USOO7865258B2
`
`(12) United States Patent
`Woolfork
`
`(10) Patent N0.:
`(45) Date of Patent:
`
`US 7,865,258 B2
`*Jan. 4, 2011
`
`(54) WIRELESS DIGITAL AUDIO SYSTEM
`
`6,678,892 B1
`
`1/2004 Lavelle et a1.
`
`(76) I
`nventor:
`
`P 1 A
`C E 1W If k 500 S
`. ar
`00 or ,
`anta au a ve.,
`Pasadena, CA (Us) 91107
`
`( * ) Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 0 days.
`
`6,781,977 B1* 8/2004 Li ............................ .. 370/335
`6,982,132 B1
`1/2006 Goldner
`7,505,823 B1
`3/2009 Bartlett et al.
`
`d)
`_
`(C
`ont1nue
`
`This patent 1s subject to a termmal d1s-
`c1a1mer.
`
`FOREIGN PATENT DOCUMENTS
`
`(21) Appl.No.: 12/570,343
`
`GB
`
`2252013 A
`
`7/1992
`
`(continued)
`OTHER PUBLICATIONS
`
`Microsoft Computer Dictionary de?nition for Code Division Multi
`plex Access, copynght 2002.*
`
`(Continued)
`
`_
`_
`Pr’mary Exam’”er*Andr_eW C Flanders
`(74) Attorney, Agent, or FzrmiMegan E. Lyman
`
`(57)
`
`ABSTRACT
`
`(22) Filed:
`
`Sep. 30, 2009
`
`(65)
`
`Prior Publication Data
`us 2010/0014698 A1
`Jan. 21, 2010
`
`Related U_s_ Application Data
`
`(63) Continuation of application No. 12/ 144,729, ?led on
`Jul. 12, 2008, now Pat. No. 7,684,885, which is a
`continuation of application No. 10/648,012, ?led on
`Aug. 26, 2003, now Pat. No. 7,412,294.
`
`(51) Int. Cl.
`(2006.01)
`6an 17/00
`(52) US. Cl. ...................................................... .. 700/94
`
`(58) Field of Classi?cation Search ..................... .. None
`
`See application ?le for complete search history
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`
`5,491,839 A
`5,668,880 A
`5,721,783 A
`5,771,441 A *
`5,781,542 A
`5,790,595 A
`5,946,343 A
`6,115,478 A
`6,236,862 B1
`6,342,844 B1
`6,418,558 B1
`
`2/1996 Schotz
`9/1997 Alajajian
`2/1998 Anderson
`6/1998 Altstatt .................... .. 455/661
`7/1998 Tanaka
`8/1998 Benthin
`8/1999 Schotz
`9/2000 Schneider
`5/2001 EIten et a1.
`1/2002 Rozin
`7/2002 Roberts
`
`_
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`_
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`_
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`_
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`_
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`_
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`A W1reless d1g1tal audlo system 1nc1udes a portable audlo
`source W1th a d1g1tal audlo transm1tter operat1vely coupled
`thereto and an audio receiver operatively coupled to a head
`phone set. The audio receiver is con?gured 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 con?gured 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.
`
`13 Claims, 3 Drawing Sheets
`
`10
`
`SONY EXHIBIT 1001 - 0001
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`

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`US 7,865,258 B2
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`U.S. PATENT DOCUMENTS
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`OTHER PUBLICATIONS
`
`2003/0045235 A1
`2004/0223622 A1
`
`3/2003 Mooney
`11/2004 Lindemann
`
`FOREIGN PATENT DOCUMENTS
`
`W00076272 A1
`W00133836 A1
`
`12/2000
`5/2001
`
`American National Standard for Methods of Measurement of Com
`patibility Between Wireless Communication Devices and Hearing
`AidsiANSI C63. 19-2001.
`A Conferencing Spread Spectrum Radio, KM Lye, TT Tjhung, KC
`Chua, TC Pek, WH Yung, WP Goh, YP Chia, WK Loh, FL Ma, KM
`Low, 1994.
`Speci?cation of the Bluetooth System, Version 1.0 B, pp. 17-27,
`4144, 81-86, 143-147, Nov. 20, 1999.
