JP2002318589A - Compressed signal recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size and the power consumption of a device for recording and reproducing compressed signals based on copyright information. SOLUTION: An electronic watermark detector 4 is provided in a reproducing device 1 to detect copyright information. Based on the information, a controller 5 conducts controls such as prohibiting the outputting of data to a recording and reproducing device 6, In the device 6, a DSP 8 reads an instruction code for data compression from an instruction memory 9 based an the output of a connection detecting means 7 during a recording (a connection period) and conducts data compression. A ciphering device 10 performs a ciphering of the compressed data and stores the data into a storage device 11. During data reproducing, the means 7 reads an instruction code for data expansion from the memory 9 and transmits the code to the DSP 8 regardless of the presence or the absence of the device 1. Then, the DSP 8 conducts an expansion process of the data in the device 11 being decoded by the device 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an apparatus for recording and reproducing data-compressed signals, and more particularly to a compressed signal recording and reproducing apparatus for recording and reproducing copyrighted works.

[0002]

2. Description of the Related Art In recent years, a digital watermarking method has been proposed as a copyright management method for a copyrighted work using digital data. As shown in FIG. 3, there is known a compressed signal recording / reproducing apparatus for compressing and recording a copyrighted work in such a manner.

A literary work such as music is recorded on a recording medium 2. Here, a compact disc or a mini disc is assumed. Further, as the recording device 11 as a recording destination, a semiconductor memory such as a flash memory or a memory card is assumed.

First, at the time of recording in the storage device 11, the reading device 3 reads music data from the recording medium 2, and the digital watermark detector 4 reads (detects) copyright information included in the music data. Based on this copyright information,
If copying is possible, the control device 5 outputs the music data to a digital signal processing device (hereinafter referred to as DSP) 8. The DSP 8 reads an instruction code for data compression from the instruction memory 9 and compresses music data. The compressed music data is encrypted by the encryption device 10 and written to the storage device 11.

Next, when reproducing the data written in the storage device 11, the encryption device 10 reads the data from the storage device 11, decrypts the data, and outputs it to the DSP 8.
The DSP 8 reads the instruction code for data expansion from the instruction memory 9 and decodes it into music data. This data is output to a D / A converter (DAC) 12 and output as an analog music signal from the recording / reproducing means 30.

[0006]

However, the above configuration requires the DSP 8 together with the digital watermark detector 4. Normally, digital watermark detection is performed using advanced digital signal processing, and therefore requires a high-performance DSP. Therefore, two high-performance DSPs are required to write a copyrighted work into a storage device, which increases the cost of the device. In addition, when data is reproduced from the storage device 11, the digital signal processing device (DSP) and the reading device 3 used in the digital watermark detector 4 become completely unnecessary, and expensive devices are wasted. There were challenges.

The present invention has been made in view of the above problems, and provides a compressed signal recording / reproducing apparatus in which an increase in cost is minimized.

[0008]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention comprises a reproducing device, a storage device, and a recording / reproducing device. The reproducing device comprises a reading device for reading copyrighted data from a storage medium. A copyright information detector for detecting copyright information from the copyrighted work data, and control means for controlling the output of the copyrighted work data to the recording / reproducing apparatus based on the copyright information. A connection detecting means for detecting a connection state to the device, a digital signal processing device for compressing and expanding data of an input signal, and an instruction memory for storing an instruction code for performing data compression data expansion on the digital signal processing device. A writing / reading unit for writing / reading data to / from the storage device, and connected to the reproducing device based on the output of the connection detecting unit,
When copyrighted data is given from the playback device, the digital signal processing device reads the instruction code for data compression from the instruction memory, performs data compression on the copyrighted data, and outputs it to the writing / reading means. When the reproduction device is not connected or the copyrighted data is not supplied from the reproduction device, the writing / reading unit reads the stored content from the storage device, and the digital signal processing device reads the instruction code for data expansion from the instruction memory. The data is expanded after being stored and output.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first invention of the present invention comprises a reproducing device, a storage device, and a recording / reproducing device, wherein the reproducing device reads a copyrighted work data from a storage medium; A copyright information detector that detects copyright information from product data, and a control unit that controls output of the copyrighted work data to the recording / reproducing device based on the copyright information. A connection detecting means for detecting a connection state to the playback apparatus, a digital signal processing apparatus for compressing and expanding data of an input signal, and an instruction code for performing data compression data expansion on the digital signal processing apparatus. And a write / read means for writing / reading data to / from the storage device. When the digital signal processing device is connected to the playback device and is provided with copyrighted data from the playback device, the digital signal processing device reads a data compression instruction code from the instruction memory and performs data compression on the copyrighted data. , Output to the writing / reading means, and when not connected to the reproducing apparatus or when no copyrighted data is given from the reproducing apparatus, the writing / reading means reads the stored content from the storage apparatus, A signal processing device reads out the instruction code for data expansion from the instruction memory, expands the stored content, and outputs the data. Thus, when the copyrighted data is compressed into the storage device and written to the storage device, the copyright information detector detects the copyright information, and if the copy is prohibited by the copyright information, the control means The copyrighted work data is prohibited from being output from the playback device, and a copy is prevented from being made. If the copying is not prohibited, the copyrighted data is output to the recording / reproducing device, and the digital signal processing device compresses the copyrighted data based on the output of the connection detecting means, and writes the compressed data to the storage device via the writing / reading means. Write to. Also, when it is desired to reproduce the data stored in the storage device, the reproduction device becomes unnecessary, the read / write means reads the compressed copyrighted work data from the storage device, and the digital signal processing device reads the compressed copyrighted work data. Of the original copyrighted work data and output the original copyrighted work data.

