JPH0917160A - Digital signal recording apparatus, digital signal reproducing apparatus and digital signal recording/ reproducing apparatus - Google Patents

Abstract

PURPOSE: To simultaneously confirm, as images, contents of a plurality of programs recorded in a tape in a digital signal recording/reproducing apparatus. CONSTITUTION: When input digital signals comprising a plurality of programs are recorded simultaneously, an important data extraction device 3 separates the digital signals for every program with reference to a program table, and extracts direct current component of DCT coefficient included in one frame as important data. A special reproduction data extraction device 4 generates a compressed screen of each program from the important data and feeds the data to a recording/processing device 5 as a special reproduction data. The recording/processing device 5 processes the input data by an error-correcting coding treatment, modulates and records the data to a magnetic tape 8. At the reproduction time, a recording data extraction device 11 extracts a special reproduction program and feeds the data to a reproduction data output device 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital signal recording apparatus for recording various kinds of digital image signals in a multiplexed manner according to program data, and a digital signal reproducing apparatus for facilitating reproduction of special reproduction digital image signals by searching program data. And a digital signal recording / reproducing device having the functions of both devices.

[0002]

2. Description of the Related Art Signals already compressed by an external device,
When recording a television signal compressed by inter-picture coding, a conventional digital VTR records and reproduces input data as it is. FIG. 8 is a block diagram showing the basic configuration of a conventional digital VTR that operates in this manner. In the following drawings, those denoted by the same reference numerals have the same configuration and function. The recording unit of the digital VTR includes an input terminal 1, a recording circuit 6 and a recording head 7, and the reproducing unit includes a reproducing head 9, a reproducing circuit 10 and an output terminal 2.

The digital signal input from the input terminal 1 at the time of recording is subjected to processing such as error correction coding and modulation in the recording circuit 6, and then the magnetic tape 8 is passed through the recording head 7.
Recorded above. During reproduction, the reproduction circuit 10 inputs the data read by the reproduction head 9 from the magnetic tape 8, performs processing such as data demodulation and error correction decoding, and outputs a reproduction signal from the output terminal 2.

[0004]

However, in the above-mentioned conventional configuration, when a plurality of programs are recorded on the magnetic tape, in order to confirm the contents of each program, up to the position where each data is recorded. After fast-forwarding or rewinding the magnetic tape, normal reproduction had to be performed for confirmation. Also, even when fast-forwarding or rewinding the magnetic tape, it is not known from which position on the magnetic tape the target data is recorded,
It was difficult to confirm the contents of each program.

The present invention has been made in view of such conventional problems, and a digital signal recording for extracting important data from a plurality of input digital signals and recording this as a special reproduction program on a recording medium. Realizing a device, a digital signal reproducing device for facilitating reproduction of target digital data from a recording medium in which a plurality of digital data are multiplexed and recorded by searching program data, and a function of both devices are provided. It is an object to realize a digital signal recording / reproducing device.

[0006]

According to a first aspect of the present invention, important data extracting means for extracting important data for each program from an input digital signal composed of a plurality of programs, and output of the important data extracting means. The special reproduction data generating means for generating a special reproduction signal used in special reproduction from the important data, the special reproduction signal generated by the special reproduction data generating means is a special reproduction program, the input digital signal is a normal reproduction program, and A recording means for adding the special reproduction program to the normal reproduction program and recording the data of each program at a predetermined position on the recording medium.

According to a second aspect of the present invention, the reproduction processing means for reading out the data of each program from the recording medium recorded by the digital signal recording apparatus according to the first aspect, and the reproduction data outputted by the reproduction processing means are usually used. Recording information extraction means for extracting the reproduction program name and special reproduction program name, and a normal reproduction program or special reproduction program from the output of the reproduction processing means based on the program name output by the recording information extraction means, and the data thereof. And a reproduction data output means for outputting.

According to a third aspect of the present invention, the special reproduction data generating means collects at least a plurality of reduced screen data at the time of recording to generate a special reproduction signal.

According to a fourth aspect of the present invention, the trick play data generating means records at least the relationship between the program identification signal and the normal play program and trick play program at the time of recording.

According to a fifth aspect of the present invention, important data extracting means for extracting important data for each program from an input digital signal consisting of a plurality of programs, and special reproduction from the important data output by the important data extracting means. Special reproduction data generating means for generating a special reproduction signal to be used sometimes, and signal identification information for generating signal identification information indicating that the special reproduction signal is a signal different from the input digital signal and adding it to the special reproduction signal. Data of a special reproduction program in which the special reproduction signal generated by the generation means and the special reproduction data generation means is a special reproduction program, the input digital signal is a normal reproduction program, and the normal reproduction program and the signal identification information are added. And a recording means for recording at a predetermined position on the recording medium. Is shall.

