JP3405336B2 - Digital information recording / reproducing apparatus, recording / reproducing method, and transmitting method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus , a recording / reproducing method, and a transmitting method for digital information signals, and more particularly, recording control signals by adding control information to the recording signals and reproducing them by utilizing the additional information. A digital information recording / reproducing device ,
The present invention relates to a recording / reproducing method and a transmitting method .

[0002]

2. Description of the Related Art Journal of Television Engineering, Vol. 47, No. 4 (1
993) as described on pages 494 to 497,
A system for transmitting audio and video software or the like via radio waves or a cable and recording it at each home has been considered.

[0003]

When the audio and video software is sold or rented by the above-mentioned conventional technique, there is a problem that the sales destination, the number of rental days, and the like must be managed.

The object of the present invention is to solve the above problems,
It is an object of the present invention to provide a digital information recording / reproducing apparatus capable of easily managing the sales destination, the number of rental days, and the like.

[0005]

In order to achieve the above object, the present invention provides a digital signal transmitted with additional information added.
The digital information signal is recorded on the recording medium and reproduced from the recording medium.
A digital information recording / reproducing apparatus, wherein the additional information is
Is used to identify the sales form of the digital information signal.
Separate means and control signal used for reproduction control from the additional information
Control signal generating means for generating the digital information signal.
Recording means for recording by adding the control signal to the signal,
According to the sales form of the digital information signal, the above recorded
It can be reproduced only by the device that recorded the digital information signal.
And a reproducing means for enabling the reproduction. In addition,
It is a digital information recording / reproducing method in which additional information is added.
Before receiving the digital information signal transmitted by
The digital information signal is recorded on a recording medium, and the additional information is recorded.
Depending on the sales form of the digital information signal included in the report
In the device that records the recorded digital information signal,
Only playable. Also, record digital information.
A recording / reproducing apparatus for recording on a recording medium and reproducing from the recording medium.
In contrast, digital information transmission that transmits digital information signals
And a method of transmitting additional information to the digital information signal.
The step of adding, and the digit to which the additional information is added
The transmission of the digital information signal through the transmission line.
However, here, the additional information is recorded by the recording / reproducing apparatus.
After recording the digital information signal, it is included in the additional information.
Depending on the sales form of the digital information signal,
The recorded digital information signal can only be played back on the device on which it was recorded.
It controls to be able to do.

[0006]

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a digital information recording / reproducing apparatus according to the present invention, which is roughly divided into a transmitting system 100, a receiving system 200 and a recording / reproducing system 300, and 1 is an input terminal, Reference numeral 10 is a transmission encoder, 20 is a time axis compressor, 25 is a modulator, 30 is a transmission line, 35 is a demodulator, 40 is a recording encoder, 45 is a switching switch, and 50 is a switching switch.
Is a rotating drum, 51a and 51b are magnetic heads, 60 is a magnetic tape, 70 is a reproducing system decoder, 80 is a receiving system decoder,
9 is an output terminal. In the magnetic heads 51a and 51b, (+) indicates positive azimuth and (-) indicates negative azimuth.

In the figure, the operation of the transmission system 100 is such that the digital information signal input from the input terminal 1 is encoded in a predetermined format by the transmission system encoder 10 and 1 / n (by the time axis compressor 20. In the present invention, n is set to an integer of 2 or more) and the transmission rate is increased to n times by the time base compression, modulated by the modulator 25 and sent to the transmission line 30.

In the receiving system 200, the signal received via the transmission line 30 is demodulated by the demodulator 35, and the demodulated signal is directly recorded in the recording / reproducing system 300 in the state of being encoded in the transmitting system. It is supplied to the system encoder 40. The recording encoder 40 records and encodes the supplied signal in a format suitable for recording and reproduction.

FIG. 2 is a block diagram showing an example of the configuration of the recording system encoder 40. 41 is a storage circuit, 42 is an interface circuit, 43 is a parity generation circuit, 44 is a recording signal generation circuit, and 301 is It is a control information generation circuit.
In the figure, the data demodulated by the demodulator 35 of the reception system 200 is first stored in the storage circuit 41 via the interface circuit 42. FIG. 3A shows this demodulated data. The parity generation circuit 43 generates the parity from the demodulated data stored in the storage circuit 41, and the storage circuit 4
Stored in 1. The recording signal generation circuit 44 reads the demodulated data and the parity stored in the storage circuit 41, adds the ID signal and the synchronization signal formed of the control information and the like generated by the control signal generation circuit 301, and is added to FIG. Output as a block format signal as shown. FIG. 4 is a configuration example of an ID signal. For example, a track number for identifying a recording track, a block number for identifying a position in the track, control information, and error detection and correction of the ID signal. It is configured with parity.

