JPH01175472A - Digital recording and reproducing device - Google Patents

Abstract

PURPOSE:To record and reproduce video signals of plural systems by one set of device by discriminating a system of a video signal to be recorded, generating a recording digital signal by a recording format corresponding to said system and recording a system discriminating signal together with the recording digital signal in a recording medium. CONSTITUTION:A signal system discriminating circuit 16 discriminates automatically a system of a supply video signal, cased on a video output signal which has been supplied from a switching circuit 15, generates a recording use system discriminating signal 17 for showing the system and supplies it to a video signal recording and processing circuit 18. In the video signal recording circuit 18, a recording signal processing is executed satisfactorily by a prescribed format corresponding to a system of an input video signal by the system discriminating signal 17. Also, the signal corresponding to the system discriminating signal 17 is added at the time of performing the recording signal processing, and the system discriminating signal 17 is recorded together with the video signal in a magnetic tape 30. In such a way, it is unnecessary to designate a specific system to external input terminals 8, 9, and the use convenience is extremely satisfactory to a user.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a device that converts a video signal, etc. into a digital signal, records it on a recording medium, and reproduces the same, and in particular, the present invention relates to a device that converts a video signal, etc. into a digital signal, records it on a recording medium, and plays it back. The present invention relates to a digital recording and reproducing device that can record and reproduce data.

[Conventional technology]

Conventionally, digital recording and reproducing apparatuses have used a certain specific signal method (hereinafter simply referred to as a method), as described in, for example, Japanese Patent Laid-Open No. 77912/1983.

It was designed to be able to record and play back only video signals of 1 and 2, and no consideration was given to recording and playing back video signals of other different systems.

By the way, recently, based on the development of image processing technology and LSI technology, the image quality is being improved by improving the broadcasting system. In other words, the current broadcasting system (NTSC system, PA
EDTV (Extend
d Definition TV) Broadcasting, HD uses approximately twice as many scanning lines as current television to dramatically improve image quality.
TV (High Definition TV)
Broadcasting is about to start. In particular, as an HDTV system, a system with wideband characteristics as shown in Figure 10 has been proposed, and for broadcasting, a band compression system that compresses the signal band and transmits it efficiently is shown in Figure 11. Proposed.

That is, in addition to the current system that has been widely used up until now, a new high-quality system as described above has been launched, and users can now use video signals of a plurality of systems depending on their purpose.

Here, a digital recording/playback device that can record and play back an input video signal with almost no deterioration by first converting the video signal into a digital signal and recording it can accept video signals of not only the current format but also the above-mentioned high-quality format. Being able to record and reproduce data well is an important function for users.

[Problem that the invention seeks to solve]

On the other hand, the above-mentioned conventional technology takes into account the fact that it can record and reproduce all the video signals of high-quality formats that will become popular in the future in addition to the current format. It is necessary to use a plurality of digital recording and reproducing devices compatible with the above and replace them while operating the device, which has the drawback of causing great inconvenience for the user in terms of ease of use and economically.

SUMMARY OF THE INVENTION An object of the present invention is to provide a digital recording and reproducing apparatus that can easily and favorably record and reproduce video signals of a plurality of systems for as long as possible.

[Means for solving problems]

The above object is to provide a recording signal system identification means for identifying the video signal system from an input video signal to be recorded; video signal recording processing means for generating a signal to be supplied to a recording medium by performing recording signal processing according to the recording format of each system on the signal from which the synchronization signal portion has been removed; and an output signal from the recording signal system identification means. a method identification signal recording means for recording a video signal on a recording medium; a reproduction signal method identification means for identifying a method of a reproduced video signal according to a signal detected from the recording medium; synchronization signal generation means; first switching means for selecting and outputting one of the plurality of synchronization signal generation means according to the output signal from the reproduction signal method identification means; a video signal reproduction processing means for performing reproduction signal processing on the digital signal in accordance with a format determined for each system, and then returning the digital signal to the original video signal (analog);
By providing a mixing means for mixing the synchronizing signal supplied from the switching means and the video signal supplied from the video signal reproduction processing means, good recording and reproduction of a plurality of systems can be achieved.

Moreover, by providing an external output terminal for video signals compatible with each system and a second switching means for switching and outputting the signal supplied from the mixing means to each output terminal, problems can be solved between various monitors. connection is achieved.

[Effect]

The video signal format to be recorded is identified by the recording signal format identifying means, and the video signal recording processing means generates a recording digital signal in a recording format corresponding to the format based on the recording format identification signal obtained. works. Further, the recording method identification signal is recorded on the recording medium together with the recording digital signal by the method identification signal recording means. As a result, regardless of the input video signal format, video signals of all formats can be recorded satisfactorily in the format specified for each format without any modification. A good control signal can be obtained when determining whether a signal is recorded or not during reproduction.

On the other hand, the reproduction signal method identification means obtains a reproduction method identification signal indicating the method of the reproduced video signal from the recording medium, and the video signal reproduction processing means uses the reproduction method identification signal to generate the reproduction signal in a format corresponding to the method. Processing is performed to restore the original video information. Further, the first switching means selects a synchronization signal of the same method as the reproduced video signal from among the plurality of periodic signal generation means according to the reproduction method identification signal, and then selects the synchronization signal of the same method as the reproduced video signal by the mixing means. The restored video information is mixed. As a result, it is possible to obtain a complete reproduced video signal including a synchronization signal, so that recording and reproduction can be realized for any type of video signal without malfunction. Furthermore, by removing the synchronization section and the like, it is possible to record for as long as possible.