According to a sixth aspect of the present invention, important data extracting means for extracting important data for each program as a signal to be used during special reproduction from an input digital signal composed of a plurality of programs, and the input digital signal are normally reproduced. And a recording means for adding important data output from the important data extracting means to the normal reproduction program and recording the data at a predetermined position on a recording medium. is there.

According to a seventh aspect of the present invention, a reproduction processing means for reading data from a recording medium recorded by the digital signal recording apparatus according to the sixth aspect, and reproduction data output from the reproduction processing means are used as important data or A signal identification information generating means for extracting signal identification information indicating the number of the normal reproduction program, and a reproduction for switching and outputting the normal reproduction program or important data as a special reproduction program based on the signal identification information output by the signal identification information generating means. And a data output unit.

In the invention of claim 8 of the present application, the special reproduction data generating means collects at least a plurality of reduced screen data at the time of recording to generate a special reproduction signal.

According to a ninth aspect of the present invention, the special reproduction data generating means records at least the relationship between the signal identification signal and the normal reproduction program or the special reproduction program at the time of recording.

According to a tenth aspect of the present invention, important data extracting means for extracting important data for each program from an input digital signal consisting of a plurality of programs, and special reproduction from the important data output by the important data extracting means. Special reproduction data generating means for generating special reproduction signals used at times, and output time information generating means for generating output time information when the special reproduction data generating means outputs the special reproduction signal based on the input digital signal And a special reproduction signal generated by the special reproduction data generation means as a special reproduction program, the input digital signal as a normal reproduction program, and the data of the special reproduction program including the normal reproduction program and the output time information as a recording medium. A recording means for recording at a predetermined position above. It is intended.

According to the invention of claim 11 of the present application, reproduction processing means for reading data from the recording medium recorded by the digital signal recording device according to claim 6 and output time information from the reproduction data output by the reproduction processing means. Output time information generating means for taking out, and reproduction data output means for switching and outputting the normal reproduction program or the important data as a special reproduction program based on the output time information outputted by the output time information generating means. It is a feature.

According to a twelfth aspect of the present invention, important data extracting means for extracting important data for each program from an input digital signal composed of a plurality of programs, and the input digital signal as a normal reproduction program, the normal reproduction. From the reproduction processing means, a recording means for adding the important data output from the important data extracting means to a program and recording the data on the data, a reproduction processing means for reading data from a recording medium recorded by the recording means, and the reproduction processing means Special reproduction signal generation means for extracting the important data and generating a special reproduction signal, and reproduction data for selecting a normal reproduction program or a special reproduction program from the reproduction processing means or the special reproduction signal generation means and outputting the selected data. And an output means.

In the thirteenth and fourteenth aspects of the present invention, the recording means records the important data or the special reproduction program in an area where the reproducing head passes when the recording medium is reproduced at high speed. It is characterized by that.

[0019]

According to the invention (first invention) of the first aspect of the present invention having such a feature, the important data extraction means receives the digital signal consisting of a plurality of programs, and the important data for each program is important. Extract the data. The special reproduction data generation means generates a special reproduction signal used for special reproduction from the important data. The recording means adds the special reproduction signal to the input digital signal as a special reproduction program and records the data of each program at a predetermined position on the recording medium.

According to the second aspect of the present invention (the second aspect), the reproduction processing means reads the data of each program from the recording medium recorded by the digital signal recording apparatus according to the first aspect. The recorded information extraction means extracts the normal reproduction program name and the special reproduction program name from the reproduction data output by the reproduction processing means. Then, the reproduction data output means selects the normal reproduction program or the special reproduction program from the output of the reproduction processing means based on the program name output by the recording information extraction means and outputs the data.

According to the invention of claim 5 (third invention) of the present application, the important data extracting means extracts the important data for each program from the input digital signal composed of a plurality of programs. The special reproduction data generation means generates a special reproduction signal used for special reproduction from the important data output by the important data extraction means. The signal identification information generating means generates signal identification information indicating that the special reproduction signal is a signal different from the input digital signal, and adds the signal identification information to the special reproduction signal. The recording means uses the special reproduction signal generated by the special reproduction data generating means as the special reproduction program, the input digital signal as the normal reproduction program, and the normal reproduction program and the data of the special reproduction program to which the signal identification information is added on the recording medium. Record in place.

