Digital wireless loudspeaker system

• US 20040223622A1
• Filed: 04/06/2001
• Published: 11/11/2004
• Est. Priority Date: 12/01/1999
• Status: Abandoned Application

• Current Assignee: Cirrus Logic Incorporated
• Original Assignee: Cirrus Logic Incorporated
• Inventors: Melanson, John Laurence, Carlson, Jason Lee, Lindemann, Eric Lee, Kates, James Mitchell
• Application Number:
  US09/707,616
• Publication Number:
  US 20040223622A1
• Time in Patent Office: Days
• US Class Current: 381/79
• CPC Class Codes: H04R 2205/024 Positioning of loudspeaker enclosures for spatial sound reproduction
• CPC Class Codes: H04R 2420/03 Connection circuits to selectively connect loudspeakers or headphones to amplifiers
• CPC Class Codes: H04R 2420/07 Applications of wireless loudspeakers or wireless microphones
• CPC Class Codes: H04R 5/04 Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments combinations of amplifiers H03F3/68; stereophonic systems H04S

Abstract

A digital wireless loudspeaker system includes an audio transmission device for selecting and transmitting digital audio data, and wireless speakers for receiving the data and broadcasting sound. The audio transmission device selects digital audio data together with a sample clock from a stereo compact disk, or decoded DVD data. The sample clock clocks an element that generates frames of data and adds error protection. Status messages are included in the transmission frames to control speaker attributes such as speaker group, enabling or disabling a sub-woofer, and volume of the loudspeaker digitally. These transmission frames are clocked into an RF transmitter and transmitted to the speakers. The received bit stream and symbol clock are output from the RF receiver in each speaker and input to a framing and error protection decoder and a sample clock generator. The recovered audio sample data and sample clock are input to a digital to speaker input conversion and channel selector.

Claims

1. A discrete speaker for use in a distributed digital wireless loudspeaker system having at least two discrete speakers and a single receiver for transmitting an RF signal including a transmission clock and at least two audio channels of transmission data, the speaker comprising:

means for receiving the RF signal,

means for generating a derived sample clock based upon the transmission clock,

means for selecting one of the audio channels from the RF signal for broadcast,

means for generating an output audio signal based upon the selected audio channel, and

means for broadcasting sound based upon the selected audio channel.

2. The speaker of claim 1 wherein the received RF signal further includes status data.

3. The speaker of claim 2, further comprising means, responsive to a control signal in the status data, for selectively activating the speaker.

4. The speaker of claim 2, further comprising means for responding to a control signal in the status data operable for controlling volume of the broadcast sound.

5. The speaker of claim 2, further comprising means for responding to a control signal in the status data operable for controlling equalization of the broadcast sound.

6. The speaker of claim 1, wherein the receiver receives two RF signals at two different frequencies, each RF signal including one of the audio channels.

7. The speaker of claim 1, wherein the RF signal further includes a channel of status data.

8. The speaker of claim 7, wherein the two channels of audio transmission data and the status channel are multiplexed prior to transmission, and the speaker further includes means for demultiplexing the received RF signal.

9. The speaker of claim 2, further comprising means, responsive to a control signal in the status data for assigning the speaker to a speaker group, for selectively activating the speaker based on the speaker group to which the speaker is assigned.

10. The speaker of claim 1 wherein the RF signal includes frame markers and the speaker further comprises means, responsive to the frame markers, for synchronizing the sound broadcast by the speaker with the sound broadcast by each other speaker in the wireless loudspeaker system.

48. The speaker of claim 1, the means for generating a derived sample clock comprising means for obtaining a direct sequence spread spectrum chip clock having a rate equal to an integer multiple of a rate of an audio sample clock.

11. Cancelled

12. Cancelled

13. Cancelled

14. A discrete speaker for use in a distributed digital wireless loudspeaker system having at least two discrete speakers and a single receiver for transmitting an RF signal including at least two audio channels of transmission data, the speaker comprising:

means for receiving the RF signal including the at least two audio channels of transmission data,

means for selecting one of the audio channels of transmission data,

means for generating output audio data based upon the selected audio channel, and

means for broadcasting sound based upon the selected audio channel.

15. The speaker of claim 14 wherein the received RF signal includes status data.

16. The speaker of claim 15, further comprising means, responsive to a control signal in the status data, for selectively activating the speaker.

