Buffer memory dispersion type video/audio transmission system with spatially and timewise divided inter-office junction lines
First Claim
1. A buffer memory dispersion type video/audio transmission system with spatially and timewise divided interoffice junction lines comprising:
- a center comprising;
a group of audio files for storing audio information;
a group of video files for storing video information;
means for fetching specific information from said audio and video file groups in response to an information request received at said center from a subscriber terminal unit and for dividing fetched video information into a luminance signal and a chrominance signal; and
means for transmitting said luminance signal with a superimposing signal in a time-divisional fashion by a first junction line and for transmitting said chrominance signal with an audio signal based on fetched audio information in a time-divisional fashion by a second junction line; and
a plurality of subcenters comprising;
a multiplex receiver for receiving said transmitted signals from said first and second junction lines;
video and audio buffer memories for temporarily storing video and audio information received by said multiplex receiver from said first and second junction lines; and
an audio output unit and a video output unit and an audio changeover unit and a video changeover unit for coupling said temporarily stored video and audio information to said subscriber terminal units.
1 Assignment
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Accused Products
Abstract
A video/audio transmission system for sending video and audio information from the video and audio files of a center to a subscriber through a subscriber'"'"'s junction line is disclosed in which at least one subcenter is disposed near to the subscriber to reduce the number of repeaters arranged on the subscriber'"'"'s junction line. The subcenters can include a video/audio buffer memory, and exchange and other related circuits. The transmission lines for sending the video and audio information from the center to the sub-center are spatially divided into a plurality of groups in accordance with the sort of the video and audio information being sent, and further the information is time-divisionally transmitted at each group.
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Citations
14 Claims
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1. A buffer memory dispersion type video/audio transmission system with spatially and timewise divided interoffice junction lines comprising:
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a center comprising; a group of audio files for storing audio information; a group of video files for storing video information; means for fetching specific information from said audio and video file groups in response to an information request received at said center from a subscriber terminal unit and for dividing fetched video information into a luminance signal and a chrominance signal; and means for transmitting said luminance signal with a superimposing signal in a time-divisional fashion by a first junction line and for transmitting said chrominance signal with an audio signal based on fetched audio information in a time-divisional fashion by a second junction line; and a plurality of subcenters comprising; a multiplex receiver for receiving said transmitted signals from said first and second junction lines; video and audio buffer memories for temporarily storing video and audio information received by said multiplex receiver from said first and second junction lines; and an audio output unit and a video output unit and an audio changeover unit and a video changeover unit for coupling said temporarily stored video and audio information to said subscriber terminal units. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A buffer memory dispersion type video/audio transmission system with spatially and timewise divided interoffice junction lines comprising:
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a center comprising; a group of audio files for storing audio information; a group of video files for storing video information; means for fetching specific information from said audio and video file groups in response to an information request received at said center from a subscriber terminal unit and for dividing fetched video information into a luminance signal and a chrominance signal; and means for transmitting said luminance signal with an audio signal based on said fetched audio information in a time-divisional fashion by a first junction line and for transmitting said chrominance signal with a superimposing signal in a time-divisional fashion by a second junction line; and a plurality of subcenters comprising; a multiplex receiver for receiving said transmitted signals from said first and second junction lines; video and audio buffer memories for temporarily storing video and audio information received by said multiplex receiver from said first and second junction lines; and an audio output unit and a video output unit and an audio changeover unit and a video changeover unit for coupling said temporarily stored video and audio information to said subscriber terminal units. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification