Wireless digital audio system

• US 7,865,258 B2
• Filed: 09/30/2009
• Issued: 01/04/2011
• Est. Priority Date: 12/21/2001
• Status: Expired due to Term

• Current Assignee: One-E-Way
• Original Assignee: One-E-Way
• Inventors: Woolfork, C. Earl
• Primary Examiner(s): Flanders; Andrew C
• Application Number:
  US12/570,343
• Publication Number:
  US 20100014698A1
• Time in Patent Office: 461 Days
• Field of Search: None
• US Class Current: 700/94
• CPC Class Codes: H04R 1/1083 Reduction of ambient noise active noise reduction per se G10K11/175; protective devices for the ear, e.g. providing acoustic protection A61F11/06
• CPC Class Codes: H04R 2420/07 Applications of wireless loudspeakers or wireless microphones
• CPC Class Codes: H04R 5/033 Headphones for stereophonic communication details thereof, e.g. relating to batteries, cables or control elements H04R1/10

Abstract

A wireless digital audio system includes a portable audio source with a digital audio transmitter operatively coupled thereto and an audio receiver operatively coupled to a headphone set. The audio receiver is configured for digital wireless communication with the audio transmitter. The digital audio receiver utilizes fuzzy logic to optimize digital signal processing. Each of the digital audio transmitter and receiver is configured for code division multiple access (CDMA) communication. The wireless digital audio system allows private audio enjoyment without interference from other users of independent wireless digital transmitters and receivers sharing the same space.

Claims

1. A portable wireless digital audio system for digital transmission of an original audio signal representation from a portable audio source to a portable digital audio headphone receiver, said portable wireless digital audio system comprising:

a digital audio transmitter, capable of mobile operation, transmitting a unique user code with said original audio signal representation in packet format, wherein said digital audio transmitter is operatively coupled to said portable audio source, said digital audio transmitter comprising;

a digital modulator configured for independent code division multiple access (CDMA) communication operation;

said digital audio transmitter configured for direct digital wireless communication with said portable digital audio headphone receiver, wherein said headphone receiver is configured to receive said unique user code with said original audio signal representation in packet format, said portable digital audio headphone receiver comprising;

an embedded fuzzy logic detector wherein the fuzzy logic detector activates fuzzy logic rules and performs a defuzzification operation to enhance detection of the unique user code;

a digital demodulator configured for independent CDMA communication operation;

a digital-to-analog converter (DAC) generating an audio output of said original audio signal representation; and

a module adapted to reproduce said generated audio output.

2. A wireless digital audio headphone comprising:

a digital audio receiver configured to receive a unique user code bit sequence and a original audio signal representation in the form of packets;

an embedded fuzzy logic detector wherein the fuzzy logic detector activates fuzzy logic rules and performs a defuzzification operation to enhance detection of the unique user code bit sequence;

a digital-to-analog converter (DAC) generating an audio output of the received original audio signal representation; and

a module adapted to reproduce said generated audio output.

3. A portable wireless digital audio transmitter system for digital transmission of an original audio signal representation from a portable audio source to a portable digital audio headphone receiver, said portable wireless digital audio system comprising:

a digital audio transmitter operatively coupled to said portable audio source and transmitting a unique user code bit sequence with said original audio signal representation in packet format, wherein said digital audio transmitter operatively coupled to said audio source is capable of mobile operation, said digital audio transmitter comprising;

an encoder operative to encode said original audio signal representation to reduce intersymbol interference;

a digital modulator module configured for independent CDMA communication operation;

said digital audio transmitter configured for direct digital wireless communication with said portable digital audio headphone receiver, said portable digital audio headphone receiver comprising;

a direct conversion module configured to capture packets embedded in the received spread spectrum signal, the captured packets corresponding to the unique user code bit sequence;

a digital demodulator configured for independent CDMA communication operation;

a decoder operative to decode the applied reduced intersymbol interference coding of said original audio signal representation;

a digital-to-analog converter (DAC) generating an audio output of said original audio signal representation; and

a module adapted to reproduce said generated audio output, said audio having been wirelessly transmitted from said portable audio source and reproduced virtually free from interference.