Furthermore, the second switching means performs a switching operation so as to limit the format of the video signal supplied to each of the output terminals in accordance with the reproduction format identification signal. As a result, only the video signal of a certain specific system is outputted to each of the output terminals, so that good connection with various TV monitors compatible with each system can be made possible.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a digital recording and reproducing apparatus that can record and reproduce video signals of both the current NTSC system and the band-compressed (DTV) system shown in FIG.
1 is the main body of the digital recording/playback device, 2 is a wireless remote controller that controls the operation from the outside, and 3 is the H
TV that can receive both DVT and NTSC systems
Monitor 4 is a TV monitor that can only receive HDTV format,
5 is a TV monitor that can only receive NTSC format, 6 is HD
TVDTV system input terminal, 7 is NTSC system RF signal input terminal, 8.9 is external video input terminal, 10 is HDTV
11 is an output terminal to which an HDTV system video signal is output, 12 is an output terminal to which an NTSC system video signal is output, 13° and 14 are respective input terminals. HDTV system, NT
A tuner that generates a baseband video signal from an SC system RF signal, 15 a switching circuit, and 16 a system identification signal 17 that identifies the system of the video signal from the supplied video signal.
18 is a recording signal system identification circuit that outputs the signal (signal shown in figure), and 18 is an A/
A video signal recording processing circuit consisting of a D converter 19, a data compression channel division circuit 20 that compresses the digital signal and divides it into predetermined channels, and a recording modulation circuit 21 and 22 that converts the digital signal of each channel into data in a predetermined format. , 23 and 24 are recording amplifier circuits, 25 is a cylinder, 26 to 29 are magnetic heads, 30 is a magnetic tape as a recording medium, 31 is a capstan motor, and 32 is a control signal for controlling the operation of the magnetic tape (abbreviated as CTL signal). ), 33 is a capstan motor control circuit, 34 is a cylinder motor control circuit, 35 is a CTL control circuit that controls recording and reproduction of CTL signals, 36
37 is a preamplifier, 38 is a reproduction demodulation circuit 39, 40 that converts the signal detected from the magnetic tape into data in a predetermined format, and a data expansion channel synthesis circuit 41 that expands the data and combines it into one signal system. A video signal reproduction processing circuit consisting of a D/A converter 42 that converts a digital signal into an analog signal, 43 and 44 a synchronization signal generation circuit that generates a synchronization signal of a predetermined method, and 45 selects and outputs an input signal. 46 is a mixing circuit,
47, 52, and 53 are switching circuits that select and output inputs during recording and playback, and 48 is a system identification signal 49 that identifies the format of the reproduced video signal based on the signal detected from the magnetic tape.
50 and 51 are switching circuits, and 54 is a recording signal system display circuit that displays the system of the recorded video signal according to the system identification signal 17 supplied. , 55 is a reproduction signal system display circuit that displays the format of the reproduced video signal according to the supplied system identification signal 49, 56 is a remote control receiving circuit that receives signals from the wireless remote controllers 0 to 2, and 57 is a digital A main body controller 58 provided in the recording and reproducing apparatus main body 1 controls the digital recording and reproducing apparatus 1 by a signal from the remote control receiving circuit 56 or the main body controller 57.
System controller (system controller: +
, 59, 6o.

61 and 62 are the signals output from the system controller 58, and 5
9.60 are signals that control tuners 13 and 14, respectively■□
, VN, 61 is a control signal (VS) indicating a signal selected as a recording video signal from among the signals from input terminals 6 to 9.
, 62 is a control signal (v8) indicating the time of recording and the time of reproduction.

Next, the operation of the embodiment shown in FIG. 1 will be explained.

RF multiplied signals supplied to input terminals 6 and 7, respectively tuner 1
3.14), the baseband video signals are converted into HDTV and NTSC baseband video signals and then supplied to the switching circuit 15. A video signal to be recorded is selected from among the baseband tuner output signal and the baseband video signals supplied to the input terminals 8 and 9, and is supplied to the video signal recording processing circuit 18.

The video signal recording processing circuit 18 A/D converts the supplied video signal, then data compresses and channels the obtained digital signal according to a predetermined format depending on the method, and further rearranges the data. is performed to generate a recording digital signal. In addition, at least the synchronization signal part of the input video signal is removed and recorded to increase the recording time. Here, the signal system identification circuit 16 is
The video signal recording processing circuit 1 automatically identifies the format of the supplied video signal based on the video output signal supplied from the switching circuit 15 and generates a recording format identification signal 17 indicating the format.
8 is supplied with the method identification signal 18. Therefore, in the video signal recording circuit 18, the recording signal is processed satisfactorily in a predetermined format according to the format of the input video signal according to the format identification signal 17, and the obtained recording digital signal is sent to the recording amplifier 23. It is supplied to the magnetic heads 26 to 29 via the magnetic tape 30 and recorded on the magnetic tape 30. The video signal processing circuit 18 adds a signal corresponding to the system identification signal 17 when performing recording signal processing, and records the system identification signal 17 on the magnetic tape 30 together with the video signal.

