JP3111822B2 - Information recording device and information recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the information recording of current analog information services and next-generation digital information services.
The present invention relates to a recording / playback apparatus .

[0002]

2. Description of the Related Art At present, so-called analog video information services such as pay broadcasting (for example, WOWOW) using a broadcasting satellite and CATV (cable television) are provided. In addition, various signal processing devices (decoders, video tape recorders (VTRs), monitors) corresponding to such services are already on the market.

[0003] On the other hand, various new digital information services have been proposed (Nikkei Communication, 199) by increasing the speed of digital signal processing and improving image compression techniques.
See 3.8.2, “The United States Enters the Practical Stage on the Multimedia Continent”). As a new information service, VOD (Video On Demand) and the like for increasing the number of channels using an image compression technique and distributing a program in response to a user's request are being considered. This new information service cannot be handled by conventional decoders. Therefore, a person who wants to receive both services needs to purchase a decoder for a new service in addition to the conventional decoder, which increases the economic burden. Therefore, a decoder that can handle new services as well as existing services is desirable,
Conventionally, there is no such decoder.

[0004] On the other hand, VTRs used for recording and reproducing information signals such as color video signals are now widely used in homes. The home VTR is a so-called analog recording system (VHS or the like). On the other hand, in the broadcasting business, a digital recording VTR has entered a practical stage. As a digital recording VTR for broadcasting business,
There are D1, D2, and D3 formats, which are currently used by broadcast stations. The technology of such a broadcast business VTR is
It is expected that it will be used in home VTRs. In addition, a VTR corresponding to the new digital information service as described above is naturally required. in this case,
It is considered that a digital recording system is suitable for recording the compressed signal. Considering the above points, the next-generation home VTR will be a digital recording system.
However, the user needs to purchase a new digital VTR in addition to the conventional analog VTR, which increases the economic burden. Therefore, it is sufficient if there is a VTR capable of performing the above-described conventional analog recording / reproducing and digital recording / reproducing corresponding to the digital information service.
Conventionally, there is no such VTR.

At present, it is difficult to say that copyrights for software are sufficiently protected. For example, if a currently paid program is once recorded on a VTR, the program can be freely viewed later. Current home VTRs use the analog recording system, and dubbing inevitably causes image quality degradation. In particular,
With the digital recording system, dubbing can be performed without deterioration, so that copyright protection is more problematic than ever.

[0006] In addition, since the current billing system pays a fixed fee on a monthly basis, it is actually unrelated to the actual use situation.

[0007]

As mentioned above, a new digital information service using digital technology is about to begin. This new service cannot be received by the conventional analog decoder and the conventional V
Recording and reproduction cannot be performed with TR. Therefore, the user needs to purchase a new device corresponding to the digital service, which increases the economic burden.

An object of the present invention, in addition to the conventional information service, to provide a corresponding possible information recording equipment Contact and information recording and reproducing apparatus even one in the new digital service.

[0009]

According to the present invention, a signal processing circuit for digital information service is provided in addition to a conventional signal processing circuit for analog information service. In recording / reproducing a digital information service, a signal before decoding is recorded.

[0010]

The signal processing apparatus according to the present invention includes a new signal processing circuit for digital information services in addition to the conventional signal processing circuit for information services, so that one apparatus can support both services. .

[0011]

FIG. 1 shows an embodiment of the present invention. In FIG. 1, 1 is an input terminal for a TV broadcast signal, 2 is an input terminal for an information service signal, 10 is a terminal for descrambling the information service signal, etc., 20 is a tuner, 30 is an analog information signal decoder, and 40 is Decoders for digital information signals, 50 and 55 are selection circuits, 60 is a recording element for billing information, 100 is a recording / reproducing device for the information signal, 110 is an analog signal processing circuit, 120 is a digital signal processing circuit, and 130 and 135 are selection circuits. Circuit, 140 is a cylinder, 1
50 is a magnetic tape, 160 and 161 are magnetic heads for recording analog signals, 170 to 173 are magnetic heads for recording digital signals, and 180 is a monitor.

