JP2715822B2 - Digital recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CD (Compact Disk), a DAT (Digital Audio
The present invention relates to a digital recording apparatus for recording analog information on a recording medium in the form of digital data, such as a tape, a DCC (digital compact cassette), and an MD (mini disk). The present invention relates to a digital recording apparatus in which copying in a form is technically restricted.

[0002]

2. Description of the Related Art In a digital recording apparatus for recording an audio signal in the form of digital data, such as a DAT or DCC, it is technically restricted to copy digital data in its original form due to copyright problems. SCM
It is mandatory to adopt the S (serial copy management system) method. In the SCMS method, encrypted medium information is embedded in original software, and the recording device reads the medium information, and the recording medium of the copy source is a medium that can be copied for only one generation, or copying is prohibited. Determine if it is a medium. According to this method,
The original software of DCC can be copied only for one generation, and re-copying from the tape created by this copy is prohibited.

[0003]

However, in such a conventional SCMS digital recording apparatus, a copy prohibition code is also recorded on a tape edited by a listener as digital data, and the child or grandchild tape is operated by the apparatus. I can not make it. In addition, even if a digital recording was made from an analog source, or if the listener was aware of some sound quality deterioration and created a tape that was once converted to analog and edited by digital recording for personal enjoyment, copy restrictions were imposed. Therefore, there is a problem that it is not easy to produce a desired number of dubbing tapes.

The present invention has been made to solve such a problem, and a desired number of dubbing tapes can be easily prepared with the same feeling as a conventional analog recording apparatus without impairing the basic idea of the SCMS system. It is an object to provide a digital recording device that can be created.

A digital recording apparatus according to the present invention has a function of restricting copying of digital data from a copy source recording medium on which digital data is recorded to a copy destination recording medium in a form with little deterioration. A first medium copying method for inputting digital data read from the copy source recording medium and copying the digital data to the copy destination recording medium in a form with little deterioration, and a digital data read from the copy source recording medium. Enter this and
Selecting means by which a user can arbitrarily select any one of a second medium copying method to be recorded on the copy destination recording medium in a form having a greater deterioration than the first medium copying method by an external operation, and the copy source recording medium Digital data stored in
Prohibits copying by the first medium copying method.
Determining means for determining whether or not the digital data is present; decoding / encoding means for inputting digital data read from the copy source recording medium, decoding the digital data, and re-encoding the digital data;
The first digit which does not pass through the decoding / encoding means
Data and encoded by the decoding / encoding means.
And input the second digital data
Switching means for outputting, recording means for recording digital data output from the switching means on the copy destination storage medium, user selection by the selection means and the discrimination means
For switching the switching means based on the determination result by
Control means, wherein said selecting means selects a first medium copying method.
The method is selected and the first medium is determined by the determination means.
If it is determined that the copying method is not prohibited
The switching means outputs first digital data.
And a first medium copying method by the selection means.
Is selected, and the first medium copy is performed by the determination means.
If it is determined that the shooting method is prohibited,
Switching means to output the second digital data.
And the selecting means selects the second medium copying method.
If it has been selected, the previous
The switching means outputs the second digital data.
Control means for switching control .

[0006]

[0007]

According to the digital recording apparatus of the present invention, when the first medium copying method is selected by the selecting means , the discriminating means is used.
It is determined that the first medium copying method is not prohibited
Only when this is done , the digital data is copied from the copy source recording medium to the copy destination recording medium in a form with little deterioration, but re-copying from the recording medium copied in such a form is prohibited. . Therefore, copying is considerably restricted. Hereinafter, such a copy mode is referred to as “copy”.

On the other hand, when the second medium copying method is selected by the selection means, the digital data read from the copy source recording medium is once decoded by the decoding / encoding means and then encoded again. . Then, the re-encoded digital data is recorded on the copy destination recording medium. According to the second medium copying method, although there is some signal deterioration, there is no copy restriction as in the first medium copying method. Therefore, copying is possible even from a medium that cannot be copied, and there is no restriction on the number of copies. Hereinafter, such a copy mode is referred to as “dubbing”.
Call.

Further, according to the digital recording apparatus of the present invention, the discriminating means determines whether or not the digital data recorded on the copy source recording medium prohibits copying. If it is determined that the digital data recorded on the copy source recording medium prohibits copying, the selection means selects the first medium copy method.
Even if the data has been read, the digital data read from the copy source recording medium is once decoded by the decoding / encoding means and then encoded again, and the re-encoded digital data is recorded (dubbed) on the copy destination recording medium. ).

Therefore, according to the present invention, SCMS
It is possible to easily create a desired number of dubbing tapes in the same manner as a conventional analog recording apparatus without impairing the basic concept of the system.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram of a double cassette type DCC recording / reproducing apparatus according to an embodiment of the present invention, in which one series is omitted. Digital data DIN in a data compressed form read from a copy source DCC via a magnetic head and data reading means (not shown) is input from a digital input terminal 10 and is supplied to a discrimination circuit 1 and a terminals of switch circuits SW1 and SW3. Respectively. The determination circuit 1 reads the encrypted information from the input data DIN and determines whether the copy source DCC is copyable or not. This determination result is given to the system controller 2. The system controller 2 takes in information from the operation panel 3 in addition to the discrimination result. Based on the information, the switch circuit SW1,.
SW2, SW3, and SW4 are switched to set various signal paths.

