Signal Processing Device for Coaxial PTZ Control

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Solution Overview

Problem

The high cost of installing dedicated cables for PTZ control in monitoring camera systems increases the overall cost, as existing coaxial cables are not sufficient for performing PTZ control without additional infrastructure.

Innovation Solution

A signal processing device that generates and superimposes control signals for pan, tilt, and zoom functions onto video signals transmitted through a coaxial cable, allowing PTZ control without the need for new cables by adjusting transmission timing, frequency, or level to avoid interfering with the video signal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a dedicated cable (e.g., RS-485 cable) is installed for PTZ control, then PTZ control function is achieved, but installation cost increases significantly

Engineering Contradiction:

ImprovePTZ control functionVSAvoidinstallation cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent combines video signal transmission and control signal transmission into a single coaxial cable by superimposing the control signal on the video signal. This merging eliminates the need for separate dedicated control cables, thereby reducing installation cost while maintaining PTZ control functionality.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The coaxial cable is made multi-functional by enabling it to carry both video signals and control signals simultaneously. The control signal is modulated onto the video signal carrier, allowing one cable to perform multiple functions (video transmission and PTZ control) that traditionally required separate cables.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Device complexity

If control signal is superimposed on video signal, then one cable is used for both functions, but signal interference may occur

Engineering Contradiction:

Improvecable configurationVSAvoidsignal interference

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The control signal is superimposed only on specific portions of the video signal (horizontal synchronization signal section and/or color burst section) rather than the entire video signal. This localized superimposition ensures that control signals are transmitted without interfering with the main video content display, as these sections are not visible or are less critical for video quality.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The control signal is prepared and modulated onto the video signal carrier in advance before transmission. By pre-modulating the control signal onto appropriate frequency components of the video signal, the system ensures proper signal separation at the receiving end without interference during transmission.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS10250844B2Signal processing device and method

Publication Date: 2019.04.02 SONY SEMICON SOLUTIONS CORP

AI summary

There is provided a signal processing device including 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.