Data Transmission apparatus of video-on-demand or near video-on-demand system
First Claim
1. A data transmission apparatus comprising:
- a data recording means for recording desired data on a recording medium in blocks;
a data recording control means for controlling said data recording means to record a plurality of divided time series data, formed by dividing the time series data for every predetermined time zone and applying variable length coding, so that the divided time series data of continuous time zones are recorded in a same block or continuous blocks of the recording medium in the order of the time zones;
a table storing means for storing at least a table including data length information indicating the data length of each of the divided time series data and recording address information indicating a first recording address of the divided time series data in the data recording means; and
an output means for sequentially reproducing said divided time series data and outputting said divided time series data in a predetermined fixed time unit based on the data length information and the recording address information stored in the table storing means.
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Abstract
A data transmission apparatus suitable for use in a VOD system which can send program data in response to requests made at any time. In the data transmission apparatus of the present invention, a series of data is read from a mass storage at a high speed referring to a data recording table in which are recorded the head address and magnitude of the series of data which are to be simultaneously read and the magnitudes of the individual data. For the read data, the magnitudes of individual data of the table are referred to, separated to individual data, and recorded in the buffer memory (33-1 to 33-n) for every output channel. The data is appropriately processed and transmitted for every channel by the buffer memory controllers (32-1 to 32-n) provided for every output channel and output controllers (35-1 to 35-n) and formatter. By this, it is possible to provide a data transmission apparatus in which desired data can be transmitted from the recording apparatus in which individual data are recorded with a variable data rate in parallel at a high speed, a variety of programs can be recorded with a good efficiency, and no deterioration occurs in the picture.
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Citations
11 Claims
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1. A data transmission apparatus comprising:
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a data recording means for recording desired data on a recording medium in blocks; a data recording control means for controlling said data recording means to record a plurality of divided time series data, formed by dividing the time series data for every predetermined time zone and applying variable length coding, so that the divided time series data of continuous time zones are recorded in a same block or continuous blocks of the recording medium in the order of the time zones; a table storing means for storing at least a table including data length information indicating the data length of each of the divided time series data and recording address information indicating a first recording address of the divided time series data in the data recording means; and an output means for sequentially reproducing said divided time series data and outputting said divided time series data in a predetermined fixed time unit based on the data length information and the recording address information stored in the table storing means. - View Dependent Claims (2, 3)
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4. A data transmission apparatus comprising:
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a data recording means for recording on a recording medium a plurality of divided time series data, formed by dividing a plurality of time series data for every predetermined time zone and applying variable length coding, in order in accordance with the time zones of the plurality of divided time series data of each time series data, respectively; a table storing means for storing at least a table including data length information indicating the data length of each of the divided time series data and recording address information indicating the first recording address of at least one divided time series data in the data recording means; a plurality of output channels; and an output means for sequentially outputting the divided time series data from one of the plurality of output channels in a predetermined fixed time unit based on the data length information and the recording address information stored in the table storing means. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11)
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Specification