On the other hand, the digital data DIN supplied to the terminal a of the switch circuit SW3 is applied to the switch circuit SW3,
The data is supplied to the magnetic head 4 via each a terminal of SW4, and is written to the DCC 5 of the copy destination.

The digital data DIN supplied to the terminal a of the switch circuit SW1 is decoded by the decoder 6 and then D / A converted by the D / A converter 7 to become an analog reproduced signal AOUT. This analog reproduction signal AOUT is
The signal is supplied to an external speaker or the like via the analog external output terminal 12, and is also supplied to the terminal a of the output switch circuit SW2. The analog reproduction signal AOUT output from the switch circuit SW2 is A / D-converted by the A / D converter 8 and re-encoded by the encoder 9.
The signal is supplied to the magnetic head 4 via the terminal and the terminal a of the switch circuit SW4.

An analog input signal AIN supplied from a reproduction system such as an analog tape (not shown) is input from an analog external input terminal 11 and is supplied to the switch circuit SW2 by a switch b.
The signal is supplied to the A / D converter 8 via a terminal. The digital data read from the DCC 5 by the magnetic head 4 is output from the digital output terminal 13 as digital data DOUT, and is also supplied to the terminal b of the switch circuit SW1 to be D / A converted by the D / A converter 7.
It is converted into an analog reproduction signal AOUT.

FIG. 2 is a diagram showing an example of the operation panel 3. The operation panel 3 includes a record button 21, a rewind button 22, a play button 23, a stop button 24, a fast forward button 25, an SCMS set / cancel button 26, and an SCMS set / cancel indicator lamp 27.

Next, the operation of the DCC recording / reproducing apparatus thus configured will be described. FIG. 3 is a flowchart showing the operation at the time of reproduction. When the play button 23 is pressed,
The system controller 2 includes switch circuits SW1, SW
4 is set to the terminal b (S1), and then reproduction is started (S2). Thus, the digital data read from the DCC 5 by the magnetic head 4 is transferred to the switch circuit S
W4 → input to the decoder 6 via the path of the switch circuit SW1, where it is decoded, and the D / A converter 7
/ A conversion into an analog reproduction signal AOUT. The analog reproduction signal AUT is output from the analog external output terminal 12 to an external speaker or the like.

FIG. 4 is a flowchart showing the operation at the time of recording. When the record button 21 is pressed, the system controller 2 first sets the switch circuit SW4 to the terminal a (S11). Subsequently, the system controller 2
It is checked whether the SCMS setting / cancellation button 26 has been set or canceled (S12). If the SCMS setting / cancellation button is set, it is determined whether or not the input signal is digital data DIN based on the output from the discrimination circuit 1 (S13). For example, it is determined whether the data can be copied based on the determination result of the determination circuit 1 (S1).
4). If the source can be copied like original software, the switch circuit SW3 is set to the terminal a (S15). Thus, the signal path of the digital input terminal 10 → SW3 → SW4 → magnetic head 4 is set, and the digital data DIN is supplied directly to the magnetic head 4. So, SCM
The copy with the recopy prohibition process is started based on the S method (S16).

On the other hand, when copying is prohibited, for example, when the source is a copied DCC, the switch circuits SW1 and SW2 are connected to the terminal a and the switch circuit SW
3 is set to the terminal b (S17). Thereby, the digital input terminal 10 → SW1 → decoder 6 → D / A converter 7 → SW2 → A / D converter 8 → encoder 9 → SW3
→ SW4 → The signal path of the magnetic head 4 is set. Therefore, the digital data DIN is once decoded and converted into an analog signal, then converted again into digital data and encoded, and dubbed by the DCC 5 (S18).

When the input signal is the analog signal AIN, the switch circuits SW2 and SW3 are set to the terminal b (S19). Thereby, the analog external input terminal 11
→ SW2 → A / D converter 8 → Encoder 9 → SW3 → S
W4 → The signal path of the magnetic head 4 is set. In this case, the analog signal is encoded by the encoder 9 and D
It is recorded in CC5 (S18).

When the SCMS setting / cancellation button is released, the switch circuit SW3 is set to the side b (S
20). If the input signal is digital data DIN (S21), the switch circuits SW1, SW2
Is set to the terminal a side (S22). Thus, similarly to the above-described digital data dubbing, the digital input terminal 10 → SW1 → decoder 6 → D / A converter 7 →
SW2 → A / D converter 8 → Encoder 9 → SW3 → SW
4 → The signal path of the magnetic head 4 is set. Therefore, the digital data DIN is once decoded and converted into an analog signal, then converted again into digital data and encoded, and dubbed by the DCC 5 (S18).