According to the invention of claim 7 (the fourth invention) of the present application, the reproduction processing means reads data from the recording medium recorded by the digital signal recording device of claim 6. The signal identification information generating means extracts the signal identification information indicating the important data or the number of the normal reproduction program from the reproduction data output by the reproduction processing means. The reproduction data output means switches and outputs the normal reproduction program or the important data as a special reproduction program based on the signal identification information output by the signal identification information generating means.

According to the tenth aspect of the present invention (fifth aspect), the important data extracting means extracts the important data for each program from the input digital signal composed of a plurality of programs. The special reproduction data generation means generates a special reproduction signal used for special reproduction from the important data output by the important data extraction means. The output time information generating means generates output time information when the special reproduction data generating means outputs the special reproduction signal based on the input digital signal. The recording means uses the special reproduction signal generated by the special reproduction data generating means as the special reproduction program, the input digital signal as the normal reproduction program, and the special reproduction program data including the normal reproduction program and the output time information on the recording medium. Record at the position.

According to the eleventh aspect of the present invention (sixth aspect), the reproduction processing means reads the data from the recording medium recorded by the digital signal recording apparatus according to the sixth aspect. The output time information generating means extracts the output time information from the reproduction data output by the reproduction processing means. Then, the reproduction data output means switches and outputs the normal reproduction program or the important data as the special reproduction program based on the output time information output from the output time information generating means.

Further, according to the invention of claim 12 of the present application (seventh invention), the important data extracting means extracts the important data for each program from the input digital signal consisting of a plurality of programs. The recording means uses the input digital signal as a normal reproduction program, adds the important data output from the important data extraction means to the normal reproduction program, and records the data at a predetermined position on the recording medium. The reproduction processing means reads the data from the recording medium recorded by the recording means. The special reproduction signal generation means extracts important data from the reproduction processing means and generates a special reproduction signal. Then, the reproduction data output means selects the normal reproduction program or the special reproduction program from the reproduction processing means or the special reproduction signal generating means and outputs the data.

As described above, in the first to seventh inventions, it becomes easy to confirm the contents of the plurality of programs recorded in the magnetic tape as an image. Further, in the third and fourth inventions, the PI recorded in the program in the input digital signal is added to the special reproduction program during recording or reproduction.
By adding the same PID as D, the special reproduction program can be handled as a program similar to the program in the input digital signal. Therefore, the process of program selection during reproduction becomes easy. Further, in the fifth and sixth inventions, since the PCR is added to or rewritten to the trick play program, the accuracy of the synchronization timing at the time of output is improved.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A digital signal recording device and a digital signal reproducing device according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing the basic configuration of a digital signal recording device A1 and a digital signal reproducing device B1 of the first embodiment. In FIG. 1, the digital signal recording device A1 is configured to include an input terminal 1, an important data extractor 3, a special reproduction data generator 4, a recording processor 5, a recording circuit 6, and a recording head 7. The digital signal reproducing device B1 is composed of a reproducing head 9, a reproducing circuit 10, a recorded information extractor 11 and a reproduced data output device 12.

The digital signal recording device A1 is a device for inputting a plurality of digital signals (images etc.) transmitted from, for example, a communication satellite, a broadcasting satellite, a CATV center, and digitally recording these programs. A digital signal consisting of a plurality of programs input from the input terminal 1 is sent to the recording processor 5 and the important data extractor 3.
The program mentioned here indicates whether the content of the input digital signal is audio, video, or character information. In the case of a plurality of video signals, the program includes a channel number.

The important data extractor 3 is information on a program included in the input signal (hereinafter referred to as a program table).
Is a circuit for extracting each program of the input signal according to the program table. The important data extractor 3 extracts the DC component of the orthogonal transform coefficient of the frame (hereinafter referred to as I frame) signal, which has been subjected to the intra-frame encoding process from the video signal compressed by MPEG of each separated program, as important data. To do. The DC component in the orthogonal transform coefficient of each program, which is important data, is output to the special reproduction data generator 4.

The special reproduction data generator 4 forms a reduced screen at the time of high speed reproduction from the important data of each program, and forms a frame similar to the pixel format of the input digital signal from the reduced screen. When displaying these reduced screens on the display device, images of a plurality of programs are displayed at the same time. These data are called special reproduction data. Then, the trick play data generator 4 adds the decoding information and the transfer information included in the input signal to the trick play data to create a trick play program.

