US009 107000B2
`
`(12) United States Patent
`Woolfork
`
`(10) Patent No.:
`(45) Date of Patent:
`
`US 9,107,000 B2
`*Aug. 11, 2015
`
`(54) WIRELESS DIGITAL AUDIO MUSIC SYSTEM
`(75) Inventor: C. Earl Woolfork, Pasadena, CA (US)
`
`(56)
`
`References Cited
`U.S. PATENT DOCUMENTS
`
`rsr rr
`(73) 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 153 days.
`This patent is Subject to a terminal dis-
`claimer.
`
`(21) Appl. No.: 13/356,949
`(22) Filed:
`Jan. 24, 2012
`
`(65)
`
`Prior Publication Data
`US 2012/O128171 A1
`MaV 24, 2012
`y 24,
`Related U.S. Application Data
`(63) Continuation of application No. 12/940,747, filed on
`Nov. 5, 2010, now Pat. No. 8,131,391, which is a
`
`Syster, N.E.,
`
`continuation of application No. 12/144.729, filed on
`Jul. 12, 2008, now Pat. No. 7,684.885, which is a
`says priation, '''El O
`I
`t
`-: ty
`f
`ti N 80 3.
`Eo R inter
`s--- us
`• 1- us
`s
`
`
`
`5,491,839 A * 2/1996 SE . . .
`
`.
`
`.
`
`.
`
`.
`
`.
`
`.
`
`.
`
`.
`
`.
`
`.
`
`.
`
`9/1991 Saleh
`5,048,057 A
`5,175,558 A 12/1992 DuPree ......................... 342,378
`5,420,585 A
`5, 1995 Ad
`
`5,506,861 A
`4/1996 Bottomley
`5,539,769 A
`7/1996 Kosko
`(Continued)
`FOREIGN PATENT DOCUMENTS
`
`.
`
`.
`
`.
`
`.
`
`.
`
`.
`
`.
`
`.
`
`.
`
`.
`
`.
`
`.
`
`. 455,39
`
`EP
`GB
`
`O840465 A2
`2261347 A
`
`5, 1998
`5, 1993
`
`OTHER PUBLICATIONS
`
`Bluetooth Specification version 1.1, Bluetooth SIG, www.bluetooth.
`com, Feb. 22, 2001.
`
`(Continued)
`
`Primary Examiner — Andrew C Flanders
`
`(74) Attorney Agent or Firm Megan E. 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
`(51) Int. Cl
`audio receiver utilizes fuZZy logic to optimize digital signal
`Goof i7/00
`processing. Each of the digital audio transmitter and receiver
`H04R L/10
`is configured for code division multiple access (CDMA) com
`HO4R5/033
`munication. The wireless digital audio system allows private
`(52) U.S. Cl
`audio enjoyment without interference from other users of
`AV e. we
`CPC .............. lette. 9.3%66. independent wireless digital transmitters and receivers shar
`•
`u. fs
`ing th
`(58) Field of Classification Search
`1ng the same Space
`USPC ............................................................ 7OO/94
`See application file for complete search history.
`
`12 Claims, 3 Drawing Sheets
`
`(2006.01)
`(200 6. 01)
`(2006.015
`
`
`
`-o-d
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`ONE-E-WAY 2003
`Apple v. One-E-Way
`IPR2021-00283
`
`001
`
`

