MPEG data recorder having IEEE 1394 interface

• US 7,227,953 B2
• Filed: 05/10/2002
• Issued: 06/05/2007
• Est. Priority Date: 12/21/2001
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Shida, Tetsuro
• Primary Examiner(s): Barron, Jr.; Gilberto
• Assistant Examiner(s): HERRING, VIRGIL A
• Application Number:
  US10/141,947
• Publication Number:
  US 20030118180A1
• Time in Patent Office: 1,852 Days
• Field of Search: 380/200, 380/201, 380/203
• US Class Current: 380/203
• CPC Class Codes: H04N 2005/91328 the copy protection signal being a copy management signal, e.g. a copy generation management signal [CGMS]
• CPC Class Codes: H04N 5/775 between a recording apparatus and a television receiver
• CPC Class Codes: H04N 5/913 for scrambling ; for copy protection
• CPC Class Codes: H04N 9/7921 for more than one processing mode
• CPC Class Codes: H04N 9/8042 involving data reduction

Abstract

A copy-protected-state indicating MPEG-TS data output unit (3) holds a bit stream obtained by previously compressing and encoding image and/or audio data representing that recording desired by the user has ended in failure because the contents is copy-protected. When copy control information (V2) outputted from an IEEE 1394 interface (1) indicates a copy-protected state, a selecting unit (20) selects copy-protected-state indicating MPEG-TS data (V3) outputted from the copy-protected-state indicating MPEG-TS data output unit (3) and outputs it as to-be-recorded MPEG-TS data (V4). Thereby, the data (V3) is recorded.

Claims

1. An MPEG data selector comprising:

a digital interface having an input terminal receiving digital data which includes MPEG Transport Stream (MPEG-TS) data of digital contents and copy control information for use in preventing unauthorized copying of said digital contents, a first output terminal outputting said MPEG-TS data, and a second output terminal outputting a copy control signal, said digital interface extracting said MPEG-TS data from said digital data received, and detecting said copy control information from said digital data to generate said copy control signal indicating the contents of said copy control information;

a copy-protected-state indicating MPEG-TS data output unit holding copy-protected-state indicating MPEG-TS data and having an output terminal outputting said copy-protected-state indicating MPEG-TS data, said copy-protected-state indicating MPEG-TS data being obtained by previously compressing and encoding, in MPEG format, a message representing that said copy control information indicates a copy-protected state; and

an MPEG-TS data selecting unit having a first input terminal connected to said first output terminal of said digital interface, a second input terminal connected to said second output terminal of said digital interface, a third input terminal connected to said output terminal of said copy-protected-state indicating MPEG-TS data output unit, and an output terminal outputting to-be-recorded MPEG-TS data, said MPEG-TS data selecting unit selecting either said MPEG-TS data or said copy-protected-state indicating MPEG-TS data as said to-be-recorded MPEG-TS data according to the contents of said copy control information given by said copy control signal.

2. The MPEG data selector according to claim 1, wherein said MPEG-TS data selecting unit selects said MPEG-TS data as said to-be-recorded MPEG-TS data when said copy control information indicates a state other than said copy-protected state, and selects said copy-protected-state indicating MPEG-TS data as said to-be-recorded MPEG-TS data when said copy control information indicates said copy-protected state.

3. The MPEG data selector according to claim 2, wherein

a bit rate of said copy-protected-state indicating MPEG-TS data is preset to a minimum value of a plurality of bit rates adaptable for recording by an MPEG data recorder for recording said to-be-recorded MPEG-TS data on a predetermined recording medium.

4. The MPEG data selector according to claim 2, wherein there are at least first copy control information and second copy control information;

said copy-protected-state indicating MPEG-TS data output unit comprises a first copy-protected-state indicating MPEG-TS data output unit and a second copy-protected-state indicating MPEG-TS data output unit, said first copy-protected-state indicating MPEG-TS data output unit holding first copy-protected-state indicating MPEG-TS data which is obtained by previously compressing and encoding data representing said first copy control information in MPEG format, and having an output terminal outputting said first copy-protected-state indicating MPEG-TS data, said second copy-protected-state indicating MPEG-TS data output unit holding second copy-protected-state indicating MPEG-TS data which is obtained by previously compressing and encoding data representing said second copy control information in MPEG format, and having an output terminal outputting said second copy-protected-state indicating MPEG-TS data;