First, a TV broadcast signal (current NTSC signal)
The case will be described. T input from input terminal 1
The V signal is the same as the conventional one. The input TV signal is sent to the monitor 180 and the information recording / reproducing device 100. The TV signal can be viewed on the monitor 180, and can be recorded and reproduced by the information recording / reproducing apparatus 100. Although the operation of the information recording / reproducing apparatus 100 will be described in detail later, basically, a TV signal input to the information recording / reproducing apparatus 100 is sent to an analog signal processing circuit 110, where a predetermined recording signal processing is performed. . Here, the predetermined recording signal processing is, for example, in this embodiment, the VH of the home VTR.
The S method is used. That is, the input signal is a luminance signal,
The color signal is separated into color signals, and the color signal that has been frequency-converted to a low frequency is superimposed on the FM-modulated luminance signal. The signal subjected to the recording signal processing is sent to the analog signal recording magnetic heads 160 and 161 via the selection circuit 130, and is recorded on the magnetic tape 150. At the time of reproduction, a signal reproduced from the magnetic tape 150 by the magnetic heads 160 and 161 for recording analog signals is supplied to the analog signal processing circuit 11 via the selection circuit 135.
Input to 0. The analog signal processing circuit 110 performs predetermined reproduction signal processing, and outputs the signal from the recording / reproduction device 100. Here, the predetermined reproduction signal processing is a VHS system of a home VTR in this embodiment. That is, the reproduced signal is subjected to FM demodulation, and then a luminance signal and a chrominance signal are combined and output in the form of a TV signal. The output signal is sent to the monitor 180 and can be viewed on the monitor.

Next, the case of the analog information service will be described. This is a paid satellite broadcast, cable TV (CATV), or the like that is currently being performed. The current analog information signal is usually scrambled so that the contents cannot be viewed on a monitor unless a decoder is used. The analog information signal input from the input terminal 2 is sent to the terminal 10. As for the analog information signal input to the terminal 10, the signal of the channel selected by the user is selected through the tuner 20, and is input to the analog information signal decoder 30.

FIG. 2 shows an example of the configuration of the analog information signal decoder 30. As shown in FIG. 2, reference numeral 200 denotes an input terminal of the analog information signal decoder 30; 210, a descrambler for descrambling the scrambled analog information signal; and 220, a TV capable of displaying the descrambled signal on a monitor 180. An image processing circuit for converting signals, 230 is a decoder usage check circuit, 235 is a billing information output terminal, and 205 is an output terminal of the analog information signal decoder 30. Input terminal 200
Are descrambled by the descrambler 210 and sent to the video processing circuit 220. The video processing circuit 220 prepares a synchronizing signal or the like so that the image can be displayed on the monitor 180, and is output from the analog information signal decoder 30 via the output terminal 205.

The descrambled analog information signal converted into a video signal is sent to a selection circuit 55. Here, when the analog information signal is selected by the user, the selection circuit 55 switches so that the output of the analog information signal decoder 30 becomes the output of the terminal 10. The video signal output from the terminal 10 is
80 and sent to the recording / reproducing device 100. The analog information signal can be viewed on the monitor 180, and can be recorded and reproduced by the information recording / reproducing apparatus 100. The decoder usage check circuit 230 checks the usage of the analog information signal decoder 30 and sends the information to the charging information recording element 60 of the terminal 10 via the charging information output terminal 235. As an example of the checking method, when a decoder is used, one pulse signal is output per unit time, and it is possible to know the used amount by counting the pulse signals. The method of checking the used amount is not limited to this method, and the present invention is effective even with another method.

Here, recording and reproduction of a TV broadcast signal and a decoded analog information signal input to the information recording and reproducing apparatus 100 will be described. The signal input to the information recording / reproducing apparatus 100 is sent to an analog signal processing circuit 110, where a predetermined recording signal processing is performed. The recording method of the present embodiment is, for example, a method used in a home VTR (VHS method). That is, the TV signal is separated into a luminance signal and a chrominance signal, the luminance signal is FM-modulated, the color signal is frequency-converted to a low frequency band, and then superimposed and recorded on the FM-modulated luminance signal. The signal subjected to the recording signal processing is sent to the analog signal recording magnetic heads 160 and 161 via the selection circuit 130, and is recorded on the magnetic tape 150. Magnetic heads 160 and 16 for recording analog signals
It is assumed that 1 is arranged 180 ° opposite to each other as an example. Magnetic tape 150 is 180 ° on cylinder 140
The cylinder 140 and the magnetic tape 150 are controlled to a predetermined cylinder rotation speed and a predetermined tape feed speed by a servo control circuit (not shown in FIG. 1). At the time of reproduction, signals reproduced by the analog signal recording magnetic heads 160 and 161 from the magnetic tape 150 are transmitted to the analog signal processing circuit 1 via the selection circuit 135.
10 is input. The reproduction signal is subjected to predetermined reproduction signal processing by the analog signal processing circuit 110. Basically,
The reverse signal processing is performed during recording. That is, the reproduction signal is separated into a luminance signal and a chrominance signal, and the luminance signal is FM-demodulated.
The color signal is frequency-converted. The above-described frequency-converted color signal is superimposed on the FM-demodulated luminance signal, and the information recording / reproducing apparatus 1
Output from 00. The output signal is output to the monitor 18
0 and can be viewed on the monitor.