`

`US 9,107,000 B2
`Page 2
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`5,668,880 A
`9/1997 Alajajian
`5,721,783 A
`2f1998 Anderson
`5,771,441 A * 6/1998 Altstatt ........................ 455/66.1
`5,778,022 A
`7/1998 Walley
`5,781,542 A * 7/1998 Tanaka et al. ................. 370,342
`5,822,440 A 10/1998 Oltman
`5,946,343 A * 8/1999 Schotz et al. ................. 375,141
`5,963,583 A 10, 1999 Davidovici
`6,028,764 A
`2/2000 Richardson
`6,072,770 A
`6, 2000 H.O.
`6,097,711 A
`8, 2000 Okawa
`6,104,913 A
`8, 2000 McAllister
`6,115,478 A
`9, 2000 Schneider
`6,130,643 A * 10/2000 Trippett et al. ............... 342,380
`6,236,862 B1
`5, 2001 Erten et al.
`6,317.039 B1* 11/2001 Thomason .................... 340/.505
`6,339.706 B1
`1/2002 Tillgren
`6,366,662 B1
`4/2002 Giordano
`6,373,791 B1
`4/2002 Ukita
`6,381,053 B1
`4/2002 Fathallah
`6,418,558 B1* 7/2002 Roberts et al. ................ 725/129
`6.424,820 B1* 7/2002 Burdick et al
`455,411
`6,456,645 B1* 9/2002 Kurrat .........
`375,140
`6,678,892 B1* 1/2004 Lavelle et al. .................. 725/75
`6,781,977 B1 * 8/2004 Li ................................. 370,335
`6,898,585 B2 * 5/2005 Benson et al. .................. 7O6/52
`6,978,162 B2 12/2005 Russell
`6,982,132 B1* 1/2006 Goldner et al. ............... 429,162
`7,035,788 B1
`4/2006 Nakajima
`7,047,474 B2 *
`5/2006 Rhee et al. .................... 714/755
`7,099.413 B2 * 8/2006 Chuang et al. ................ 375/347
`7,187,948 B2
`3, 2007 Alden
`
`
`
`5, 2007 Lee
`7,215,269 B2
`9, 2007 to
`7,272.410 B2
`7,277,520 B2 10/2007 Kusubashi
`7,292.880 B2 11/2007 Lehtonen
`7,295.809 B2 11/2007 Moore
`7,369,532 B2
`5/2008 Silvester
`7.460,477 B2 12/2008 Yata et al.
`7.467,344 B2 12/2008 Banerjee
`7,505,823 B1
`3/2009 Bartlett
`7,890,661 B2
`2/2011 Spurgat
`2001/0025358 A1* 9, 2001 Eidson et al. ................. 714,752
`2002fOO39424 A1
`4/2002 Watanuki
`2002fOO6861.0 A1
`6/2002 Anvekar
`2002fO080288 A1
`6/2002 Davies
`2002/0098878 A1
`7/2002 Mooney
`2003. O13001.6 A1
`7/2003 Matsuura
`2003/0223604 Al 12/2003 Nakagawa
`2004/O107271 A1
`6, 2004 Ahn
`2004/0215808 A1 10, 2004 Homma
`2004/0223622 A1* 11/2004 Lindemann et al. ............ 381.79
`2004/0242278 A1 12/2004 Tomoda
`OTHER PUBLICATIONS
`
`Bluetooth Specification Version 1.0b, www.bluetooth.com, Dec. 1,
`1999.
`Mettala, Riku, Bluetooth Protocol Architecture version 1.0 White
`Paper, www.bluetooth.com.
`Haartsen, Jaap, Bluetooth The universal radio interface for ad hoc
`wireless connectivity, Ericsson Review No. 3, 1998.
`Haartsen, Jaap, Bluetooth Radio System, Ericsson Radio Systems,
`B.V. Feb. 2000.
`Anthony Ephremides, WTEC Study on Wireless Technologies and
`Information Systems, Jul. 2000.
`
`* cited by examiner
`
`ONE-E-WAY 2003
`Apple v. One-E-Way
`IPR2021-00283
`
`002
`
`

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`U.S. Patent
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`Aug. 11, 2015
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`ONE-E-WAY 2003
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`U.S. Patent
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`US 9,107,000 B2
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`ONE-E-WAY 2003
`Apple v. One-E-Way
`IPR2021-00283
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`U.S. Patent
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`Aug. 11, 2015
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`Sheet 3 of 3
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`US 9,107,000 B2
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`S.
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`wi
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`x
`oo: oo N to a rice r el O
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`ONE-E-WAY 2003
`Apple v. One-E-Way
`IPR2021-00283
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`005
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`

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`1.
`WIRELESS DIGITAL AUDIO MUSC SYSTEM
`
`US 9,107,000 B2
`
`This continuation application claims the benefit of U.S.
`patent application Ser. No. 12/940,747, which was a continu
`ation application claiming the benefit of U.S. patent applica
`tion Ser. No. 12/570,343 filed Sep. 30, 2009, now U.S. Pat.
`No. 7,865,258, which was a continuation 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 claiming benefit from U.S. patent
`application Ser. No. 10/027.391, filed Dec. 21, 2001, for
`“Wireless Digital Audio System.” published under US 2003/
`0118196 A1 on Jun. 26, 2003, now abandoned, the disclo
`sures of which are incorporated herein in their entireties by
`reference.
`
`10
`
`15
`
`BACKGROUND OF THE INVENTION
`
`25
`
`30
`
`35
`
`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
`45
`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
`aheadphone receiver (using a battery powered receiverhead
`phones) that accomplishes private listening to multiple users
`occupying the same space without the use of wires.
`
`40
`
`50
`
`55
`
`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 plugin communication with any
`Suitable music audio Source. For reception, a battery-powered
`headphone receiver may use embedded fuZZy logic to
`
`60
`
`65
`
`2
`enhance user codebit detection. FuZZylogic detection may be
`used to enhance user codebit 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.
`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
`
`ONE-E-WAY 2003
`Apple v. One-E-Way
`IPR2021-00283
`
`006
`
`