The signal encoded by the recording system in this way is passed through the switching switch 45 to the 18 of the rotary drum 50.
Magnetic heads 51a, 5 mounted at positions facing each other by 0 degree
1b and is recorded on the magnetic tape 60 in azimuth. FIG. 5 shows the track pattern at this time. The rotational speed of the rotary drum 50 and the running speed of the magnetic tape 60 are set to R1 and V1, as in the conventional case, P is the track pitch, and W is the head width of the magnetic heads 51a and 51b. In this embodiment, the head width W is larger than the track pitch P and is set to 1.5 times, for example.

At the time of reproduction, the rotary drum 50 is rotated at the same speed R1 as that at the time of recording, and the magnetic tape 60 is 1 / n of the time of recording.
The recorded signal is reproduced by the magnetic heads 51a and 51b. FIG. 6 is a diagram showing the track pattern at the time of this reproduction. The solid line shows the recorded track pattern, and the broken lines show the magnetic heads 51a, 5a.
1b shows a scanning trajectory. In this way, since the rotary drum 50 is rotated at the same speed R1 as during recording and the magnetic tape 60 is run at a speed V1 / n that is 1 / n during recording, the scanning pitch of the magnetic heads 51a and 51b is It becomes 1 / n of the track pitch P, and the scanning angle shifts slightly, but it is almost 1
Scanning is performed n times per track. In this embodiment, n is set to 3 in order to simplify the explanation. W
Indicates the head width of the magnetic heads 51a and 51b, and
The head width (W) is larger than the track pitch (P), and is set to 1.5 times, for example.

FIG. 7 shows the structure of the control signal. The program number is information indicating what number program is on the tape, and the time information is information indicating elapsed time in the tape and in the program. The type is information indicating the type such as whether the recorded digital information signal is sold or rented. The information may be further subdivided according to whether the sold information is sold only to a specific user, the number of days to rent, or the like. The recording date and time is the date and time at the time of recording, and the user number is the registration number of the recorded user, and is stored in the receiving system 200 or the recording / reproducing system 300.

The control information can be recorded in a distributed manner in a plurality of blocks to reduce redundancy. Further, as shown in FIG. 8, it may be recorded in an area different from that of the digital information signal. In this case, the block configuration is the same as that of the digital information signal recording area, and FIG.
The control information may be recorded in the portion where the demodulated data in (B) is recorded. Note that the reliability can be improved by multiple-writing the control information.

In order to receive the service of selling or renting the digital information signal, when the user applies to the sender, the sender sends the digital information signal together with the user number and additional information indicating the type of sale or rental. To do. On the receiving side, the user number in the additional information is identified in the receiving system 200 or the recording / reproducing system 300, and if they match, the information is recorded. At this time,
The type of sale or rental is identified from the additional information and recorded as information indicating the type in the control information.

FIG. 9 is a block diagram showing an example of the structure of the reproducing system decoder 70 which performs the processing of the entire reproducing system. Reference numeral 71 is a storage circuit, 72 is a block reproduction circuit, 73 is an error correction circuit, 74 is a reproduction signal output circuit, and 302 is a control signal detection circuit. In the figure, the signals reproduced by the magnetic heads 51a and 51b are first input to the block reproducing circuit 72. The block reproducing circuit 72 detects the sync signal and the ID signal and stores them in a predetermined position on the memory circuit 71 based on the track number and the block number in the ID signal. The error correction circuit 73 corrects the error in the reproduced data by using the parity stored in the storage circuit 71, and at the same time, generates a pointer indicating the error state and stores it in the storage circuit 71. At this time, the data of the same track number and block number is input to the memory circuit 71 n times, but the data with the best error state is finally stored by the pointer. Playback signal output circuit 74
Then, the error-corrected data stored in the storage circuit 71 is read in the order of the track number and the block number, and the low-speed data expanded in the time axis is output.

The low-speed data signal subjected to the reproduction system decoding process in this manner is sent to the reception system 200, and the reception system decoder 80 de-encodes the transmission system. Then, the signal decoded into this original digital information signal is output terminal 9
Will be output.

As described above, by arranging the reception system decoder 80 not before the recording / reproducing section 300 but after it, the reception system decoder 80 can perform low-speed processing.

The control signal detection circuit 302 discriminates the control information and determines whether or not to reproduce. For example, in the case of sold information, when the user numbers match depending on the sales mode, that is, the information can be reproduced only on the recorded device and cannot be reproduced on other devices. In the case of rented information, the recording date and time and the rental period are compared, and if the rental period has expired, reproduction is prohibited. Note that this control may be performed by the reception system 200. In this case, the control signal reproduced by the recording / reproducing system 300 is output to the receiving system 200.