According to a second aspect of the present invention, in the first aspect, the reproducing apparatus has an authentication means for verifying that the recording / reproducing apparatus is a recording / reproducing apparatus having a predetermined function. The control means controls the output of the copyrighted work data based on the verification result and the copyright information. This has the effect of performing copyright protection by outputting copyrighted data from the playback device only when the recording / playback device has a copyright protection function.

In a third aspect of the present invention based on the first aspect, the connection detecting means has means for verifying that the reproducing apparatus is a recording / reproducing apparatus having a predetermined function, The reading of the instruction code for data compression from the instruction memory based on the output of the means is prohibited. This has the effect of prohibiting writing to the storage device if the playback device does not have the function of detecting copyright information.

According to a fourth aspect of the present invention, a copyrighted work data is read from a first recording medium and connected to a reproducing apparatus for controlling output of the copyrighted work data based on copyright information of the copyrighted work data. A connection detection unit for detecting a connection state with the playback device, a digital signal processing unit for performing data compression / decompression of an input signal from the playback device, and data to the digital signal processing unit. An instruction memory for storing an instruction code for performing compression or data decompression; and write / read means for writing / reading data to / from a second recording medium. Connected to a device and when the reproduction device is provided with copyrighted data, the digital signal processing means A command code for data compression is read from the memory, the data is compressed for the copyrighted data, and the compressed data is output to the writing / reading means. The reproducing device is not connected or the copyrighted data is not given from the reproducing device. At the time, the writing / reading means reads the stored content from the second storage medium, the digital signal processing means reads a data expansion instruction code from the instruction memory, and performs data expansion on the stored content. Output. This allows
Even if an attempt is made to compress the copyrighted work data and write it to the second recording medium, if the copy is prohibited by the copyright information, the copyrighted work data is not input, so that it is possible to prevent unauthorized copying. If the copy is not prohibited, the copyrighted data is input, the digital signal processing means compresses the copyrighted data based on the output of the connection detecting means, and the second data is written through the writing / reading means.
To the storage medium. Further, when it is desired to reproduce the data stored in the second storage medium, the reproducing apparatus is not required, and the read / write means reads the compressed copyrighted work data from the second storage medium, and the digital signal processing means This has the effect of decompressing the copyrighted work data and returning it to the original work data for output.

According to a fifth aspect of the present invention, in addition to the fourth aspect, the reproducing apparatus verifies whether or not the apparatus for outputting copyrighted data has a predetermined function. The output control of the copyrighted work data is performed based on copyright information. This has the effect that the playback device performs copyright protection by outputting the copyrighted data only when the device that outputs the copyrighted data has a copyright protection function.

According to a sixth aspect of the present invention, in addition to the fourth aspect, the connection detecting means verifies whether the playback device has a predetermined function, and based on the verification result, the instruction It controls reading of an instruction code for data compression from the memory. This allows
If the playback device does not have a function of detecting copyright information, it has the effect of prohibiting writing to the second storage medium.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing a configuration of a compressed signal recording / reproducing apparatus according to the present invention. In addition,
In this figure, components having the same functions as those in FIG. 3 are denoted by the same reference numerals, and detailed description is omitted.