`

`US 9,107,000 B2
`
`10
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`15
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`3
`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
`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
`25
`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
`50
`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
`
`30
`
`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
`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 mobile wireless digital audio receiver, configured to
`receive a unique user code and an original audio signal rep
`resentation in the form of packets, said unique user code used
`to spread a spectrum of said signal and further configured for
`independent CDMA communication operation, said receiver
`independent of the operation of another receiver, said mobile
`wireless digital audio receiver comprising:
`a direct conversion module configured to capture packets
`and a correct bit sequence within the packets aided by
`lowering signal detection error through reduced
`intersymbol interference coding of said original audio
`signal representation, said packets embedded in the
`received spread spectrum signal, the captured packets
`corresponding to the unique user code;
`a decoder operative to decode the reduced intersymbol
`interference coding of said original audio signal repre
`sentation wherein each user has their audio receiver
`
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`ONE-E-WAY 2003
`Apple v. One-E-Way
`IPR2021-00283
`
`007
`
`

`

`US 9,107,000 B2
`
`5
`configured to communicate with their own separate
`audio transmitter, and said receiver virtually free from
`interference from transmission and reception device sig
`nals operating in the shared spectrum.
`2. A wireless digital audio headphone for receipt of a
`unique user code and a digital audio signal representation in
`the form of a packet, said unique user code used to spread a
`spectrum of said signal and further configured for indepen
`dent CDMA communication operation, said headphone inde
`pendent of the operation of another headphone, said wireless
`digital audio headphone 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 digital audio
`signal representation, said packets embedded in the
`received spread spectrum signal, the captured packets
`corresponding to the unique user code;
`a decoder operative to decode the reduced intersymbol
`interference coding of said original audio signal repre
`sentation;
`a digital-to-analog converter generating an audio output of
`said original audio signal representation; and
`a module adapted to produce said generated audio output,
`wherein each user has their audioheadphone configured
`to communicate with their own separate audio transmit
`ter, and said audio virtually free from interference from
`transmission and reception device signals operating in a
`shared wireless headphone spectrum.
`3. A wireless digital audio headphone comprising:
`a digital audio headphone receiver configured to receive an
`unique user codebit 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 coded wireless spread spec
`trum communication with a mobile digital audio trans
`mitter, and said user has their headphone configured to
`communicate with their own 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 origi
`nal audio signal representation said packets embed
`ded in the received spread spectrum signal, the cap
`tured packets corresponding to the unique user code:
`a digital demodulator configured for independent
`CDMA communication operation wherein a user has
`their own transmitter and receiver;
`a decoder operative to decode the 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 responsive to the unique user code bit
`sequence to produce said generated audio output
`wherein each user has their audio headphone config
`ured to communicate with their own separate audio
`transmitter, said output virtually free from interfer
`ence from transmission and reception device signals
`operating in the shared wireless headphone spectrum.
`4. The wireless digital audio headphone of claim 3,
`wherein the audio output is music.
`5. A mobile wireless digital audio receiver, configured to
`receive a unique user code and an original audio signal rep
`resentation in the form of packets, said unique user code used
`to spread the spectrum of said signal and further configured
`
`40
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`
`6
`for independent CDMA communication operation, said
`receiver independent of the operation of another receiver, said
`mobile wireless digital 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 original audio
`signal representation respective to said mobile digital
`audio receiver, said packets embedded in the received
`spread spectrum signal, the captured packets corre
`sponding to the unique user code;
`a decoder operative to decode the reduced intersymbol
`interference coding of said original audio signal repre
`sentation;
`a digital-to-analog converter generating an audio output of
`said original audio signal representation; and
`a module adapted to produce said generated audio output,
`wherein each user has their audio receiver configured to
`communicate with their own separate audio transmitter,
`and said audio virtually free from interference from
`transmission and reception device signals operating in
`the shared spectrum.
`6. A mobile wireless digital audio receiver, configured to
`receive a unique user code and an original audio signal rep
`resentation in the form of packets, said unique user code used
`to spread the spectrum of said signal and further configured
`for independent CDMA communication operation, said
`receiver independent of the operation of another receiver, 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 signal
`representation, said packets embedded in the received
`spread spectrum signal, the captured packets corre
`sponding 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 produce said generated audio output,
`wherein each user has their audio receiver configured to
`communicate with their own separate audio transmitter,
`and said audio virtually free from interference from
`transmission and reception device signals operating in a
`shared spectrum.
`7. A wireless digital audio receiver, configured to receive
`an unique user code and a original audio signal representa
`tion, said unique user code used to spread a spectrum of said
`signal and further configured for independent CDMA com
`munication operation, said receiver independent of the opera
`tion of another receiver, said wireless digital audio receiver
`comprising:
`fuzzy set membership functionality to enhance detection of
`said unique user code:
`a direct conversion module configured to capture the cor
`rect bit sequence embedded in the received spread spec
`trum signal;
`a module adapted to produce said original audio signal
`representation, wherein each user has their audio
`receiver configured to communicate with their own
`separate audio transmitter, and said audio virtually free
`from interference from transmission and reception
`device signals.
`
`10
`
`15
`
`25
`
`30
`
`35
`
`50
`
`55
`
`60
`
`65
`
`ONE-E-WAY 2003
`Apple v. One-E-Way
`IPR2021-00283
`
`008
`
`

