Wireless digital audio music system

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.

1 .- 20 . (canceled) 
     
     
         21 . A spread spectrum audio transmitter operatively coupled to a music audio source and configured to transmit a unique user code and wireless modulation transmissions representative of an audio signal, said spread spectrum audio transmitter configured to:
 encode a first representation of an audio signal to reduce intersymbol interference associated with a transmitted representation of the audio signal;   perform at least one of a plurality of modulations on the first representation of the audio signal;   generate a modulated signal based on the performance of at least one of the plurality of modulations, wherein the plurality of modulations includes a differential phase shift keying (DPSK) modulation and a non-DPSK modulation; and   use the modulated signal and independent code division multiple access communication to wirelessly transmit the transmitted representation of the audio signal;   wherein said plurality of modulations are separate from the encoding.   
     
     
         22 . The spread spectrum audio transmitter of  claim 21 , wherein the audio signal represents music. 
     
     
         23 . The spread spectrum audio transmitter of  claim 21 , wherein the spread spectrum audio transmitter comprises a headphone plug configured to connect with a headphone jack of the music audio source. 
     
     
         24 . The spread spectrum audio transmitter of  claim 21 , wherein the transmitted unique user code distinguishes the transmitted representation of the audio signal from other transmitted audio signals in the spread spectrum audio transmitter spectrum, said other transmitted audio signals not originating from said spread spectrum audio transmitter. 
     
     
         25 . The spread spectrum audio transmitter of  claim 21 , further comprises a power supply. 
     
     
         26 . The spread spectrum audio transmitter of  claim 21 , wherein the music audio source is a portable computing system. 
     
     
         27 . The spread spectrum audio transmitter of  claim 21 , wherein the music audio source is detachable from the spread spectrum audio transmitter. 
     
     
         28 . The spread spectrum audio transmitter of  claim 21 , wherein the music audio source is a computing system. 
     
     
         29 . A system comprising the spread spectrum audio transmitter of  claim 21 , said system further comprising a portable spread spectrum audio receiver configured to receive and store the unique user code. 
     
     
         30 . The system of  claim 29 , further comprising a headphone unit, wherein said portable spread spectrum audio receiver is integrated with the headphone unit. 
     
     
         31 . A spread spectrum audio receiver configured to receive a unique user code and wireless transmissions representative of an audio signal, said spread spectrum audio receiver configured to:
 recognize the received unique user code;   use code division multiple access and the unique user code to receive the wireless transmissions from a wireless transmitter operating in the same spread spectrum frequency;   process the received wireless transmissions for reduction of intersymbol interference;   perform a DPSK demodulation and a second demodulation on processed wireless transmissions representative of the audio signal;   generate an audio output signal representative of the audio signal; and   provide audible representation of the audio signal.   
     
     
         32 . The spread spectrum audio receiver of  claim 31 , wherein the second demodulation is a 64-ary demodulation. 
     
     
         33 . The spread spectrum audio receiver of  claim 31 , wherein the audible representation is provided by a speaker operatively coupled to the spread spectrum audio receiver. 
     
     
         34 . The spread spectrum audio receiver of  claim 33 , wherein the speaker is operatively coupled to a fixation structure providing removable attachment to a human head. 
     
     
         35 . The portable spread spectrum audio receiver of  claim 31 , wherein said an audio output signal is capable of representing audio signals below 40 Hz and also capable of representing audio signals above 5 kHz. 
     
     
         36 . The portable spread spectrum audio receiver of  claim 31 , wherein the portable spread spectrum audio receiver includes a power supply. 
     
     
         37 . The portable spread spectrum audio receiver of  claim 31 , wherein the audio signal representation represents music.