FIG. 2 is an explanatory diagram of a process of forming a reduced screen from the DC component of each program and forming a frame similar to the pixel format of the input digital signal from each reduced screen. The important data extractor 3 extracts a program table, decoding information, and transfer information from the input signal.
In process 201, each program is decoded and the I frame signal of each program is taken out. Process 2
In 02, the DC component of each block of the I frame signal is detected. Then, in the process 203, orthogonal transform coefficients performed in block units of 8 pixels both vertically and horizontally are collected for 4 blocks (hereinafter referred to as macroblocks), and the average value thereof is used as a representative value of 4 blocks. In the process 204, each representative value of the macro blocks of the four programs is encoded.

Next, auxiliary information common to the input signal is added to the encoded data to generate special reproduction data for four programs A to D having the same format as the input signal. The special reproduction program including the special reproduction data is sent to the recording processor 5 of FIG. 1 in the same manner as the input digital signal.
The recording processor 5 controls the signal arrangement of the input digital signal and the special reproduction program so that the signal is recorded according to the recording arrangement of the input digital signal and the special reproduction program on the magnetic tape. It is assumed that the special reproduction program signal is recorded in a partial area of each track which is obliquely scanned when the magnetic tape is fed at a high speed at a predetermined double speed ratio.

The recording circuit 6 receives the signal from the recording processor 5 and performs processing such as error correction coding and modulation. Then, the recording circuit 6 records the input digital signal via the recording head 7 on a normal track as data for normal reproduction programming, and records the data for special reproduction program on a special track locus. In this way, the data for normal reproduction and the data for special reproduction are recorded on the magnetic tape 8.

At the time of reproducing the data, the reproducing circuit 10 reads the data from the magnetic tape 8 via the reproducing head 9 and performs processing such as data demodulation and error correction decoding.
These data are given to the reproduction data output device 12 and the recorded information extraction device 11. The recording information extractor 11 selects a screen output program from the normal reproduction program and the special reproduction program among the programs recorded on the magnetic tape 8 and outputs the information to the reproduction data output device 12. The reproduction data output device 12 outputs the normal reproduction program or the special reproduction program selected by the recording information extractor 11.

In this case, when the special reproduction program output is selected, a plurality of special reproduction programs are collectively reproduced as shown in FIG. 2, so that the magnetic tape 8 is fed at high speed. The contents of the program recorded in 8 can be easily searched.

The recording processor 5 and the recording circuit 6 use the special reproduction signal generated by the special reproduction data generator 4 as the special reproduction program, the input digital signal as the normal reproduction program, and the special reproduction program as the normal reproduction program. Recording means is added to record the data of each program at a predetermined position on the magnetic tape 8. The reproduction circuit 10 and the recorded information extractor 11 constitute reproduction processing means for reading the data of each program from the magnetic tape 8.

Next, a digital signal recording apparatus and a digital signal reproducing apparatus according to the second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a block diagram showing the basic configuration of the digital signal recording device A2 and the digital signal reproducing device B2 of the second embodiment. In FIG. 3, the digital signal recording device A2 has an input terminal 1 and an important data extractor 1.
6, a recording processor 40, a recording circuit 6, and a recording head 7. The digital signal reproducing device B2 is composed of a reproducing head 9, a reproducing circuit 10, a recording information extractor 15, a special reproduction data generator 17, a reproduction data output device 12 and an output terminal 2.

An input digital signal consisting of a plurality of programs input from the input terminal 1 is sent to the recording processor 40 and the important data extractor 16. The important data extractor 16 extracts the program table as in the first embodiment, and separates each program of the input digital signal according to the program table. The important data extractor 16 extracts the DC component of the orthogonal transformation coefficient of the I frame signal as important data from each of the separated programs.

The extracted important data is sent to the recording processor 40. The recording processor 40 controls the signal arrangement of the input digital signal and the special reproduction program so that they are recorded according to the recording arrangement of the input digital signal (normal reproduction program) and the special reproduction program on the magnetic tape 8.
The recording circuit 6 receives the signal from the recording processor 40, performs processing such as error correction coding and modulation, and records data on the magnetic tape 8 via the recording head 7.

When reproducing data, the reproducing circuit 10 reads the data from the magnetic tape 8 through the reproducing head 9,
Data is demodulated and processing such as error correction decoding is performed. This data is reproduced data output device 12, recording information extractor 15,
And the special reproduction data generator 17. The recorded information extractor 15 examines the programs forming the digital signal recorded on the magnetic tape 8 and sends the information of each program to the special reproduction data generator 17. Further, the recording information extractor 15 sends the decoding information and the transfer information included in the input signal to the special reproduction data generator 17.

