JPH11185317A - Digital data recording and reproducing method and device therefor, digital data recording method and device therefor and digital data reproducing method and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the commercial skiping function applicable to digital broadcasting. SOLUTION: All pieces of information sent from a broadcasting station are received by a receiving circuit 30 and recorded in a magnetic tape 35 by the tape drive 31 of a VTR device. A stream is read out of the magnetic tape 35 by the tape drive 31 at the time of reproduction, decoded by a decoder 33 and outputted to a monitor 36 as a reproduced signal. The reproduced data read out by the tape drive 31 are also supplied to a queue information detecting circuit 32. The queue information detecting circuit 32 checks the positions of the in-point and the out-point of a commercial part from the queue information of the stream of reproduced data, generates a read-out control signal and controls the tape drive 31 so as to skip the commercial part. Otherwise, the tape drive 31 is controlled so as to skip/record the commercial part of the received stream based on the detected queue information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital data recording / reproducing method and apparatus suitable for recording moving image signals, audio signals, and the like on a recording medium, reproducing and displaying or transmitting the signals. The present invention relates to a digital data recording method and apparatus, and a digital data reproducing method and apparatus.

[0002]

2. Description of the Related Art Conventional television broadcasting is based on terrestrial broadcasting which is configured to cover a wide area by a head office and a branch office.

FIG. 5 schematically shows the configuration of such a terrestrial broadcast.

[0004] The main station, which is the key, distributes the program material to each of the bureaus A, B, and C by private transmission at a high quality, and each bureau distributes the final program to the broadcast area assigned to it. Do. From such an operation form, in the terrestrial broadcast, it is relatively easy to give the broadcast content a regional characteristic.

[0005] Therefore, in the operation of terrestrial broadcasting, each branch office uses the above-mentioned regionality of broadcasting to advertise programs (so-called commercials) distributed from the head office.
The broadcast is performed by replacing the part with a commercial (local commercial) corresponding to the broadcast area in charge. This technique is called commercial insertion.

In order to realize such a commercial insertion, a splicing process for editing and combining a video stream and an audio stream is required.

FIG. 6 shows an example of stream convergence.

In this example, a branch station receiving a broadcast program from the main station transmits the so-called main broadcast on the nationwide network as it is, and replaces only the commercial portion with a local commercial having local regional characteristics to broadcast.

That is, the branch station transmits the main broadcast portion A of the broadcast program transmitted from the main station other than the commercial as it is, and replaces only the commercial portion B with a local commercial C prepared in advance for the reception area of the local station. And send it out. Then, after the end of the transmission of the local commercial C, the main broadcast program A 'transmitted from the main station is transmitted again.

[0010] By such a method, the branch station can realize a broadcast with regional characteristics at low cost.

[0011] By the way, when introducing the above-mentioned commercial insertion into digital broadcasting, it is necessary to perform a process of combining the data stream sent from the main station and the data stream sent from the branch station.

Next, a conventional multiplexing system using a transport stream in digital broadcasting will be described.

FIG. 7 shows a transformer in which a plurality of programs are multiplexed on the transmitting side and sent out via a transmission medium, and the receiving side can selectively receive any one of the plurality of programs. 1 shows a configuration example of a multiplexing system using a port stream.

In this example, the transmitting side is a base station (uplink station) for digital satellite broadcasting, the transmission medium is a satellite broadcasting line, and the receiving side is a so-called set-top box for receiving satellite broadcasting.

On the base station side, each program (channel)
Are multiplexed by the video encoder and the audio encoder of the multiplexers 61a to 61n. Here, each program is, for example, MPEG (ISO / IEC IS1).
1172 and IS13818).

The bit stream of each program in which the video bit stream and the audio bit stream are put together is further multiplexed by the transport multiplexer 62a of the multiplexer 62 and put into one transport stream. After that, the signal is modulated by the modulator 62b and sent to the transmission medium 63.

