(12) United States Patent
`Woolfork
`
`(10) Patent No.:
`(45) Date of Patent:
`
`US 8.131,391 B2
`*Mar. 6, 2012
`
`USOO8131391 B2
`
`WIRELESS DIGITAL AUDIO MUSIC SYSTEM
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`5,771,441 A * 6/1998 Altstatt ........................ 455/66.1
`6,728,585 B2
`4/2004 Neoh
`6,781,977 B1 * 8/2004 Li ................................. 370,335
`7,409,064 B2
`8, 2008 Watanuki
`2004/0223622 A1* 11/2004 Lindemann et al. ............ 381.79
`OTHER PUBLICATIONS
`Authors: Ishiguro, Takahashi, Yoshida, Miyajima Title: Single-Chip
`Transceiver LSI For Spread Spectrum Communication With Smart
`Synchronization Technique Date: Nov. 1997 Consumer Electronics,
`vol.43, Issue 4, pp. 1331 ISSN 0098-3063.
`Author: Weizhong, Chen Title: Motorola's Bluetooth Solution to
`Interference Rejection and Coexistence with 802.11 Date: Dec. 2001
`Application Note AN2211/D Rev. 0 pp. 1-8.
`* cited by examiner
`Primary Examiner — Andrew C Flanders
`(74) Attorney, Agent, or Firm — Megan Lyman
`
`ABSTRACT
`(57)
`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 head
`phone set. The audio receiver is configured for digital wire
`less 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) com
`munication. The wireless digital audio system allows private
`audio enjoyment without interference from other users of
`independent wireless digital transmitters and receivers shar
`ing the same space.
`
`10 Claims, 3 Drawing Sheets
`
`(54)
`(75)
`(73)
`(*)
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`(21)
`(22)
`(65)
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`(63)
`
`Inventor: C. Earl Woolfork, Pasadena, CA (US)
`Assignee: One-E-Way, Inc., Pasedena, CA (US)
`
`Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 0 days.
`This patent is Subject to a terminal dis
`claimer.
`
`Appl. No.: 12/940,747
`
`Filed:
`
`Nov. 5, 2010
`
`Prior Publication Data
`US 2011/0044466A1
`Feb. 24, 2011
`
`Related U.S. Application Data
`Continuation of application No. 12/570,343, filed on
`Sep. 30, 2009, now Pat. No. 7,865,258, which is a
`continuation of application No. 12/144.729, filed on
`Jul. 12, 2008, now Pat. No. 7,684.885, which is a
`continuation of application No. 10/648.012, filed on
`Aug. 26, 2003, now Pat. No. 7,412.294, which is a
`continuation-in-part of application No. 10/027.391,
`filed on Dec. 21, 2001, now abandoned.
`
`(51)
`
`(52)
`(58)
`
`Int. C.
`(2006.01)
`G06F I7/00
`U.S. Cl. ......................................................... 700/94
`Field of Classification Search ........................ None
`See application file for complete search history.
`
`
`
`Petitioner's Exhibit 1001
`Page 001
`
`

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`U.S. Patent
`US. Patent
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`Mar. 6, 2012
`Mar. 6, 2012
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`Sheet 1 of 3
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`US 8,131,391 B2
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`Petitioner's Exhibit 1001
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`Page 002
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`Petitioner's Exhibit 1001
`Page 002
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`

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`U.S. Patent
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`Mar. 6, 2012
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`Sheet 2 of 3
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`US 8, 131,391 B2
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`1.
`WIRELESS DIGITAL AUDIO MUSC SYSTEM
`
`This continuation application claims the benefit of U.S.
`patent application Ser. No. 12/570,343, file Sep. 30, 2009,
`now U.S. Pat. No. 7,865,258, which was a continuation appli
`cation claiming the benefit of U.S. patent application Ser. No.
`12/144,729 filed Jul 12, 2008, now U.S. Pat. No. 7,684.885,
`which was a continuation claiming benefit of U.S. patent
`application Ser. No. 10/648,012 filed Aug. 26, 2003, now U.S.
`Pat. No. 7,412.294, which was a continuation-in-part claim
`ing benefit from U.S. patent application Ser. No. 10/027.391,
`filed Dec. 21, 2001, now abandoned, for “Wireless Digital
`Audio System.” published under US 2003/0118196 A1 on
`Jun. 26, 2003, now abandoned, the disclosures of which are
`incorporated herein in their entireties by reference.
