Repeater of digital audio interface signal

• US 5,144,658 A
• Filed: 11/20/1990
• Issued: 09/01/1992
• Est. Priority Date: 11/24/1989
• Status: Expired due to Term

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Takahashi, Ryutaro
• Primary Examiner(s): Tarcza, Thomas H.
• Assistant Examiner(s): CAIN, DAVID C
• Application Number:
  US07/616,067
• Time in Patent Office: 651 Days
• Field of Search: 380/3, 380/4, 380/23, 360/60, 360/68
• US Class Current: 360/60
• CPC Class Codes: G06F 2211/007 Encryption, En-/decode, En-/decipher, En-/decypher, Scramble, (De-)compress
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/00753 wherein the usage restriction limits the number of copies that can be made, e.g. CGMS, SCMS, or CCI flags
• CPC Class Codes: G11B 20/00768 wherein copy control information is used, e.g. for indicating whether a content may be copied freely, no more, once, or never, by setting CGMS, SCMS, or CCI flags
• CPC Class Codes: G11B 20/10527 Audio or video recording; Data buffering arrangements G11B20/12 - G11B20/18 take precedence
• CPC Class Codes: G11B 27/031 Electronic editing of digitised analogue information signals, e.g. audio or video signals

Abstract

A digital audio interface signal repeater capable of displaying how many generations a further copying of a digital audio interface signal is allowed includes: a receiving device for receiving a digital audio interface signal, a demodulator for demodulating predetermined information included in the received digital audio interface signal, and an information display device for displaying the demodulated information. The predetermined information included in the digital audio interface signal received by the receiving device is demodulated by the demodulator. The demodulated information is displayed by the information display device. Since the digital audio interface signal includes information regarding the allowed number of subsequent copying, necessary information such as the allowed number of copying of the digital audio interface signal being processed can be known by confirming a display on the information display device.

Claims

1. A digital audio interface signal repeater comprising:

means for receiving a digital audio interface signal;

means for demodulating predetermined information from the received digital audio interface signal;

means for determining whether the digital signal may be copied and if so, a number of copies which are permitted; and

information displaying means for displaying whether the digital signal may be copied, and if so, the number of copies which are permitted.

2. The digital audio interface signal repeater of claim 1, further comprising:

means for outputting whether the digital audio interface signal may be copied, and if so, the number of copies which are permitted to an external apparatus.

3. The digital audio interface signal repeater of claim 1, wherein said means for demodulating demodulates channel status information included in the digital audio interface signal.

4. The digital audio interface signal repeater of claim 3, wherein said channel status information includes a category code which assumes a plurality of values for indicating a category of a sound source of the digital audio interface signal;

and

said information displaying means includes,

category information storing means for restoring information associated with each of the plurality of values for the category code,

category information deriving means for deriving information associated with one of the plurality of values of the category code from said category information storing means, and

displaying means for displaying the information derived by said category code information deriving means.

5. The digital audio interface signal repeater of claim 3, wherein said channel status information includes a copy allowing/prohibiting signal, said copy allowing/prohibiting signal assuming one of a first and second value for indicating whether further copying of said digital audio interface signal is prohibited;

and

said information displaying means including,

means for detecting a value of said copy allowing/prohibiting signal, and

displaying means for displaying one of a first and second symbol in accordance with the first and second values of said copy allowing/prohibiting signal.

6. The digital audio interface signal repeater of claim 3, wherein said channel status information includes a copy allowing/prohibiting signal for indicating whether further copying of said digital signal is prohibited, and

category information for indicating a category of a sound source of said digital audio interface signal;

and

said information displaying means including,

means responsive to combinations of said copy allowing/prohibiting signal and said category information for determining a number of copies of the digital signal permitted, said number assuming one of a plurality of values in order to indicate how many times the digital signal may be copied, and

displaying means for displaying one of a plurality of different symbols in accordance with the one of the plurality of values.

7. The digital audio interface signal repeater of claim 6, wherein said means for outputting includes,

means for storing one of the plurality of values which indicates the allowed number of copies corresponding to each combination of said copy allowing/prohibiting signal and said category information, and

means responsive to said copy allowing/prohibiting signal and said category information for searching said means for storing so as to derive the one of the plurality of values corresponding to the combination of said copy allowing/prohibiting signal and said category information.

