Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1998-03-02
2001-02-06
Nguyen, Huy (Department: 2712)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000
Reexamination Certificate
active
06185366
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for recording and reproducing coded signals of a motion picture (video signal) and a sound (audio signal), and an apparatus for recording and reproducing the coded signals transmitted from a transmission system to and from a recording medium, and particularly, relates to a recording and reproducing apparatus capable of performing a decoded reproduction in real-time processing while the coded signal transmitted from the transmission system is recorded in the recording medium.
2. Description of the Related Art
Presently, as to an apparatus for recording and reproducing a coded signal transmitted from a transmission system, there is proposed a method for reproducing in real time the coded signal which has been transmitted for a time shorter than an actual reproduction time of a program, for instance, a 2-hour reproduction time and is recorded in a recording medium by making use of a transmission system capable of transmitting the coded signal at a transmission rate higher than a coding rate.
In the method in the prior art mentioned above, the transmission time of the data depends on an actual reproduction time and the transmission rate of the program.
Exemplarily, when a 2-hour program having the transmission rate of 4 Mbps is intended to be transmitted for 10 minutes, it requires a transmission band of 48 Mbps which is 12 times as large as that of 4 Mbps.
FIG. 1
is a chart showing a time relation between the transmission time of data of a program and a reproduction time of the data thereof in the prior art.
As seen from
FIG. 1
, after the start of the data transmission (TMS) of a program, it takes 10 minutes to transmit all the data of a program. It should be noted that the data trasmitted are instantly recorded in the recording medium. Thus, there is needed a waiting time of 10 minutes before the reproduction of the program.
In order to obtain an enough performance, it requires a rather large transmission band width. On the contrary, when the transmission band width are limited, it requires a long transmission time. This poses problems of the long waiting time and degradation of image and sound quality due to the suppression of the transmission rate.
SUMMARY OF THE INVENTION
Accordingly, a general object of the present invention is to provide a coded signal transmission recording and reproducing apparatus, in which the above disadvantages have been eliminated.
A specific object of the present invention is to provide a method for recording and reproducing a coded signal on/from a recording medium of a recording and reproducing apparatus, the coded signal being coded at a predetermined coding rate and transmitted to the apparatus for a time shorter than an actual reproduction time at a transmission rate higher than the coding rate, the method comprising the steps of: transmitting the coded signal for a time shorter than an actual reproduction time at a transmission rate higher than the coding rate; recording the coded signal transmitted on the recording medium at a first transmission rate substantially equal to the transmission rate; reproducing the coded signal recorded in the recording medium at the first transmission rate so as to store the coded signal in a buffer memory; and decoding the coded signal from the buffer memory at the coding rate to reproduce in real time by interrupting the reproduction of the coded signal responsive to a coded signal share in the buffer memory.
Another and more specific object of the present invention is to provide an apparatus for recording and reproducing a coded signal on/from a recording medium, the coded signal being coded at a predetermined coding rate and transmitted for a time shorter than an actual reproducing time at a transmission rate higher than the coding rate, the apparatus comprising: recording means for recording the coded signal transmitted on the recording medium at a first transmission rate substantially equal to the transmission rate; reproducing means for reproducing the coded signal recorded on the recording medium at the first transmission rate; buffer memory for storing the coded signal reproduced by the reproducing means; reproducing control means for interrupting a reproducing operation of the reproducing means when the buffer memory is filed with a certain amount of the coded signal; and decoding means for decoding the coded signal from the buffer memory at the coding rate to reproduce in real time by using the reproducing control means.
Another and more specific object of the present invention is to provide an apparatus for recording and reproducing a coded signal on/from a recording medium, the coded signal being coded at a predetermined coding rate and transmitted for a time shorter than an actual reproducing time at a transmission rate higher than the coding rate, the apparatus comprising: a first buffer memory for storing the coded signal at a first transmission rate substantially equal to the transmission rate; recording and reproducing means for recording the coded signal outputted from the first buffer memory on a recording medium at a second transmission rate higher than the first transmission rate, and for reproducing the coded signal recorded on the recording medium at the second transmission rate; recording control means for issuing a recording instruction to the recording and reproducing means when the first buffer is filled with a certain amount of the coded signal reproduced by the recording and reproducing means; a second buffer memory for storing the coded signal reproduced by the recording and reproducing means at the second transmission rate; reproducing control means for interrupting a reproduction operation of the recording and reproducing means when the second buffer memory is filled with a certain amount of the coded signal; and decoding means for decoding the coded signal from the second buffer memory at the coding rate to reproduce in real time by using the reproducing control means.
Other objects and further features of the present invention will be apparent from the following detailed description.
REFERENCES:
patent: 5134499 (1992-07-01), Sata et al.
patent: 5432769 (1995-07-01), Honjo
patent: 5974223 (1999-10-01), Uchide
Anderson Kill & Olick P.C.
Nguyen Huy
Victor Company of Japan Ltd.
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