`
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`BACKGROUND OF THE INVENTION
`
`2
`transmitted audio signal. The wireless digital audio music
`system provides private listening without interference from
`other users or wireless devices and without the use of con
`ventional cable connections.
`These and other features, aspects and advantages of the
`present invention will become better understood with refer
`ence to the following drawings, description and claims.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`Some aspects of the present invention are generally shown
`by way of reference to the accompanying drawings in which:
`FIG. 1 schematically illustrates a wireless digital audio
`system in accordance with the present invention;
`FIG. 2 is a block diagram of an audio transmitter portion of
`the wireless digital audio system of FIG. 1;
`FIG.3 is a block diagram of an audio receiverportion of the
`wireless digital audio system of FIG. 1; and
`FIG. 4 is an exemplary graph showing the utilization of an
`embedded fuzzy logic coding algorithm according to one
`embodiment of the present invention.
`
`DETAILED DESCRIPTION
`
`The following detailed description is the best currently
`contemplated modes for carrying out the invention. The
`description is not to be taken in a limiting sense, but is made
`merely for the purpose of illustrating the general principles of
`the invention.
`Referring to FIGS. 1 through 3, a wireless digital audio
`music system 10 may include a battery powered transmitter
`20 connected to a portable music audio player or music audio
`source 80. The battery powered wireless digital audio music
`transmitter 20 utilizes an analog to digital converter or ADC
`32 and may be connected to the music audio Source 80 analog
`headphone jack 82 using a headphone plug. 22. The battery
`powered transmitter 20 may have a transmitting antenna 24
`that may be omni-directional for transmitting a spread spec
`trum modulated signal to a receiving antenna 52 of a battery
`powered headphone receiver 50. The battery powered
`receiver 50 may have headphone speakers 75 in headphones
`55 for listening to the spread spectrum demodulated and
`decoded communication signal. In the headphone receiver
`50, fuzzy logic detection may be used to optimize reception of
`the received user code. The transmitter 20 may digitize the
`audio signal using ADC 32. The digitized signal may be
`processed downstream by an encoder 36. After digital con
`version, the digital signal may be processed by a digital low
`pass filter. To reduce the effects of channel noise, the battery
`powered transmitter 20 may use a channel encoder 38. A
`modulator 42 modulates the digital signal to be transmitted.
`For further noise immunity, a spread spectrum DPSK (differ
`ential phase shift key) transmitter or module 48, is utilized.
`The battery powered transmitter 20 may contain a code gen
`erator 44 that may be used to create a unique user code. The
`unique user code generated is specifically associated with one
`wireless digital audio system user, and it is the only code
`recognized by the battery powered headphone receiver 50
`operated by a particular user. The radio frequency (RF) spec
`trum utilized (as taken from the Industrial, Scientific and
`Medical (ISM) band) may be approximately 2.4 GHz. The
`power radiated by the transmitter adheres to the ISM stan
`dard.
`Particularly, the received spread spectrum signal may be
`communicated to a 2.4 GHz direct conversion receiver or
`module 56. Referring to FIGS. 1 through 4, the spread spec
`trum modulated signal from transmit antenna 24 may be
`
`This invention relates to audio player devices and more
`particularly to systems that include headphone listening
`devices. The new audio system uses an existing headphone
`jack (i.e., this is the standard analog headphone jack that
`connects to wired headphones) of a music audio player (i.e.,
`portable CD player, portable cassette player, portable A.M./
`F.M. radio, laptop/desktop computer, portable MP3 player,
`and the like) to connect a battery powered transmitter for
`wireless transmission of a signal to a set of battery powered
`receiving headphones.
`Use of audio headphones with audio player devices such as
`portable CD players, portable cassette players, portable A.M./
`F.M. radios, laptop/desktop computers, portable MP3 players
`and the like have been in use for many years. These systems
`incorporate an audio source having an analog headphonejack
`to which headphones may be connected by wire.
`There are also known wireless headphones that may
`receive A.M. and F.M. radio transmissions. However, they do
`not allow use of a simple plug in (i.e., plug in to the existing
`analog audio headphonejack) battery powered transmitter for
`connection to any music audio player devicejack, such as the
`above mentioned music audio player devices, for coded wire
`less transmission and reception by headphones of audio
`music for private listening without interference where mul
`tiple users occupying the same space are operating wireless
`transmission devices. Existing audio systems make use of
`electrical wire connections between the audio source and the
`45
`headphones to accomplish private listening to multiple users.