8. A digital audio interface signal repeater comprising:

an A/D converter for converting an externally applied analog signal into a digital audio interface signal;

means responsive to an operation of said A/D converter for outputting a predetermined signal;

modulating means for modulating the digital audio interface signal into a predetermined format in accordance with the predetermined signal;

means for determining whether the digital audio interface signal maybe copied and if so, a number of copies which are permitted; and

information displaying means for displaying whether the digital audio interface signal may be copied, and if so, the number of copies which are permitted in accordance with a value of said predetermined signal.

9. The digital audio interface signal repeater of claim 8, further comprising:

means for transmitting whether the digital audio interface signal may be copied, and if so, the number of copies which are permitted to an external apparatus.

10. The digital audio interface signal repeater of claim 8, said information displaying means including,

information storing means for storing predetermined information associated with each of a plurality of signals including said predetermined signal,

information deriving means responsive to said predetermined signal for deriving information associated with said predetermined signal from said information storing means, and

displaying means for displaying a symbol associated with said derived information.

11. A method for copying a digital signal comprising the steps of:

(a) receiving the digital signal;

(b) demodulating predetermined information from the received predetermined signal;

(c) determining whether the digital signal may be copied, and if so, a number of copies which are permitted; and

(d) displaying whether the digital signal may be copied, and if so, the number of copies which are permitted.

12. The method of claim 11, further comprising the step of:

(e) outputting whether the digital signal may be copied, and if so, the number of copies which are permitted.

13. The method of claim 11, wherein said stp (b) demodulates channel status information included in the digital signal.

14. The method of claim 13, wherein the channel status information includes a category code which assumes a plurality of values for indicating a category of a sound source o the digital signal;

and said step (d) includes,

(d) (1) prestoring information associated with each of the plurality of values for the category code,

(d) (2) deriving information associated with one of the plurality of values of the category code, and

(d)(3) displaying the information derived in step (d) (2).

15. The method of claim 13, wherein the channel status information includes a copy allowing/prohibiting signal, the copy allowing/prohibiting signal assuming one of a first and second value for indicating whether additional copies are permitted;

and

said step (d) including,

(d) (1) detecting a value of the copy allowing/prohibiting signal, and

(d) (2) displaying one of a first and second symbol corresponding to the first and second values assumable by the copy allowing/prohibiting signal.

16. The method of claim 13, wherein the channel status information includes a copy allowing/prohibiting signal for indicating whether additional copies are permitted, and category information for indicating a category of a sound source of the digital signal;

and

said step (d) including,

(d) (1) determining a number of copies of the digital signal which are permitted, based on the copy allowing/prohibiting signal and the category information, and

(d) (2) displaying one of a plurality of symbols corresponding to the determined number.

17. The method of claim 16, said step (e) including,

(e) (1) storing number of copies of the digital signal which are permitted for each combination of copy allowing/prohibiting signal and category information, and

(e) (2) searching each combination of copy allowing/prohibiting signal and category information, and retrieving a value representing a number of copies of the digital signal which are permitted based on the copy allowing/prohibiting signal and the category information contained in the channel status information of the digital signal.

18. A method of copying a digital signal comprising the steps of:

(a) converting an analog signal to the digital signal to be copied;

(b) outputting a predetermined signal based on the conversion in step (a);

(c) modulating the digital signal to be copied into a predetermined format in accordance with the predetermined signal;

(d) determining whether the digital signal may be copied, and if so, a number of copies which are permitted; and

(e) displaying whether the digital signal may be copied, and if so, the number of copies which are permitted.

19. The method of claim 18, further comprising the steps of:

(f) transmitting whether the digital signal may be copied, and if so, the number of copies which are permitted, to an external apparatus.

20. The method of claim 19, said step (e) including,

(e)(1) storing predetermined information associated with each of a plurality of signals including the predetermined signal,

(e) (2) deriving information associated with the predetermined signal;

(e) (3) displaying a symbol associated with the derived information.