The special reproduction data generator 17 forms a reduced screen from important data and generates special reproduction data. Then, the decoding information and the transfer information included in the input signal are added to the special reproduction data to create a special reproduction program. The reproduction data output device 12 outputs a normal reproduction program or a special reproduction program. In this case, when the output of the special reproduction program is selected, the special reproduction program is reproduced as shown in FIG. 2, so that the contents of the program recorded in the magnetic tape 8 can be easily searched.

Next, a digital signal recording apparatus and a digital signal reproducing apparatus according to the third embodiment of the present invention will be described with reference to FIG. FIG. 4 is a block diagram showing the basic configuration of the digital signal recording device A3 and the digital signal reproducing device B3 of the third embodiment. In FIG. 4, the digital signal recording device A3 includes an input terminal 1, an important data extractor 3, a recording processor 5, a recording circuit 6, a recording head 7, a signal identification information generator 18, and a special reproduction data generator 19. It The digital signal reproducing device B3 is constituted by including a reproducing head 9, a reproducing circuit 10, a reproduced data output device 20, a recorded information extractor 21, and an output terminal 2.

Input digital signals consisting of a plurality of programs input from the input terminal 1 are given to the recording processor 5, the important data extractor 3 and the signal identification information generator 18, respectively. The important data extractor 3 extracts the program table and separates each program of the input digital signal according to the program table. The important data extractor 3 extracts the DC component of the orthogonal transformation coefficient of the I frame signal from the separated programs as important data.

The DC component of each program, which is important data, is output 6 to the special reproduction data generator 19. In the special reproduction data generator 19, a reduced screen is formed from the orthogonal components of each program, and special reproduction data similar to the pixel format of the input digital signal which is a normal reproduction program is generated from each reduced screen. And special reproduction data generator 19
Creates the special reproduction program by adding the decoding information and the transfer information included in the input signal to the special reproduction data. As the process of forming the trick-play program, the same processing as that shown in FIG. 2 is performed.

The signal identification information generator 18 is provided with program identification information (hereinafter referred to as P
It is called ID. ) Is detected and output to the special reproduction data generator 19. The trick play data generator 19 assigns a PID value other than the PID of each program in the input digital signal to the trick play program and adds it to the trick play program. The special reproduction program is sent to the recording processor 5 in the same manner as the input digital signal. The recording processor 5 controls the signal arrangement of the input digital signal and the special reproduction program so that the recording is performed according to the recording arrangement of the input digital signal and the special reproduction program on the magnetic tape 8. The output from the recording processor 5 is given to the recording circuit 6, and processing such as error correction coding and modulation is performed. This data is recorded on the magnetic tape 8 via the recording head 7.

When reproducing data, the reproducing circuit 10 reads the data on the magnetic tape 8 via the reproducing head 9.
Then, the reproduction circuit 10 performs processing such as demodulation and error correction decoding of the read data, and gives the data to the reproduction data output device 20 and the recorded information extractor 21. The recording information extractor 21 extracts the PID from the normal reproduction program and the special reproduction program in order to extract the program at the time of screen output among the programs recorded on the magnetic tape 8, and the PID is extracted to the reproduction data output device 20. Output. The reproduction data output device 20 outputs the normal reproduction program or the special reproduction program indicated by the PID.

In this case, when the output of the special reproduction program is selected, the special reproduction program created from each program recorded in the input digital signal is reproduced as shown in FIG. It becomes easy to search the contents of the program recorded in. By adding a PID similar to the PID recorded in the program in the input digital signal to the special reproduction program, the special reproduction program can be treated as a program similar to the normal reproduction program. In this case, the process of program selection during reproduction becomes easier.

Next, a digital signal recording apparatus and a digital signal reproducing apparatus according to the fourth embodiment of the present invention will be described with reference to FIG. FIG. 5 is a block diagram showing the basic configuration of the digital signal recording device A4 and the digital signal reproducing device B4 of the fourth embodiment. In FIG. 5, the digital signal recording device A4 has an input terminal 1 and an important data extractor 1.
6, a recording processor 40, a recording circuit 6, and a recording head 7. The digital signal reproducing device B4 includes a reproducing head 9, a reproducing circuit 10, a recorded information extractor 22, a signal identification information generator 23, a special data generator 24, a reproduced data output device 25, and an output terminal 2.