Furthermore, the method identification signal 17 is also supplied to a capstan motor control circuit 33, a cylinder motor control circuit 34, and a CTL signal control circuit 35, and controls the running operation of the magnetic tape 30 and the cylinder 25 on which the magnetic heads 26 to 29 are mounted. The circuits 33, 34 and 35 operate so that the traveling operation is a predetermined operation according to each mode. Even if the video signal of the selected input terminal is HDTV format, it is NTSC.
Regardless of the format, recording and reproduction can be performed automatically and satisfactorily in each predetermined format. In particular, there is no need to designate a specific method for the external input terminals 8.9, which is very convenient for the user.

Further, the recording signal method display circuit 54 is a circuit that displays the method of the video signal to be recorded according to the method identification signal 17, and in particular, which method is used for the video signal supplied to the external input terminal 8.9. It is easy to recognize whether it is a signal or not. The video signal recording processing circuit 18 will be described in more detail later with reference to FIG.

On the other hand, during reproduction, signals detected by the magnetic heads 26 to 29 are supplied to a video signal reproduction processing circuit 38 via preamplifiers 36 and 37. The above video signal reproduction processing circuit 3
8, contrary to the operation of the video signal recording processing color 18,
The detected digital signals are rearranged according to a predetermined format depending on the system, and after data expansion and channel synthesis are performed, the digital signals are returned to analog signals. Here, the reproduction signal system identification circuit 48 uses the system identification signal 17 recorded on the magnetic tape 30 at the time of recording.
is restored from the signal detected by the magnetic head and output as a reproduction method identification signal 49.

Therefore, the video signal reproduction processing circuit 38 to which the extracted system identification signal 49 is supplied operates to perform reproduction signal processing in a predetermined format according to the system of the reproduced video signal. Then,
A good video signal excluding the synchronization signal is generated in the video signal reproduction processing circuit. Furthermore, the switching circuit 45 selectively switches the output synchronization signals from the synchronization signal generation circuits 43 and 44 that generate synchronization signals for the HDTV system and the NTSC system according to the supplied system identification signal 49, and outputs the selected signals to the mixing circuit 46. do.

Therefore, in the mixing circuit 46, the video signal excluding the synchronization signal and the synchronization signal of the same type as this signal are mixed, and a complete reproduced video signal is automatically obtained.

In addition, the switching circuit 47 uses the signal 62 to select the input selection signal 6 of the video signals from the input terminals 6 to 9 except during playback.
When the video signal selected in step 1 is reproduced, the output from the mixing circuit 46 is supplied to the output terminal 10. Also, the switching circuit 50
．． 51 switches and outputs the input signal according to each supplied system identification signal 49.17, so that video signals of the same system can be supplied to the output terminals 11, 12 corresponding to each system. Therefore, output terminal 11゜12
Since a video signal of a certain predetermined system is always automatically determined and supplied, there is an effect that a corresponding TV monitor can be connected to each output terminal 11, 12 and images can be received satisfactorily.

Further, the reproduced signal method display circuit 55 can display the method of the reproduced video signal according to the supplied method identification signal 49. During playback, the operation of the capstan motor, cylinder motor, and tape head running system during CTL signal playback must be controlled according to the NTSC system or HDTV system.
The magnetic heads 26 to 29 are set to one of the two methods.
The signal method identification circuit 48 is activated by the signal detected by the signal method identification circuit 48 to extract the method identification signal 49, and then the obtained signal 49 is used to operate the capstan motor 31. By controlling the operation of the cylinder 25 and the like in accordance with a predetermined method, a reproduced video signal of either method can be obtained automatically and satisfactorily. Note that the video signal reproduction processing circuit 3
8 will be described in more detail later using FIG.

Further, the operation settings of the device 1 are performed from the wireless remote controller 2 or the main body controller 57.
The operation of the device 1 is controlled by each control signal 59 to 62 and the like.

In the embodiment shown in FIG. 1, a plurality of synchronization signal generation circuits 43 and 44 are provided according to each method, but -
The effects of the present invention can still be obtained even if the operation of one of the synchronization signal generation circuits is changed according to the method identification signal 49 to generate a synchronization signal according to each method and supplied to the mixing circuit 46. It goes without saying that a similar result can be obtained (the configuration in this case corresponds to the dotted line portion 63 in FIG. 1).

FIG. 2 is a block diagram showing an example of the configuration of the video signal recording processing circuit in FIG. Compression circuit ■, 103 is a channel division circuit, 21° 22 is a recording modulation circuit, 105a is a clock generation circuit I, 105b is a clock generation circuit ■, 1
06 is a system identification signal input terminal, 107 is a changeover switch SWA, 108 is a changeover switch SWB, 109a
, 109b is a digital signal output terminal, and 110 is a horizontal blanking period removal circuit.

Further, FIG. 3 is an explanatory diagram of one specification of a recording signal in the video signal recording processing circuit shown in FIG. 2.

The operation of the video signal recording processing circuit will be explained below with reference to FIGS. 2 and 3.