`There is a need for a battery powered simple connection
`system for existing music audio player devices (i.e., the pre
`viously mentioned music devices), to allow coded digital
`wireless transmission (using a battery powered transmitter) to
`aheadphone receiver (using a battery powered receiverhead
`phones) that accomplishes private listening to multiple users
`occupying the same space without the use of wires.
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`SUMMARY OF THE INVENTION
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`55
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`The present invention is generally directed to a wireless
`digital audio system for coded digital transmission of an
`audio signal from any audio player with an analog headphone
`jack to a receiver headphone located away from the audio
`player. FuZZy logic technology may be utilized by the system
`to enhance bit detection. A battery-powered digital transmit
`ter may include a headphone plugin communication with any
`Suitable music audio Source. For reception, a battery-powered
`headphone receiver may use embedded fuZZy logic to
`enhance user codebit detection. FuZZylogic detection may be
`used to enhance user code bit detection during decoding of the
`
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`Petitioner's Exhibit 1001
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`3
`received by receiving antenna 52 and then processed by
`spread spectrum direct conversion receiver or module 56 with
`a receiver code generator 60 that contains the same transmit
`ted unique code, in the battery powered receiver 50 head
`phones. The transmitted signal from antenna 24 may be
`received by receiving antenna 52 and communicated to a
`wideband bandpass filter (BPF). The battery powered
`receiver 50 may utilize embedded fuzzy logic 61 (as graphi
`cally depicted in FIGS. 1, 4) to optimize the bit detection of
`the received user code. The down converted output signal of
`direct conversion receiver or module 56 may be summed by
`receiver summing element 58 with a receiver code generator
`60 signal. The receiver code generator 60 may contain the
`same unique wireless transmission of a signal code word that
`was transmitted by audio transmitter 20 specific to a particu
`lar user. Other code words from wireless digital audio sys
`tems 10 may appear as noise to audio receiver 50. This may
`also be true for other device transmitted wireless signals
`operating in the wireless digital audio spectrum of digital
`audio system 10. This code division multiple access (CDMA)
`may be used to provide each user independent audible enjoy
`ment. The resulting Summed digital signal from receiving
`summary element 58 and direct conversion receiver or mod
`ule 56 may be processed by a 64-Ary demodulator 62 to
`demodulate the signal elements modulated in the audio trans
`mitter 20. A block de-interleaver 64 may then decode the bits
`of the digital signal encoded in the block interleaver 40.
`Following such, a Viterbi decoder 66 may be used to decode
`the bits encoded by the channel encoder 38 in audio transmit
`ter 20. A source decoder 68 may further decode the coding
`applied by encoder 36.
`Each receiver headphone 50 user may be able to listen
`(privately) to high fidelity audio music, using any of the audio
`devices listed previously, without the use of wires, and with
`out interference from any other receiver headphone 50 user,
`even when operated within a shared space. The fuzzy logic
`detection technique 61 used in the receiver 50 could provide
`greater user separation through optimizing code division in
`the headphone receiver.
`The battery powered transmitter 20 sends the audio music
`information to the battery powered receiver 50 in digital
`packet format. These packets may flow to create a digital bit
`stream rate less than or equal to 1.0 Mbps.
`The user code bits in each packet may be received and
`detected by a fuZZy logic detection Sub-system 61 (as an
`option) embedded in the headphone receiver 50 to optimize
`audio receiver performance. For each consecutive packet
`received, the fuzzy logic detection Sub-System 61 may com
`pute a conditional density with respect to the context and
`fuzziness of the user code vector, i.e., the received code bits in
`each packet. FuZZiness may describe the ambiguity of the
`high (1)/low (0 or -1) event in the received user code within
`the packet. The fuzzy logic detection Sub-system 61 may
`measure the degree to which a high/low bit occurs in the user
`code vector, which produces a low probability of bit error in
`the presence of noise. The fuzzy logic detection Sub-system
`61 may use a set of if-then rules to map the user codebit inputs
`to validation outputs. These rules may be developed as if-then
`StatementS.
