Wireless audio systems and related methods

• US 8,284,713 B2
• Filed: 02/10/2006
• Issued: 10/09/2012
• Est. Priority Date: 02/10/2006
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Asati, Rajiv, Guy, Jason
• Primary Examiner(s): Pérez-Gutiérrez, Rafael
• Assistant Examiner(s): Miah, Liton
• Application Number:
  US11/352,123
• Publication Number:
  US 20070189202A1
• Time in Patent Office: 2,433 Days
• Field of Search: 370/338, 370/328, 455/334, 455/450, 455/509, 455/550.1, 455/563, 455/41.2, 381/311, 381/79
• US Class Current: 370/328
• CPC Class Codes: H04R 2420/07 Applications of wireless loudspeakers or wireless microphones
• CPC Class Codes: H04R 5/02 Spatial or constructional arrangements of loudspeakers
• CPC Class Codes: H04S 3/00 Systems employing more than two channels, e.g. quadraphonic H04S5/00, H04S7/00 take precedence

Abstract

Systems and methods are provided to facilitate the distribution of audio signals over wireless networks. In one implementation, an audio system includes a head end having an encoder and a wireless network interface. Audio signals associated with a plurality of audio channels are processed by the encoder to provide an encoded signal in accordance with an audio codec. The encoded signal can be provided to a wireless network by the wireless network interface as a plurality of data packets associated with a network address in accordance with a wireless networking protocol, such as an IEEE 802.11 protocol. One or more remote endpoints can also be provided to receive the data packets from the wireless network, assemble the data packets to obtain the encoded signal, and extract at least one of the audio signals from the encoded signal in accordance with the audio codec. Multicast and unicast implementations are also provided.

Claims

1. An audio system comprising:

an encoder that processes a plurality of audio signals to provide the audio signals in an encoded signal comprising a plurality of frames in accordance with an audio codec, wherein each frame comprises timestamping and synchronization information to maintain synchronization of the encoded signal, and wherein the audio signals are associated with a plurality of audio channels; and

a first wireless network interface that;

converts the frames of the encoded signal into a plurality of data packets in accordance with a wireless networking protocol, wherein each data packet comprises, inside, a corresponding one of the frames of the encoded signal including the timestamping and synchronization information of the corresponding one of the frames, wherein the audio signals in the encoded signal are encoded for a given time-slice into the same data packet; and

distributes the data packets to a wireless network in accordance with the wireless networking protocol, wherein each distributed data packet comprises Real Time Protocol (RTP) payloads encapsulated within Internet protocol (IP) corresponding to each one of the frames of the encoded signal, wherein at least one of the audio signals from the encoded signal is extracted by each decoder of a corresponding remote endpoint associated with one of the audio channels in accordance with the audio codec such that the audio signals associated with the plurality of audio channels are inside the RTP payloads and one or more of the audio signals is associated with a front audio channel and used as the audio signal heard by a listener through the front audio channel.

2. The audio system of claim 1, wherein the data packets are associated with a network address in accordance with the wireless networking protocol.

3. The audio system of claim 2, further comprising a plurality of remote endpoints associated with the network address in a multicast implementation, wherein each of the remote endpoints is associated with one of the audio channels.

4. The audio system of claim 3, wherein at least one of the remote endpoints comprises:

a second wireless network interface that receives the data packets from the wireless network and assemble the data packets to obtain the encoded signal; and

the decoder that extracts at least one of the audio signals from the encoded signal in accordance with the audio codec.

5. The audio system of claim 4, wherein the at least one of the remote endpoints further comprises an amplifier that receives the at least one of the audio signals from the decoder.

6. The audio system of claim 4, wherein the at least one of the remote endpoints further comprises an amplified speaker that receives the at least one of the audio signals from the decoder.

7. The audio system of claim 1, wherein the wireless networking protocol is an IEEE 802.11 protocol.

8. The audio system of claim 1, wherein the audio codec is AC-3.

9. The audio system of claim 1, wherein the encoded signal is a compressed audio signal.

10. An audio system comprising:

a first wireless network interface that receives a plurality of data packets from a second wireless network interface over a wireless network in accordance with a wireless networking protocol and assemble the data packets to obtain an encoded signal, wherein each data packet was converted from a plurality of frames of the encoded signal at the second wireless network interface, and each data packet comprises, inside, a corresponding one of the plurality of frames of the encoded signal, wherein each frame comprises timestamping and synchronization information to maintain synchronization of the encoded signal, wherein each data packet comprises Real Time Protocol (RTP) payloads encapsulated within Internet protocol (IP) corresponding to each frame of the encoded signal, wherein the encoded signal comprises at least one of a plurality of audio signals processed in accordance with an audio codec, wherein the audio signals are associated with a plurality of audio channels, and wherein the audio signals in the encoded signal are encoded for a given time-slice into the same data packet; and

at least one decoder, wherein each decoder extracts the at least one of the audio signals from the encoded signal in accordance with the audio codec, such that the at least one of the audio signals associated with the plurality of audio channels are inside the RTP payloads and the at least one of the audio signals is associated with a front audio channel and used as the audio signal heard by a listener through the front audio channel.

11. The audio system of claim 10, wherein the first wireless network interface and the decoder comprise a remote endpoint associated with at least one of the audio channels.