Whether the input video signal is a band compression HDTV signal or NTSC
A system identification signal indicating whether the signal is a signal is sent from the system identification signal input terminal 106 to the SWA 107 and the channel division circuit 1.
03. When the input video signal is a band compression HDTV signal, the selector switch 5WA107 is connected to the terminal 1 side according to the system identification signal, and the clock generation circuit 11
05a and a signal path that does not undergo data compression.

Clock generation circuit 1105a generates a 16.2 MHz sampling clock corresponding to the band compressed HDTV signal. On the other hand, the band-compressed HDTV signal input from the analog video signal input terminal 100 is converted into 480 samples per image signal line by the A/D converter 19 according to the 16.2 MHz sampling clock supplied via the 5WA 107. converted into digital data.

The band-compressed HDTV signal converted into digital data by the A/D converter 19 is sent to a signal path that does not undergo data compression, and is also sent to the horizontal blanking period removal circuit 110 at the same time. The horizontal blanking period removal circuit 110 is a circuit that removes data during the horizontal blanking period that does not appear on the screen in order to reduce the signal recording density on the tape.
Since the DTV signal is already a signal with the information content of the HDTV signal compressed to 1/4, the horizontal blanking period removal circuit 110
The amount of data within each image signal line is not compressed by the switch SWA10 according to the system identification signal.
7, the A/D converter 1
The signal converted into digital data by 9 is directly input to the channel division circuit 103. That is, as shown in FIG. 3, in a band-compressed HDTV signal, all 480 samples of data per each image signal line are recorded. The channel division circuit 103 removes image signal line data during the vertical blanking period that does not appear on the screen, and divides the image data of each frame according to the number of segment divisions determined by the number of channel divisions and the number of cylinder rotations. and a recording modulation circuit 2L22 corresponding to each channel.
Output to. In this example, the number of channel divisions is 2ch and the cylinder rotation speed is 7200 rpm, so
The image data for each frame is divided into 16 segments. Further, the number of image signal lines recorded per frame was set to 1088, which is the total number of image signal lines per frame, 1125, excluding 37 lines during the vertical retrace period. Therefore, the number of data included in each segment obtained by dividing the image data in each frame into 16 is 1.The image data divided into each segment corresponds to each segment according to the recording order on the tape. The signal is sent to the recording modulation circuits 21 and 22 of the channel. The recording modulation circuits 21 and 22 modulate the input data for each segment in a manner suitable for recording and reproducing on the tape, and then send the data to a recording amplifier corresponding to each channel via digital signal output terminals 109a and 109b. Output data.

Next, the operation when recording an NTSC signal will be explained. A system identification signal is input from the input terminal 106 to the changeover switch SWA 107 and the channel division circuit 10.
The system identification signal added to 3 indicates that the input video signal is NTS.
This indicates that the changeover switch 5WA107 is connected to the connection terminal 2 side, and the clock generation circuit 11105b and the changeover switch SWB are connected to the connection terminal 2 side.
108 is selected. Clock generation circuit■
105b generates a sampling clock of 14.3 MHz, which is four times the frequency of the color subcarrier (rs.) of the NTSC signal, and passes through the changeover switch 5WA107 to the A/D converter 19, data compression circuit I 102a, It is added to the data compression circuit 1102b and the channel division circuit 103. The A/D converter 19 converts the NTSC signal input from the analog video signal input terminal 100 into 91 bits per image signal line as shown in FIG. 3 using the sampler clock supplied from the clock generation circuit n105b.
It is converted into digital data of 0 samples and sent to the horizontal blanking period removal circuit 110. The horizontal blanking period removal circuit 110 removes 133 samples corresponding to the horizontal blanking period from the 910 samples of data of each image signal line, and converts the 777 samples of the video signal period appearing on the screen into the data compression circuit 11.
02a, output to the data compression circuit II 102b and a signal path that does not perform data compression. Data compression circuit 1
The data compression circuit 102a and the data compression circuit 1102b compress the input data amount to 2/3 and 1/2, respectively, in order to reduce the signal recording density on the tape. The changeover switch 5WB108 is an NTSC signal recording mode ratio switch, and when connected to connection terminal 1, the data is not compressed, and when connected to connection terminal 2, the data is compressed to 2/3 by the data compression circuit 1102a. When connected to the connection terminal 3, data compressed to 1/2 by the data compression circuit 11102b is selected and sent to the channel division circuit 103 via the changeover switch 5WA10B. In addition, the changeover switch S
Simultaneously with the recording mode switching by W B 108, the cylinder rotation speed and tape running speed are switched. In this embodiment, as shown in FIG. 3, the cylinder rotation speed for each recording mode is 5400 rpm in the mode for recording uncompressed data;
In the mode for recording data compressed to 2/3 by
2700 in the mode that records data compressed to /2.
rpm, and the tape running speed for each recording mode is 3/4, 1/2, and 3/8, respectively, assuming that the tape running speed when recording a band-compressed HDTV signal is 1.
It is. The channel division circuit 103 removes image signal line data during the vertical retrace period that does not appear on the screen for each frame from the image data selected by the SWB 10B according to each recording mode, and The recording data in the (1) frame is divided according to the number of segment divisions determined by the data, and each segment is outputted to the recording modulation circuits 21 and 22 of the corresponding channels according to the recording order on the tape. In this embodiment, as shown in FIG. 3, the number of image signal lines recorded for each frame is 525, the total number of image signal lines per frame.
There are 504 trees excluding 21 trees during the vertical retrace period from the book. In addition, the number of channel divisions in this device is 2ch, and the cylinder rotation speed corresponding to each recording mode is 5400 rpm for the mode in which data compression is performed.
m, 3600 rpm for the mode that compresses data to 2/3 and records it, and 270 Orpm for the mode that compresses data to 1/2 and records it, so the number of divisions for dividing one frame of image data into segments. are 12 and 8, respectively, as shown in FIG. and 6 segments.

