Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Patent
1994-07-20
1997-04-29
Tran, Thai Q.
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
3589091, 386107, 386117, H04N 591, H04N 576, H04N 5226, H04N 578
Patent
active
056254636
ABSTRACT:
A video recorder automatically adds desired audio signals to the video signals being recorded without intervention of the operator. A sensor detects when voice signals are not being sensed by the microphone in the video recorder and automatically inserts a preselected audio signal. The operator can select from several audio signals as the default audio signal to be added when no voice signals are being recorded. A switch switches off the microphone output to the video tape recorder when no voice, is being detected to prevent unwanted noise from being added to the tape. The volume level of the background music when voice is detected is adjusted so that when no voice is being detected the volume of the preselected audio signal is at one level, and when voice is detected, the volume of the preselected audio signal is at another level, e.g., significantly reduced. This permits the listener to follow the track of the audio signal without disturbing jumps in the background music. Alternatively, the signal level being applied to the tape can be continuously adjusted to vary the volume of the added audio signal as a function of the detected voice signals. This ensures that when the tape is played back no large jumps in volume occur due to radical changes in the detected voice levels, i.e., the volume remains relatively constant despite large variations in voice signal levels.
REFERENCES:
patent: 3518375 (1970-06-01), Hawkins
patent: 4807051 (1989-02-01), Ogura
patent: 4809079 (1989-02-01), Blazek et al.
patent: 4864627 (1989-09-01), Dugan
patent: 5124814 (1992-06-01), Takahashi et al.
patent: 5260784 (1993-11-01), Kamiyama et al.
Din Luanne D.
Tran Thai Q.
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