Here, the information recording / reproducing apparatus 100
The configuration and circuit operation of the analog signal processing circuit 110 will be described. FIG. 3 shows a configuration example of the analog signal processing circuit 110. 3, reference numeral 300 denotes a TV broadcast signal input terminal of the analog signal processing circuit 110, 301 denotes a TV signal input terminal of the analog signal processing circuit 110, 3030 denotes a selection circuit, and 310 denotes a Y / C for separating a luminance signal and a chrominance signal.
A separation circuit, 320 is an FM modulation circuit, 330 is a frequency conversion circuit, 340 is a synthesis circuit, 305 is a recording signal output terminal of the analog signal processing circuit 110, 350 is a reproduction signal input terminal of the analog signal processing circuit 110, and 360 is equalization. circuit,
365 is a separation circuit composed of a filter or the like, and 370 is F
An M demodulation circuit, 380 is a frequency conversion circuit, 390 is a synthesis circuit, and 355 is a reproduction signal output terminal of the analog signal processing circuit 110.

A video signal input from the input terminal 300 or 301 is sent to a selection circuit 303, and a signal to be recorded is selected by a user. The selected signal is Y / C
Separation circuit 310 separates the signal into a luminance signal and a chrominance signal. Thereafter, the luminance signal is FM-modulated by the FM modulation circuit 320 and sent to the synthesis circuit 340. On the other hand, the color signal is frequency-converted to a low frequency by the frequency conversion circuit 330 and sent to the synthesizing circuit 340. The synthesizing circuit 340 synthesizes the FM-modulated luminance signal and the low-frequency-converted color signal, and records them on the magnetic tape 150 from the recording signal output terminal 305 via the magnetic heads 160 and 161.

At the time of reproduction, first, a reproduction signal input terminal 350
The signal input from is equalized by the equalizing circuit 360. The waveform-equalized reproduction signal is separated into a luminance signal and a chrominance signal by a separation circuit 365, and the luminance signal is FM-demodulated. The color signal is processed by the frequency conversion circuit 380 in a process reverse to that at the time of recording, and is returned to the original frequency. Synthesis circuit 3
At 90, the FM-demodulated luminance signal and the frequency-converted color signal are combined, and the reproduced output terminal 35 is output as a TV signal.
5 is output.

Next, the case of a digital information signal will be described. First, consider a signal as shown in FIG. 4 as an example of an input digital information signal. The digital information signal in this example is an example of a video service using an image compression technique. In FIG. 4, (1) shows the information amount of the original signal. For example, MPEG (Mov) which is an image compression technique using DCT (Discrete Cosine Transform)
ing Picture Experts Grou
Using p), the amount of information can be compressed. In the present embodiment, for example, the programs α, β, γ, and δ are image-compressed to about one-fourth the information amount (shown in FIGS. 4 (2) to (5)).
As a result, a transmission path having a capacity of one program can be used as shown in FIG.
As shown in (6), four compressed signals can be time-division multiplexed and transmitted. If there are four available frequencies,
Conventionally, only four programs could be transmitted. However, if the above-mentioned image compression technique is applied, the above example has the same 4
It is possible to transmit 4 × 4 = 16 programs at one frequency and to achieve multi-channel. Generally, when the compression ratio is 1 / N, N programs can be transmitted on the same channel.

The digital information signal input from the input terminal 2 is sent to the tuner 20 and one channel or at least one program is selected by the user.
The output of the tuner 20 is sent to the selection circuit 50 and the digital input terminal of the information recording / reproducing device 100. Selection circuit 5
0, the output of the tuner 20 and the information recording / reproducing device 1
00 digital reproduction signal is input. Selection circuit 50
Is switched so that the output of the tuner 20 is selected when the transmitted signal is viewed, and the output of the information recording / reproducing apparatus 100 is selected when the reproduced signal of the information recording / reproducing apparatus 100 is viewed. Digital recording and reproduction of the information recording and reproducing apparatus 100 will be described later in detail. The signal appropriately selected by the selection circuit 50 is transmitted to the digital information signal decoder 4.
Input to 0.

In the present invention, digital input / output of the digital information signal decoder 40 and the information recording / reproducing apparatus 100 is performed before the digital information signal is decoded. As a result, it is possible to realize the protection of the copyright of the software and the billing system only for the actual viewing. Hereinafter, this point will be described. In digital recording, repeated dubbing does not cause deterioration unlike analog recording. for that reason,
Once recorded software may be dubbed any number of times without deterioration, copyright protection becomes a major issue. Therefore, in the present invention, the digital information signal is input and output between the terminal and the recording / reproducing apparatus in a state before decoding, that is, in a state where the image is compressed. Since the digital information signal before decoding has been subjected to image compression processing, even if it is digitally recorded, the content of the signal reproduced and output cannot be viewed as it is. Therefore, digital dubbing is possible, but it is impossible to see the content as it is. In other words, in order to see the contents of the software, it is necessary to pass a digitally recorded signal or a broadcasted signal through a decoder. Therefore, the billing method of the present invention
It is a method of charging each time a decoder is used. According to this method, it is possible to charge only when the user actually watches the software, and it is possible to prevent the user from being charged even if the user does not watch the software on a monthly basis as in the related art. In addition, even in the case of digital recording, a decoder is necessary to view the contents in order to record and reproduce the data in a compressed state. This will be described in detail later. It will surely protect you.