The transport stream transmitted to the viewer via the transmission medium 63 is demodulated by the demodulator 64a of the set-top box 64, demultiplexed by the demultiplexer 64b, and returned to a plurality of programs. Then, the program of the channel selected by the viewer with the remote controller 66 or the like is selectively taken out from the video decoder 64c.
And transmitted to the audio decoder 64d.

The signal is demodulated by the demodulator 64a of the set-top box 64,
The stream of the program demultiplexed by 4b is sent to the VTR device 67 and recorded.

The video and audio signals decoded by the video decoder 64c and the audio decoder 64d, respectively, and the stream recorded by the VTR 67 are output to a monitor 65.

As described above, in actual broadcasting such as digital satellite broadcasting, processing for editing and combining video data streams and audio data streams is required.

FIG. 8 shows how a video signal and an audio signal are multiplexed to form a transport stream.

FIG. 8 (a) shows the original signals of the input video signal and audio signal. For example, in Japan and the United States, a video signal is configured as a moving image signal of one frame every 33 msec according to the NTSC system, and in other regions, it is 40 msec according to the PAL system.
Is configured as a one-frame moving image signal. The frame is a processing unit T _v of the video signal.

Similarly, about 1000 samples (depending on the bit rate) of an audio signal, called an audio frame, are set as a basic unit of processing T _A.

The original signal is converted into a target bit stream of several Mbps as shown in FIG. 8B by video encoding and audio encoding. Each unit of the video stream (video access unit) has a variable length, and each unit of the audio stream (audio access unit) has a fixed length.

The coded video bit stream and audio bit stream are packetized, multiplexed and reconstructed into a transport stream as shown in FIG. 8C. This transport packet is a fixed-length packet of, for example, 188 bytes and can include a plurality of programs.

On the other hand, on the receiving side, the above-mentioned transport stream that has been compression-encoded and multiplexed is received, and is decoded by performing the above-described processing in the reverse order.

FIG. 9 shows how a video signal and an audio signal are reproduced from the transport stream.

That is, as shown in FIG. 9A, a transport stream composed of multiplexed transport packets composed of video packets and audio packets is demultiplexed by a demultiplexer, The video bit stream and the audio bit stream as shown in FIG. 9B are separated into elementary streams. Then, these bit streams are respectively decoded and output as a video signal and an audio signal as shown in FIG.

Next, the actual operation of the commercial insertion will be described.

FIG. 10 shows how cue information is used when performing a commercial insertion.

The commercial part CM of the main broadcast transmitted from the main station is transmitted to the local commercial CM 'at the branch station (local station).
Queue information 102 indicating the in (In) point and the out (Out) point of the commercial from the head office is replaced with PSI (Program Specific Information:
It is sent to the branch office as a special information packet as a program specification information (101).

On the branch station side, while transmitting the main broadcast portion A from the main station as it is, the P station corresponding to the queue information 102 is transmitted.
Upon receiving the SI packet 101, the PSI packet 1
The position of the in-point and out-point of the commercial part CM is specified from information such as pointers to the in-point and the out-point included in 01. Then, by referring to these pieces of information, only the portion between the specified in-point and out-point is replaced with the local commercial CM 'and transmitted. As a result, commercial insertion at the branch office is realized.

[0033]

At present, one of the functions realized in a VTR device for recording an analog video signal is a commercial skip function. This is because in the commercial part of television broadcasting, the audio track is often set to the stereo mode, and the main part other than the commercial is set to the mode such as double sound instead of stereo. Then, this is a function of skipping so that a commercial portion is not recorded on a recording medium such as a magnetic tape.

However, when digital television broadcasting is introduced, the above-described commercial skip function applied to the conventional analog television broadcasting, which is provided in a VTR device or the like, cannot be realized as it is.

The present invention has been made to solve such a problem, and has a digital data recording / reproducing method and apparatus, a digital data recording method and apparatus, having a commercial skip function applicable to digital broadcasting. It is an object of the present invention to provide a digital data reproducing method and apparatus.