said third input terminal of said MPEG-TS data selecting unit comprises an input terminal connected to said output terminal of said first copy-protected-state indicating MPEG-TS data output unit, and another input terminal connected to said output terminal of said second copy-protected-state indicating MPEG-TS data output unit; and

said MPEG-TS data selecting unit selects said first copy-protected-state indicating MPEG-TS data as said to-be-recorded MPEG-TS data when said copy control information is said first copy control information, and selects said second copy-protected-state indicating MPEG-TS data as said to-be-recorded MPEG-TS data when said copy control information is said second copy control information.

5. An MPEG data recorder comprising:

an MPEG data selector including

a digital interface having an input terminal receiving digital data which includes MPEG-TS data of digital contents and copy control information for use in preventing unauthorized copying of said digital contents, a first output terminal outputting said MPEG-TS data, and a second output terminal outputting a copy control signal, said digital interface extracting said MPEG-TS data from said digital data received, and detecting said copy control information from said digital data to generate said copy control signal indicating the contents of said copy control information;

a copy-protected-state indicating MPEG-TS data output unit holding copy-protected-state indicating MPEG-TS data and having an output terminal outputting said copy-protected-state indicating MPEG-TS data, said copy-protected-state indicating MPEG-TS data being obtained by previously compressing and encoding, in MPEG format, a message representing that said copy control information indicates a copy-protected state; and

an MPEG-TS data selecting unit having a first input terminal connected to said first output terminal of said digital interface, a second input terminal connected to said second output terminal of said digital interface, a third input terminal connected to said output terminal of said copy-protected-state indicating MPEG-TS data output unit, and an output terminal outputting to-be-recorded MPEG-TS data, said MPEG-TS data selecting unit selecting either said MPEG-TS data or said copy-protected-state indicating MPEG-TS data as said to-be-recorded MPEG-TS data according to the contents of said copy control information given by said copy control signal; and

a signal recording device recording said to-be-recorded MPEG-TS data outputted from said MPEG data selector on a predetermined recording medium.

6. The MPEG data recorder according to claim 5, wherein said signal recording device sets a predetermined time limit for recording of said copy-protected-state indicating MPEG-TS data on said predetermined recording medium when said to-be-recorded MPEG-TS data is said copy-protected-state indicating MPEG-TS data, said predetermined time limit being determined based on the amount of time that a user, at the time of playback, will be able to recognize that said MPEG-TS data extracted from said digital data could not be recorded because said copy control information indicates said copy-protected state.

7. The MPEG data recorder according to claim 5, wherein said signal recording device, after performing a format conversion of said to-be-recorded MPEG-TS data into D-VHS format data, records said D-VHS format data on said predetermined recording medium, and said signal recording device, when said to-be-recorded MPEG-TS data is said copy-protected-state indicating MPEG-TS data, detects whether information about the number of screens for trickplay data for high-speed search generated at the time of said format conversion coincides with a specific number of screens which has been held in said signal recording device, and when they coincides with each other, said signal recording device stops recording of said copy-protected-state indicating MPEG-TS data on said predetermined recording medium, said specific number of screens being determined based on the number of screens that the user, at the time of high-speed search playback, will be able to recognize that said MPEG-TS data extracted from said digital data could not be recorded because said copy control information indicates said copy-protected state.

8. An MPEG data selector comprising:

an IEEE 1394 interface receiving digital data in isochronous packet form;

a read only memory holding copy-protected-state indicating MPEG-TS data which is obtained by previously compressing and encoding, in MPEG format, a message representing that copy control information contained in said digital data indicates a copy-protected state; and

a signal selection switch having a first input terminal receiving MPEG-TS data extracted from said digital data and outputted from said IEEE 1394 interface, a second input terminal receiving said copy-protected-state indicating MPEG-TS data outputted from said read only memory, and an output terminal outputting to-be-recorded MPEG-TS data, said signal selection switch connecting said first input terminal to said output terminal when said copy control information extracted from said digital data and outputted from said IEEE 1394 interface indicates a state other than said copy-protected state, and connecting said second input terminal to said output terminal when said copy control information indicates said copy-protected state.