FIG. 10 is a block diagram showing another embodiment of the digital information recording / reproducing apparatus according to the present invention. The present invention is applied to a system in which video software is encrypted and transmitted so that only subscribers can record / reproduce. Here is an example. In the figure, 15 is a scrambler, 52a and 52b are magnetic heads, 75 is a descrambler, 101, 102 and 103 are input terminals, 111 and 112 are A / D converters, 121 and 1
22 is an information amount compressor, 201 and 202 are information amount decompressors,
211 and 212 are D / A converters, 221, 222 and 22.
Reference numeral 3 is an output terminal, and the portions corresponding to those in FIG. The magnetic head 52
In a and 52b, (+) indicates positive azimuth and (−) indicates negative azimuth.

In the transmission system 100, the image signal input from the input terminal 101 is converted by the A / D converter 111 into an A signal.
Then, the information amount is compressed to a proper rate by the information amount compressor 121. The audio signal input from the input terminal 102 is A / D converted by the A / D converter 112, and the information amount compressor 122 compresses the information amount up to an appropriate rate. The image signal and the audio signal, which have been A / D-converted and whose information amount has been compressed, together with the independent data input from the input terminal 103, are time-division multiplexed by the transmission encoder 10.
And encoded and scrambled by the scrambler 15. Hereinafter, this secret signal is time-axis compressed to 1 / n by the time-axis compressor 20 as in the embodiment of FIG.
It is modulated by the modulator 25 and sent out to the transmission line 30.

In the receiving system 200, as in the embodiment of FIG.
The signal received via the transmission line 30 is demodulated by the demodulator 35, and the demodulated data is supplied to the recording system encoder 40 of the recording / reproducing system 300.

In the recording / reproducing system 300, the supplied demodulated data is recorded / encoded by the recording system encoder 40, and the two sets of magnetic heads 51a, 51 are transferred through the switching switch 45.
b, 52a, 52b, and two-channel azimuth recording is performed on the magnetic tape 60. These two sets of magnetic heads 51
The recording frequency can be reduced to 1/2 by two-channel recording using a, 51b, 52a and 52b.
The rotation speed of the rotary drum 50 and the running speed of the magnetic tape 60 are set to R2 and V2, for example.

At the time of reproduction, the rotary drum 50 is rotated at the same speed R2 as that at the time of recording, and the magnetic tape 60 is 1 / n of the time of recording.
The recorded signal is reproduced by the pair of magnetic heads 51a and 51b. In this embodiment, the coefficient n of time base compression is set to be sufficiently large (the larger this n is, the more desirable), and even in one-channel reproduction by one set of magnetic heads 51a and 51b, n / 2 times per track. Since it can be traced, the playback decoder 7
When 0, the same processing as that of the embodiment of FIG. 1 is performed, whereby sufficient data reproduction is possible. As a result, there is an effect that only one system of the reproduction system is required and the circuit scale can be reduced.

In the receiving system 200, the signal decoded by the reproducing system decoder 70 is received, the descrambler 75 deciphers the signal encrypted in the transmitting system, and the receiving system decoder 80 decodes the signal encoded in the transmitting system. Decode to separate image signal, audio signal and independent data. The separated image signal and audio signal are respectively the information amount expander 201,
The original information amount is expanded by 202, and the D / A converter 2
D / A converted by 11, 212, output terminal 221,
It is output from 222. Further, the separated independent data is output from the output terminal 223.

FIG. 11 shows the structure of the control signal of the embodiment shown in FIG. The scramble information is information necessary for performing descrambling. Normally, this information is received by the receiving system 20.
It is stored in 0. By storing this scramble information as control information and outputting the scramble information reproduced at the time of reproduction to the receiving system 200 to perform descrambling, the recorded information can be reproduced even if the scramble is changed. .

In the case of rented information, if the scramble is changed regularly and the scramble information is not recorded in the control information, the information after a certain period cannot be descrambled, This also allows the rental period to be managed.

[0029]

As described above, according to the present invention, in a system in which audio and video software or the like is sold or rented via radio waves or cables, the sales destination, rental period, etc. can be easily managed. can do.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a digital information recording / reproducing apparatus according to the present invention.

FIG. 2 is a block diagram showing a configuration example of a recording encoder according to the present invention.

FIG. 3 is a diagram showing input / output signals of the recording encoder shown in FIG.

FIG. 4 is a diagram showing a configuration example of an ID signal.

5 is a diagram showing a track pattern at the time of recording in the embodiment of FIG.

FIG. 6 is a diagram showing a track pattern during reproduction in the embodiment of FIG.

FIG. 7 is a diagram showing a configuration example of a control signal.

FIG. 8 is a diagram showing another embodiment of a control signal recording system.

FIG. 9 is a block diagram showing a configuration example of a reproduction system encoder according to the present invention.

FIG. 10 is a block diagram showing another embodiment of the digital information recording / reproducing apparatus according to the present invention.