In FIG. 5, a digital signal recording device A4
Performs the same processing as in the second embodiment. When reproducing data, the reproducing circuit 10 reads the data from the magnetic tape 8 via the reproducing head 9. Then, the reproduction circuit 10 performs processing such as demodulation and error correction decoding of the read data.
The data is reproduced data output device 25, recorded information extraction device 2
2, provided to the signal identification information generator 23. The recorded information extractor 22 examines the programs forming the digital signal recorded on the magnetic tape 8 and supplies the information of each program to the special reproduction data generator 24.

The special reproduction data generator 24 forms a reduced screen from important data and generates special reproduction data. Then, the special reproduction data generator 24 adds the decoding information and the transfer information included in the input signal to the special reproduction data,
Create a trick-play program. Signal identification information generator 2
3 detects the PID of each reproduced program. When the trick play data generator 24 is given PID information,
P other than PID of each program in the input digital signal
The value of ID is assigned to the special reproduction program and added to the special reproduction program.

The reproduction data output device 25 inputs the PID of the output program from the signal identification information generator 23 among the PID of the normal reproduction program and the PID of the special reproduction data. The reproduction data output device 25 outputs a normal reproduction program or a special reproduction program according to the input PID.

In this case, if the output of the special reproduction program is selected, the special reproduction program is reproduced from each program recorded in the input digital signal as shown in FIG. It becomes easy to search the contents of the program. Also, by adding a PID similar to the PID recorded in the program in the input digital signal as the special reproduction program at the time of reproduction, the special reproduction program can be handled as a program similar to the normal reproduction program. The program selection process becomes easy.

Information contained in an MPEG bit stream, which is an MPE including a video and audio decoder
In the G system decoder, if the information for setting and calibrating the value of the STC (basic synchronization signal) that is the time reference to the value intended by the encoder side is PCR, in the present embodiment, the special reproduction program is set. Since the PCR is added or rewritten, the accuracy of the synchronization timing at the time of output is improved.

Next, a digital signal recording device and a digital signal reproducing device according to the fifth embodiment of the present invention will be described with reference to FIG. FIG. 6 is a block diagram showing the basic configuration of the digital signal recording device A5 and the digital signal reproducing device B5 of the fifth embodiment. In FIG. 6, the digital signal recording device A5 includes an input terminal 1, an important data extractor 3, a special reproduction data generator 26, and an output time information generator 2.
7, a recording processor 5, a recording circuit 6, and a recording head 7. The digital signal reproducing device B5 is composed of a reproducing head 9, a reproducing circuit 10, a recorded information extractor 29, a reproduced data output device 28, and an output terminal 2.

An input digital signal consisting of a plurality of programs input from the input terminal 1 is given to the recording processor 5, the important data extractor 3 and the output time information generator 27.
The important data extractor 3 extracts the program table and separates each program of the input digital signal according to the program table. Then, the DC component of the orthogonal transform coefficient of the I frame signal is extracted as important data from each of the separated programs. The DC component of each program, which is important data, is output to the special reproduction data generator 26. The special reproduction data generator 26 forms a reduced screen from orthogonal components of each program, generates special reproduction data similar to the pixel format of an input digital signal which is a normal reproduction program from each reduced screen, and includes it in the input signal. The decryption information and the transfer information are added to the special reproduction data to create a special reproduction program. As the process of forming the trick-play program, the same processing as that shown in FIG. 2 is performed.

The output time information generator 27 determines the program time reference value (P) of each program in the input digital signal.
CR) is detected. The output time information generator 27 outputs the PCR information to the trick play data generator 26. The special reproduction data generator 26 adds the same value as each program in the input digital signal to the special reproduction program. This special reproduction program is sent to the recording processor 5 similarly to the input digital signal. The recording processor 5 controls the signal arrangement of the input digital signal and the special reproduction program so that the recording is performed according to the recording arrangement of the input digital signal and the special reproduction program on the magnetic tape 8. The recording circuit 6 performs processing such as error correction coding and modulation on the output from the recording processor 5, and records data on the magnetic tape 8 via the recording head 7.

At the time of reproducing the data, the reproducing circuit 10 performs processing such as demodulation and error correction decoding of the data read from the magnetic tape 8 through the reproducing head 9, and outputs this data to the reproduction data output device 28 and the recorded information. Send to the extractor 29. The recording information extractor 29 selects a program at the time of screen output from the programs recorded on the magnetic tape 8 from the normal reproduction program and the special reproduction program, and gives the information of the selected program to the reproduction data output device 28.
The reproduction data output device 20 outputs the normal reproduction program or special reproduction program selected by the recording information extractor 21 according to PCR.