Here, the digital information signal decoder 4
FIG. 5 shows an example of the configuration of the “0”. 5, reference numeral 500 denotes an input terminal of the digital information signal decoder 40; 510, a digital demodulation circuit; 520, an error correction circuit; 530, a descrambler for descrambling; 550, a video processing circuit; 560, a decoder usage check circuit;
5 is a billing information output terminal, and 505 is an output terminal of the digital information signal decoder 40. The digital information signal input via the input terminal 500 is subjected to a predetermined demodulation processing by a digital demodulation circuit 510, and then to an error correction circuit 52.
Sent to 0. The error correction circuit 520 corrects an error generated during transmission by using an error correction code added during transmission. The error-corrected signal is descrambled by the descrambler 520, and
Input to 40. In the image decompression circuit 540, an image decompression process for restoring the image-compressed signal to the original state is performed.
EG decoding is performed. The signal decompressed by the image decompression circuit 540 is added to a necessary synchronizing signal and the like by the video processing circuit 550 and adjusted to a TV signal form. The digital information signal in the form of a TV signal is output from the video processing circuit 550 via the output terminal 505. The decoder usage check circuit 560 checks the usage of the digital information signal decoder 40 and outputs the information via the charging information output terminal 565 to the charging information recording element 6 of the terminal 10.
Send to 0. As an example of the checking method, when a decoder is used, one pulse signal is output per unit time, and it is possible to know the used amount by counting the pulse signals. The method of checking the used amount is not limited to this method, and the present invention is effective even with another method.

Decoding is performed as described above, and the TV
The digital information signal converted into the signal form is input to the selection circuit 55. Here, when the digital information signal is selected by the user, the selection circuit 55 switches so that the output of the digital information signal decoder 40 becomes the output of the terminal 10. The signal output from the terminal 10 is sent to the monitor 180 and the information recording / reproducing device 100. On the monitor 180, the digital information signal decoded and converted into a TV signal can be viewed, and the information recording / reproducing apparatus 100 can perform analog recording and reproduction. The analog recording / reproducing operation of the information recording / reproducing apparatus 100 has already been described in the case of the analog information signal, and thus will not be described here.

Next, the charging method of the present invention will be described. In the present invention, the decoder usage check circuit checks the usage of the decoder. 2, a charging information output terminal 235 outputs an analog information signal decoder 3
A signal indicating the usage amount of 0 is output. In FIG. 5, a signal indicating the usage amount of the digital information signal decoder 40 is output from the charging information output terminal 565. The output from the charging information output terminals 235 and 565 is
The charge amount is sent to the accounting information recording element 60 of 0 and the usage amount is integrated. The billing information recording element 60 may be a removable one such as a nonvolatile memory or an IC card. Based on the information recorded in the charging information recording element 60, if a system is used in which the usage is checked and charged on a monthly basis, for example, it is possible to charge only for the actual use of the decoder. The charging information recording element 60 is replaced with an IC
If a card such as a removable card is used, charging the user can be performed by inserting the user's IC card when borrowing another person's decoder.
If the digital information signal decoder does not operate without the charging information recording element 60, unauthorized use of the decoder can be prevented, and a user-friendly charging system can be realized. A method is also conceivable in which an element, such as a prepaid card, in which a decoder usable amount is recorded in advance, and a subtraction is performed according to the use of the decoder.

According to this method, a certain limit can be imposed on the amount of use of the decoder. As described above, with a system that charges for the amount of use of the decoder, it is possible to reliably charge for the amount actually used.

In the case where both analog and digital information signals are decoded and then analog recording is performed, billing can be performed only at the first decoding. However, in the case of analog recording, image quality deterioration cannot be avoided. The digital recording and reproduction of the reproduction device 100 will be described. The digital information signal input to the information recording / reproducing apparatus 100 is
And a predetermined recording signal processing is performed. Although the configuration and signal processing of the digital signal processing circuit 120 will be described later in detail, basically, the input signal is subjected to recording signal processing such as channel division, addition of an error correction code, and digital modulation.