`
`* cited by examiner
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`SONY EXHIBIT 1001 - 0002
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`US. Patent
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`Jan. 4, 2011
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`US 7,865,258 B2
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`SONY EXHIBIT 1001 - 0003
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`US. Patent
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`Jan. 4, 2011
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`US 7,865,258 B2
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`SONY EXHIBIT 1001 - 0004
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`U.S. Patent
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`Jan. 4, 2011
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`US 7,865,258 132
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`SONY EXHIBIT 1001 - 0005
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`SONY EXHIBIT 1001 - 0005
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`US 7,865,258 B2
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`1
`WIRELESS DIGITAL AUDIO SYSTEM
`
`This continuation application claims the bene?t of US.
`patent application Ser. No. 12/144,729 ?led Jul. 12, 2008,
`which claimed bene?t of US. patent application Ser. No.
`10/648,012 ?led Aug. 26, 2003, which claimed bene?t from
`US. patent application Ser. No. 10/027,391, ?led Dec. 21,
`2001, for “Wireless Digital Audio System,” published under
`US 2003/01 18196A1 on Jun. 26, 2003, now abandoned, both
`of which are incorporated herein in their entirety by refer
`ence.
`
`BACKGROUND OF THE INVENTION
`
`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./
`FM. 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, portableA.M./
`EM. 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 headphone jack
`to which headphones may be connected by wire.
`There are also known wireless headphones that may
`receive AM. and FM. radio transmissions. However, they do
`not allow use of a simple plug in (i.e., plug in to the existing
`analog audio headphone jack) battery powered transmitter for
`connection to any music audio player device jack, 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
`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
`a headphone receiver (using a battery powered receiver head
`phones) that accomplishes private listening to multiple users
`occupying the same space without the use of wires.
`
`SUMMARY OF THE INVENTION
`
`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 plug in communication with any
`suitable music audio source. For reception, a battery-powered
`headphone receiver may use embedded fuzzy logic to
`enhance user code bit detection. Fuzzy logic detection may be
`used to enhance user code bit detection during decoding of the
`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.
`
`2
`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
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`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 ?lter. 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 speci?cally 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, Scienti?c 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
`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
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`SONY EXHIBIT 1001 - 0006
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`US 7,865,258 B2
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`3
`phones. The transmitted signal from antenna 24 may be
`received by receiving antenna 52 and communicated to a
`wideband bandpass ?lter (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 speci?c 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 enj oy
`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 ?delity 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 ?ow 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 (l)/ 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 code bit 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
`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
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`greater membership to a high bit representation or a low bit
`representation. The more a user code bit energy ?ts 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 make up 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., —l 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 ?lter 72 may be used to ?lter the analog
`audio music signal to pass a signal in the approximate 20 Hz
`to 20 kHz frequency range and ?lter other frequencies. The
`analog audio music signal may then be processed by a power
`ampli?er 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
`modi?cations or variations may be employed that are within
`the scope of the invention. Thus, by way of example, but not
`of limitation, alternative con?gurations 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 cover all 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 portable wireless digital audio system for digital trans
`mission of an original audio signal representation from a
`portable audio source to a portable digital audio headphone
`receiver, said portable wireless digital audio system compris
`ing:
`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 con?gured for independent code divi
`sion multiple access (CDMA) communication opera
`tion;
`said digital audio transmitter con?gured for direct digital
`wireless communication with said portable digital audio
`headphone receiver, wherein said headphone receiver is
`con?gured to receive said unique user code with said
`original audio signal representation in packet format,
`said portable digital audio headphone receiver compris
`1ng:
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`SONY EXHIBIT 1001 - 0007
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`an embedded fuzzy logic detector Wherein the fuzzy
`logic detector activates fuzzy logic rules andperforms
`a defuzzi?cation operation to enhance detection of the
`unique user code;
`a digital demodulator con?gured 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 out
`put.
`2. A Wireless digital audio headphone comprising:
`a digital audio receiver con?gured to receive a unique user
`code bit sequence and a original audio signal represen
`tation in the form of packets;
`an embedded fuzzy logic detector Wherein the fuzzy logic
`detector activates fuzzy logic rules and performs a
`defuzzi?cation 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 representa
`tion; and
`a module adapted to reproduce said generated audio out
`put.
`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 head
`phone receiver, said portable Wireless digital audio system
`comprising:
`a digital audio transmitter operatively coupled to said por
`table audio source 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 source is
`capable of mobile operation, said digital audio transmit
`ter comprising:
`an encoder operative to encode said original audio signal
`representation to reduce intersymbol interference;
`a digital modulator module con?gured for independent
`CDMA communication operation;
`said digital audio transmitter con?gured for direct digital
`Wireless communication With said portable digital audio
`headphone receiver, said portable digital audio head
`phone receiver comprising:
`a direct conversion module con?gured to capture packets
`embedded in the received spread spectrum signal, the
`captured packets corresponding to the unique user code
`bit sequence;
`a digital demodulator con?gured for independent CDMA
`communication operation;
`50
`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 source and reproduced virtually free
`from interference.