`

`US 9,107,000 B2
`
`5
`
`10
`
`15
`
`25
`
`7
`8. A wireless digital coded music audio spread spectrum
`transmitter operatively coupled to a music audio source and
`configured to transmit a unique user code and an original
`audio signal representation in the form of packets, wherein
`said digital coded music audio transmitter coupled to said
`music audio source, and configured to be directly communi
`cable with a mobile digital audio spread spectrum receiver, is
`capable of being moved in any direction during operation,
`said wireless digital coded audio transmitter comprising:
`encoding operative to encode said original audio signal
`representation to reduce intersymbol interference and
`aid in lowering signal detection error of said audio rep
`resentation signal respective to said receiver and mobile
`said transmitter coupled to said music audio source:
`a digital modulator module configured for independent
`code division multiple access communication operation,
`wherein each user has their own separate transmitter
`configured to communicate with their receiver, said
`transmitter configured to wirelessly transmit said audio
`to be reproduced virtually free from interference from
`transmission and reception device signals operating in
`the wireless digital audio transmitter shared spectrum.
`9. A mobile wireless digital audio receiver capable of being
`moved in any direction during operation and configured to
`receive a unique user code and an original audio signal rep
`resentation in the form of packets, said unique user code used
`to spread a spectrum of said signal and further configured for
`independent CDMA communication operation, said receiver
`independent of the operation of another receiver, said wire
`less digital audio receiver comprising:
`a spread spectrum receiver module configured to capture
`packets and a correct bit sequence within the packets
`aided by lowering signal detection error through
`reduced intersymbol interference coding of said original
`audio signal representation, said packets embedded in
`the received spread spectrum signal, the captured pack
`ets corresponding to the unique user code:
`
`30
`
`35
`
`8
`a decoder operative to decode the reduced intersymbol
`interference coding of said original audio signal repre
`sentation, wherein each user has their audio receiver
`configured to communicate with their own separate
`audio transmitter, and said audio virtually free from
`interference from transmission and reception device sig
`nals operating in the shared spectrum.
`10. A wireless digital coded audio spread spectrum trans
`mitter operatively coupled to a audio source and configured to
`transmit a unique user code and an original audio signal
`representation in the form of packets, wherein said digital
`coded audio transmitter coupled to said audio source, and
`configured to be directly communicable with a mobile digital
`audio spread spectrum receiver, is capable of being moved in
`any direction during operation, said wireless digital coded
`audio transmitter comprising:
`an encoding module operative to encode said original
`audio signal representation to reduce intersymbol inter
`ference and aid in lowering signal detection error of said
`audio signal representation, said transmitter coupled to
`said audio source:
`a digital modulator module configured for independent
`code division multiple access communication operation,
`each user has their own separate transmitter configured
`to communicate with their receiver, said transmitter con
`figured to wirelessly transmit said audio to be repro
`duced virtually free from interference from transmission
`and reception device signals operating in the wireless
`digital audio transmitter shared spectrum.
`11. The wireless digital audio receiver of claim 8, wherein
`the spread spectrum receiver module is further configured to
`utilize differential phase shift keying (DPSK) to demodulate
`said audio signal representation.
`12. The wireless digital audio receiver of claim 10, wherein
`the spread spectrum receiver module is further configured to
`utilize differential phase shift keying (DPSK) to demodulate
`said audio signal representation.
`
`ONE-E-WAY 2003
`Apple v. One-E-Way
`IPR2021-00283
`
`009
`
`