17. The speaker of claim 15, further comprising means, responsive to a control signal in the status data, for controlling volume of the broadcast sound.

18. The speaker of claim 15, further comprising means, responsive to a control signal in the status data, for controlling equalization of the broadcast sound.

19. The speaker of claim 14 further comprising means, responsive to a control signal in the status data for assigning the speaker to a speaker group, for selectively activating the speaker based on the speaker group to which the speaker is assigned.

20. The speaker of claim 14 wherein the RF signal includes frame markers, and the speaker further comprises means, responsive to the frame markers, for synchronizing the speaker with the sound broadcast by each other speaker in the wireless loudspeaker system.

21. Cancelled

22. Cancelled

23. Cancelled

24. A discrete speaker for use in a distributed digital wireless loudspeaker system having at least two discrete speakers and a single receiver for transmitting an RF signal including at least two audio channels of transmission data and frame markers appearing at predetermined intervals in the RF signal, the speaker comprising:

means for receiving the RF signal

means for selecting one of the audio channels of the received RF signal,

means for generating an output audio signal based upon the selected audio channel,

means, responsive to the frame markers, for synchronizing the output audio signal with the output audio signal of each other speaker in the wireless loudspeaker system, and

means for broadcasting sound based upon the synchronized output audio signal.

25. The speaker of claim 24 wherein the received RF signal includes status data.

26. The speaker of claim 25, further comprising means, responsive to a control signal in the status data, for activating the wireless speaker.

27. The speaker of claim 25, further comprising means, responsive to a control signal in the status data, for controlling volume of the broadcast sound.

28. The speaker of claim 25, further comprising means, responsive to a control signal in the status data, for controlling equalization of the broadcast sound.

29. The speaker of claim 24, wherein the receiver receives two RF signals at two different frequencies, each RF signal including one of the transmission channels.

30. The speaker of claim 24, wherein the RF signal includes a channel of status data and the two channels of audio transmission data and the status channel are multiplexed prior to transmission, the speaker further comprising means for demultiplexing the received RF signal.

31. The speaker of claim 24, further comprising means, responsive to a control signal in the status data for assigning the speaker to a speaker group, for selectively activating the speaker based on the speaker group to which the speaker is assigned.

32. A discrete speaker for use in a distributed digital wireless loudspeaker system having at least two discrete speakers and a single receiver for transmitting an RF signal including at least two audio channels of transmission data and status data, the speaker comprising:

means for receiving the RF signal

means for selecting one of the audio channels of the received RF signal,

means for generating an output audio signal based upon the selected channel and the status data,

means for broadcasting sound based upon the output audio signal and the status data.

33. The speaker of claim 32, comprising means, responsive to a control signal for assigning the speaker to a speaker group, for selectively activating the speaker based on the speaker group to which the speaker is assigned.

34. The speaker of claim 32, wherein the RF signal includes frame markers, and the speaker further comprises means, responsive to the frame markers, for synchronizing the sound broadcast by the speaker with sound broadcast with each other speaker in the wireless loudspeaker system.

35. Cancelled

36. Cancelled

37. Cancelled

38. A discrete speaker for use in a distributed digital wireless loudspeaker system having at least two discrete speakers and a single receiver for transmitting an RF signal including at least two multiplexed audio channels of transmission data, the speaker comprising:

means for receiving the RF signal

means for demultiplexing the received RF signal,

means for selecting one of the audio channels from the demultiplexed signal,

means for generating an output audio signal based upon the selected audio channel, and

means for broadcasting sound based upon the output audio signal.

39. The speaker of claim 38, wherein the RF signal further includes status data.

40. The speaker of claim 39, further comprising means, responsive to a control signal in the status data, for activating the wireless speaker.

41. The speaker of claim 39, further comprising means, responsive to a control signal in the status data, for controlling volume of the broadcast sound.

42. The speaker of claim 39, further comprising means, responsive to a control signal in the status data, for controlling equalization of the broadcast sound.

43. The speaker of claim 39, further including means, responsive to a control signal in the status data for assigning the speaker to a speaker group, for selectively activating the speaker based on the speaker group to which the speaker is assigned.

44. The speaker of claim 38, wherein the RF signal includes frame markers, and the speaker further comprises means, responsive to the frame marker for synchronizing the sound broadcast by the speaker with sound broadcast with each other speaker in the wireless loudspeaker system.

45. Cancelled

46. Cancelled

47. Cancelled