Referring to FIG. 1, the compressed signal recording / reproducing apparatus of the present invention is mainly composed of a reproducing apparatus 1 and a recording / reproducing apparatus 6. In the first to third inventions, the playback device 1
And the recording / reproducing device 6 as a compression signal recording / reproducing device. In the fourth to sixth inventions, only the recording / reproducing device 6 is a compressed signal recording / reproducing device. The reproducing device 1 and the recording / reproducing device 6 are configured to be separable.

First, the copyrighted work data (hereinafter referred to as music data) recorded on the recording medium 2 is stored in the storage device 11.
, The reading device 3 reads music data from the recording medium 2, and the digital watermark detector 4 reads copyright information included in the music data. If copying is possible based on this copyright information, the control device 5 outputs music data to the recording / reproducing device 6. If the copy is prohibited by the copyright information, the output to the recording / reproducing device 6 is not performed. In the recording / reproducing device 6, the connection detecting means 7 detects whether or not the reproducing device 1 is outputting data to the recording / reproducing device 6, selects an instruction code for data compression from the instruction memory 9, and sends it to the DSP 8 give. The DSP 8 compresses music data in accordance with a data compression instruction code provided from the instruction memory 9. The compressed music data is encrypted by the encryption device 10 and written to the storage device 11.

Next, when the data written in the storage device 11 is reproduced, the copyrighted work data is not output from the reproduction device 1 (or the reproduction device 1 is not connected).
Therefore, the instruction code for data expansion is read from the instruction memory 9 by the connection detecting means 7 and the DSP 8
Given to. As a result, the DSP 8 requests the encryption device 10 for music data. The encryption device 10 reads the encrypted data from the storage device 11 and decrypts the data.
The music data is decoded into plaintext compressed music data and output to the DSP 8. The DSP 8 decompresses the compressed music data and decodes it into music data. This data is D
The signal is output to an A / A converter (DAC) 12 and output as an analog music signal from the recording / reproducing means 6.

As described above, the provision of the connection detecting means 7 allows the reproducing apparatus 1 and the recording / reproducing apparatus 6 to be used separately during reproduction, and the music data can be stored in the storage device 11 without using the reproducing apparatus 1 at all. Reproduction becomes possible. Also,
If the recording / reproducing device 6 is connected to the reproducing device 1, the copyrighted data based on the copyright information can be stored in the storage device 11 as before. As described above, the digital watermark detector 4 and the DSP 8 require a high-performance digital signal processing device, and naturally consume a lot of power. Since the digital watermark detector 4 is not required at the time of reproduction, the power consumed by the digital watermark detector 4 is not required, the power consumption of the recording / reproducing device 6 can be reduced, and the digital signal processing device requires only the DSP 8 to reduce the size. It becomes possible.

(Embodiment 2) FIG. 2 is a block diagram showing a configuration of a recording / reproducing apparatus according to Embodiment 2 of the present invention. In this figure, components having the same functions as those in FIGS. 1 and 3 are denoted by the same reference numerals, and detailed description thereof will be omitted. Hereinafter, FIG. 2 will be described.

The reproducing apparatus 20 of the present embodiment is obtained by adding an authentication means 21 to the reproducing apparatus 1 shown in FIG. The device, that is, a recording / reproducing device having a copyright protection function is checked here.
As an authentication method, for example, a random number is generated and output to the connection detecting means 24, and the connection detecting means 24 converts this value according to a predetermined rule and returns it to the authentication means 21, and the authentication means 21 predicts the value. To check whether the values match. If there is no such confirmation (confirmation of the presence or absence of the predetermined function) from the authentication unit 21, the connection detection unit 24 prohibits the instruction memory 9 from outputting the data compression instruction code. I have.

With such a configuration, the reproducing apparatus 20 prohibits a recording apparatus having no copyright protection function from outputting music data read from the recording medium 2, and the recording / reproducing apparatus Reference numeral 23 denotes a storage device 1 for storing music data from a device other than a device having a function of detecting copyright information.
1 can be prohibited from being recorded. Moreover, as in FIG. 1, the reproducing device 20 and the recording / reproducing device 23 can be used separately, and during reproduction, music data can be reproduced from the storage device 11 only by the recording / reproducing device 23. And power saving can be achieved.

In the above description, the encryption device 10 is used as the read / write means. However, the present invention is not limited to this. If encryption is unnecessary, the encryption device 10 is a normal interface to the storage device 11. It goes without saying that it is good.

In the above embodiment, the recording medium 2 is not limited to an optical disk, but may be a hard disk or a semiconductor memory. The copyrighted work data recorded on these is not limited to music data. It may be video data or other data. Further, the storage device 11 is not limited to a semiconductor memory or a memory card.

