Apparatus and method for detecting edition point of audio/video data stream

An information searching apparatus comprising:

• extraction means for extracting a parameter associated with coding from data which are obtained by coding predetermined information every predetermined unit;
• comparison means for comparing the parameter of a prescribed unit with the parameter of another unit;
• and
• detection means for detecting an edition point of information in accordance with a comparison result of said comparing means;
• wherein the information is an MPEG video signal, and the parameter is intra_dc_precision or intra_vlc_format.

An information searching method comprising the steps of:

• extracting a parameter associated with coding from data which are obtained by coding predetermined information every predetermined unit;
• comparing a parameter of a predetermined unit with a parameter of another unit;
• and
• detecting an edition point of information in accordance with a comparison result of said comparing step;
• wherein the information is a compressed audio signal, and the parameter is a scale factor or word length.

An information searching method comprising the steps of:

• extracting a parameter associated with coding from data which are obtained by coding predetermined information every predetermined unit;
• comparing a parameter of a predetermined unit with a parameter of another unit;
• and
• detecting an edition point of information in accordance with a comparison result of said comparing step;
• wherein the information is an MPEG video signal, and the parameter is intra_dc_precision or intra_vlc_format.

An information searching method comprising the steps of:

• extracting a parameter associated with coding from data which are obtained by coding predetermined information every predetermined unit;
• comparing a parameter of a predetermined unit with a parameter of another unit;
• and
• detecting an edition point of information in accordance with a comparison result of said comparing step;
• wherein the information contains a video signal and an audio signal, and wherein said comparing step compares the parameter of the video signal of the prescribed unit with the parameter of the video signal of said another unit and also compares the parameter of the audio signal of the prescribed unit with the parameter of the audio signal of said another unit, and said detection step detects the edition point on the basis of both the comparison result of the parameter of the video signal and the comparison result of the parameter of the audio signal.

A transmission medium for transmitting a program comprising:

• extracting a parameter associated with coding from data which are obtained by coding predetermined information every predetermined unit;
• comparing a parameter of a predetermined unit with a parameter of another unit;
• and
• detecting an edition point of information in accordance with a comparison result of said comparing step;
• wherein said parameter is selected from the group consisting of a scale factor or word length of a compressed audio signal, and intra_dc_precision or intra_vlc_format of an MPEG compressed video signal.

Apparatus for detecting an edition point in an audio/video data stream, comprising:

• extraction means for extracting a number of parameters associated with coding from data which are obtained by coding predetermined information every predetermined unit;
• comparison means for comparing the number of parameters of a prescribed unit with the number of parameters of at least one other unit and determining if the number has changed;
• and
• detection means for detecting an edition point in said data stream in accordance with the determination by said comparing means.

Method for detecting an edition point in an audio/video data stream, comprising the steps of:

• extracting a number of parameters associated with coding from data which are obtained by coding predetermined information every predetermined unit;
• comparing the number of parameters of a prescribed unit with the number of parameters of at least one other unit and determining if the number has changed;
• and
• detecting an edition point in said data stream in accordance with the determination in said comparing step.