Method of transmitting data among a plurality of LSIs, and DVD-audio reproducing apparatus using the method
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsAkihisa Kawamura, Masatoshi Shimbo, Yoshihiro Mori
Life of this patent
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Abstract
There is provided a DVD-audio reproducing apparatus in which a digital signal immediately before being inputted to a D/A converting LSI is prevented from being taken out and unfairly copied. A digital signal processing LSI and the D/A converting LSI are connected to each other through an external bus. A scrambling processing circuit for scrambling a digital signal outputted from a digital signal processing circuit is provided inside the digital signal processing LSI. A descrambling processing circuit for descrambling the scrambled digital signal transmitted through the external bus is provided inside the D/A converting LSI.
Claims26
A method of transmitting, in a DVD-Audio reproducing apparatus comprising a digital signal processing LSI and a D/A converting LSI which are connected to each other through an external bus for reproducing a DVD-Audio disk, a digital signal from the digital signal processing LSI to the D/A converting LSI through the external bus, comprising the steps of:
- processing inside the digital signal processing LSI the digital signal which has been read out of the DVD-Audio disk;
- scrambling inside the digital signal processing LSI the digital signal which has been processed;
- transmitting the scrambled digital signal from the digital signal processing LSI to the D/A converting LSI through the external bus;
- descrambling inside the D/A converting LSI the scrambled digital signal transmitted through the external bus;
- and
- converting inside the D/A converting LSI the digital signal which has been descrambled into an analog signal.
A DVD-Audio reproducing apparatus for reproducing a DVD-Audio disk, comprising:
- a digital signal processing LSI comprising a digital signal processing means for processing a digital signal which has been read out of the DVD-Audio disk and a scrambling processing means for scrambling the digital signal outputted from said digital signal processing means;
- a D/A converting LSI comprising a descrambling processing means for descrambling the scrambled digital signal transmitted through said external bus and a D/A conversion means for converting the digital signal outputted from said descrambling processing means into an analog signal;
- and
- an external bus that connects said digital signal processing LSI to said D/A converting LSI.
A method of transmitting, in a DVD-Audio reproducing apparatus comprising a digital signal processor and a D/A converter which are connected to each other through an external bus for reproducing a DVD-Audio disk, a digital signal from the digital signal processor to the D/A converter through the external bus, comprising:
- processing inside the digital signal processor, the digital signal which has been read out of the DVD-Audio disk;
- scrambling inside the digital signal processor, the digital signal which has been processed;
- transmitting the scrambled digital signal from the digital signal processor to the D/A converter through the external bus;
- descrambling inside the D/A converter, the scrambled digital signal transmitted through the external bus;
- and
- converting inside the D/A converter, the digital signal which has been descrambled into an analog signal.
A DVD-Audio reproducing apparatus for reproducing a DVD-Audio disk, comprising:
- a digital signal processor comprising a digital signal processing portion for processing a digital signal which has been read out of the DVD-Audio disk and a scrambling processor for scrambling the digital signal outputted from said digital signal processing portion;
- a D/A converter comprising a descrambling processor for descrambling the scrambled digital signal transmitted through said external bus and a D/A conversion portion for converting the digital signal outputted from said descrambling processor into an analog signal;
- and
- an external bus that connects said digital signal processor to said D/A converter.
Dependencies are inferred from the claim text.