In this case, if the special reproduction program output is selected, the special reproduction program created from each program recorded in the input digital signal at the time of recording is reproduced as shown in FIG. It becomes easy to search the contents of the program recorded in.

Next, a digital signal recording apparatus and a digital signal reproducing apparatus according to the sixth embodiment of the present invention will be described with reference to FIG. FIG. 7 is a block diagram showing the basic arrangements of a digital signal recording device A6 and a digital signal reproducing device B6 of the sixth embodiment. In FIG. 7, the digital signal recording device A6 has an input terminal 1 and an important data extractor 1.
6, a recording processor 40, a recording circuit 6, and a recording head 7. The digital signal reproducing device B6 is configured to include a reproducing head 9, a reproducing circuit 10, a recorded information extractor 30, an output time information generator 31, a special reproduction data generator 32, a reproduction data output device 25, and an output terminal 2. It

At the time of reproducing the data, the reproducing circuit 10 performs processing such as demodulation and error correction decoding of the data read from the magnetic tape 8 via the reproducing head 9, and outputs the data to the reproduction data output device 25 and the recording information. It is sent to the extractor 30 and the output time information generator 31. The recorded information extractor 30 examines the programs constituting the digital signal recorded on the magnetic tape 8 and sends the information of each program to the special reproduction data generator 32. The special reproduction data generator 32 forms a reduced screen from the important data and generates special reproduction data.
Then, the trick play data generator 32 adds the decoding information and the transfer information included in the input signal to the trick play data to create a trick play program.

The output time information generator 31 detects the PCR of each program in the reproduced digital signal and supplies it to the special reproduction data generator 32. The special reproduction data generator 32 determines the PCR of the special reproduction program based on the PCR information of each program in the reproduction digital signal and adds it to the special reproduction program.

The reproduction data output device 25 outputs the normal reproduction program or the special reproduction program according to the PCR.
In this case, when the output of the special reproduction program is selected, the special reproduction program created from each program recorded in the input digital signal as shown in FIG. 2 is reproduced, so that the special reproduction program is recorded in the magnetic tape. It is easy to search the contents of existing programs. Further, since the PCR is added or rewritten to the special reproduction program, the accuracy of the synchronization timing at the time of output is improved.

[0063]

As described above, in the first to seventh inventions, it becomes easy to simultaneously confirm the contents of a plurality of programs recorded in the magnetic tape as a reduced image.

Further, in the third and fourth inventions, the special reproduction program is added to the special reproduction program at the time of recording or reproduction to add the program identification signal similar to the program identification signal recorded in the program in the input digital signal. The program can be treated as a program similar to the program in the input digital signal. Therefore, by referring to the program identification signal, the process of program selection during reproduction becomes easy.

Further, in the fifth and sixth inventions, the output time information is added or rewritten to the special reproduction program, so that the accuracy of the synchronization timing at the time of output is improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of a digital signal recording device and a digital signal reproducing device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a special reproduction program creation process.

FIG. 3 is a block diagram showing a basic configuration of a digital signal recording device and a digital signal reproducing device according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing a basic configuration of a digital signal recording device and a digital signal reproducing device according to a third embodiment of the present invention.

FIG. 5 is a block diagram showing a basic configuration of a digital signal recording device and a digital signal reproducing device according to a fourth embodiment of the present invention.

FIG. 6 is a block diagram showing a basic configuration of a digital signal recording device and a digital signal reproducing device according to a fifth embodiment of the present invention.

FIG. 7 is a block diagram showing a basic configuration of a digital signal recording device and a digital signal reproducing device according to a sixth embodiment of the present invention.

FIG. 8 is a block diagram showing a basic configuration of a conventional digital signal recording device and digital signal reproducing device.

[Explanation of symbols]

1 Input Terminal 2 Output Terminal 3, 16 Important Data Extractor 4, 17, 19, 24, 26, 32 Special Reproduction Data Generator 5, 40 Recording Processor 6 Recording Circuit 7 Recording Head 8 Magnetic Tape 9 Reproducing Head 10 Reproducing Circuit 11, 15, 21, 22, 29, 30 Recording information extractor 12, 20, 28 Reproduction data output device 18, 23 Signal identification information generator 27, 31 Output time information generator

Claims (14)

