Synchronizing audio with delayed video
OwnerWilhelmus Fekkes, Michel Nieuwenhuizen +1inventors
InventorsWilhelmus Fekkes, Michel Nieuwenhuizen, Johan Spanjers
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Abstract
Video processing delays are compensated for to maintain synchronism of audio with the video. The delay is determined by correlating a signal derived from a displayed light image with a pre-processed video test signal from which the image was produced.
Claims19
Apparatus for compensating for loss of synchronization between video and audio presented to a viewer due to a processing delay of the video, said apparatus comprising:
- a. a signal 12 generator for transmitting a test signal representing a test image to presented by a display device after said test signal is subjected to said processing delay;
- b. a light detector 16 for receiving light from the test image and producing a received test signal representative of the test image;
- c. a controller 14 for:
- i) correlating the received test signal with the transmitted test signal, ii) determining the delay between said signals, and iii) effecting a compensating delay of the audio.
A video source VS for providing a video output and an audio output and comprising:
- a. a test generator 12 for effecting production of a test image by a display device;
- b. an ambient light detector 16 for receiving and detecting ambient light including light from the test image;
- c. an audio delay device 18 for effecting a controllable delay in the audio output;
- d. a controller 14 for:
- i) receiving an output of the test generator 12 that represents the test image to be produced, ii) receiving an output of the ambient light detector 16 that represents the detected test image, iii) producing an audio delay signal representing a video delay between the output from the test generator 12 and the output from the ambient light detector, and iv) controlling the audio delay device 18 to delay the audio output so as to compensate for said video delay.
A synchronization system comprising:
- a. a video source for providing a video output and an audio output;
- b. a test image generator 12 for producing as the video output a test signal representative of a test image for display by a display device;
- c. a light detector 16 for detecting light from the test image and producing a signal indicating detection of the test image;
- d. an audio delay device 18 for controllably delaying the audio output;
- e. a controller 14 for:
- i) receiving the test signal and the signal from the light detector 16, ii) determining a delay in production of the test image by the display, and iii) effecting a compensating delay in the audio output.
A method of compensating for loss of synchronization between video and audio presented to a viewer due to a processing delay of the video, said method comprising:
- a. transmitting a test signal representing a test image to be presented by a display device after said test signal is subjected to said processing delay;
- b. detecting light from the test image and producing a received test signal representative of the test image;
- c. determining the delay between said signals and effecting a compensating delay of the audio.
Dependencies are inferred from the claim text.