Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1998-08-27
2001-10-16
Garber, Wendy R. (Department: 2615)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000
Reexamination Certificate
active
06304717
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus, method, etc. for recording a transmission format signal into a recording medium.
2. Description of Related Art
The MPEG (Moving Picture Experts Group) prescribes a transport stream consisting of compressed audio and video signals. The transport stream is composed of more than one transport packet. There is no data between the transport packets in the transport stream.
The transport packet has at the top thereof a sync_byte of 1 byte to discriminate the transport packet, and has a transport_error_indicator, payload_unit_start_indicator, transport_priority, PID (packet_Identification), transport_scrambling_control, and an adaptation_field_control.
The value of the sync_byte is “01000111 (0×47 in hexadecimal notation)”. The transport packet has always a length of 188 bytes. A data byte has recorded therein compressed video and audio signals.
A conventional reproducing apparatus capable of reproducing data recorded in such a recording medium will be described with reference to FIG.
1
.
In
FIG. 1
, the reproducing apparatus is generally indicated with a reference
30
.
The reproducing apparatus
30
comprises a pickup
31
to read a transport stream recorded in an optical disc
40
, an RF amplifier/demodulator circuit
32
to amplify and demodulate the transport stream read out of the optical disc
40
, an ECC decoder
33
for error correction, a demultiplexer
34
, a video decoder
35
to decode a compressed signal, and an audio decoder
36
to decode a compressed audio signal.
The above-mentioned RF amplifier/demodulator
32
is provided to amplify the received transport stream from the pickup
31
, demodulate the amplified signal and supplies the demodulated signal to the ECC decoder
33
in which the received transport stream is subjected to an error correction based on an error correction code. The output of the ECC decoder
33
is supplied to the demultiplexer
34
.
The demultiplexer
34
detects a PID of a transport packet supplied from the ECC decoder
33
to judge, according to a preset table, whether the PID is for video or audio. The demultiplexer
34
supplies the video decoder
35
with a data byte part of the transport packet having a video PID while supplying the audio decoder
36
with a data byte part of the transport packet having an audio PID. It should be noted that when the demultiplexer
34
detects a PID not included in the preset table, it will ignore the transport packet having such a PID.
Further the demultiplexer
34
is reset with a signal indicative of the top of a sector generated by the ECC decoder
33
, processes
10
transport packets from the sector top, then skips remaining 168 bytes of one sector and repeats the detection of a PID of a transport packet supplied from the ECC decoder
33
.
The above-mentioned video decoder
35
decodes a video transport packet supplied from the demultiplexer
34
to provide a video signal. Similarly, the audio decoder
36
decodes an audio transport packet from the demultiplexer
34
to provide an audio signal.
A recording medium such as CD-ROM, magneto-optic disc or the like has recorded therein data in each sector of a power of 2 of bytes such as 2048 bytes or 512 bytes in size suitable for an external recording medium for use with a computer, etc. The 2048 or 512 bytes are suitable for storage of data in such an external storage unit for a computer, etc. When a transport stream is recorded in such a recording medium, the size of transport packet of 188 bytes will be a problem.
For example, it is assumed here that a transport stream is recorded in a CD-ROM having a capacity of 2048 bytes per sector. In this case, since each of transport packets composing the transport stream is of 188 bytes in size, a redundant part takes place in one sector. More particularly, 10 transport packets each of 188 bytes can be recorded in each sector of 2048 bytes, but the sector will have a redundancy of 168 bytes. Namely, since the 188 byte is an aliquant part of the 2048 bytes, the sector will have a redundant part having no data. In the above example, the redundancy is as large as about 8%.
Since such a recording medium has a rather large redundancy of about 8% per sector, a transport stream cannot efficiently be recorded in the recording medium.
Also, even if a transport stream is recorded in the recording medium with no consideration given to the sector and transport packet sizes, the transport stream thus recorded cannot be reproduced for the transport stream is read and reproduced with respect to each sector.
SUMMARY OF THE INVENTION
Accordingly, the present invention has an object to overcome the above-mentioned drawbacks of the prior art by providing a recording apparatus and method for recording a transmission format signal with no occurrence of any redundant part, a recording medium capable of recording a large volume of transmission format signals, and a reproducing apparatus and method for reproducing the transmission format signals recorded in the recording medium.
The above object can be accomplished by providing an apparatus for recording into a recording medium designed to record data in each recording unit hereof a transmission format signal composed of a plurality of packets smaller in size than each recording unit of the recording medium, comprising, according to the present invention, a recording means for recording the transmission format signal in such a manner that no void will exist in each recording unit of the recording medium.
The above object can also be accomplished by providing a method of recording into a recording medium designed to record data in each recording unit thereof a transmission format signal composed of a plurality of packets smaller in size than each recording unit of the recording medium, comprising, according to the present invention, a step of recording the transmission format signal in such a manner that no void will exist in each recording unit of the recording medium.
The above object can also be accomplished by providing an apparatus for reproducing a transmission format signal composed of a plurality of packets smaller in size than each recording unit of the recording medium and recorded in a recording medium
designed to record data in each recording unit thereof in such a manner that no void will exist in each recording unit of the recording medium, comprising, according to the present invention, a reproducing means for reproducing the transmission format signal from the recording medium, an extracting means for extracting the plurality of packets from the read transmission format signal, and a decoding means for decoding the transmission format signal packet by packet based on the extracted packets.
The above object can also be accomplished by providing a method of reproducing a transmission format signal composed of a plurality of packets smaller in size than each recording unit of the recording medium and recorded in a recording medium
designed to record data in each recording unit thereof in such a manner that no void will exist in each recording unit of the recording medium, comprising, according to the present invention, the steps of reproducing the transmission format signal from the recording medium, extracting the plurality of packets from the read transmission format signal, and decoding the transmission format signal packet by packet based on the extracted packets.
The above object can also be accomplished by providing a recording medium designed to record data in each recording unit thereof, having recorded therein a transmission format signal composed of a plurality of packets smaller in size than each recording unit of the recording medium, in such a manner that no void will exist in each of the recording units thereof.
REFERENCES:
patent: 5557419 (1996-09-01), Muto
patent: 5596581 (1997-01-01), Saeijs et al.
patent: 5878187 (1999-03-01), Kubota et al.
patent: 5983387 (1999-11-01), Nagai et al.
patent: 6115537 (2000-09-01), Yamada et al.
patent: 195 22 32
Frommer William S.
Frommer & Lawrence & Haug LLP
Garber Wendy R.
Onuaku Christopher
Sony Corporation
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