IP Library › Granted Patent US 7,750,976
Granted Patent B2
US 7,750,976 · App. 11/323,337 · Granted Jul 6, 2010

Automatic video detector

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Quick Facts
Patent No.
US 7,750,976
App. No.
11/323,337
Granted
Jul 6, 2010
Kind
B2
Abstract

An automatic Video Detector (“AVD”) for detecting the transmission format of a received video signal is disclosed. The AVD may include a video detector array module and a state machine. The video detector array module may include a video line detector and a sub-carrier frequency detection module in signal communication with the video line detector.

Claims (17)

1. An Automatic Video Detector (“AVD”) comprising:

a video detector array module generating two or more transmission metrics of a received video signal for a predetermined amount of time; and

a state machine in signal communication with the video detector array module and detecting a transmission format of the received video signal based on the generated metrics;

wherein the video detector array module includes a video line detector and a sub-carrier frequency detection module, wherein the video detector array module further includes a sub-carrier alternating phase detector, and wherein the video detector array module further includes a blank detector.

2. The AVD of claim 1 , wherein the video detector array module further includes a black detector.

3. The AVD of claim 1 , wherein the video detector array module further includes a user programmable NTSC selector.

4. The AVD of claim 1 , wherein the video detector array module further includes a user programmable PAL selector.

5. A method for detecting the transmission format of a received video signal, the method comprising:

detecting at least two transmission metrics from a plurality of transmission metrics; and

decoding the transmission metrics with a state machine to determine the transmission format of the received video signal if the transmission metrics are stable over time;

wherein decoding includes monitoring the at least two transmission metrics with the state machine and determining the transmission format of the received video signal in response to monitoring the at least two transmission metrics, wherein monitoring includes monitoring the at least two transmission metrics for a predetermined amount of time with the state machine, wherein determining the transmission format further includes determining if the detected at least two transmission metrics are stable within the predetermined amount of time, wherein detecting the at least two transmission metrics includes detecting the number of lines of the received video signal and detecting a sub-carrier frequency of the received video signal, further including detecting another transmission metric, wherein the other transmission metric is one of a blank level and a black level.

6. The method of claim 5 , wherein the other transmission metric is sub-carrier phase alternation.

7. The method of claim 6 , wherein the other transmission metric is the other of the blank level and the black level.

8. An Automatic Video Detector (“AVD”) comprising:

a video detector array module generating two or more transmission metrics of a received video signal for a predetermined amount of time; and

a state machine in signal communication with the video detector away module and detecting a transmission format of the received video signal based on the generated metrics;

wherein the video detector array module includes a video line detector and a sub-carrier frequency detection module, wherein the video detector array module further includes a sub-carrier alternating phase detector, and wherein the video detector array module further includes one of a black detector, a user programmable NTSC selector, or a user programmable PAL selector.