The channel division circuit 103 divides the recording data for each frame according to the number of segment divisions for each recording mode, and the recording modulation circuit 21 of the corresponding channel according to the recording order on the tape for each segment.゜2
Output to 2. Therefore, in each recording mode ζ, the number of pigs included in one segment is 32,634 for the mode that records without data compression, and for the mode that compresses and records data.
777 x 504 x ' - (-□) sample, 777
The number of data included in one segment can be made the same by switching the cylinder rotation speed corresponding to each recording mode. The recording modulation circuits 21 and 22 perform modulation suitable for recording and reproducing on a tape on the data divided into each segment by the channel division circuit 103 and output for each corresponding channel, and then output the data to a digital signal output terminal. Output from 109a and 109b.

As mentioned above, by switching the number of segments into which one frame of data is divided depending on the type of signal to be recorded and the compression or non-compression recording mode,
The number of data included in a segment is approximately the same as 32,640 samples when recording a band-compressed HDTV signal and 32,634 samples when recording an NTSC signal, so the recording density when recording on tape is also approximately the same. becomes. In addition, when recording an NTSC signal, insert 6 samples of dummy data into each segment so that the number of data included in one segment is the same as the number of data in one segment when recording a band-compressed HDTV signal, It is possible to keep the recording density on the tape constant regardless of the type of signal and the recording mode. Furthermore, in this case, 6 samples of data with a specific pattern corresponding to each recording mode are inserted during recording, and during playback, the 6 samples of data inserted during recording are detected from the playback signal, and the cylinder is rotated according to the pattern. By setting the number and tape running speed, it is possible to automatically determine the recording mode. In addition, the synchronization signal pattern inserted into the data recorded on each signal recording track to synchronize the playback signal processing during playback is a signal with a specific pattern depending on the type of recording signal and recording mode. Sometimes, by setting the cylinder rotation speed and tape running speed to predetermined values according to the detected synchronization signal pattern, or by setting the data to be recorded in the preamplifier part of the signal recording track on the tape according to the type of recording signal and recording mode. By detecting the data pattern of the reproduced preamble part and setting the cylinder rotation speed and tape running speed to predetermined values,
It is possible to automatically determine the type of recording signal and recording mode during playback.

FIG. 4 is a block diagram showing an example of the configuration of the video signal reproduction processing circuit in FIG. 1, 121a.

121b is a digital signal input terminal, 39.40 is a reproduction demodulation circuit, 124a and 124b are data output terminals for signal system identification, 123 is a channel synthesis circuit, 125 is a signal system identification signal input terminal, 126 is a data expansion circuit I;
7 is a data expansion circuit, 128 is a horizontal blanking period insertion circuit, 129 is a changeover switch 5WC1130 is a vertical blanking period insertion circuit, 131 is an NTSC vertical blanking period data generation circuit, 132 is band compression HDTV vertical blanking period data A generating circuit, 42 a D/A converter, and 133 an analog signal output terminal.

Hereinafter, signal processing during signal reproduction will be explained with reference to the same figure.

The two-channel signals reproduced from the tape pass through a reproduction amplifier for each channel and are then input to the digital signal input terminal 121.
a, 121b to the regenerative demodulation circuit 39°40. The reproduction demodulation circuits 39 and 40 demodulate the signal modulated during recording, generate a clock synchronized with the data from the reproduction signal sequence, and send it to each circuit, as well as discriminate the 6 samples inserted for each segment during recording. data, a synchronizing signal for synchronizing playback data and signal processing, or data recorded in a preamble portion on the tape is extracted and output to a data output terminal 124a.

124b. The data demodulated by the reproducing demodulation circuits 39 and 40 is sent to the channel combining circuit 123. On the other hand, the signal system identification signal having information on the result determined by the signal system identification data is transmitted to the system identification signal input terminal 1.
25 and applied to the channel combining circuit 123 and changeover switch 5WC129. If the data reproduced from the tape is identified as an NTSC signal recorded without data compression, one frame of data is divided into 12 segments, so the channel synthesis circuit 123 sequentially inputs data from each channel. The data is combined into one frame of data every 12 segments and output. At the same time, changeover switch 5WC129 is connected to terminal 2 and selects a path in which data is not expanded, a path passing through horizontal blanking period insertion circuit 128, and NTSC vertical line period data generation circuit 131. Therefore, the signal synthesized into a data string for each frame by the channel synthesis circuit 123 is input to the horizontal retrace period insertion circuit 128.