[0026]

As described above, according to the present invention, a reproducing apparatus has a copyright information detector for detecting copyright information from copyrighted data, and records and reproduces copyrighted data based on the copyright information. When the recording / reproducing apparatus is provided with the copyrighted data from the reproducing apparatus based on the output of the connection detecting means, the digital signal processing apparatus sends an instruction code for data compression from the instruction memory. Is read, and data compression is performed on the copyrighted work data. When the copyrighted data is not connected to the playback device or when no copyrighted data is given from the playback device, the digital signal processing device reads the data for expansion from the instruction memory. By reading the instruction code and expanding the data read from the storage device, the hardware Can be the same as in the reproducing and recording, the effect is obtained that keep to a minimum the load at the time of reproduction.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a compressed signal recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a compressed signal recording / reproducing apparatus according to the second embodiment;

FIG. 3 is a block diagram showing a configuration of a conventional compressed signal recording / reproducing apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 playback device 4 digital watermark detector 5 control device 7 connection detection means 8 digital signal processing device 9 instruction memory 10 encryption device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) G11B 20/10 301 G10L 9/18 H 9/00 NF term (reference) 5B017 AA06 BA09 CA09 CA16 5D044 AB05 AB07 BC01 BC04 CC04 DE50 FG18 GK08 HL02

Claims (6)

[Claims] 1. A reproducing apparatus comprising: a reproducing device; a storage device; and a recording / reproducing device, wherein the reproducing device reads a copyrighted data from a storage medium, and a copyright that detects copyright information from the copyrighted data. An information detector, and control means for controlling output of the copyrighted work data to the recording / reproducing device based on the copyright information, wherein the recording / reproducing device determines a connection state to the reproducing device. A connection detecting means for detecting, a digital signal processing device for compressing / expanding data of an input signal, an instruction memory storing an instruction code for performing data compression / data expansion on the digital signal processing device, and Writing and reading means for writing and reading data to and from the playback apparatus based on the output of the connection detection means. When the copyrighted data is given, the digital signal processing device reads an instruction code for data compression from the instruction memory,
Data compression is performed on the copyrighted work data, and the compressed data is output to the writing / reading unit. When the copyrighted data is not connected to the reproducing device or the copyrighted data is not given from the reproducing device, the writing / reading unit performs the A compressed signal recording / reproducing device for reading out stored contents from a storage device, wherein the digital signal processing device reads out an instruction code for data expansion from the instruction memory, expands the stored contents and outputs the data. . 2. The reproducing apparatus has an authentication unit for verifying that the recording / reproducing device is a recording / reproducing device having a predetermined function, and the control unit is configured to perform the authentication based on the verification result and the copyright information. 2. The compressed signal recording / reproducing apparatus according to claim 1, wherein output control of copyrighted work data is performed. 3. The connection detecting means has means for verifying that the reproducing apparatus is a recording / reproducing apparatus having a predetermined function. Based on the output of the means, the connection memory detects a data compression instruction code from the instruction memory. 2. The compressed signal recording / reproducing apparatus according to claim 1, wherein reading is prohibited. 4. An apparatus connectable to a reproducing apparatus that reads copyrighted work data from a first recording medium and controls output of the copyrighted work data based on copyright information of the copyrighted work data, Connection detection means for detecting a connection state with the device;
Digital signal processing means for compressing / expanding data of an input signal from the playback apparatus; instruction memory for storing an instruction code for performing data compression / decompression on the digital signal processing means; and a second recording medium A writing / reading unit for writing / reading data to / from the digital camera, based on an output of the connection detecting unit, connected to the reproducing apparatus, and when copyrighted data is given from the reproducing apparatus, the digital The signal processing means reads the instruction code for data compression from the instruction memory, performs data compression on the copyrighted work data, outputs the compressed data to the writing / reading means, and is not connected to the reproducing apparatus or the reproduction apparatus performs the reproducing operation. When no object data is given, the writing / reading means Wherein the digital signal processing means reads out an instruction code for data expansion from the instruction memory, expands the data with respect to the storage content, and outputs the data. apparatus. 5. The reproduction device verifies whether a device for outputting copyrighted work data has a predetermined function, and controls the output of the copyrighted work data based on the verification result and the copyright information. 5. The compressed signal recording / reproducing apparatus according to claim 4, wherein: 6. The connection detection unit verifies whether the playback device has a predetermined function, and based on the verification result,
5. The compressed signal recording / reproducing apparatus according to claim 4, wherein reading of an instruction code for data compression from the instruction memory is controlled.