Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1998-08-31
2001-02-06
Nguyen, Huy (Department: 2715)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000
Reexamination Certificate
active
06185364
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an image and sound reproducing device, and more particularly to an image and sound reproducing device for decoding and reproducing encoded data in which digitally compressed and encoded image data, auxiliary image data such as superimposed characters or the like which is digitally compressed and encoded in the same manner separately from the image data, and sound data which is digitally compressed and encoded in the same manner is multiplexed respectively.
2. Prior Art
Conventionally, there is known an image and sound reproducing device for displaying a main image and an auxiliary image in a superposition manner by subjecting to a decoding processing separately encoded data in which digitally compressed and encoded auxiliary image data such as superimposed characters for films and words for karaoke are multiplexed in addition to normal image data and sound data digitally compressed and encoded (for example, Japanese Patent Application Laid-Open No. 6-314092).
FIG. 1
is a block view showing one example of the conventional image and sound reproducing device which has been described above. This conventional reproducing device reproduces multiplexed encoded data which is recorded on a recording medium
181
. On the recording medium
181
, auxiliary image data such as character data which is encoded in run-length encoding is multiplexed and recorded in advance in digitally compressed encoded normal image data and sound data.
The reproducing device reproduces encoded data which is recorded and multiplexed in this recording medium
181
and the data separating part
182
separates the data. Then, the auxiliary image data is supplied to an auxiliary image decoding part
183
, and the main image data is supplied to a main image decoding part
184
with the result that the main data and the auxiliary data is decoded and processed separately in the auxiliary and main image decoding parts
183
and
184
. The decoded auxiliary image data is overlapped with the decoded main image data at the image data superposition part
186
to be output as an image signal. Furthermore, the compressed encoded sound data which is separated at the data separating part
182
is supplied to a sound decoding part
185
and is decoded and processed to be output as a sound signal.
Furthermore, as a synchronization reproduction method of such digital compressed and encoded data, there is the MPEG (Moving Picture Experts Group) method which is an international standard for compressing moving pictures. In the encoded data in the MPEG method, image and sound data, as well as two kinds of time codes which is used for synchronizing and reproducing the sound and image data is multiplexed. One of the time codes is a SCR (System Clock Reference) which is a reference time code for generating a reference clock at the reproducing device while the other time code is s PTS (Presentation Time Stamp) displaying the image data and the sound data and indicating output time.
FIG. 2
is a block view showing one example of the conventional reproducing device on the basis of the MPEG method. The data separating part
192
separates a time code for synchronization control together with the image data and sound data which is reproduced from the recording medium
191
. The SCR which is a time code for generating the reference clock is sent to the reference clock generating part
193
and is used for initialization or correction of the reference clock.
Furthermore, the data separating part
192
sends the PTS
1
showing the display time of the auxiliary image to the auxiliary image decoding part
194
, and the PTS
2
showing the display time of the main image to the main image processing part
195
, and the PTS
3
showing the output time of the sound to the sound decoding part
196
respectively. After the main image decoding part
195
decodes and processes encoded data of the main image which is input through the data separating part
192
, the main image decoding part
195
compares the PTS
2
with the reference clock from the reference clock generating part
193
so that the decoded main image data is output to the image data superposition part
197
at the time when the reference clock agrees with the PTS
2
.
Furthermore, after the auxiliary image decoding part
194
decodes and processes the encoded data of the auxiliary image which is input through the data separating part
192
, the auxiliary image decoding part
194
compares the PTS
1
with the reference clock from the reference clock generating part
193
so that the decoded auxiliary image data is supplied to the image data superposition part
197
at the time when the reference clock agrees with the PTS
1
to be overlapped with the decoded main image data. Furthermore, after the sound decoding part
196
decodes and processes the sound encoded data which is input through the data separating part
192
, the sound decoding part
196
compares the PTS
3
with the reference clock from the reference clock generating part
193
to be output at the time when the reference clock agrees with the PTS
3
.
However, with the conventional reproducing device, in the case where the reproducing device is realized by means of software, the data processing capability of the reproducing device is lowered with the result that the decoding processing of the auxiliary image data such as superimposed characters and words for karaoke and superposition processing of the auxiliary image data to the main image cannot be carried out in real time in some cases. In such cases, the superposition processing of the auxiliary image is appropriately thinned out (data pieces are thinned out) so that the synchronization correction is required to be carried out.
However, in the conventional reproducing device such as recording and reproducing device for characters and images shown in
FIG. 1
, the synchronization correction is not carried out in the case where the data processing capability of the reproducing device is lowered and the image cannot be processed in real time.
Furthermore, in the conventional reproducing device shown in
FIG. 19
in accordance with the aforementioned MPEG method, the resolution of the SCR which is reference time code for generating the reference clock with the reproducing device is either 90kHz or 27MHz with the result that there is a problem with the precision of the reference clock which is generated in the case where the reproducing device is realized by means of software.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an image and sound reproducing device which can reproduce an image and sound in a synchronous manner in the case where decoding processing of an auxiliary image data such as superimposed characters and words for karaoke and superposition processing of the auxiliary image to the main image cannot be carried out in real time.
Another object of the present invention is to provide an image and sound reproducing device which can reproduce in a synchronous manner auxiliary image data and sound data such as superimposed characters and words for karaoke by generating a reference clock without using an SCR which is a reference code for generating a reference clock which is multiplexed with the encoded data in the case where a reproducing device is constituted in accordance with the MPEG method.
The image and sound reproducing device according to the present invention decodes and reproduces multiplexed data in which auxiliary image data which is digitally compressed and encoded in the same manner such as superimposed characters for films and words for karaoke is multiplexed in addition to digitally compressed and encoded image and sound data.
The image and sound reproducing device according to the present invention comprises:
a data separating part for separating and processing main image data, auxiliary image data and sound data from multiplexed data;
a sound decoding part for decoding and processing main image data which is separated at the data sep
NEC Corporation
Nguyen Huy
Ostrolenk Faber Gerb & Soffen, LLP
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