The horizontal blanking period insertion circuit 128 inserts 133 samples of horizontal blanking period data removed during recording into a predetermined position,
Reconstruct the data of each image signal line. The data string reconstructed by the horizontal blanking period insertion circuit 128 is input to the vertical blanking period insertion circuit 130. On the other hand, the NTSC vertical blanking period data generation circuit 131 generates data of 21 image signal lines during the vertical blanking period that are removed during recording, and outputs it to the vertical blanking period insertion circuit 130. The vertical blanking period insertion circuit 130 inserts the data string inputted from the NTSC vertical blanking period data generation circuit 131 into a predetermined position of the data string inputted from the horizontal blanking period insertion circuit 128, and outputs the data string inputted from the NTSC vertical blanking period data generation circuit 131 to the D/A converter 42. Output to. The D/A converter 42 converts a digital signal configured into a digital string of safe NTSC signals into an analog signal, and outputs the analog signal from an analog signal output terminal 133.

Furthermore, if the signal played back from the tape is identified as a signal obtained by compressing NTSC data to 2/3 during recording, the channel synthesis circuit 123 uses the 8 segments sequentially input from each channel according to the system identification signal. 1 for each data
In addition to combining and outputting the data string of the frame, the SWC
129 is connected to terminal 3 and selects data expansion circuit 1126.

The data decompression circuit 1126 decompresses the signal data compressed to 2/3 during recording into the original data string.

Therefore, the signal synthesized into one frame of data string by the channel synthesis circuit 123 is expanded into the original data string by the data expansion circuit 1126, and thereafter, the horizontal blanking period insertion circuit 128 and the vertical blanking period insertion circuit 130 After inserting the data string removed during recording, the D/A
The signal is converted into an analog signal by the converter 42 and output from the analog signal output terminal 133. In addition, if the signal reproduced from the tape is identified as a signal obtained by compressing the data to 1/2 of the NTSC signal during recording, the channel synthesis circuit 123 uses the 6 segments that are sequentially input from each channel according to the system identification signal. The data of each frame are combined into one frame of data string, outputted, and the changeover switch SW
C129 is connected to terminal 4, and data expansion circuit ■127
Select.

The data expansion circuit 127 doubles the signal whose data was compressed to 1/2 during recording, and restores it to the original data string.

Therefore, the signal synthesized into one frame of data string by the channel synthesis circuit 123 is expanded into the original data string by the data expansion circuit 127, and after that, the data removed during recording is inserted in the same way. It is converted into an analog signal and output from the analog signal output terminal 133.

On the other hand, if the reproduced signal is identified as a band compression HDTV signal, the channel combining circuit 13
3 is a signal path in which 16 segments of data sequentially input from each channel are combined into one frame data string and output, and at the same time, a changeover switch SWC129 is connected to terminal 1, and does not perform data expansion or horizontal blanking period insertion. and band compression HDTV vertical blanking period data generation circuit 1
Select 32.

For band-compressed HDTV signals, data is not removed within each image signal line during recording, so the signal synthesized into one frame of data string by the channel synthesis circuit 123 is input to the vertical blanking period insertion circuit 130. be done.

On the other hand, band compression HDTV vertical blanking period data generation circuit 1
32 is a vertical blanking period insertion circuit 1 which generates data of 37 image signal lines during the vertical blanking period removed during recording;
Enter 30. The vertical blanking period insertion circuit 130 inserts the band compression HDTV vertical blanking period data generation circuit 132 into a predetermined position of the data string synthesized by the channel combining circuit 123.
The generated data is inserted, restored into a data string of a complete band-compressed HDTV signal, and then output. D/A converter 4
2 converts the data string of the band-compressed HDTV signal restored by the vertical blanking period insertion circuit 130 into an analog signal, converts it into an analog signal, and outputs it from the analog signal output terminal 133.

FIG. 5 is a block diagram showing a configuration example of the signal system identification circuit in FIG. 1, in which 301 is a clamp circuit, 302
303 is a comparison circuit, 303 is a reference voltage source, 304 is a synchronization signal separation circuit, β05 is an NTSC synchronization signal generation circuit, 30
6 is a synchronization signal comparison and determination circuit.

Further, FIG. 6 is a signal waveform diagram illustrating the operation of FIG. 5.

The operation shown in FIG. 5 will be explained below with reference to FIG. 6.

Now, assume that the NTSC video signal is selected by the input selection control signal 61 shown in FIG. The video signal output from the switching circuit 15 is sent to the clamp circuit 301 as shown in FIG. 6(a).
The reference voltage source 30 is adjusted based on the DC level shown by the dotted line 307 shown in FIG.
3 and the output video signal from the clamp circuit 302, and a synchronization signal of the input video signal is output from the comparison circuit 302 as shown in FIG. 6(b). That is, a synchronization signal separation circuit 30 for an NTSC video signal is generated by a clamp circuit 301, a comparison circuit 302, and a reference voltage source 303.
4.

Furthermore, the NTSC system generates the reference synchronization signal of the NTSC system.
Both outputs of the C-scheme synchronization signal generation circuit 305 and the comparison circuit 302 are supplied to a synchronization signal comparison and determination circuit 306, and in this determination circuit 306, the output signal from the comparison circuit 302 is
By determining whether the synchronization signal is of the TSC system or not, it is possible to automatically discriminate between the NTSC system and the HDTV system for the video signal to be recorded, and a system identification signal 17 is generated.