12. The audio system of claim 10, further comprising a head end comprising:

an encoder that processes the audio signals in accordance with the audio codec to provide the encoded signal; and

the second wireless network interface that distributes the encoded signal to the wireless network as the data packets in accordance with the wireless networking protocol.

13. The audio system of claim 10, further comprising an amplifier that receives the at least one of the audio signals from the decoder.

14. The audio system of claim 13, wherein the first wireless network interface, the decoder, and the amplifier comprise a remote endpoint associated with at least one of the audio channels.

15. The audio system of claim 14, wherein the remote endpoint further comprises a control that configures the amplifier.

16. The audio system of claim 15, wherein the control selects between an enabled state and a disabled state of the amplifier.

17. The audio system of claim 15, wherein the control adjusts a gain of the amplifier.

18. The audio system of claim 15, wherein the control is a switch.

19. The audio system of claim 15, wherein the control is a graphical user interface (GUI).

20. The audio system of claim 10, further comprising an amplified speaker that receives the at least one of the audio signals from the decoder.

21. The audio system of claim 10, wherein the wireless networking protocol is an IEEE 802.11 protocol.

22. The audio system of claim 10, wherein the audio codec is AC-3.

23. The audio system of claim 10, wherein the encoded signal is a compressed audio signal.

24. A method of providing a plurality of audio signals for an audio system, the method comprising:

receiving an encoded signal comprising a plurality of audio signals encoded in a plurality of frames in accordance with an audio codec, wherein each frame comprises timestamping and synchronization information to maintain synchronization of the encoded signal, and wherein the audio signals are associated with a plurality of audio channels;

converting the frames of the encoded signal into a plurality of data packets, wherein each data packet comprises inside a corresponding one of the frames of the encoded signal including the timestamping and synchronization information of the corresponding one of the frames, wherein the audio signals in the encoded signal are encoded for a given time-slice into the same data packet; and

distributing the data packets to a wireless network in accordance with a wireless networking protocol, wherein each distributed data packet comprises Real Time Protocol (RTP) payloads encapsulated within Internet protocol (IP) corresponding to each one of the frames of the encoded signal, wherein at least one of the audio signals from the encoded signal is extracted by each decoder of a corresponding remote endpoint associated with one of the audio channels in accordance with the audio codec such that the audio signals associated with the plurality of audio channels are inside the RTP payloads and one or more of the audio signals is associated with a front audio channel and used as the audio signal heard by a listener through the front audio channel.

25. The method of claim 24, further comprising:

receiving the data packets over the wireless network;

assembling the data packets to obtain the encoded signal; and

extracting at least one of the audio signals from the encoded signal in accordance with the audio codec.

26. The method of claim 24, wherein the wireless networking protocol is an IEEE 802.11 protocol.

27. An audio system comprising:

means for processing a plurality of audio signals to provide the audio signals in an encoded signal comprising a plurality of frames in accordance with an audio codec, wherein each frame comprises timestamping and synchronization information to maintain synchronization of the encoded signal, and wherein the audio signals are associated with a plurality of audio channels;

means for converting the frames of the encoded signal into a plurality of data packets in accordance with a wireless networking protocol, wherein each data packet comprises inside a corresponding one of the frames of the encoded signal including the timestamping synchronization information of the corresponding one of the frames, wherein the audio signals in the encoded signal are encoded for a given time-slice into the same data packet; and

means for distributing the data packets to a wireless network in accordance with the wireless networking protocol, wherein each distributed data packet comprises Real Time Protocol (RTP) payloads encapsulated within Internet protocol (IP) corresponding to each one of the frames of the encoded signal, wherein at least one of the audio signals from the encoded signal is extracted by each means for decoding of a corresponding remote endpoint that is associated with one of the audio channels in accordance with the audio codec such that the audio signals associated with the plurality of audio channels are inside the RTP payloads and one or more of the audio signals is associated with a front audio channel and used as the audio signal heard by a listener through the front audio channel.

28. The audio system of claim 27, wherein the data packets are associated with a network address in accordance with the wireless networking protocol.

29. An audio system comprising:

means for receiving a plurality of data packets from a means for transmitting the plurality of data packets over a wireless network in accordance with a wireless networking protocol;

means for assembling the data packets to obtain an encoded signal, wherein each data packet was converted from a plurality of frames of the encoded signal in the means for transmitting, wherein each data packet comprises inside a corresponding one of the plurality of frames of the encoded signal, wherein each frame comprises timestamping and synchronization information to maintain synchronization of the encoded signal, wherein each data packet comprises Real Time Protocol (RTP) payloads encapsulated within Internet protocol (IP) corresponding to each frame of the encoded signal, wherein the encoded signal comprises at least one of a plurality of audio signals processed in accordance with an audio codec, wherein the audio signals are associated with a plurality of audio channels, and wherein the audio signals in the encoded signal are encoded for a given time-slice into the same data packet; and

at least one means for extracting, wherein each means for extracting extracts the at least one of the audio signals from the encoded signal in accordance with the audio codec, such that the audio signals associated with the plurality of audio channels are inside the RTP payloads and one or more of the audio signals is associated with a front audio channel and used as the audio signal heard by a listener through the front audio channel.

30. The audio system of claim 29, further comprising means for amplifying the at least one of the audio signals.