When the SCMS setting / release button is released and the input signal is the analog signal AIN, the switch circuit SW2 is set to the terminal b (S23). As a result, similar to the analog signal dubbing described above,
Analog external input terminal 11 → SW2 → A / D converter 8 →
The signal path of the encoder 9 → SW3 → SW4 → magnetic head 4 is set. Also in this case, the data encoded by the encoder 9 is recorded on the DCC 5 (S18).

According to the DCC recording / reproducing apparatus of this embodiment, as shown in FIG. 5, when the original software of the DCC is used as the copy source recording medium, the SCMS set / cancel button 2
By the selection operation of No. 6, either copy or dubbing can be selected. When copying is selected, a copy-prohibited tape is created, but there is almost no deterioration in sound quality. When dubbing is selected, a copy-enabled tape can be created with some sound quality deterioration. Further, according to the DCC recording / reproducing apparatus of this embodiment,
The discrimination circuit 1 determines whether the copy source recording medium is copy-enabled software or copy-inhibited software. Even if the copy-source recording medium is copy-inhibited software, dubbing is automatically performed as shown in FIG. Although there is a deterioration in sound quality, a copyable tape can be created.

As a result, in the conventional SCMS digital recording device, as shown by the dotted line in FIG. 7, only the tape corresponding to the "child" can be created from the original software, and Although a corresponding tape could not be created, a "grandchild" tape can be created by two methods, copy + dubbing or dubbing + copy. Dubbing can be repeated many times. Further, in the double cassette type DCC recording / reproducing apparatus, the reproduced analog signal is encoded without passing through the cable even in the dubbing process, so that the deterioration of the sound quality is not so noticeable. Also,
Since the digital data subjected to data compression is copied without going through expansion processing (decoding processing), deterioration of sound quality is small. Although the double cassette type has been described in the embodiment, the digital input / output terminal shown in FIG. 1 as a single cassette type may be an external terminal. In this way, digital data compressed between a plurality of decks is not converted into another format, and a copy with little deterioration can be made in the same format. If necessary, a terminal for inputting and outputting uncompressed digital data may be provided as shown by a dotted line in FIG. In this way, the input / output signal form can be appropriately selected.

In the above embodiment, DCC is taken as an example, but copying from CD, DAT, MD or CD, DA
It goes without saying that the present invention can be similarly applied to copying to T and MD. The digital data to be recorded and reproduced is not limited to audio data, but may be other digital data such as video.

[0025]

As described above, according to the present invention,
There is an effect that a desired number of dubbing tapes can be easily created with the same feeling as in a conventional analog recording apparatus without impairing the basic concept of the SCMS system.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing an example of an operation panel in the device.

FIG. 3 is a flowchart showing an operation of the apparatus at the time of reproduction.

FIG. 4 is a flowchart showing an operation of the apparatus at the time of recording.

FIG. 5 is a diagram for explaining a form of copying from original software using the apparatus.

FIG. 6 is a diagram illustrating a form of copying from non-copyable software using the apparatus.

FIG. 7 is a diagram for explaining a method of generating a grandchild tape from original software using the device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Judgment circuit, 2 ... System controller, 3 ... Operation panel, 4 ... Magnetic head, 5 ... DCC, 6 ... Decoder, 7
... D / A converter, 8 ... A / D converter, 9 ... Encoder,
10 digital input terminal, 11 analog external input terminal, 12 analog external output terminal, 13 digital output terminal, SW1, SW2, SW3, SW4 switch circuit.

Claims (1)

(57) [Claims] 1. A poor the digital data from the copy source recording medium which digital data is recorded to the copy destination recording medium
A digital recording device having a function of restricting copying in a form with little change in digital data read out from the copy source recording medium and copying the digital data to the copy destination recording medium in a form with little deterioration . And digital data read from the copy source recording medium and inputting the digital data to the first medium.
A selection means for allowing the user to arbitrarily select any one of the second medium copying methods for recording on the copy destination recording medium in a form having a greater deterioration than the body copy method, and a method for storing the second medium copy method in the copy source recording medium Digital data before
The copying by the first medium copying method is prohibited.
Determining means for determining whether or not the digital data read from the copy source recording medium is input, decoded, and then re-encoded;
Encoding means; and a first digit not passing through the decoding / encoding means.
Data and encoded by the decoding / encoding means.
And input the second digital data
A switching unit for outputting , a recording unit for recording digital data output from the switching unit on the copy destination storage medium, and a user selection by the selection unit and the determination unit.
Control means for switching the switching means based on the determination result
The first medium copying method is selected by the selecting means.
Is selected and the first medium is copied by the determination means.
If it is determined that the method is not prohibited,
Switch so that the switching means outputs the first digital data.
And the selection means selects the first medium copying method.
And the first medium copying method is selected by the determination means.
If it is determined that the law is prohibited,
Switching means for outputting the second digital data
The second medium copying method is selected by the selecting means.
Is turned off, regardless of the result of the determination by the determination means.
Switching means for outputting the second digital data
A digital recording device , comprising: a control unit for controlling .