The signal subjected to the predetermined recording signal processing is sent to the selection circuit 130. The selection circuit 130 switches so as to select the output after the recording signal processing from the digital signal processing circuit 120 at the time of recording the digital information signal. The selected signal is supplied to the digital signal recording magnetic heads 170 to 173 and recorded on the magnetic tape 150. Digital signal recording magnetic heads 170-1
It is assumed that the reference numerals 73 are arranged 180 ° opposite to each other as an example. The magnetic tape 150 is 180
The cylinder 140 and the magnetic tape 150 are controlled at a predetermined cylinder rotation speed and a predetermined tape feed speed by a servo control circuit (not shown in FIG. 1). At the time of reproduction, signals reproduced from the magnetic tape 150 by the digital signal timing heads 170 to 173 are sent to the digital signal processing circuit 120 via the selection circuit 135. Digital signal processing circuit 12
At 0, a predetermined reproduction signal processing is performed on the reproduction signal. The predetermined signal processing is basically digital demodulation, error correction processing using an error correction code added at the time of recording, channel synthesis, and the like. The signal subjected to the above reproduction signal processing is transmitted to the terminal 1
0 is sent to the digital signal decoder 40.

Here, the configuration of the digital signal processing circuit 120 is shown in FIG. 6, and the signal processing will be described. In general, a method is known in which a signal of a high transmission rate is divided into channels and subjected to parallel signal processing to lower the signal processing rate. In the present embodiment, a case where two channels are divided will be described as an example. Of course, if the signal rate does not exceed the signal processing capability, it is obvious that channel division is not required. In FIG. 6, 600
Is a recording signal input terminal of the digital signal processing circuit 120,
610 is a channel dividing circuit for dividing an input signal into channels, 615 and 616 are recording system memories, 620 and 625
Is an error correction code adding circuit, 630 and 635 are digital modulation circuits, 602 and 603 are recording signal output terminals, 640
Is a control circuit, 605 and 606 are reproduction signal input terminals, 65
0 and 655 are digital demodulation circuits, 660 and 665 are error correction circuits, 675 and 676 are reproduction system memories, 670 is a channel synthesis circuit, and 608 is a reproduction signal output terminal.

According to the present invention, it is possible to realize an information recording / reproducing apparatus capable of recording a plurality of programs in a multiplexed manner as described above, and selecting and recording / reproducing some programs. . The above object is achieved as follows. A means for selecting a desired signal from the time-division-compressed and time-division multiplexed digital information signal is provided, and the selected signal is time-division multiplex-recorded at the selected time-axis-compressed speed, and reproduced during reproduction. This is achieved by changing the signal processing rate according to the number of signals and outputting.

First, at the time of recording, the digital information signal is input from the input terminal 600 to the digital signal processing circuit 120 and sent to the channel dividing circuit 610. It is assumed that four programs are time-division multiplexed in the input digital information signal (FIG. 7A). In this embodiment, two-channel division recording is performed. The signals (FIGS. 7 (2) and (3)) divided into two channels by the channel dividing circuit 610 are respectively stored in the recording system memory 61.
5, 616. The writing and reading of the recording system memories 615 and 616 are controlled by the control circuit 640. The operation of the recording memories 615 and 616 will be described with reference to FIG. In FIG. 7, W indicates writing to the memory, and R
Represents reading from the memory. First, when recording all signals multiplexed on the time axis, as shown in FIGS. 7 (4) and (5), signals divided into two channels are stored in the recording memories 615 and 616, respectively, at 1/1 / of the input transmission rate. The data is written at a rate of 2 and sent to the read error correction code adding circuits 620 and 625 at a predetermined rate. Next, a case where only a desired program is selected and recorded from among the signals multiplexed on the time axis will be described with reference to FIG. The example of FIG. 8 is a diagram illustrating a case where only one signal of the input signals multiplexed on the time axis is recorded. The input digital information signal (FIG. 8 (1)) is divided into two channels by the channel dividing circuit 610 (FIGS. 8 (2) and (3)) and sent to the recording memories 615 and 616. Here, when, for example, only α among the programs multiplexed on the time axis is recorded, only the program α is selected in the memories 615 and 616 and written into the memory (FIGS. 8 (4) and (5)). 6
Control is performed at 40. On the other hand, reading from the recording system memories 615 and 616 is performed at the same rate as that for recording all the signals described above, in units of data amount that can be recorded by one scan of the magnetic head. Therefore, since the amount of information to be recorded is small, the data is intermittently read as shown in FIGS. 8 (4) and 8 (5). By this method, the recording system memories 615 and 6
After 16 readings, signal processing can be performed at the same rate, and the circuit scale can be minimized.