`Fuzzy logic detection sub-system 61 in battery-powered
`headphone receiver 50 utilizes the if-then fuzzy set to map the
`received user code bits into two values: a low (0 or -1) and a
`high (1). Thus, as the user code bits are received, the “if rules
`map the signal bit energy to the fuzzy set low value to some
`degree and to the fuzzy set high value to Some degree. FIG. 4
`graphically shows that X-value -1 equals the maximum low
`bit energy representation and X-value 1 equals the maximum
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`high bit energy representation. Due to additive noise, the user
`code bit energy may have some membership to a low and high
`as represented in FIG. 4. The if-part fuzzy set may determine
`if each bit in the user code, for every received packet, has a
`greater membership to a high bit representation or a low bit
`representation. The more a user code bit energy fits into the
`high or low representation, the closer its Subsethood, i.e., a
`measure of the membership degree to which a set may be a
`Subset of another set, may be to one.
`The if-then rule parts that makeup the fuzzy logic detection
`sub-system 61 must be followed by a defuZZifying operation.
`This operation reduces the aforementioned fuzzy set to a bit
`energy representation (i.e., -1 or 1) that is received by the
`transmitted packet. Fuzzy logic detection Sub-system 61 may
`be used in battery-powered headphone receiver 50 to enhance
`overall system performance.
`The next step may process the digital signal to return the
`signal to analog or base band format for use in powering
`speaker(s) 75. A digital-to-analog converter 70 (DAC) may be
`used to transform the digital signal to an analog audio signal.
`An analog low pass filter 72 may be used to filter the analog
`audio music signal to pass a signal in the approximate 20 HZ
`to 20 kHz frequency range and filter other frequencies. The
`analog audio music signal may then be processed by a power
`amplifier 74 that may be optimized for powering headphone
`speakers 75 to provide a high quality, low distortion audio
`music for audible enjoyment by a user wearing headphones
`55. A person skilled in the art would appreciate that some of
`the embodiments described hereinabove are merely illustra
`tive of the general principles of the present invention. Other
`modifications or variations may be employed that are within
`the scope of the invention. Thus, by way of example, but not
`of limitation, alternative configurations may be utilized in
`accordance with the teachings herein. Accordingly, the draw
`ings and description are illustrative and not meant to be a
`limitation thereof.
`Moreover, all terms should be interpreted in the broadest
`possible manner consistent with the context. In particular, the
`terms “comprises” and "comprising should be interpreted as
`referring to elements, components, or steps in a non-exclusive
`manner, indicating that the referenced elements, components,
`or steps may be present, or utilized, or combined with other
`elements, components, or steps that are not expressly refer
`enced. Thus, it is intended that the invention coverall embodi
`ments and variations thereof as long as such embodiments
`and variations come within the scope of the appended claims
`and their equivalents.
`I claim:
`1. A wireless digital audio headphone comprising:
`a portable digital audio headphone receiver configured to
`receive a unique user code bit sequence and a original
`audio signal representation in the form of packets, said
`digital audio headphone receiver, capable of mobile
`operation and configured for direct digital wireless
`spread spectrum communication with a mobile digital
`audio transmitter,
`a direct conversion module configured to capture pack
`ets and the correct bit sequence within the packets
`aided by lowering signal detection error through
`reduced intersymbol interference coding of said audio
`representation signal respective to said headphone
`receiver and said mobile digital audio transmitter, said
`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;
`
`Petitioner's Exhibit 1001
`Page 006
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`5
`a decoder operative to decode reduced intersymbol
`interference coding of original audio signal represen
`tation;
`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 in response to the unique user code bit
`sequence being recognized, said audio having been
`wirelessly transmitted and reproduced virtually free
`from interference from device transmitted signals
`operating in the wireless headphone spectrum.
`2. A wireless digital audio headphone for receipt of a
`unique user code and a digital audio music representation
`signal in the form of a packet, said wireless digital audio
`headphone comprising:
`a digital audio receiver, capable of mobile operation, con
`figured for direct digital wireless spread spectrum com
`munication with a mobile digital audio transmitter,
`a direct conversion module configured to capture packets
`and the correct bit sequence within the packets aided by
`lowering signal detection error through reduced
`intersymbol interference coding of said audio music
`representation signal respective to said headphone and
`said mobile digital audio transmitter, said packets
`embedded in the received spread spectrum signal, the
`captured packets corresponding to the unique user code:
`a digital demodulator module configured for independent
`code division multiple access (CDMA) communication
`operation;
`an interleaver to reduce transmission errors; and
`a decoder operative to decode the applied reduced
`intersymbol interference coding of said audio music
`representation signal; and
`a digital-to-analog converter (DAC) generating an audio
`output of said digital audio music representation signal;
`and a module adapted to reproduce said generated audio
`output, in response to the unique user code bit sequence
`is being recognized, said audio having been wirelessly
`transmitted and reproduced virtually free from interfer
`ence from device transmitted signals operating in the
`wireless headphone spectrum.