11 is a diagram showing a configuration example of a control signal of the embodiment in FIG.

[Explanation of symbols]

10 ... Transmission system encoder, 15 ... Scrambler, 20 ... Time axis compressor, 25 ... Modulator, 35 ... Demodulator, 40 ... Recording system encoder, 41 ... Storage circuit, 42 ... Interface circuit, 43 ... Parity generation Circuit, 44 ... Recording signal generating circuit, 50 ... Rotating drum, 51a, 51b, 52a, 52
b ... Magnetic head, 60 ... Magnetic tape, 70 ... Reproduction system decoder, 71 ... Storage circuit, 72 ... Block reproduction circuit, 73 ...
Error correction circuit, 74 ... Reproduction signal output circuit, 75 ... Descrambler, 80 ... Receiving system decoder, 111, 112 ... A /
D converter, 121, 122 ... Information amount compressor, 201, 2
02 ... Information expander, 211, 212 ... D / A converter,
301 ... Control signal generation circuit, 302 ... Control signal detection circuit.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobutaka Amada, 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Inside the Hitachi Media Visual Media Research Institute (72) Inventor Shigeru Yamazaki 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Address Stock Company, Hitachi, Ltd. Visual Media Research Laboratories (56) Reference JP-A-4-86177 (JP, A) JP-A-2-41091 (JP, A) JP-A-5-258463 (JP, A) (58) ) Fields surveyed (Int.Cl. ⁷ , DB name) H04N 5/76-5 / 956,7 / 16 G11B 20/10

Claims (9)

(57) [Claims] 1. A digital information recording / reproducing apparatus for recording, on a recording medium, a digital information signal transmitted with additional information added thereto and reproducing from the recording medium, wherein the additional information is used to sell the digital information signal. Identification means for identifying, control signal generation means for generating a control signal used for reproduction control from the additional information, recording means for adding the control signal to the digital information signal and recording the digital information signal, and selling form of the digital information signal And a reproducing means for reproducing the recorded digital information signal only by the apparatus which recorded the digital information signal. 2. The digital information signal is confidential information, and when the digital information signal is reproduced by the reproducing means in a specific sales form, the recorded digital information signal is secret. The digital information recording / reproducing apparatus according to claim 1, wherein the digitalization is canceled. 3. A digital information recording / reproducing apparatus for recording, on a recording medium, a digital information signal transmitted with additional information added thereto and reproducing from the recording medium, wherein a sales form of the digital information signal is obtained by the additional information. Identification means for identifying, control signal generation means for generating a control signal used for reproduction control from the additional information, recording means for adding the control signal to the digital information signal and recording the digital information signal, and selling form of the digital information signal In accordance with the above, there is provided a reproducing means for preventing the recorded digital information signal from being reproduced by a device other than the device which recorded the digital information signal. 4. A digital information signal transmitted by adding additional information is received, the received digital information signal is recorded on a recording medium, and the digital information signal included in the additional information is sold according to a sales form. A digital information recording / reproducing method, characterized in that the recorded digital information signal can be reproduced only by an apparatus which recorded it. 5. The digital information signal is confidential information, and when the sales form is a specific sales form, the recorded digital information signal is released from the secret form. Item 4. The digital information recording / reproducing method according to Item 4. 6. A digital information signal transmitted by adding additional information is received, the received digital information signal is recorded on a recording medium, and the digital information signal included in the additional information is sold according to a sales form. A digital information recording / reproducing method, characterized in that the recorded digital information signal cannot be reproduced by a device other than the device which recorded the digital information signal. 7. A digital information transmitting method for transmitting a digital information signal to a recording / reproducing apparatus for recording digital information on a recording medium and reproducing from the recording medium, the method comprising adding additional information to the digital information signal. And a step of transmitting the digital information signal to which the additional information is added via a transmission path, wherein the additional information is recorded in the additional information after the recording / reproducing apparatus records the digital information signal. A method for transmitting digital information, characterized in that the recorded digital information signal is controlled so as to be reproducible only by a recording device according to a sales form of the digital information signal. 8. The digital information signal to be transmitted is confidential information, and the additional information is the recorded digital information signal when the sales form of the digital information signal is a specific sales form. The digital information transmitting method according to claim 7, wherein the confidential information is released. 9. A digital information transmitting method for transmitting a digital information signal to a recording / reproducing apparatus which records digital information on a recording medium and reproduces the information from the recording medium, wherein the additional information is added to the digital information signal. And a step of transmitting the digital information signal to which the additional information is added via a transmission path, wherein the additional information is recorded in the additional information after the recording / reproducing apparatus records the digital information signal. A method for transmitting digital information, characterized in that the digital information signal is controlled so that it cannot be reproduced by an apparatus other than the apparatus in which the recorded digital information signal is recorded, depending on the type of sale of the digital information signal.