Granted Patent B2

US 7,801,178 · App. 12/046,684 · Granted Sep 21, 2010

Abstract

Claims (34)

1. A transmitter conforming to IEEE 1394 for transmitting a plurality of audio data contents, comprising:

an audio data generator configured to sample the plurality of audio data contents sequentially to generate format data of an audio data content, each of the plurality of audio data contents corresponding to a plurality of channels;

a transmission controller configured to add a header packet to the format data of the audio data content; and

an encryption portion configured to encrypt data corresponding to each of the plurality of channels based on an encryption instruction signal indicating a level for the encryption corresponding to each of the plurality of channels.

2. The transmitter according to claim 1 , further comprising:

a phase-locked loop configured to generate a common clock for receiving the plurality of audio data content.

3. The transmitter according to claim 1 , further comprising:

an encryption portion configured to encrypt the format data of the audio data content.

4. The transmitter according to claim 3 , wherein the encryption portion encrypts the format data of the audio data content using 5C-DTCP protocol.

5. The transmitter according to claim 1 , wherein the level for the encryption is one selected from a group consisting of copy-free, copy-one-generation, and copy-never.

6. The transmitter according to claim 1 , further comprising:

a label generator configured to generate a label for generating the format data of the audio data content.

7. An receiver conforming to IEEE 1394, comprising:

a reception controller configured to separate format data of an audio data content from a received packet;

an audio data content generator configured to generate a plurality of audio data contents from the separated format data of an audio data content on the basis of audio data content separation information, each of the plurality of audio data contents corresponding to a plurality of channels; and

a decryption portion configured to decrypt data corresponding to each of the plurality of channels based on a signal indicating a level for decryption corresponding to each of the plurality of channels.

8. The receiver according to claim 7 , further comprising:

a phase-locked loop configured to generate a common clock for transmitting the plurality of audio data content.

9. The receiver according to claim 7 , further comprising:

a second determination portion configured to determine whether a label included in the separated format data of the audio data content has a predetermined value.

10. The receiver according to claim 7 , further comprising:

a plurality of decryption portions configured to decrypt the separated format data of the audio data content; and

a selector portion configured to select signals from the plurality of decryption portions.

11. An audio data content transmission method conforming to IEEE 1394, comprising:

separating format data of an audio data content from a received packet;

generating a plurality of audio data contents from the separated format data of an audio data content on the basis of audio data content separation information, each of the plurality of audio data contents corresponding to a plurality of channels;

decrypting data corresponding to each of the plurality of channels based on a signal indicating a level for decryption corresponding to each of the plurality of channels; and

transmitting the plurality of audio data contents.

12. The audio data content transmission method according to claim 11 , wherein the plurality of audio data contents are output on the basis of a common clock signal generated by a phase-locked loop.

13. The audio data content transmission method according to claim 11 , further comprising:

decrypting a first separated format data of audio data content into a first decrypted format data of audio data content according to a first encryption level;

decrypting a second separated format data of audio data content into a second decrypted format data of audio data content according to a second encryption level;

selecting from a group consisting of the first decrypted format data of the audio data content and the second decrypted format data of the audio data content; and

generating the plurality of audio data contents.

Assignments (9)