`3. A portable wireless digital audio system for digital trans
`mission of an original audio signal representation from a
`portable audio player to a portable digital audio headphone
`receiver, said portable wireless digital audio system compris
`ing:
`a digital audio transmitter operatively coupled to said por
`table audio player and transmitting a unique user code
`bit sequence with said original audio signal representa
`tion in packet format, wherein said digital audio trans
`mitter operatively coupled to said audio player is
`capable of mobile operation, said digital audio transmit
`ter comprising:
`a 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 head
`phone receiver comprising:
`a direct conversion module configured to capture packets
`and the correct bit sequence within the packets aided by
`lowering signal detection error through reduced
`intersymbol interference coding of said audio represen
`tation signal respective to said headphone and mobile
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`said digital audio transmitter operatively coupled to said
`audio player, said packets embedded in the received
`spread spectrum signal, the captured packets corre
`sponding to the 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 digital-to-analog converter (DAC) generating an audio
`output of said original audio signal representation; and
`a module adapted to reproduce said generated audio out
`put, said audio having been wirelessly transmitted from
`said portable audio player and reproduced virtually free
`from interference from device transmitted signals oper
`ating in the wireless digital audio system spectrum.
`4. A portable wireless digital audio system for digital trans
`mission of an original audio signal representation from a
`portable audio player to a digital audio receiver, said portable
`wireless digital audio system comprising:
`a digital audio transmitter operatively coupled to said audio
`player and transmitting a unique user code with said
`original audio signal representation in packet format,
`wherein said digital audio transmitter coupled to said
`audio player is capable of being moved in any direction
`during operation, said digital audio transmitter compris
`ing:
`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 represen
`tation;
`said digital audio receiver capable of being moved in any
`direction during operation and in direct wireless com
`munication with said digital audio transmitter, said digi
`tal audio receiver comprising:
`a direct conversion module configured to capture packets
`and the correct bit sequence within the packets aided by
`lowering signal detection error through reduced
`intersymbol interference coding of said audio represen
`tation signal respective to said mobile digital audio
`receiver and mobile said digital audio transmitter opera
`tively coupled to said audio player, said packets embed
`ded 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 generating an audio output of
`said original audio signal representation; and
`a module adapted to reproduce said generated audio out
`put, said audio having been wirelessly transmitted from
`said audio player virtually free from interference from
`device transmitted signals operating in the wireless digi
`tal audio system spectrum.
`5. A wireless digital audio receiver, capable of mobile
`operation, configured to receive a unique user code and a
`original audio signal representation in the form of packets, the
`wireless digital audio receiver further configured to be
`directly communicable with a mobile digital audio transmit
`ter, said wireless digital audio receiver comprising:
`a direct conversion module configured to capture packets
`and the correct bit sequence within the packets aided by
`
`Petitioner's Exhibit 1001
`Page 007
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`US 8, 131,391 B2
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`7
`lowering signal detection error through reduced
`intersymbol interference coding of said audio represen
`tation signal respective to mobile said digital audio
`receiver and said mobile digital audio transmitter, said
`packets embedded in a received spread spectrum signal,
`the captured packets corresponding to the unique user
`code;
`a digital demodulator configured for independent code
`division multiple access communication operation;
`a decoder operative to decode reduced intersymbol inter
`ference coding of said original audio signal representa
`tion;
`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 out
`put, said audio having been wirelessly transmitted from
`a portable audio player virtually free from interference
`from device transmitted signals operating in the digital
`wireless audio receiver spectrum.