As described above, the recording system memories 615 and 6
The signal read out from the error correction code adding circuit 6
20 and 625, an error correction code is added, and if necessary, data rearrangement processing such as shuffling is performed. After the error correction code is added, the data is input to digital modulation circuits 630 and 635, respectively, and subjected to digital modulation processing such as scramble NRZI and 8-10 conversion. The processing mode of the memory is recorded together with the digital information signal, for example, as ID information, and is used for setting a mode of a control circuit at the time of reproduction, setting a tape feed speed, and the like. The processed signals are output from the recording signal output terminals 602 and 603, respectively, and the magnetic heads 170 to 17 are output.
3 is recorded on the magnetic tape 150. At this time,
The control circuit 640 controls the magnetic tape 150 and the cylinder 140 to predetermined tape feed speeds and cylinder rotation speeds. In this embodiment, as an example, the cylinder rotation speed is constant,
The tape feed speed is switched according to the amount of recorded information. When recording all information, data is recorded each time the magnetic heads 170 to 173 scan the tape once. on the other hand,
Since the amount of information to be recorded is 1/4 of the total information amount, if the tape feed speed is proportionally increased and the recording is intermittently performed, the recording is performed in a tape format substantially the same as when all the information is recorded. can do. In this embodiment,
Although the cylinder rotation speed is kept constant, the same tape format can be used for both selective recording and full recording by controlling the tape feed speed and the cylinder rotation speed at the same ratio. In this way, by allowing an arbitrary number of programs to be selectively recorded out of the time axis multiplexed programs of the input digital information signal,
It is also possible to cope with a case where a program to be watched is being broadcast at the same time.

Next, at the time of reproduction, the recorded signal is input to the digital signal processing circuit 120 from the reproduction signal input terminals 605 and 606 via the magnetic heads 170 to 173. The ID information added at the time of recording is detected from the reproduction signal, and a processing mode such as a tape feed speed is set. The reproduced signals of the two channels are sent to digital demodulation circuits 650 and 655, respectively, and are subjected to predetermined digital demodulation processing. Thereafter, using the error correction code added at the time of recording, the error correction circuits 660 and 665 perform a process of correcting an error generated at the time of recording and reproduction. If the data is shuffled at the time of recording, a deshuffling process for rearranging the data in the order of the original data is performed. The processed two-channel reproduction signals are sent to the reproduction memories 675 and 676. Control of writing and reading of the reproduction memories 675 and 676 is performed by the control circuit 640. The operation of the reproduction memories 675 and 676 will be described with reference to FIG. First, a case where all digital information signals are recorded at the time of recording will be described. 2 channel reproduction signal (FIG. 9 (1),
(2)) is a reproduction system memory 67 at a predetermined rate.
5, 676 (FIGS. 9 (3), (4)). Reading from the reproduction system memories 675 and 676 is performed at a rate of 1/2 of the input digital information signal (in the present embodiment, for dividing into two channels) (FIGS. 9 (3) and (4)). 670. Here, the two-channel reproduced signal is combined with the original one-channel signal and output from the reproduced signal output terminal 608. The reproduction signal output from the reproduction signal output terminal 608 is input to the digital information signal decoder 40, and a desired program can be selected and viewed from the time-division multiplexed signal. next,
A description will be given of reproduction in the case where the digital information signal multiplexed on the time axis is selectively recorded at the time of recording. Here, the operation of the playback system memories 675 and 676 in the case of reproducing a tape on which one program is selectively recorded from the four time-division multiplexed programs shown at the time of recording will be described with reference to FIG.
This will be described with reference to FIG. The processing mode, the tape feed speed, and the like are set from the ID information added at the time of recording. In this example, the tape feed speed is set to 1/4 of the time when all information is recorded.
As shown in 0 (1) and (2), reproduced data is obtained intermittently. The reproduced signals of these two channels are shown in FIG.
As shown in (3) and (4), the reproduction system memories 675 and 67
6 is written. Reading from the reproduction-system memories 675 and 676 is performed at a rate of about 1/2 of the transmission rate of the original digital information signal (in the present embodiment, the channel is divided into two).
As shown in FIGS. 10 (3) and 10 (4), the data is read out intermittently and dummy data (for example, data representing invalid data) is inserted between the reproduced data (the hatched portions in FIGS. 10 (3) and 10 (4)). Then, it is input to the channel synthesis circuit 670. Here, the two-channel reproduced signal is combined with the original one-channel signal and output from the reproduced signal output terminal 608.
The reproduction signal output from the reproduction signal output terminal 608 is input to the digital information signal decoder 40, and the contents can be viewed after decoding. In the example shown in FIG.
Reading from the reproduction system memories 675 and 676 is performed at a rate 1/2 of the transmission rate of the original digital information signal,
The example in which dummy data is inserted between data and output is described. However, when recording is selectively performed, the reproduction system memory 6
The reading methods of 75 and 676 are not limited to this example, and other methods may be used. FIG. 11 shows an example of another method. FIG.
In (1), (1) and (2) indicate signals to be reproduced,
As described above, the tape feed speed is 1/4 of that for recording all information.
And the reproduction data is obtained intermittently. The two-channel reproduction signals are written into the reproduction memories 675 and 676 as shown in FIGS. Reading from the reproduction system memories 675 and 676 is performed as shown in FIG.
It is also possible to read continuously as shown in (3) and (4).

