1 , further comprising:

a display control unit that controls display of the video signal.

7. The signal processing device according to claim 1 ,

wherein the signal superimposition unit superimposes the control signal generated by the signal generation unit on a color burst section of the video signal.

8. The signal processing device according to claim 1 ,

wherein the signal generation unit generates the control signal at a level lower than a noise of the video signal, and

wherein the signal superimposition unit superimposes the control signal generated by the signal generation unit on the entire video signal.

9. A signal processing method performed by a signal processing device, the method comprising:

generating a control signal for controlling an imaging device connected via one cable;

superimposing the generated control signal on a video signal received from the imaging device via the cable; and

transmitting the superimposed signals to the imaging device via the cable,

wherein the control signal is superimposed on a color burst section of the video signal by adjusting transmission frequency or the level of the control signal.

10. A signal processing device comprising:

a signal generation unit configured to generate a control signal for controlling a device connected via one cable;

a signal superimposition unit configured to superimpose the control signal generated by the signal generation unit on a video signal received via the cable; and

a transmission unit configured to transmit the signal superimposed by the signal superimposition unit to the device to be controlled via the cable,

wherein the signal generation unit is configured to generate the control signal at a level lower than a noise level of the video signal, and

wherein the signal superimposition unit is configured to superimpose the control signal on the entire video signal.