[0036]

A digital data recording / reproducing method according to the present invention proposed to solve the above-mentioned problem records digital data of a broadcast program material including a commercial material, and stores the recorded digital data. A digital data recording / reproducing method for reproducing; a receiving step of receiving the digital data; a recording step of recording the received digital data on a recording medium; and inserting the digital data into the digital data recorded on the recording medium. A reproducing step of reproducing the digital data recorded on the recording medium by skipping the commercial material based on the position information indicating the position of the commercial material.

A digital data recording / reproducing apparatus according to the present invention proposed to solve the above-mentioned problem records digital data of a broadcast program material including a commercial material, and reproduces the recorded digital data. A recording and reproducing apparatus, receiving means for receiving the digital data, recording means for recording the received digital data on a recording medium, reproducing means for reproducing the digital data recorded on the recording medium, Detecting means for detecting position information indicating the position of the commercial material, and control means for controlling the recording means and the reproducing means to operate while skipping the commercial material indicated by the position information. It is characterized by having.

Further, a digital data recording method of the present invention proposed to solve the above-mentioned problem is a digital data recording method for recording digital data of broadcast program material including commercial material, wherein A detection step of detecting position information indicating the position of the commercial material, and based on the detected position information, while skipping the commercial material,
Recording the received digital data on a recording medium.

A digital data recording device of the present invention proposed to solve the above-mentioned problem is a digital data recording device for recording digital data of broadcast program material including commercial material, wherein the digital data is recorded on a recording medium. Recording means for recording; detecting means for detecting position information indicating the position of the commercial material inserted in the digital data; and, based on the detected position information, skipping the commercial material, Control means for controlling the recording means so as to record the digital data on a recording medium.

The digital data reproducing method of the present invention proposed to solve the above-mentioned problem is a digital data reproducing method for reproducing a broadcast program material including a commercial material recorded on a recording medium. And a reproducing step of reproducing digital data recorded on the recording medium while skipping the commercial material indicated by the detected position information. And characterized in that:

Further, a digital data reproducing apparatus of the present invention proposed to solve the above-mentioned problem is a digital data reproducing apparatus for reproducing a broadcast program material including a commercial material recorded on a recording medium. Reproducing means for reproducing digital data recorded in the
Detecting means for detecting position information indicating the position of the commercial material inserted in the digital data, and reproducing the digital data recorded on the recording medium while skipping the commercial material indicated by the detected position information Control means for controlling the reproduction means as described above.

According to the present invention described above, it is possible to realize a skip function of recording a digital broadcast program on a recording medium excluding a commercial part and / or reproducing the program from the recording medium.

[0043]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

As described above, in order to realize a so-called commercial skip function, the following two types of methods can be considered.

(1) Broadcast reception is performed continuously, and a commercial part is skipped during reproduction. (2) A broadcast part is specified and a commercial part is specified to be skipped and recorded. It is applicable to any of the above. Therefore, in the following, embodiments of each of the above methods will be described.

[1] Skip commercial parts during playback
First, a method of continuously recording a digital broadcast on a recording medium as usual and realizing a commercial skip at the time of reproduction will be described.

FIG. 1 shows an operation of skipping and reproducing a commercial part inserted in a transport stream of a digital broadcast using cue information.

In this system, a broadcast program is continuously received and recorded on a recording medium as it is. At this time, FIG.
As shown in (a), a packet in which the queue information 11 is written (PSI packet) and a commercial part CM are also:
All are recorded on a recording medium.

It should be noted that ISO / IEC13818-1 (M
In general, a method of defining queue information for each program as a private section of PSI (program specification information) specified in the PEG2 system).

On the other hand, when the transport stream of the above-mentioned broadcast program recorded on the recording medium is reproduced, the cue information 11 is monitored simultaneously with the reproduction, as shown in FIG. The information of the in-point and the information of the out-point described in (1) are extracted, and the area from the in-point to the out-point is skipped by a fast forward (FF) operation. As a result, only the main broadcast part A and the main broadcast part A 'are reproduced.

In this method, since all information of the broadcast program including the commercial part CM is once recorded on the recording medium, there is no possibility of a recording error. However, since a commercial portion CM that is not originally required is recorded, extra recording capacity of the recording medium is consumed, and when a magnetic tape is used as the recording medium, a time for fast-forwarding is required. It may cause rattling.
When a magneto-optical disk or the like is used as a recording medium, the time required for the fast-forwarding can be reduced to a level that does not pose a practical problem.

