Television – Format – Including additional information
Patent
1996-12-12
1999-06-08
Kostak, Victor R.
Television
Format
Including additional information
348479, H04N 708
Patent
active
059108223
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an apparatus and a method for multiplexing serial data into horizontal blanking portions of video data to be transmitted, involving little data delay and doing away with complicated control procedures. More particularly, the invention relates to a video camera system incorporating the same apparatus and method.
BACKGROUND ART
When any communication command furnished in serial data is to be multiplexed into horizontal blanking portions of video data (e.g., 8-bit parallel data), the serial communication command is first converted conventionally to parallel data reaching the CPU (central processing unit) or the like. It is in the form of parallel data that the communication command is multiplexed into the horizontal blanking period of video data.
If the transmission rate of serial communication command data is lower than the horizontal blanking rate (about 15 kHz), the conventional method above necessarily entails a delay equivalent to the serial-parallel conversion time for multiplexing.
For example, consider 11-bit serial communication command data composed of a start bit (1 bit), data (8 bits), a parity bit (1 bit) and a stop bit (1 bit). In such a case, to perform the conventional serial-parallel conversion requires waiting for the entire 11-bit data to be received. If the rate of serial communication command data is 9,600 bps, the delay amounts to approximately 17 horizontal periods. Where the data is to be multiplexed into horizontal blanking portions in each of the 17 horizontal periods, complicated control procedures are needed illustratively to determine which blanking portion is to have the data multiplexed therein and which portion is not to.
It is therefore an object of the present invention to provide an apparatus and a method for multiplexing serial data involving little data delay and without complicated control procedures for multiplexing.
DISCLOSURE OF THE INVENTION
In carrying out the invention and according to a first aspect thereof, there is provided a data transmission apparatus comprising: first data inputting means for inputting serial data transmitted at a first rate; second data inputting means for inputting video data; data sampling means for generating resampled data by sampling the serial data input via the first data inputting means, the sampling being performed by use of a clock signal at a second rate higher than the first rate; data extracting means for extracting a predetermined number of resampled data from the resampled data output by the data sampling means in each of the horizontal periods of the video data; data multiplexing means for generating multiplexed data by multiplexing into horizontal blanking portions of the video data the predetermined number of resampled data extracted by the data extracting means; and data outputting means for outputting the multiplexed data generated by the data multiplexing means.
According to a second aspect of the invention, there is provided a data reception apparatus comprising: data inputting means for inputting multiplexed data acquired by multiplexing control data into horizontal blanking portions of video data; data separating means for separating the video data and the control data from the multiplexed data; data defining means for defining definite data from the control data separated by the data separating means; first data outputting means for outputting the definite data defined by the data defining means; and second data outputting means for outputting the video data separated by the data separating means.
According to a third aspect of the invention, there is provided a data transmission apparatus comprising: first data inputting means for inputting serial data transmitted at a first rate; second data inputting means for inputting video data; data sampling means for generating resampled data by sampling the serial data input via the first data inputting means, the sampling being performed by use of a clock signal at a second rate higher than the first rate; data extracti
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Kihara Taku
Yamaguchi Akira
Frommer William S.
Kostak Victor R.
Sony Corporation
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