4. A portable wireless digital audio system for digital transmission of an original audio signal representation from a portable audio source to a portable digital audio headphone receiver, said portable wireless digital audio system comprising:

a digital audio transmitter operatively coupled to said portable audio source and transmitting a unique user code bit sequence with said original audio signal representation in packet format, wherein said digital audio transmitter operatively coupled to said audio source is capable of mobile operation, said digital audio transmitter comprising;

an encoder operative to encode said original audio signal representation to reduce intersymbol interference;

a channel encoder and interleaver to reduce transmission errors;

a differential phase shift keying (DPSK) modulator being configured for independent code division multiple access (CDMA) communication operation;

said digital audio transmitter configured for direct digital wireless communication with said portable digital audio headphone receiver, said portable digital audio headphone receiver comprising;

a direct conversion module configured to capture packets embedded in the received spread spectrum signal, the captured packets corresponding to the unique user code bit sequence;

a digital demodulator configured for independent CDMA communication operation;

a viterbi decoder and de-interleaver generating a corresponding digital output;

a decoder operative to decode the applied reduced intersymbol interference coding of said original audio signal representation;

a digital-to-analog converter (DAC) generating an audio output of said original audio signal representation; and

a module adapted to reproduce said generated audio output, said audio having been wirelessly transmitted from said portable audio source virtually free from interference from device transmitted signals operating in the portable wireless digital audio system spectrum.

5. A portable wireless digital audio system for digital transmission of an original audio signal representation from a portable audio source to a portable digital audio headphone receiver, said portable wireless digital audio system comprising:

a digital audio transmitter operatively coupled to said portable audio source and transmitting a unique user code with said original audio signal representation in packet format, wherein said digital audio transmitter coupled to said audio source is capable of mobile operation, said digital audio transmitter comprising;

a encoder operative to encode said original audio signal representation to reduce intersymbol interference;

a digital modulator configured for independent code division multiple access (CDMA) communication operation said digital audio transmitter configured for direct digital wireless communication with said portable digital audio headphone receiver, said portable digital audio headphone receiver comprising;

an embedded fuzzy logic detector wherein the fuzzy logic detector activates fuzzy logic rules and performs a defuzzification operation to enhance detection of the unique user code;

a direct conversion module configured to capture packets embedded in the received spread spectrum signal, the captured packets corresponding to the detected unique user code;

a digital demodulator configured for independent CDMA communication operation;

a decoder operative to decode the applied reduced intersymbol interference coding of said original audio signal representation;

a module adapted to reproduce audio of said original audio signal representation.

6. A portable wireless digital audio system for digital transmission of an original audio signal representation from a portable audio source to a digital audio headphone, said portable wireless digital audio system comprising:

a digital audio transmitter operatively coupled to said portable audio source and transmitting a unique user code bit sequence with said original audio signal representation in packet format, wherein said digital audio transmitter coupled to said audio source is capable of mobile operation, said digital audio transmitter comprising;

an encoder operative to encode said original audio signal representation to reduce intersymbol interference;

a differential phase shift keying (DPSK) modulator being configured for independent code division multiple access (CDMA) communication operation;

said digital audio transmitter configured for direct digital wireless communication with said portable digital audio headphone receiver, said portable digital audio headphone receiver comprising;

an embedded fuzzy logic detector wherein the fuzzy logic detector activates fuzzy logic rules and performs a defuzzification operation to enhance detection of the unique user code bit sequence;

a direct conversion module configured to capture packets embedded in the received spread spectrum signal, the captured packets corresponding to the detected unique user code bit sequence;

a digital demodulator configured for independent CDMA communication operation;

a decoder operative to decode the applied reduced intersymbol interference coding of said original audio signal representation;

a digital-to-analog converter (DAC) generating an audio output of said original audio signal representation; and

a module adapted to reproduce said generated audio output.

7. A portable wireless digital audio system for digital transmission of an original audio representation from a portable audio source to a digital audio receiver, said portable wireless digital audio system comprising:

a mobile digital audio transmitter operatively coupled to said portable audio source, said mobile digital audio transmitter configured to transmit a unique user code with the original audio representation;

a mobile digital audio receiver configured for direct digital wireless communication with said mobile digital audio transmitter, said mobile audio receiver comprising;

an embedded fuzzy logic detector wherein the fuzzy logic detector activates fuzzy logic rules and performs a defuzzification operation to enhance detection of the unique user code;

a digital demodulator;

a digital-to-analog converter (DAC) generating an audio output of said original audio representation; and

a module adapted to reproduce said generated audio output.

