Wireless audio signal transmission method for a three-dimensional sound system

• US 20060153389A1
• Filed: 06/27/2003
• Published: 07/13/2006
• Est. Priority Date: 06/28/2002
• Status: Abandoned Application

• Current Assignee: Trident Microsystems Limited (Avnet Incorporated)
• Original Assignee: Micronas Gmbh (TDK Corporation)
• Inventors: Temerinac, Miodrag, Fiesel, Hans, Bock, Christian
• Application Number:
  US10/519,590
• Publication Number:
  US 20060153389A1
• Time in Patent Office: Days
• US Class Current: 381/2
• CPC Class Codes: H04H 20/88 Stereophonic broadcast systems multiplex system in general H04J

Abstract

A three-dimensional sound system includes a wireless audio signal transmission method for transmitting audio signals between a transmitting device and a spatially adjacent receiving device associated with an audio signal reproduction device such as a speaker. The audio signals may be digitized in the transmitting device, compressed, and transmitted by a digital high-frequency transmission method as data packets. Symbols may be assigned to the individual data in a quadrature signal plane. A diversity operation takes place between the transmitting device and the receiving device, where the transmitting device has two high-frequency transmitters with quadrature conversion which are each connected to an associated transmission antenna. On the receiver side, each audio signal reproduction device has a receiving device with one receiving antenna and one high-frequency receiver. Differentiation of the two received high-frequency data streams having the individual symbols in coded form may be implemented in a decoding device.

Claims

1. A method for wireless transmission of audio signals between a transmitting device and a receiving device, the receiving device having an audio signal reproduction device, the method comprising the steps of:

digitizing the audio signals;

coding the digitized audio signals;

transmitting the coded digitized audio signals as separate data streams

receiving the transmitted data streams;

decoding the received data streams;

outputting the decoded data streams through the audio signal reproduction device; and

providing transmitter diversity between the transmitting device and the receiving device where the transmitting device includes two transmitters each having an associated antenna and operating in the same frequency band, the receiving device having at least one receiving antenna and at least one receiver for the frequency band.

2. The method of claim 1, where the step of digitizing further comprises the step of digitizing the audio signals into a data sequence, and where the method further comprises the steps of:

converting the data sequence into a first and second data sequence of successive symbol pairs, wherein in the first and second data sequence the symbol pairs that are related in time include the same symbols;

transposing the order of the symbols within the symbol pairs in the first and second data sequence relative to each other in a time sequence; and

implementing a change in coding of quadrature signal components representing the coded digitized audio signals, wherein the change in coding relates to a sign of the symbol.

3. The method of claim 2, where the change in coding relates to a transformation of the symbol to its complex conjugate value.

4. The method of claim 1, where each digitized audio signal has a plurality of discrete data points, and where the step of coding further comprises the step of assigning a symbol in a quadrature signal plane to each discrete data point.

5. The method of claim 1, further comprising the step of compressing the digitized audio signals prior to the step of transmitting and further comprising the step of decompressing the digitized audio signals after the step of receiving.

6. The method of claim 1, where the separate data streams are transmitted as data packets, each packet including header information comprising control and auxiliary information, each packet including data corresponding to the audio signals where each packet includes an even number of data blocks by which data associated with a first and second audio channel are alternately transmitted in blocks.

7. A system for wireless transmission of digitized audio signals, comprising:

a transmitting device; and

a receiving device;

where the transmitting device includes a coding device that codes the digitized audio signals as data packets; and

includes

two transmitters that generate quadrature signals in the same frequency band which are modulated with the data packets and are transmitted by a corresponding antenna for each transmitter, where

the antennas are located in a spatial relationship for transmitter diversity operation; and

where the receiving device includes an audio reproduction device and at least one receiver that receives the transmitted quadrature signals, the receiving device further includes a decoder that decodes the received quadrature signals and provides a decoded audio signal to an audio reproduction device.

8. The system of claim 7, where the digitized audio signals are arranged in a first data sequence, the coding device generates a pair of data sequences from the first data sequence, and where the transmitting device include quadrature mixers that convert the pair of data sequences to the same high-frequency band and provide the converted data sequences to the corresponding antennas for transmission.

9. The system of claim 8, where the coding device generates the pair of data sequences based on a space-time block code.

10. The system of claim 8, where the pair of data sequences each includes data that represents symbols arranged as successive symbol pairs that are related in time.

11. The system of claim 9, where the decoding device decodes the data sequences based on the space-time block code, and where the receiving device includes first switch that supplies the received quadrature signals to a first and second terminal of a linear combination device at a clock period of a symbol rate, a symbol decision element connected to two outputs of the linear combination device a symbol table connected to the symbol decision element that supplies a logical level of each of the associated symbols within the received quadrature signals, and a second switch that regenerates the first data sequence from the symbols by alternate switching at the symbol clock period.

12. A system for wireless transmission and reception of audio signals, comprising a transmitter side and a receiver side, where the transmitter side comprises:

a source of audio signals that provides the audio signals in a data sequence;

an encoder that codes the data sequence into a pair of data streams;

a pair of transmitters that each transmits a corresponding one of the pair of data streams; and

a pair of transmitting antennas each associated with a corresponding one of the pair of transmitters, the transmitting antennas being located in a spatially-separated transmitter diversity relationship with each other, the antennas transmitting the corresponding one of the pair of data streams on a frequency that is that same for each antenna;

and where the receiver side comprises

a receiving antenna that receives the transmitted pair of data streams;

a receiver that processes the received data streams;

a decoder that recovers the data sequence from the processed data streams and provides an audio signal in response thereto; and

an audio reproduction device that outputs the audio signal from the decoder.

13. The system of claim 12, where the audio signals are in analog format, and where the transmitter side digitizes the audio signals.

14. The system of claim 12, where the audio signals are in digital format.

15. Ths system of claim 12, where the transmitter side compresses the data sequence, and where the receiver side decompresses the data sequence.

16. The system of claim 12, where the encoder codes the data sequence into a pair of data streams each comprising symbols.

17. The system of claim 16, where the transmitters transmit the data streams comprising symbols using quadrature amplitude modulation, and where the receiver processes the received data streams by evaluating the received data streams at predefined times at which each of the symbols within the transmitted data streams occupies a defined state in the quadrature signal plane.

18. The system of claim 17, where the receiver determines the defined state that corresponds to the transmitted symbols by sampling and digitizing the received data streams at least at defined times and at a frequency that is lower than the frequency that the data streams are transmitted.

19. The system of claim 16, where the encoder codes the data sequence using space-time block codes, and where the receiver processes the received data streams using space-time block codes.

20. The system of claim 12, where the transmitters modulate the pair of data sequences onto a high-frequency carrier signal, and where the receiver converts the received data streams to a frequency that is lower that that of the high-frequency carrier signal.