MPEG data recorder having IEEE 1394 interface
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorTetsuro Shida
Life of this patent
Estimating the term…
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.
Claims8
An MPEG data selector comprising:
- 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, data 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.
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, data 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.
Dependencies are inferred from the claim text.