`4. A portable Wireless digital audio system for digital trans
`mission of an original audio signal representation from a
`portable audio source 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 source and transmitting a unique user code
`bit sequence With said original audio signal representa
`
`6
`tion in packet format, Wherein said digital audio trans
`mitter operatively coupled to said audio source is
`capable of mobile operation, said digital audio transmit
`ter 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 con?gured for independent code division mul
`tiple access (CDMA) communication operation;
`said digital audio transmitter con?gured for direct digi
`tal Wireless communication With said portable digital
`audio headphone receiver, said portable digital audio
`headphone receiver comprising:
`a direct conversion module con?gured to capture pack
`ets embedded in the received spread spectrum signal,
`the captured packets corresponding to the unique user
`code bit sequence;
`a digital demodulator con?gured for independent
`CDMA communication operation;
`a viterbi decoder and de-interleaver generating a corre
`sponding 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 operat
`ing in the portable Wireless digital audio system spec
`trum.
`5. A portable Wireless digital audio system for digital trans
`mission of an original audio signal representation from a
`portable audio source 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 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 con?gured for independent code divi
`sion multiple access (CDMA) communication operation
`said digital audio transmitter con?gured for direct digi
`tal 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
`defuzzi?cation operation to enhance detection of the
`unique user code;
`a direct conversion module con?gured to capture packets
`embedded in the received spread spectrum signal, the
`captured packets corresponding to the detected unique
`user code;
`a digital demodulator con?gured for independent CDMA
`communication operation;
`a decoder operative to decode the applied reduced
`intersymbol interference coding of said original audio
`signal representation;
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`SONY EXHIBIT 1001 - 0008
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`US 7,865,258 B2
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`7
`a module adapted to reproduce audio of said original audio
`signal representation.
`6. A portable Wireless digital audio system for digital trans
`mission of an original audio signal representation from a
`portable audio source to a digital audio headphone, said por
`table Wireless digital audio system comprising:
`a digital audio transmitter operatively coupled to said por
`table audio source and transmitting a unique user code
`bit sequence With said original audio signal representa
`tion in packet format, Wherein said digital audio trans
`mitter 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 con?gured for independent code division mul
`tiple access (CDMA) communication operation; said
`digital audio transmitter con?gured 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
`defuzzi?cation operation to enhance detection of the
`unique user code bit sequence;
`a direct conversion module con?gured to capture pack
`ets embedded in the received spread spectrum signal,
`the captured packets corresponding to the detected
`unique user code bit sequence;
`a digital demodulator con?gured 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 trans
`mission 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 con?gured to transmit a unique user code
`With the original audio representation;
`a mobile digital audio receiver con?gured 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 andperforms
`a defuzzi?cation 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 trans
`mission of an original audio signal representation from a
`portable audio source to a digital audio headphone, said por
`table Wireless digital audio system comprising:
`a portable digital audio transmitter con?gured to couple to
`said portable audio source and transmitting a unique
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`user code bit sequence With said original audio signal
`representation in packet format, said digital audio trans
`mitter comprising:
`an encoder operative to encode said original audio signal
`representation to reduce intersymbol interference; and
`a digital modulator con?gured for independent code divi
`sion multiple access (CDMA) communication opera
`tion; and said portable digital audio transmitter con?g
`ured for direct digital Wireless communication With said
`digital audio headphone, said digital audio headphone
`comprising:
`a direct conversion module con?gured to capture packets
`embedded in the received spread spectrum signal, the
`captured packets corresponding to the unique user code
`bit sequence;
`a digital demodulator con?gured 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 source virtually free from interfer
`ence 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
`defuzzi?cation operation in response to a received
`unique user code to enhance detection of the unique user
`code;
`a direct conversion module being con?gured 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 sig
`nal is recognized, said audio output having been Wire
`lessly transmitted, said audio output reproduced virtu
`ally 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 direc
`tion 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 con?gured 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:
`
`SONY EXHIBIT 1001 - 0009
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`

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`US 7,865,258 B2
`
`9
`a direct conversion module con?gured to capture packets
`embedded in the received spread spectrum signal, the
`captured packets corresponding to the unique user code;
`a digital demodulator con?gured for independent CDMA
`communication operation;
`an de-interleaver generating a corresponding digital out
`Put;
`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 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 rece