Digital remodulation

• US 20060126716A1
• Filed: 12/15/2004
• Published: 06/15/2006
• Est. Priority Date: 12/15/2004
• Status: Abandoned Application

• Current Assignee: Sirius XM Radio Inc. (Liberty Media Corporation)
• Original Assignee: XM Satellite Radio Incorporated (Liberty Media Corporation)
• Inventors: Marko, Paul, Wadin, Craig, Williams, Wendi
• Application Number:
  US11/012,579
• Publication Number:
  US 20060126716A1
• Time in Patent Office: Days
• US Class Current: 375/240
• CPC Class Codes: H04H 20/02 Arrangements for relaying broadcast information
• CPC Class Codes: H04H 20/62 for transportation systems, e.g. in vehicles
• CPC Class Codes: H04H 2201/183 FM digital or hybrid
• CPC Class Codes: H04H 40/90 specially adapted for satellite broadcast receiving

Abstract

A method (30) of digital remodulation of a received or source signal using a digital audio radio (116) having a first digital radio frequency path (119 to 116) or using a first digital radio frequency comprises the steps of re-encoding (38) the received signal to provide a re-encoded digital signal, reformatting (40) the re-encoded digital signal into a new digital format signal, and digitally modulating (42) a radio frequency carrier with the new digital format signal. The method further comprises the step of selectively switching (42) a radio frequency path of the digital audio radio from the first digital radio frequency path to a second radio frequency path (114 to 116) or from the first digital radio frequency to a second digital radio frequency having the radio frequency carrier with the new digital format signal.

Claims

1. A method of digital remodulation of a received signal using a digital audio radio and a first digital radio frequency, comprising the steps of:

re-encoding the received signal to provide a re-encoded digital signal;

reformatting the re-encoded digital signal into a new digital format signal;

digitally modulating a radio frequency carrier with the new digital format signal; and

selectively switching the digital audio radio from the first digital radio frequency to a second radio frequency having the radio frequency carrier with the new digital formal signal.

2. The method of claim 1, wherein the method further comprises the step of receiving the new digital format signal at the digital audio radio.

3. The method of claim 1, wherein the method further comprises the step of receiving the received signal in a, format of a digital transmission signal, extracting a channel of encoded information, and decoding a the channel of encoded information before the step of re-encoding.

4. The method of claim 1, wherein the method further comprises the step of receiving the received signal in a format of a satellite digital audio radio transmission signal, extracting a channel of encoded audio, and decoding the channel of encoded audio before the step of re-encoding.

5. The method of claim 1, wherein the method further comprises the step of receiving the received signal in a format of a satellite digital audio radio transmission signal, extracting a compressed channel of encoded audio, and decompressing the compressed channel of encoded audio before the step of re-encoding.

6. The method of claim 1, wherein the method further comprises the step of receiving the received signal in a format of a satellite digital audio radio transmission signal, extracting a channel having a compressed digital audio signal and associated data from the satellite digital audio radio transmission signal, and decompressing the compressed digital audio signal and associated data.

7. The method of claim 6, wherein the step of re-encoding comprises the step of re-encoding only the decompressed digital audio radio signal to provide the re-encoded digital audio signal and the step of reformatting comprises the step of reformatting the re-encoded digital audio radio signal and the associated data.

8. The method of claim 3, wherein the step of receiving the received signal comprises the step of receiving a digital stream generated from an auxiliary audio source selected from the group comprising an MP3 player, a compact disc player, a digital video disc player, a tape cassette player, and a satellite digital audio radio receiver.

9. A method of providing an audio signal from an auxiliary source to a digital radio receiver for playback in lieu of a digital broadcast signal received at the digital radio receiver comprising the steps of:

reformatting the audio signal into a digital audio format compatible with the digital broadcast signal;

modulating the reformatted audio signal onto a radio frequency to which the radio receiver can be tuned, for transmission via a conductor; and

providing the modulated reformatted audio signal to an antenna switch unit via the conductor, the antenna switch unit also being connected to an antenna for receiving the broadcast signal.

10. The method of claim 9, wherein the method further comprises the steps of detecting when said reformatted modulated audio signal is being provided to said antenna switch unit and operating a switch to provide said reformatted modulated audio signal to said radio receiver in response to said reformatted modulated audio signal being detected at said antenna switch unit and to provide said broadcast signal to said radio receiver when said reformatted modulated audio signal is not detected.

11. A method as claimed in claim 10, wherein said detecting step comprises the step of detecting when said reformatted modulated audio signal provided to said antenna switch unit exceeds a predetermined voltage level, and said operating step comprises the step of providing said radio receiver said broadcast signal when said reformatted modulated audio signal is below said predetermined voltage level.

12. An apparatus for providing audio signals from an auxiliary source to a digital audio radio receiver, said digital audio radio receiver receiving a digital broadcast signal via an antenna, the apparatus comprising:

an encoder for encoding the audio signals from the auxiliary source to provide a re-encoded signal;

a formatter for formatting the re-encoded signal into a digital audio format compatible with the digital broadcast signal providing a reformatted digital audio signal; and

a modulator unit for modulating the reformatted digital audio signal onto a radio frequency to which said digital audio radio receiver can be tuned.

13. The apparatus of claim 12, wherein the apparatus further comprises:

an antenna switch unit having an output connected to said digital audio radio receiver, a first input connected to said antenna and a second input; and

a conductor connected at one end thereof to an output of said modulator unit and connected at the other end thereof to said second input, said antenna switch unit comprising a switching device for selectively switching between said first input and said second input for providing the corresponding one of said digital broadcast signal and said modulated reformatted digital audio signal to said output.

14. The apparatus of claim 13, further comprising a radio frequency detection and switching control device for controlling said switch device to automatically provide said modulated reformatted digital audio signal to said output in response to said modulated reformatted digital audio signal being provided to said antenna switch unit.

15. The apparatus of claim 12, wherein the auxiliary source is selected from the group comprising an MP3 player, a compact disc player, a digital video disc player, a tape cassette player, and a satellite digital audio radio receiver.

16. The apparatus of claim 12, wherein the auxiliary source is an satellite digital audio radio receiver and the digital audio radio receiver is an in-band on carrier terrestrial digital receiver.

17. The apparatus of claim 16, wherein the modulator unit is coupled to a satellite digital radio receiver antenna for receiving the auxiliary source over the air.

18. The apparatus of claim 12, wherein the apparatus further comprises a channel decoder for extracting a channel of digital information from the auxiliary source.

19. The apparatus of claim 18, wherein the digital information comprises digital audio and associated digital information and wherein the apparatus further comprises a decompressor for decompressing the digital information.

20. The apparatus of claim 19, wherein the encoder re-encodes the digital audio and the formatter re-formats the associated digital information and the re-encoded digital audio and the modulator unit modulates the re-encoded digital audio and the associated digital information.