Patent ID: 7683930
Filing Date: 2010-03-23
Classification: H04N

Abstract:
1. A method comprising: accessing a persistent storage medium from a computing device, the persistent storage medium storing a portable vertical blanking interval signal stream derived from at least a portion of a television signal, the portable vertical blanking interval signal stream including vertical blanking interval signal header and a digitized vertical blanking interval signal payload, the digitized vertical blanking interval signal payload including a plurality of waveforms; reading the vertical blanking interval signal header from the persistent storage medium; validating the vertical blanking interval signal header relative to a vertical blanking interval signal standard; allocating memory based on size of the stored portable digitized vertical blanking interval signal stream defined by the vertical blanking interval signal header; reading the digitized vertical blanking interval signal payload from the persistent storage medium into the allocated memory according to information read from the vertical blanking interval signal header; computing at least one threshold level for the digitized vertical blanking interval signal payload; determining at least one threshold point for each waveform of the digitized vertical blanking interval signal payload relative to the at least one threshold level; detecting at least one deviation of the digitized vertical blanking interval signal payload from the vertical blanking interval signal standard by: presenting diagnostics indicating signal aberrations in the payload when the length of the payload is greater than the maximum length for the payload; calculating local thresholds for segments of the digitized vertical blanking interval signal payload; and correcting the signal aberrations of the vertical blanking interval signal payload based on the local thresholds for each segment.