Eeco Incorporated

Robert E Yablonski

John A Roe

A method and apparatus for suppressing spurious audio frequency sounds in a system in which electrically represented audio frequency sounds are very significantly raised in frequency and are conformed to a video line signal format. A sufficient number of guard samples ('M') are included at the beginning of each line of electrically represented audio frequency sounds to allow the amplitude response of the video line signal to reach the specified value prior to the occurrence of the samples that are used. The additional guard samples are provided by RAM memory (3), which is controlled by state machine (4). Fewer additional guard samples ('K') may be provided at the end of a video line to enhance tolerance to small timing variations. This method and apparatus allows satisfactory functioning with apparatus having a limited range of frequency response and without precise timing adjustment of video information signals in relationship to the line of synchronizing signal, thus being less costly to manufacture and use.

Compressed audio silencing

A method and apparatus for optimally processing television compressed audio signals by adaptively controlling the gain of the apparatus. The average value of the digitized signal is compared to a reference value to produce a gain control signal. A variable input video signal amplitude is automatically accommodated to a fixed analog to digital converter range.

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Irvine, CA, United States of America

Robert E Yablonski