Digital recording device, digital reproduction device, digital recording/reproduction device, encryption device, decryption device, encryption method, and decryption method

A technology of digital recording and reproducing device, applied in the direction of digital recording/reproducing, data recording, recording signal processing, etc., can solve the problem that the encryption circuit or demodulation circuit cannot record or reproduce the program, etc.

Inactive Publication Date: 2006-07-05
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, when data encryption or demodulation (encryption release) becomes necessary due to a program change during recording or reproduction, a given time is required in the activation of the encryption circuit or demodulation circuit, so there is an encryption circuit or The problem that the program cannot be recorded or reproduced during the start-up time of the demodulation circuit

Method used

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  • Digital recording device, digital reproduction device, digital recording/reproduction device, encryption device, decryption device, encryption method, and decryption method
  • Digital recording device, digital reproduction device, digital recording/reproduction device, encryption device, decryption device, encryption method, and decryption method
  • Digital recording device, digital reproduction device, digital recording/reproduction device, encryption device, decryption device, encryption method, and decryption method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0030] figure 1 It is a system diagram of an embodiment of the digital recording device of the present invention. The digital recording signal encoded by the MPEG encoder 1 is input to the first data control circuit 2a. The first data control circuit 2a is controlled by CPU3 which is a recording signal processing circuit. Also, the first data control circuit 2a is electrically connected to a memory 4 (storage unit) which is a storage unit for storing digital signals, an encryption circuit 5 for encrypting digital signals, and an interface (I / F) 6 . The encryption circuit 5 is electrically connected to an encryption key generation circuit 7 that generates an encryption key necessary for validating the encryption circuit 5 . The first data control circuit 2a controls a DVD drive 8a which is a recording unit through an interface 6, and has both a recording function and a reproducing function. The mutual authentication circuit 9 is electrically connected to the interface 6 and ...

Embodiment 2

[0043] Fig. 3 is a system diagram of an embodiment of the digital playback device of the present invention. In Embodiment 2, compared with Embodiment 1, instead of the first data control circuit 2a, there is a second data control circuit 2b capable of outputting digital recording signals, and the DVD drive 8b instead of the DVD drive 8a is dedicated to reproduction, instead of encryption. The circuit 5 and the demodulation circuit 10 are electrically connected to the encryption key generation circuit 7 and the second data control circuit 2b. Like the encryption circuit 5, the demodulation circuit 10 becomes valid upon receiving the transmission of the encryption key from the encryption key generation circuit 7, and can demodulate the encrypted digital recording signal. In addition, instead of the MPEG encoder 1 of the first embodiment, the MPEG decoder 11 is electrically connected to the second data control circuit 2b, and the digital recording signal is decoded by the MPEG de...

Embodiment 3

[0050] In recent years, the recording and reproduction bit speeds of DVD drives have been improved, and simultaneous recording and reproduction can be performed on the same disc. There are times when a program being recorded is played back, and when a program different from the currently recorded program is played back. When playing back a program different from the recorded program, it is considered that the recording of the program that does not need to be encrypted is started first, and then the playback of the encrypted program is performed.

[0051] Fig. 5 is a system diagram showing an embodiment of the digital recording and reproducing apparatus of the present invention. Compared with Embodiment 1, the first data control circuit 2a is replaced by a third data control circuit 2c capable of inputting and outputting digital recording signals and having both functions of the first data control circuit 2a and the second data control circuit 2b, The DVD drive 8a is replaced ...

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Abstract

A digital recording device includes a data control circuit (2a), a memory (4), an encryption circuit (5), an interface (6), a DVD drive (8), and a CPU (3). When encryption is required during recording, data is temporarily accumulated in the memory (4). After the encryption circuit (5) is validated, the data is encrypted and recording of the DVD drive (8) to a recording medium is resumed. Thus, it is possible to operate the encryption circuit only when recording a program requiring a content protection and perform recording or reproduction from the required timing without interrupting the recording or reproduction even when the encryption circuit is in operation.

Description

technical field [0001] The invention relates to a digital recording device, a digital reproducing device, a digital recording and reproducing device, an encryption device, a demodulation device, an encryption method and a decryption device for recording or reproducing image information, sound information and other data in a hard disk, an optical disc, and a memory. tune method. Background technique [0002] When recording image signals from a TV tuner and video camera, the operator operates the record button from the desired moment, but a given time is required in the start of the digital recording device, so after a given time has elapsed since the operation of the record button , to start recording. In order to avoid this problem, there is a method of temporarily recording the image signal in the memory before the activation is completed, and recording the data in the memory on the recording medium after the activation is completed. (refer to patent document 1) [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/10G06F12/14G09C1/00H04N5/91G06F21/60G06F21/62G06F21/72G11B20/00H04N5/85H04N5/913H04N9/804
CPCG11B20/00086H04N5/85H04N2005/91364G11B20/0021G11B20/00188G11B2020/10944G11B2020/10814G11B2020/10805G11B2020/10962G11B2020/10675G11B2020/10759H04N9/8042G11B20/00768H04N5/913G11B20/10527G11B20/00297
Inventor 龙智明
Owner MITSUBISHI ELECTRIC CORP
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