Method and system for broadcasting digital audio and video to an analog wireless device

• US 6,577,354 B2
• Filed: 12/13/2001
• Issued: 06/10/2003
• Est. Priority Date: 05/04/1998
• Status: Expired due to Term

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Williams, Michael E., Geranen, Jack Scott, Cucuzella, Mathew, Reinold, Jurgen, Lee, Jeff, Knappenberger, David
• Primary Examiner(s): Harvey, David E.
• Application Number:
  US10/021,997
• Publication Number:
  US 20020138278A1
• Time in Patent Office: 544 Days
• Field of Search: H04/N.538, H04/5.44, H04/7.10, H04/7.22, H04/7.20, H04/7.167, H04/7.16, H04/7.13, 348/723, 348/724, 348/725, 725/153, 725/151, 725/68, 725/70, 380/42, 380/205, 370/110.1
• US Class Current: 348/723
• CPC Class Codes: H04H 20/08 among terminal devices
• CPC Class Codes: H04H 20/63 to plural spots in a confined site, e.g. MATV [Master Antenna Television]
• CPC Class Codes: H04H 60/80 characterised by transmission among terminal devices
• CPC Class Codes: H04N 21/426 Internal components of the client ; Characteristics thereof H04N5/44 takes precedence
• CPC Class Codes: H04N 21/43637 involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11] arrangements for wireless networking or broadcasting of information in indoor or near-field type systems H04B10/114
• CPC Class Codes: H04N 21/439 Processing of audio elementary streams
• CPC Class Codes: H04N 5/38 Transmitter circuitry for the transmission of television signals according to analogue transmission standards H04N5/14 takes precedence
• CPC Class Codes: H04N 5/602 for digital sound signals
• CPC Class Codes: H04N 7/1675 Providing digital key or authorisation information for generation or regeneration of the scrambling sequence pseudo-random number generators in general G06F7/58

Abstract

An audio input interface (122) receives a digital audio signal and identifies an audio bitstream which is optionally decrypted by a decryption unit (123), and decoded by an audio decoding unit (124). An audio digital to analog converter (126) converts the decoded audio bitstream to an analog audio signal which is optionally decrypted by an audio analog decryption unit (127). A video input interface (142) receives a digital video signal and identifies a video bitstream which is optionally decrypted by a video digital decryption unit (143), and decoded by a video decoding unit (144). A video digital to analog converter (146) converts the decoded video bitstream to an analog video signal that is optionally decrypted by a video analog decryption unit (147). An analog transmitter (150) mixes the analog audio signal and analog video signal and transmits an analog wireless output signal to an analog wireless device (110).

Claims

1. A system for broadcasting audio content of a digital audio signal to an analog wireless device, comprising:

an audio input interface receiving the digital audio signal from a plurality of sources and identifying an audio bitstream, wherein the audio bitstream comprises audio data based on a plurality of encoding methods corresponding to the plurality of sources;

an audio decoding unit connected to the audio input interface and decoding the audio bitstream;

an audio decryption unit connected to the audio input interface and decrypting only authorized audio content;

an audio digital to analog converter connected to the audio decoding unit and converting the audio bitstream to an analog audio signal; and

an analog transmitter connected to the audio digital to analog converter and transmitting the analog audio signal to the analog wireless device.

2. The system of claim 1, wherein the audio decryption unit comprises an audio digital decryption unit decrypting the audio bitstream.

3. The system of claim 1, wherein the audio decryption unit comprises an audio analog decryption unit decrypting the analog audio signal.

4. The system of claim 1 wherein the audio decryption unit employs copy protection so that only authorized devices can use the audio content.

5. The system of claim 1 wherein the audio decryption unit decrypts the audio content so that only authorized devices can use premium channels.

6. The system of claim 1 wherein the audio decryption unit decrypts the audio content so that only authorized devices can use pay-per-listen content.

7. The system of claim 1 wherein the audio decryption unit decrypts the audio content so that only authorized devices can use classified information.

8. A system for broadcasting video content of a digital video signal to an analog wireless device, comprising:

a video input interface receiving the digital video signal from a plurality of sources and identifying a video bitstream, wherein the video bitstream comprises video data based on a plurality of encoding methods corresponding to the plurality of sources;

a video decoding unit connected to the video input interface and decoding the video bitstream;

a video decryption unit connected to the video input interface and decrypting only authorized video;

a video digital to analog converter connected to the video decoding unit and converting the video bitstream to an analog video signal; and

an analog transmitter connected to the video digital to analog converter and transmitting the analog video signal to the analog wireless device.

9. The system of claim 8, wherein the video decryption unit comprises a video digital decryption unit decrypting the video bitstream.

10. The system of claim 8, wherein the video decryption unit comprises a video analog decryption unit decrypting the analog video signal.

11. The system of claim 8 wherein the video decryption unit employs copy protection so that only authorized devices can use the video content.

12. The system of claim 8 wherein the video decryption unit decrypts the video content so that only authorized devices can use premium channels.

13. The system of claim 8 wherein the video decryption unit decrypts the video content so that only authorized devices can use pay-per-view content.

14. The system of claim 8 wherein the video decryption unit decrypts the video content so that only authorized devices can use classified information.

15. A method for broadcasting audio content of a digital audio signal to an analog wireless device, comprising the steps of:

receiving the digital audio signal from a plurality of sources and identifying an audio bitstream, wherein the audio bitstream comprises audio data based on a plurality of encoding methods corresponding to the plurality of sources;

decoding the audio bitstream;

decrypting only authorized audio-content;

converting the audio bitstream to an analog audio signal; and

transmitting the analog audio signal to the analog wireless device.

16. The method of claim 15, wherein the step of decrypting only authorized audio content comprises decrypting the audio bitstream.

17. The method of claim 15, wherein the step of decrypting only authorized audio content comprises decrypting the analog audio signal.

18. The method of claim 15 wherein the step of decrypting only authorized audio content comprises employing copy protection so that only authorized devices can use the audio content.

19. The method of claim 15 wherein the step of decrypting only authorized audio content comprises decrypting the audio content so that only authorized devices can use premium channels.

20. The method of claim 15 wherein the step of decrypting only authorized audio content comprises decrypting the audio content so that only authorized devices can use pay-per-listen content.

21. The method of claim 15 wherein the step of decrypting only authorized audio content comprises decrypting the audio content so that only authorized devices can use classified information.

22. A method for broadcasting video content of a digital video signal to an analog wireless device, comprising the steps of:

receiving the digital video signal from a plurality of sources and identifying a video bitstream, wherein the video bitstream comprises video data based on a plurality of encoding methods corresponding to the plurality of sources;

decoding the video bitstream;

decrypting only authorized video content;

converting the video bitstream to an analog video signal; and

transmitting the analog video signal to the analog wireless device.

23. The method of claim 22, wherein the step of decrypting only authorized video content comprises decrypting the video bitstream.

24. The method of claim 22, wherein the step of decrypting only authorized video content comprises decrypting the analog video signal.

25. The method of claim 22 wherein the step of decrypting only authorized video content comprises employing copy protection so that only authorized devices can use the video content.

26. The method of claim 22 wherein the step of decrypting only authorized video content comprises decrypting the video content so that only authorized devices can use premium channels.

27. The method of claim 22 wherein the step of decrypting only authorized video content comprises decrypting the video content so that only authorized devices can use pay-per-view content.

28. The method of claim 22 wherein the step of decrypting only authorized video content comprises decrypting the video content so that only authorized devices can use classified information.