[Claims] 1. An important data extraction means for extracting important data for each program from an input digital signal composed of a plurality of programs, and a special reproduction signal used for special reproduction from the important data output by the important data extraction means. Special reproduction data generating means, a special reproduction signal generated by the special reproduction data generating means is a special reproduction program, the input digital signal is a normal reproduction program, and the special reproduction program is added to the normal reproduction program. A digital signal recording apparatus comprising: a recording unit that records program data at a predetermined position on a recording medium. 2. A reproduction processing means for reading out data of each program from a recording medium recorded by the digital signal recording apparatus according to claim 1, and a normal reproduction program name and a special reproduction program from reproduction data outputted by the reproduction processing means. Recording information extraction means for extracting a name, and reproduction data output means for selecting a normal reproduction program or a special reproduction program from the output of the reproduction processing means based on the program name output by the recording information extraction means and outputting the data. A digital signal reproducing apparatus comprising: 3. The digital signal recording apparatus according to claim 1, wherein the special reproduction data generating means collects at least a plurality of reduced screen data at the time of recording to generate a special reproduction signal. 4. The digital signal recording apparatus according to claim 1, wherein the trick play data generating means records at least the relationship between the program identification signal and the normal play program and the trick play program at the time of recording. 5. An important data extraction means for extracting important data for each program from an input digital signal composed of a plurality of programs, and a special reproduction signal used for special reproduction from the important data output by the important data extraction means. And special reproduction data generating means for generating signal identification information indicating that the special reproduction signal is a signal different from the input digital signal and adding the signal identification information to the special reproduction signal. The special reproduction signal generated by the data generating means is used as a special reproduction program, the input digital signal is used as a normal reproduction program, and the normal reproduction program and the data of the special reproduction program to which the signal identification information is added are stored in a predetermined format on a recording medium. Recording means for recording at a position, and digital signal recording characterized by the following: apparatus. 6. An important data extracting means for extracting important data for each program as a signal used in special reproduction from an input digital signal composed of a plurality of programs; and a normal reproduction program, wherein the input digital signal is a normal reproduction program. A recording means for adding important data output from the important data extracting means to the above and recording the data at a predetermined position on a recording medium. 7. A reproduction processing means for reading data from a recording medium recorded by the digital signal recording apparatus according to claim 6, and reproduction data output from the reproduction processing means, indicating the number of the important data or the normal reproduction program. Signal identification information generating means for extracting the signal identification information, and reproduction data output means for switching and outputting the normal reproduction program or the important data as a special reproduction program based on the signal identification information output by the signal identification information generating means. A digital signal reproducing device characterized by: 8. The digital signal recording apparatus according to claim 5, wherein said special reproduction data generating means collects at least a plurality of reduced screen data at the time of recording to generate a special reproduction signal. 9. The digital signal recording apparatus according to claim 5, wherein the trick play data generating means records at least the relationship between the signal identification signal and the normal play program and the trick play program at the time of recording. . 10. An important data extracting means for extracting important data for each program from an input digital signal composed of a plurality of programs, and a special reproduction signal used for special reproduction from the important data output by the important data extracting means. Special reproduction data generating means, output time information generating means for generating output time information when the special reproduction data generating means outputs the special reproduction signal based on the input digital signal, and special reproduction data generation The special reproduction signal generated by the means is a special reproduction program, the input digital signal is a normal reproduction program, and the data of the special reproduction program including the normal reproduction program and the output time information is recorded at a predetermined position on a recording medium. And a recording means for storing the digital signal. Place. 11. A reproduction processing means for reading data from a recording medium recorded by the digital signal recording apparatus according to claim 6, and an output time information generating means for extracting output time information from reproduction data output from the reproduction processing means. And a reproduction data output means for switching and outputting the normal reproduction program or the important data as a special reproduction program based on the output time information output from the output time information generating means. . 12. An important data extracting means for extracting important data for each program from an input digital signal consisting of a plurality of programs; and a normal reproduction program for the input digital signal, wherein the important data extracting means is included in the normal reproduction program. Recording means for adding the important data to be output and recording the important data, reproduction processing means for reading data from the recording medium recorded by the recording means, and extracting the important data from the reproduction processing means. Special reproduction signal generation means for generating a special reproduction signal, and reproduction data output means for selecting a normal reproduction program or a special reproduction program from the reproduction processing means or the special reproduction signal generation means and outputting the data. A digital signal recording / reproducing apparatus characterized by the above. 13. The recording means records the important data or the special reproduction program in an area through which a reproduction head passes when the recording medium is reproduced at high speed. Item 1. The digital signal recording device according to any one of items 1, 3, 4, 5, 6, 8, 9, and 10. 14. The recording means, when recording the important data or the special reproduction program on a recording medium, records the area in which a reproducing head passes when the recording medium is reproduced at a high speed. Item 12. A digital signal recording / reproducing device according to item 12.