Video Camera Monitor Tally Lamp Control via REC RUN Time Code
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Solution Overview
Problem
Video cameras without tally signal output terminals pose difficulties in providing a tally display to external view finders or monitors, requiring troublesome wiring and limiting their use in broadcast settings.
Innovation Solution
A video camera monitor with a camera video input unit and a tally display controller that utilizes the REC RUN time code within the camera video signal to control the tally display, eliminating the need for additional wiring and enabling tally lamp activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tally input terminal is provided on the view finder, then the tally lamp can be turned on during recording, but small video cameras without tally signal output terminals cannot provide tally signals
Solution Approach 1:
The invention introduces a tally display controller as an intermediary device that receives video signals from cameras without tally output terminals and extracts REC RUN time code information from these signals to control the tally display. This mediator enables tally functionality between incompatible devices.
Solution Approach 2:
The invention replaces the mechanical/wiring-based tally signal transmission system with an electronic signal processing system that extracts recording status information from the video signal's time code, eliminating the need for separate tally signal wiring.
2Reliability
If wiring is provided to connect the view finder to the camera for tally signals, then the tally lamp can be controlled, but the wiring becomes troublesome and complex
Solution Approach 1:
The invention merges the tally signal transmission function with the existing video signal transmission path by extracting REC RUN time code information from the video signal, eliminating the need for separate tally signal wiring and reducing overall system complexity.
Solution Approach 2:
The video signal cable is given multiple functions: it simultaneously transmits both the video signal and the REC RUN time code information needed for tally display, making the single cable universally functional for both purposes.
3Reliability
If expensive dedicated view finders with tally functionality are used, then the tally display is reliable, but the cost increases significantly
Solution Approach 1:
The invention enables ordinary video cameras and standard view finders to provide tally functionality through themselves by processing the REC RUN time code already present in their video signals, without requiring expensive dedicated tally equipment or specialized cameras.
Data Source
AI summary
There is provided a video camera monitor that is capable of turning on a tally lamp without troublesome wiring even when a video camera does not have a tally signal output terminal. The present invention provides a video camera monitor that includes a camera video input unit and a tally display controller. The camera video input unit receives a camera video signal including a REC RUN time code, and the tally display controller controls tally display. The tally display controller controls the tally display based on whether the REC RUN time code is being advanced.