In other words, when an HDTV video signal as shown in FIG. 6(c) is supplied to the signal system identification circuit 16, the signal after passing through the synchronization signal separation circuit 304 is as shown in FIG. 6(d). A signal that is completely different from the reference synchronization signal of the NTSC system is generated, so that comparison and determination of the synchronization signals can be performed without any problem.

Conversely, it is also possible to generate a synchronization signal for the HDTV system as a reference signal and compare this signal with the signal obtained by supplying the input video signal to the synchronization signal separation circuit for the HDTV system. In this case, it is easier to configure the system by operating it in the form of a digital signal rather than an analog signal.

In the embodiment shown in FIG. 1, the signal system identification circuit 16 generates the system identification signal 17 in response to the output video signal from the switching circuit 15, but the system identification signal 17 is generated in response to the input selection control signal 61 from the system controller 58. It goes without saying that even if the system identification signal 17 is generated, the same effect as in the embodiment shown in FIG. 1 can be obtained. This embodiment will be explained with reference to FIG.

FIG. 7 is a block diagram showing another embodiment of the present invention, in which 201 is a signal system identification circuit, 203 is a comparison and discrimination circuit,
205 is a warning display circuit, and the same reference numerals as in FIG. 1 correspond to the same parts.

In the figure, video signals from a baseband video signal input terminal 8.9 and a tuner 13, 14, each having a determined video signal format, are selectively switched by a switching circuit 15 in accordance with a manual selection control signal 61. Extracted. On the other hand, the power type identification signal 17 is generated in accordance with the control signal 61 supplied by the signal type identification circuit 201, and as in the embodiment shown in FIG. This will be obtained. By the way, also in this case, the signal system identification circuit 16 is provided, and the system identification signal 202 generated by the signal system identification circuit 16 and the control signal 61 are
are compared and determined by the comparison and determination circuit 203, and both signals 202
．． A control signal 20 indicating whether the methods indicated by 61 are the same or different.
Generate 4.

If the systems indicated by the two signals 202.61 are different, the control signal 204 causes the warning display circuit 205 to display a warning to the user, or controls the operation of the main body 1 of the apparatus to prohibit the recording operation. By doing so, it is possible to realize a device with good operability for the user.

As a method for recording and reproducing the system identification signal on the magnetic tape, in the above embodiment, an example was shown in which diagonal recording tracks are used by the rotating magnetic heads 26 to 29, but it is also possible to use oblique recording tracks by fixed heads. good. For example, the system identification signal 17 is recorded by the CTL head 32 via the CTL signal control circuit 35, and during playback, the CTL head 32
The signal detected in step 5 can be supplied to the method identification circuit 48 via the CTL signal control circuit 35 to obtain the method identification signal 49. In this case, the method identification signal 49 can be obtained without operating the cylinder motor control during reproduction. 49 can be extracted, it is possible to realize a system identification signal extraction operation with higher accuracy with a simple configuration.

FIG. 8 is a block diagram showing an example of the configuration of a cylinder motor control circuit, in which 301 is a tack magnet, 302 is a tack head, 303 is an amplifier, 304 is a delay multiplier, 3
05 is a cylinder servo, 306 is a motor driver, 30
7 is an identification signal input terminal, 308 is a head switching signal output terminal, and 309 is a cylinder motor, and the same reference numerals as in FIG. 1 correspond to the same parts.

Further, FIG. 9 is an operational waveform diagram of FIG. 8.

In FIG. 8, magnetic heads 26 and 28 and magnetic heads 27 and 29 are arranged close to each other on cylinder 25, and the input video signal is transmitted to magnetic heads 26, 28, magnetic heads 27, 29, It is divided into two channels for recording and playback.

Further, a tack magnet 301 is attached to the cylinder 25, which is detected by a tack head 302 and supplied to a delay multi-circuit 304 via a tack amplifier 303. The tack pulse signal P (I-p4 in FIG. 9) amplified by the tack amplifier 303 is a signal synchronized with the cylinder 25, and one pulse is output for one rotation of the cylinder.

The period τp (Tpl to τp4) of the tack pulse P shown in FIG. is magnetic tape 3
The time it takes to start scanning above 0 also differs depending on the cylinder rotation speed.

Therefore, the identification output VR from the signal system identification circuit 16 inputted through the terminal 307 is, for example, NTSC data compression shown in the table of FIG.
Orpm receives a pulse signal Q (first pulse signal) from the delay multi-circuit 304 having a width τ1 corresponding to the time from when the previous tack pulse is detected until the magnetic head starts scanning in synchronization with the rising edge of the tack pulse P. q+) in Figure 9 is output, and the identification output
4 to the time τ2(-
□When the pulse signal Q (q2 in Fig. 9) with a width of τ1) is output, and when the identification output ■8 is NTSC non-data compression (cylinder rotation speed 5tOOrpm), the delay multi-circuit 30
4 to the time τ3(-
A pulse signal Q (Q3 in Fig. 9) with a width of □τI) is output, and when the identification output ∎8 is a band compression HDTV (cylinder rotation speed 720 Orpm), the pulse signal Q (Q3 in Fig. 9) is output from the delay multi-circuit 304 in synchronization with the rise of the tack pulse P. time τ4(−□τI
) (Q4 in FIG. 9) is output.