`6. A wireless digital audio headphone for receipt of a
`unique user code and a digital audio music representation
`signal in the form of a packet, said wireless digital audio
`headphone comprising:
`a mobile digital audio receiver configured for direct digital
`wireless communication with a mobile digital audio
`transmitter,
`a direct conversion module configured to capture packets
`and the correct bit sequence within the packets aided by
`lowering signal detection error through reduced
`intersymbol interference coding of said audio represen
`tation signal respective to said headphone and said
`mobile digital audio transmitter, said packets embedded
`in the received spread spectrum signal, the captured
`packets corresponding to the unique user code;
`a digital demodulator module configured for independent
`code division multiple access (CDMA) communication
`operation;
`a decoder operative to decode reduced intersymbol inter
`ference coding of said original audio signal representa
`tion; and
`a digital-to-analog converter (DAC) generating an audio
`output of said digital audio music representation signal;
`and a module adapted to reproduce said generated audio
`output, said audio having been wirelessly transmitted
`and reproduced virtually free from interference from
`device transmitted signals operating in the wireless
`headphone spectrum.
`7. A mobile wireless digital audio receiver, configured to
`receive a unique user code and a original audio signal repre
`sentation in the form of packets, said unique user code con
`figured to spread the spectrum of said signal and further
`configured for independent communication operation, the
`wireless digital audio receiver further configured to be
`directly communicable with a mobile digital audio transmit
`ter, said mobile wireless digital audio receiver comprising:
`fuzzy set membership functionality to enhance detection of
`said unique user code:
`a direct conversion module configured to capture packets
`and the correct bit sequence within the packets aided by
`lowering signal detection error through reduced
`intersymbol interference coding of said audio represen
`tation signal respective to said mobile digital audio
`receiver and said mobile digital audio transmitter, said
`packets embedded in the received spread spectrum sig
`nal, the captured packets corresponding to the unique
`user code;
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`a decoder operative to decode reduced intersymbol inter
`ference coding of said original audio signal representa
`tion;
`a digital-to-analog converter generating an audio output of
`said original audio signal representation; and
`a module adapted to reproduce said generated audio out
`put, said audio having been wirelessly transmitted from
`an audio player and reproduced virtually free from inter
`ference from device transmitted signals operating in the
`wireless digital audio receiver spectrum.
`8. A wireless digital audio headphone for receipt of a
`unique user code and a digital audio representation signal in
`the form of a packet, said unique user code configured to
`spread the spectrum of said signal and further configured for
`independent communication operation, the wireless digital
`audio headphone further configured to be directly communi
`cable with a mobile digital audio transmitter, said wireless
`digital audio headphone comprising:
`fuzzy set membership functionality to enhance detection of
`said unique user code:
`a direct conversion module configured to capture packets
`and the correct bit sequence within the packets aided by
`lowering signal detection error through reduced
`intersymbol interference coding of said audio represen
`tation signal respective to said headphone and said
`mobile digital audio transmitter, said packets embedded
`in the received spread spectrum signal, the captured
`packets corresponding to the unique user code;
`a decoder operative to decode reduced intersymbol inter
`ference coding of said original audio signal representa
`tion;
`a digital-to-analog converter generating an audio output of
`said original audio signal representation; and
`a module adapted to reproduce said generated audio out
`put, said audio having been wirelessly transmitted from
`an audio player and reproduced virtually free from inter
`ference from device transmitted signals operating in the
`wireless headphone spectrum.
`9. A mobile wireless digital audio receiver, configured to
`receive a unique user code and a original audio music signal
`representation in the form of packets, said unique user code
`configured to spread the spectrum of said music signal and
`further configured for independent communication opera
`tion, the wireless digital audio receiver further configured to
`be directly communicable with a mobile digital audio trans
`mitter, said mobile wireless digital audio receiver compris
`ing:
`fuzzy set membership functionality to enhance detection of
`said unique user code:
`a direct conversion module configured to capture packets
`and the correct bit sequence within the packets aided by
`lowering signal detection error through reduced
`intersymbol interference coding of said audio music
`representation signal respective to said mobile digital
`audio receiver and said mobile digital audio transmitter,
`said packets embedded in the received spread spectrum
`signal, the captured packets corresponding to the unique
`user code;
`a decoder operative to decode reduced intersymbol inter
`ference coding of said original audio signal representa
`tion;
`a digital-to-analog converter generating an audio output of
`said original audio signal representation; and
`a module adapted to reproduce said generated audio out
`put, said audio having been wirelessly transmitted from
`an audio player and reproduced virtually free from inter
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`Petitioner