In the example described above, the case where one signal is selectively recorded / reproduced from the time-division multiplexed input signal has been described, but the present invention is not limited to this. This is also effective when a plurality of programs are selectively recorded and reproduced from a signal multiplexed on the time axis.

In this embodiment, the case where the terminal, the recording / reproducing apparatus, and the monitor are separate has been described. However, for example, a monitor in which a monitor and a terminal are integrated, that is, a monitor with a built-in decoder is also conceivable. The present invention is also effective in this case . Similarly, the present invention can be applied to a recording / reproducing device with a built-in decoder , in which a terminal and a recording / reproducing device are integrated.

As described above, according to the present invention, it is possible to realize a decoder and an information recording / reproducing apparatus compatible with both analog information services and digital information services .

[0037]

According to the present invention, it is possible to realize a terminal and a recording / reproducing apparatus which are compatible with both new digital information services in addition to conventional analog information services .

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration example of a decoder for an analog information signal of a terminal.

FIG. 3 is a block diagram illustrating a configuration example of an analog signal processing circuit of the recording / reproducing apparatus.

FIG. 4 is a diagram illustrating an example of a digital information signal.

FIG. 5 is a block diagram showing a configuration example of a digital information signal decoder of the terminal.

FIG. 6 is a block diagram illustrating a configuration example of a digital signal processing circuit of the recording / reproducing apparatus.

FIG. 7 is a diagram illustrating a recording signal process of the recording / reproducing device.

FIG. 8 is a diagram illustrating recording signal processing of the recording / reproducing device.

FIG. 9 is a diagram illustrating a reproduction signal process of the recording / reproduction device.

FIG. 10 is a diagram illustrating a reproduction signal process of the recording / reproduction device.

FIG. 11 is a diagram illustrating another method of the reproduction signal processing of the recording / reproduction device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Terminal 30 ... Decoder for analog information signal 40 ... Decoder for digital information signal 60 ... Decoder usage recording element 100 ... Information recording / reproducing device 110 ... Analog signal processing circuit 120 ... Digital information signal processing circuit 230 ... Decoder for analog information signal Usage amount check circuit 560 ... Digital information signal decoder usage amount check circuit 615,616 ... Recording memory 675,676 ... Reproduction memory 640 ... Control circuit

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroo Okamoto 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Media Research Laboratory of Hitachi, Ltd. (72) Kazuhiko Yoshizawa 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Within Hitachi, Ltd. Image Media Research Laboratories (56) References JP-A-63-298865 (JP, A) JP-A-3-121685 (JP, A) JP-A-8-9329 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G11B 20/00, 20/10 H04N 5/91-5/956 H04N 7/24

Claims (6)