FIG. 2 shows a configuration example of a digital data recording / reproducing apparatus for realizing the above-described commercial skipping method.

All information sent from the broadcasting station is received by the receiving circuit 30 and is transmitted to the tape drive 3 such as a VTR device.
1 is recorded on the magnetic tape 35. At the time of reproduction, the stream is read from the magnetic tape 35 by the tape drive 31, decoded by the decoder 33,
The reproduced signal is output to the monitor 36 or the like.

At this time, the reproduction data read by the tape drive 31 is also supplied to the cue information detection circuit 32. The cue information detecting circuit 32 checks the positions of the in-point and out-point of the commercial part from the cue information in the reproduced data stream, generates a read control signal, and controls the tape drive 31 to skip the commercial part. I do. In this way, commercial skip during reproduction is realized.

As described above, all the information of the broadcast program including the commercial portion is once recorded on the recording medium, and from the in point to the out point based on the in point information and the out point information included in the cue information. By fast-forwarding between, a commercial skip can be performed.

[2] Specializing commercial part at broadcast reception
Next scheme constant to skip recording, by recording skips commercial portion at the time of recording of the broadcast program will be described scheme for realizing the commercial skip.

FIG. 3 shows an operation of skipping and recording a commercial part inserted into a transport stream of a digital broadcast using cue information.

The receiving means receives the broadcast program, monitors the entire contents of the broadcast program, and examines the IN point and the OUT point by extracting the queue information 102. Then, in the commercial part CM from the in point to the out point, the recording operation of the recording device is stopped, and control is performed so that the commercial part CM is not recorded on the recording medium.

According to this method, since the commercial portion CM is not recorded on the recording medium but only the main broadcast portion A and the main broadcast portion A ′ are continuously recorded, it is necessary to perform a special operation during reproduction. Thus, reproduced data as shown in FIG. 3C is obtained. Thereby, commercial skip is realized by the normal reproduction operation.

FIG. 4 shows an example of the configuration of a digital data recording / reproducing apparatus for realizing the commercial skipping system described above.

The received stream transmitted from the broadcasting station and received by the receiving circuit 30 is supplied to a tape drive 31 such as a VTR device and also to a queue information detecting circuit 32. The cue information detecting circuit 32 detects cue information in the received stream, checks the in-point and out-point of the commercial part from the detected cue information, and skips the commercial part according to a recording control signal so as to record. The operation of the tape drive 31 is controlled.
As such a control method, in the simplest case, the recording operation may be stopped only between the detected in-point and out-point.

Occurs.

As a result, the main broadcast portion A and the main broadcast portion A 'are continuously recorded on the magnetic tape 35 without recording the commercial portion CM, so that the commercial skip is performed by the normal continuous reproduction operation. Is realized.

As described above, while receiving the digital broadcast stream, the cue information included in the stream is detected, and the in-point / out-point of the commercial is checked from the detected cue information, thereby skipping the commercial part. Recording on a recording medium.

In the above description, when a digital television broadcast program is recorded on a recording medium such as a magnetic tape or a magneto-optical disk by a VTR device or the like, or when a digital television program recorded on these recording media is recorded. In the case of reproducing a method program, an example is described in which recording or reproduction is performed so as to skip a commercial part, but the application of the present invention is not limited to this.
For example, the present invention is applied to a video conference system and a video telephone system in which a moving image signal, an audio signal, and the like are transmitted from a transmission side to a reception side via a transmission line, and is also used for editing in various broadcasting devices. It is widely applicable.

[0066]

As described above, according to the present invention,
Based on the insertion information (queue information) of the commercial part inserted in the digital broadcast program, the commercial part is prevented from being recorded on the recording medium, or the digital broadcast program once recorded on the recording medium as it is is replaced with the commercial part. Since the playback is skipped, the commercial (C
M) The skip function can be realized also in digital broadcasting.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a skip reproduction operation using cue information.