The output signal Q from this delay multi-circuit 304 is supplied to a cylinder servo circuit 305. The cylinder servo circuit 305 is supplied with an identification output (■8) via a terminal 307. This identification output VR determines the cylinder rotation speed and performs speed control, and the output signal Q from the delay multi-circuit 304 determines the cylinder rotation speed. Phase control is performed,
This control output is supplied to the motor driver 306 to rotate the cylinder motor 309 at a predetermined speed and phase.

At the same time, the cylinder servo circuit 305 outputs a pulse signal R (r1, r2, r3, or r4 in FIG. 9) having a duty ratio of 50% in synchronization with the fall of the output signal Q from the delay multicircuit 304. The low level period of this pulse signal R is a period during which the magnetic head 27.29 scans the magnetic tape 30, and the high level period is a period during which the magnetic head 26.28 scans the magnetic tape 30. Signal R is supplied to the video processing circuit via terminal 308 as a head switching signal.

The above-mentioned delay multi-circuit 304 outputs a pulse signal Q having a different pulse width depending on the identification signal (1) supplied through the terminal 307, and the time τ1. τ2. τ3. τ
It may consist of four delay multi-circuits that output pulse signals of 4, and each output signal may be switched by identification signal It may be configured such that the counter is reset by the counter output, and the initial setting value or clock of the counter is switched by the identification signal 8.

In the above embodiments, the input video signal is NT
Although we have explained two types of cases, the SC system and the band-compressed HD TV system, it is also possible to record and play back video signals of more systems, or to use other systems (for example, P
It is clear that the effects of the present invention can be obtained with a similar configuration even for signals of AL system, MAC system, and even audio-only signals.

(Effects of the Invention) As explained above, according to the present invention, video signals of a plurality of formats can be recorded and played back satisfactorily with one digital recording and playback device, thereby greatly improving operability for the user. In addition, it is possible to realize high-quality, long-time recording and playback with good economic efficiency, and it is possible to provide a digital recording and playback device that has excellent functions while eliminating the drawbacks of the above-mentioned prior art.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing an example of the configuration of the video signal recording processing circuit shown in FIG. 1, and FIG. 3 is the video signal recording processing circuit shown in FIG. 2. 4 is a block diagram showing a configuration example of the video signal reproduction processing circuit in FIG. 1, and FIG. 5 is a block diagram showing a configuration example of the signal system identification circuit in FIG. 1. , FIG. 6 is a signal waveform diagram explaining the operation of FIG. 5, FIG. 7 is a block diagram showing another embodiment of the present invention, FIG. 8 is a block diagram showing an example of the configuration of a cylinder motor control circuit, Figure 9 is the operation waveform diagram of Figure 8, Figure 10, and Figure 1.
FIG. 1 is an explanatory diagram of the specifications of the signal system. 6-9... Input terminal, 10-12...
...Output terminal, 15, 45, 47.50-53
......Switching circuit, 18...
Video signal recording processing circuit, 16°48...
Signal system identification circuit, 17... Recording system identification signal, 49... Playback system identification signal, 46... Mixing circuit, 38...
...Video signal reproduction processing circuit, 43.44...
...Synchronization signal generation circuit.

Claims (1)

[Claims] 1. A recording means for converting a plurality of video signals of different formats into digital signals and recording them on a recording medium, and converting the video signals of different formats recorded on the recording medium into digital signals corresponding to each of the video signals. Accordingly, in a digital recording and reproducing apparatus comprising a reproducing means for reproducing, a reproduced video signal method identifying means for identifying a method of a reproduced video signal according to a signal detected from the recording medium; a synchronizing signal generating means for generating a synchronizing signal of the identified method according to the output signal of the synchronizing signal; and a mixing means for mixing the synchronizing signal outputted from the synchronizing signal generating means and the video signal reproduced from the recording medium. A digital recording/reproducing device characterized by comprising: 2. In the digital recording and reproducing apparatus according to claim 1, the recording means includes recorded video signal system identification means for identifying the system of the supplied video signal;
Video signal recording processing means that converts the supplied video signal into a digital signal, performs recording signal processing in accordance with the format identified by the recorded video signal identification means, and outputs a recorded digital signal. and system identification signal recording means for recording the output signal of the recorded video signal system identification means on the recording medium, and the video signal for processing the recording signal according to the format of the identification signal identified by the recording video signal system identification means. A digital recording/reproducing apparatus characterized in that the output of the signal recording processing means and the identification signal are recorded on the recording medium. 3. The digital recording and reproducing apparatus according to claim 1 or 2, which includes a plurality of output terminals corresponding to a plurality of video signal formats, and a signal supplied from the mixing means to each of the output terminals. 1. A digital recording and reproducing apparatus, comprising a switching means for switching and outputting a signal in accordance with the reproduction video signal system identification means, and configured to control said switching means in accordance with an output signal from said reproduced video signal system identification means. 4. The digital recording and reproducing apparatus according to claim 1 or 2, comprising a rotational phase detection means for detecting the rotational phase of a rotating body on which a magnetic head is mounted, and an output of the rotational phase detection means. switching signal generation means for generating a switching signal for the magnetic head with a delay, the amount of delay in generating the switching signal for the magnetic head according to the output of the reproduced video signal system identification means or the recorded video signal system identification means; A digital recording and reproducing device characterized in that it is configured to control.