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Lip checker A unique product to track and eliminate broadcast signal time differences between audio and image signals or multiple audio signals.

A big problem solved

Not all signal paths were created equal. With complex location linkups, spanning thousands of kilometers, audio and video signals don't always follow the same route. Internet, microwave, broadband, telephone, satellite or undersea cable may be a factor. Typically, quality is not a problem, but synchronisation often is. The Kamesan Lip Checker has been developed to measure and quantify these delays, providing the engineer with precisely calculated offsets to calibrate signal delay equipment.

How it works

The Lip checker is a small battery powered unit which compares the arrival time, of a simultaneously generated audio and video burst, arriving from a remote location. At the receiving location, audio is easily captured via a microphone or direct line connection. Video bursts are detected directly from a monitor screen using an exclusive image probe which is manually pointed at the changing image. The calculated delay is displayed on the unit's large LCD to an accuracy of within one millisecond or resolved to a single video frame.
Video Kachinko

No special signal is required. For example, the system can typically extract information from any naturally occuring audio and video event such as a closeup of a presenter speaking (point probe at mouth) or someone clapping their hands on camera. However, for increased accuracy and ease of use the Video Kachinko unit is available. This utilises a high output LEDs for light pulsing timing while at the same time emitting a tone for audio signal timing. The camera is pointed at the reflector and the audio connected via na XLR. With such a distinct, controlled source, the various feeds from the location link can be synchronised within seconds.

Other Applications

Signals arrive in so many formats, HDTV, SECAM, PAL, NTSC as well as in MPEG or based on other computer based codecs. Because of processing and transmission variations the final result may look and sound good, but often, lipsync is lost. Kamesan's Lip Checker makes manual 'hunting' for the correct delay to apply a thing of the past.


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