8. A portable wireless digital audio system for digital transmission of an original audio signal representation from a portable audio source to a digital audio headphone, said portable wireless digital audio system comprising:

a portable digital audio transmitter configured to couple to said portable audio source and transmitting a unique user code bit sequence with said original audio signal representation in packet format, said digital audio transmitter comprising;

an encoder operative to encode said original audio signal representation to reduce intersymbol interference; and

a digital modulator configured for independent code division multiple access (CDMA) communication operation; and

said portable digital audio transmitter configured for direct digital wireless communication with said digital audio headphone, said digital audio headphone comprising;

a direct conversion module configured to capture packets embedded in the received spread spectrum signal, the captured packets corresponding to the unique user code bit sequence;

a digital demodulator configured for independent CDMA communication operation;

a decoder operative to decode the applied reduced intersymbol interference coding of said original audio signal representation;

a digital-to-analog converter (DAC) generating an audio output of said original audio signal representation; and

a module adapted to reproduce said generated audio output, said audio having been wirelessly transmitted from said portable audio source virtually free from interference from device transmitted signals operating in the portable wireless digital audio system spectrum.

9. A wireless digital audio receiver comprising:

an embedded fuzzy logic detector wherein the fuzzy logic detector activates fuzzy logic rules and performs a defuzzification operation in response to a received unique user code to enhance detection of the unique user code;

a direct conversion module being configured to capture the correct unique user code bit sequence embedded in a received CDMA signal;

a digital demodulator adapted to process output from said direct conversion module;

a digital-to-analog converter (DAC) generating an audio output wherein if the unique user code bit sequence corresponding to the decoded and converted digital signal is recognized, said audio output having been wirelessly transmitted, said audio output reproduced virtually without interference when operated in a shared space containing at least one other user of a wireless device utilizing code division multiple access (CDMA) communication.

10. A portable wireless digital audio system for digital transmission of an original audio signal representation from a audio source to a digital audio receiver, said portable wireless digital audio system comprising:

a digital audio transmitter operatively coupled to said audio source and transmitting a unique user code with said original audio signal representation in packet format, wherein said digital audio transmitter coupled to said audio source and is capable of being moved in any direction during operation, said digital audio transmitter comprising;

an encoder operative to encode said original audio signal representation to reduce intersymbol interference;

an interleaver to reduce transmission errors;

a digital modulator module configured for independent CDMA communication operation;

said digital audio receiver capable of being moved in any direction during operation, is in direct communication with said digital audio transmitter, said digital audio receiver comprising;

a direct conversion module configured to capture packets embedded in the received spread spectrum signal, the captured packets corresponding to the unique user code;

a digital demodulator configured for independent CDMA communication operation;

an de-interleaver generating a corresponding digital output;

a decoder operative to decode the applied reduced intersymbol interference coding of said original audio signal representation;

a digital-to-analog converter (DAC) generating an audio output of said original audio signal representation; and

a module adapted to reproduce said generated audio output, said audio having been wirelessly transmitted from said audio source virtually free from interference from device transmitted signals operating in the portable wireless digital audio system spectrum.

11. A portable wireless digital audio system for digital transmission of an original audio signal representation from a audio source to a digital audio receiver, said portable wireless digital audio system comprising:

a digital audio transmitter operatively coupled to said audio source and transmitting a unique user code with said original audio signal representation in packet format, wherein said digital audio transmitter coupled to said audio source is capable of being moved in any direction during operation, said digital audio transmitter comprising;

an encoder operative to encode said original audio signal representation to reduce intersymbol interference;

a digital modulator module configured for independent code division multiple access (CDMA) communication operation and utilizing differential phase shift keying (DPSK) to modulate said original audio signal representation;

said digital audio receiver capable of being moved in any direction during operation and in direct communication with said digital audio transmitter, said digital audio receiver comprising;

a direct conversion module configured to capture packets embedded in the received spread spectrum signal, the captured packets corresponding to the unique user code;

a digital demodulator configured for independent CDMA communication operation;

a decoder operative to decode the applied reduced inter-symbol interference coding of said original audio signal representation;

a digital-to-analog converter (DAC) generating an audio output of said original audio signal representation; and

a module adapted to reproduce said generated audio output, said audio having been wirelessly transmitted from said audio source virtually free from interference.

12. A portable wireless digital audio system comprising:

a digital audio transmitter operatively coupled to a portable audio source and configured to wirelessly transmit audio output from the portable audio source, the digital audio transmitter further configured to add a unique user code bit sequence to the audio output prior to the transmission;

a wireless digital audio headphone comprising;

a digital audio receiver configured to receive the unique user code bit sequence and the audio output;

an embedded fuzzy logic detector wherein the fuzzy logic detector activates fuzzy logic rules and performs a defuzzification operation to enhance detection of the unique user code bit sequence;

a digital-to-analog converter (DAC) generating an audio signal output of the received audio output; and

a module adapted to reproduce said generated audio signal output.

13. The portable wireless digital audio system of claim 12, wherein said digital demodulator audio transmitter is portable.