FIG. 2 is a diagram illustrating a configuration example of a digital data recording / reproducing device that realizes commercial skipping using cue information.

FIG. 3 is a diagram for explaining a skip recording operation using queue information.

FIG. 4 is a diagram illustrating another configuration example of a digital data recording / reproducing device that realizes commercial skipping using cue information.

FIG. 5 is a diagram schematically showing a configuration of a conventional terrestrial broadcast.

FIG. 6 is a diagram for describing stream convergence processing;

FIG. 7 is a diagram illustrating a configuration example of a multiplexing system using a transport stream.

FIG. 8 is a diagram illustrating how a video signal and an audio signal are multiplexed to form a transport stream.

FIG. 9 is a diagram for explaining how a video signal and an audio signal are reproduced from a transport stream.

FIG. 10 is a diagram for explaining how queue information is used when performing a commercial insertion.

[Explanation of symbols]

Reference Signs List 30 receiving circuit, 31 tape drive, 32 queue information detecting circuit, 33 decoder, 35 magnetic tape, 36 monitor

Claims (13)

[Claims] 1. A digital data recording and reproducing method for recording digital data of a broadcast program material including a commercial material and reproducing the recorded digital data, comprising: a receiving step of receiving the digital data; A recording step of recording data on a recording medium; and recording the commercial material on the recording medium while skipping the commercial material based on position information indicating the position of the commercial material, which is inserted into the digital data recorded on the recording medium. And a reproducing step of reproducing the obtained digital data. 2. The digital data recording / reproducing method according to claim 1, wherein the position information includes start point position information and end point position information of a commercial material. 3. A digital data recording / reproducing apparatus for recording digital data of a broadcast program material including a commercial material and reproducing the recorded digital data, comprising: receiving means for receiving the digital data; Recording means for recording data on a recording medium; reproducing means for reproducing digital data recorded on the recording medium; detection means for detecting position information indicating the position of the commercial material inserted in the digital data; A digital data recording / reproducing apparatus comprising: a control unit that controls the recording unit and the reproducing unit so as to operate while skipping a commercial material indicated by the position information. 4. The digital data recording / reproducing apparatus according to claim 3, wherein said position information includes start point position information and end point position information of a commercial material. 5. A digital data recording method for recording digital data of a broadcast program material including a commercial material, comprising: a detecting step of detecting position information indicating a position of the commercial material inserted into the digital data; Recording the received digital data on a recording medium while skipping commercial material on the basis of the obtained position information. 6. The digital data recording method according to claim 5, wherein the position information includes start point position and end point position information of a commercial material. 7. A digital data recording apparatus for recording digital data of broadcast program material including commercial material, a recording means for recording the digital data on a recording medium, and a position of the commercial material inserted in the digital data. Detection means for detecting position information indicating the following; and control means for controlling the recording means so as to record the received digital data on a recording medium while skipping commercial material based on the detected position information. A digital data recording device comprising: 8. The digital data recording apparatus according to claim 7, further comprising receiving means for receiving the digital data. 9. The digital data recording apparatus according to claim 7, wherein the position information includes start point position information and end point position information of a commercial material. 10. A digital data reproducing method for reproducing a broadcast program material including a commercial material recorded on a recording medium, comprising: a detecting step of detecting position information indicating a position of the commercial material inserted into the digital data; Reproducing a digital data recorded on the recording medium while skipping a commercial material indicated by the detected position information. 11. The digital data reproducing method according to claim 10, wherein said position information includes start point position information and end point position information of a commercial material. 12. A digital data reproducing apparatus for reproducing broadcast program material including commercial material recorded on a recording medium, comprising: reproducing means for reproducing digital data recorded on the recording medium; Detecting means for detecting position information indicating the position of the commercial material, and the reproducing means for reproducing the digital data recorded on the recording medium while skipping the commercial material indicated by the detected position information. A digital data reproducing apparatus, comprising: a control unit for controlling. 13. The digital data reproducing apparatus according to claim 12, wherein the position information includes start point position information and end point position information of a commercial material.