(57) [Claims] A receiving means capable of receiving analog video information and digital video information; an analog recording signal processing means for generating an analog recording signal from the analog video information received by the receiving means; Digital recording signal processing means for generating a digital recording signal from video information; first selection means for selecting one of the analog recording signal processing means and the output of the digital recording signal processing means; Signal recording means for recording an output on a recording medium, and when the receiving means is receiving analog video information, the first selecting means selects the output of the analog recording signal processing means, When the signal recording means performs analog recording on a recording medium and the receiving means receives digital video information, First selection means selects the output of the digital recording signal processing means, the information recording apparatus characterized by digitally recorded on a recording medium by the signal recording means. 2. A decoding means for decoding digital video information output from said receiving means and converting it into analog video information, and selecting one of the analog video information output from said receiving means and the output of said decoding means. And second selecting means for outputting to the analog recording signal processing means, wherein when the receiving means is receiving digital video information, the second selecting means selects the output of the decoding means. One of an analog recording for recording an analog recording signal generated by the analog recording signal processing means and a digital recording for recording a digital recording signal generated by the digital recording signal processing means from the digital video information. 2. The information recording apparatus according to claim 1, wherein the recording is performed by selecting by one of the selecting means. 3. A receiving means capable of receiving analog video information and digital video information, a digital recording signal is generated from the digital video information received by the receiving means during digital recording, and a digital video signal is generated from the reproduced signal during digital reproduction. Digital signal processing means for reproducing information; and a third selection for selecting digital video information reproduced by the digital signal processing means during digital reproduction, and otherwise selecting digital video information received by the reception means. Means, decoding means for decoding the digital video information selected by the third selecting means and converting the digital video information into analog video information, and generating an analog recording signal from the analog video information received by the receiving means at the time of analog recording; At the time of analog playback, the analog signal is played back from the playback signal. Log signal processing means, first selection means for selecting a digital recording signal generated by the digital signal processing means during digital recording, and selecting an analog recording signal generated by the analog signal processing means during analog recording, At the time of analog or digital recording, the signal selected by the first selecting means is recorded on a recording medium, and at the time of analog or digital reproduction, signal recording / reproducing means for reproducing a signal from the recording medium, and outputting analog video information. And a signal output unit. When recording the analog video information received by the receiving unit, the analog signal processing unit generates an analog recording signal from the received analog video information. Analog recording of the selected analog recording signal on a recording medium by the signal recording / reproducing means. When recording the digital video information received by the receiving means, a digital recording signal is generated by the digital signal processing means from the received digital video information, and the digital recording signal generated by the first selecting means is selected. Is digitally recorded on a recording medium by the signal recording / reproducing means. At the time of analog reproduction, analog video information is reproduced by the analog signal processing means from a signal reproduced from the recording medium by the recording / reproducing means, and the signal output means And at the time of digital reproduction, digital video information is reproduced by the digital signal processing means from the signal reproduced from the recording medium by the recording and reproduction means.
An information recording / reproducing apparatus, wherein the reproduced digital video information selected by the selection means is decoded by the decoding means, converted into analog video information, and output from the signal output means. 4. The digital video information recording apparatus according to claim 1 , further comprising second selection means for selecting one of the analog video information received by said reception means and the analog video information decoded by said decoding means, and recording the digital video information received by said reception means. Digital recording for recording a digital recording signal generated by the digital signal processing means from the received digital video information; and selecting the received digital video information by the third selecting means. The video information is decoded by the decoding means, converted into analog video information, the second selection means selects the decoded analog video information, and an analog recording signal generated by the analog signal processing means is recorded. Recording is performed by selecting either one of the recording and the recording by the first selecting means. The information recording / reproducing apparatus according to claim 3, wherein 5. An information recording apparatus for selectively recording one of analog video information and digital video information, comprising: an analog video information input means for inputting the analog video information; and a digital video information input means for inputting the digital video information. Means, an analog recording signal processing means for generating an analog recording signal from the analog video information from the analog video information input means, and a digital recording signal processing for generating a digital recording signal from the digital video information from the digital video information input means Means, first selection means for selecting one of the outputs of the analog recording signal processing means and the digital recording signal processing means, signal recording means for recording the output of the first selection means on a recording medium, Having analog video information from the analog video information input means. When input, the first selecting means selects the analog recording signal generated by the analog recording signal processing means, records the analog recording signal on a recording medium by the signal recording means, and outputs a digital signal from the digital video information input means. When video information is input, the first selecting means selects a digital recording signal generated by the digital recording signal processing means, and digitally records the digital recording signal on a recording medium by the signal recording means. Recording device. 6. An information recording / reproducing apparatus for selecting and recording one of analog video information and digital video information, comprising: an analog video information input means for inputting the analog video information; and a digital video inputting the digital video information. Information input means; digital signal processing means for generating a digital recording signal from the digital video information input from the digital video information input means at the time of digital recording, and reproducing digital video information from the reproduction signal at the time of digital reproduction; Analog signal processing means for generating an analog recording signal from the signal input from the analog video information input means at the time, and analog signal processing means for reproducing the analog video information from the reproduction signal at the time of analog reproduction, and digital signal processing means at the time of digital recording. Digital recording signal A first selection means for selecting an analog recording signal generated by the analog signal processing means during analog recording; and a signal selected by the first selection means upon analog or digital recording, on a recording medium. A signal recording / reproducing means for reproducing a signal from a recording medium at the time of analog or digital reproduction; an analog video information output means for outputting analog video information reproduced by the analog signal processing means; and a digital signal processing means. Digital video information output means for outputting reproduced digital video information, and when analog video information is input from the analog video information input means, the first selection means is provided by the analog signal processing means. Select the generated analog recording signal, and record the analog recording signal on the recording medium by the signal recording / reproducing means. When digital video information is input from the digital video information input means, the first selection means selects the digital recording signal generated by the digital signal processing means, and the digital recording signal is reproduced on the recording medium by the signal recording / reproducing means. At the time of analog reproduction, analog video information is reproduced by the analog signal processing means from the signal reproduced analogly from the recording medium by the recording / reproduction means and output from the analog video information output means. An information recording / reproducing apparatus, characterized in that the digital signal processing means reproduces digital video information from a signal digitally reproduced from a recording medium by the recording / reproducing means and outputs the digital video information from the digital video information output means.