Video signal recording and reproducing apparatus
First Claim
1. An apparatus for recording a video signal including a plurality of frames onto a hard disk apparatus and reproducing the video signal recorded onto the hard disk apparatus, comprising:
- receiving means for receiving a video signal;
compression means for compressing an amount of information per a unit of M frames of the received video signal so as to output a compressed video signal;
time compression means for compressing an amount of time per a unit of N*M frames of the compressed video signal along a time axis so as to obtain a compressed video writing signal;
writing means for writing the compressed video writing signal onto a plurality of different portions of the hard disk apparatus via a magnetic head, each of the plurality of different portions having successive L sectors, N*M frames of the compressed video writing signal being written onto the successive L sectors;
reading means for reading an arbitrary compressed video writing signal, which was previously written onto the plurality of different portions of the hard disk apparatus, from the hard disk apparatus via the magnetic head to obtain a compressed video reading signal;
time decompression means for decompressing an amount of time per a unit of N*M frames of the compressed video reading signal along the time axis so as to obtain a decompressed video signal for reproduction;
decoding means for decompressing an amount of information per a unit of M frames of the decompressed video signal for reproduction; and
control means for controlling the writing means and the reading means such that a period during which the compressed video writing signal is written onto the hard disk apparatus does not overlap with a period during which the compressed video reading signal is read from the hard disk apparatus, where L, M and N each is an integer greater than or equal to 1, wherein a period for the compressed video signal which is output from the compression means is set to be longer than time T. where the time T is defined as a sum of seek time required for moving the magnetic head to write the compressed video writing signal onto the hard disk apparatus, time required for writing the compressed video writing signal onto the hard disk apparatus, seek time required for moving the magnetic head to read the compressed video reading signal from the hard disk apparatus, and time required for reading the compressed video reading signal from the hard disk apparatus.
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Accused Products
Abstract
The video signal recording and reproducing apparatus of the invention includes: a receiving section for receiving a television signal; an image compression section for compressing an amount of information per unit time of the received continuous video signal; a writing section for intermittently writing a compressed video signal, obtained as an output of the image compression section, onto a hard disk apparatus via a magnetic head; a reading section for intermittently reading out the written compressed video signal from the hard disk apparatus via the magnetic head; a decoding section for restoring the read compressed video signal into an original video signal; a display section for displaying the restored video signal; and a control section for controlling the writing section and the reading section such that writing the video signal onto the hard disk apparatus and reading an arbitrary video signal, which was previously written onto the hard disk apparatus, from the hard disk apparatus are performed apparently simultaneously and continuously.
173 Citations
26 Claims
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1. An apparatus for recording a video signal including a plurality of frames onto a hard disk apparatus and reproducing the video signal recorded onto the hard disk apparatus, comprising:
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receiving means for receiving a video signal;
compression means for compressing an amount of information per a unit of M frames of the received video signal so as to output a compressed video signal;
time compression means for compressing an amount of time per a unit of N*M frames of the compressed video signal along a time axis so as to obtain a compressed video writing signal;
writing means for writing the compressed video writing signal onto a plurality of different portions of the hard disk apparatus via a magnetic head, each of the plurality of different portions having successive L sectors, N*M frames of the compressed video writing signal being written onto the successive L sectors;
reading means for reading an arbitrary compressed video writing signal, which was previously written onto the plurality of different portions of the hard disk apparatus, from the hard disk apparatus via the magnetic head to obtain a compressed video reading signal;
time decompression means for decompressing an amount of time per a unit of N*M frames of the compressed video reading signal along the time axis so as to obtain a decompressed video signal for reproduction;
decoding means for decompressing an amount of information per a unit of M frames of the decompressed video signal for reproduction; and
control means for controlling the writing means and the reading means such that a period during which the compressed video writing signal is written onto the hard disk apparatus does not overlap with a period during which the compressed video reading signal is read from the hard disk apparatus, where L, M and N each is an integer greater than or equal to 1, wherein a period for the compressed video signal which is output from the compression means is set to be longer than time T. where the time T is defined as a sum of seek time required for moving the magnetic head to write the compressed video writing signal onto the hard disk apparatus, time required for writing the compressed video writing signal onto the hard disk apparatus, seek time required for moving the magnetic head to read the compressed video reading signal from the hard disk apparatus, and time required for reading the compressed video reading signal from the hard disk apparatus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification