(12) United States Patent
`Woolfork
`
`(10) Patent N0.:
`
`(45) Date of Patent:
`
`US 9,282,396 B2
`*Mar. 8, 2016
`
`US009282396B2
`
`WIRELESS DIGITAL AUDIO MUSIC SYSTEM
`
`Applicant: C. Earl Woolfork, Pasadena, CA (US)
`
`Inventor: C. Earl Woolfork, Pasadena, CA (US)
`
`Assignee: One-E-Way Inc., Pasadena
`
`Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(0) by 205 days.
`
`This patent is subject to a terminal dis-
`claimer.
`
`13/775,754
`
`Feb. 25, 2013
`
`Prior Publication Data
`
`US 2014/0241543 A1
`
`Aug. 28, 2014
`
`Related U.S. Application Data
`
`Continuation of application No. 13/356,949, filed on
`Jan. 24, 2012, now Pat. No. 9,107,000, which is a
`continuation of application No. 12/940,747, filed on
`Nov. 5, 2010, now Pat. No. 8,131,391, which is a
`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.
`
`Int. Cl.
`G06F 17/00
`H04R 1/10
`H04R 5/033
`H04M 1/60
`H041} 1/7097
`H04H 20/61
`
`(2006.01)
`(2006.01)
`(2006.01)
`(2006.01)
`(2011.01)
`(2008.01)
`
`.A!21L‘l1l1:1
`
`(52) U.S. Cl.
`CPC .......... .. H04R 1/1083 (2013.01); H04B 1/7097
`(2013.01); H04H20/61 (2013.01); H04M
`1/6066 (2013.01); H04R 5/033 (2013.01);
`H04R 2420/07 (2013.01)
`Field of Classification Search
`
`CPC .... .. H04R 2420/07; H04R 5/04; H04R 5/033;
`H04B 1/086; H04B 5/06; H04M 1/6041;
`H04M 1/6066
`
`See application file for complete search history.
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`
`5,175,558
`5.491.839
`5.771.441
`5,781,542
`5.946.343
`6,130,643
`6,317,039
`6,418,558
`
`12/1992 DuPree ....................... .. 342/378
`2/1996 Schotz . . .
`. .
`. . . . .. 455/39
`6/1998 Altstatt
`455/66.1
`7/1998 "anakaet al.
`370/342
`8/1999
`375/141
`10/2000 '
`342/380
`11/2001 '
`.. 340/505
`7/2002
`
`(Conti
`
`Primary Examiner — Andrew C Flanders
`(74) Attorney, Agem, or Firm — Megan Lyman
`
`(57)
`
`ABSTRACT
`
`A wireless digital audio system includes a portable audio
`source with a digital audio transmitter operatively coupled
`thereto and an audio receiver operatively coupled to a 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.
`
`17 Claims, 3 Drawing Sheets
`
`SONY Exhibit 1001 - 0001
`
`

`
`US 9,282,396 B2
`Page 2
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`
`6,424,820 B1 *
`6,456.645 Bl*
`6,678,892 131*
`6,781,977 131*
`
`7/2002 Burdick et al.
`9/2002 Kurrat ........ ..
`1/2004 Levelle e1a1.
`8/2004 L1
`.............................. [0 370/335
`
`............ ..
`..
`
`5/2005 Benson et a1.
`6.898.585 B2 *
`.
`1/2006 Goldner etal.
`6.982.132 B1*
`5/2006 Rhee et a1.
`.... ..
`7.047.474 B2 *
`8/2006 Chuang et al.
`..
`7.099.413 B2 *
`9/2001 Eidson et al.
`2001/0025358 Al*
`2004/0223622 Al* 11/2004
`
`*cited by examiner
`
`SONY Exhibit 1001 - 0002
`
`

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`U.S. Patent
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`.I._aM
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`6102
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`Sheet 1 of 3
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`US 9,282,396 B2
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`SONY Exhibit 1001 - 0003
`
`

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`U.S. Patent
`
`.I._aM
`
`610200.,
`
`Sheet 2 of 3
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`US 9,282,396 B2
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`SONY Exhibit 1001 - 0004
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`

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`U.S. Patent
`
`Mar. 8, 2016
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`Sheet 3 of 3
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`US 9,282,396 B2
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`M.«.2..N.
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`W.M
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`mmmfi
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`SONY Exhibit 1001 - 0005
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`

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`US 9,282,396 B2
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`2
`ter may include a headphone plug in conununication 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(cid:173)
`ventional cable connections.
`These and other features, aspects and advantages of the
`present invention will become better understood with refer(cid:173)
`ence to the following drawings, description and claims.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`1
`WIRELESS DIGITAL AUDIO MUSIC SYSTEM
`
`This continuation application claims the benefit of U.S.
`patent application Ser. No. 13/356,949 filed Jan. 24, 2012,
`which was a continuation application claiming the benefit of
`U.S. patent application Ser. No. 12/940,747 filed Nov. 5,
`2010, now U.S. Pat. No.8, 131,391, which was a continuation
`application claiming the benefit of U.S. patent application
`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 10
`U.S. patent application Ser. No. 121144,729 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 15
`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(cid:173)
`sures of which are incorporated herein in their entireties by
`reference.
`
`BACKGROUND OF THE INVENTION
`
`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
`20 system in accordance with the present invention;
`FIG. 2 is a block diagram of an audio transmitter portion of
`the wireless digital audio system ofFIG. 1;
`FIG. 3 is a blockdiagramofanaudioreceiverportionofthe
`wireless digital audio system ofFIG.l; 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.
`
`This invention relates to audio player devices and more
`particularly to systems that include headphone listening 25
`devices. The new audio system uses an existing headphone
`jack (i.e., tins is the standard analog headphone jack that
`counects 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, 30
`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./ 35
`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 headphone jack
`to winch headphones may be com1ected by wire.
`There are also known wireless headphones that may 40
`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 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- 45
`less transmission and reception by headphones of audio
`music for private listening without interference where mul(cid:173)
`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 50
`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(cid:173)
`viously mentioned music devices), to allow coded digital
`wireless transmission (using a battery powered transmitter) to 55
`a headphone receiver (using a battery powered receiver head(cid:173)
`phones) that accomplishes private listening to multiple users
`occupying the same space without the use of wires.
`
`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 cmmected to the music audio source 80 analog
`headphone jack 82 using a headphone plug 22. The battery
`powered transmitter 20 may have a transmitting antem1a 24
`that may be onmi-directional for transmitting a spread spec(cid:173)
`tmm 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 spectmm 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(cid:173)
`version, the digital signal may be processed by a digital low
`pass filter. To reduce the effects of charmel noise, the battery
`powered transmitter 20 may use a chmmel encoder 38. A
`modulator 42 modulates the digital signal to be transmitted.
`For further noise inununity, a spread spectmm DPSK (differ-
`60 entia! phase shift key) transmitter or module 48, is utilized.
`The battery powered transmitter 20 may contain a code gen(cid:173)
`erator 44 that may be used to create a unique user code. The
`mnque user code generated is specifically associated with one
`wireless digital audio system user, and it is the only code
`65 recognized by the battery powered headphone receiver 50
`operated by a particular user. The radio frequency (RF) spec(cid:173)
`tmm utilized (as taken from the Industrial, Scientific and
`
`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 teclmology may be utilized by the system
`to enhance bit detection. A battery-powered digital transmit-
`
`SONY Exhibit 1001 - 0006
`
`

`
`US 9,282,396 B2
`
`3
`Medical (ISM) band) may be approximately 2.4 GHz. The
`power radiated by the transmitter adheres to the ISM stan(cid:173)
`dard.
`Particularly, the received spread spectmm signal may be
`communicated to a 2.4 GHz direct conversion receiver or
`module 56. Referring to FIGS. 1 through 4, the spread spec(cid:173)
`tmm modulated signal from transmit antenna 24 may be
`received by receiving antenna 52 and then processed by
`spread spectmm direct conversion receiver or module 56 with
`a receiver code generator 60 that contains the same transmit(cid:173)
`ted tmique code, in the battery powered receiver 50 head(cid:173)
`phones. The transmitted signal from antenna 24 may be
`received by receiving antelllla 52 and communicated to a
`wideband bandpass filter (BPF). The battery powered
`receiver 50 may utilize embedded fuzzy logic 61 (as graphi(cid:173)
`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(cid:173)
`tems 10 may appear as noise to audio receiver 50. This may 25
`also be true for other device transmitted wireless signals
`operating in the wireless digital audio spectmm of digital
`audio system10. This code division multiple access (CDMA)
`may be used to provide each user independent audible enjoy(cid:173)
`ment. The resulting summed digital signal from receiving
`sUlllll1ary element 58 and direct conversion receiver or mod(cid:173)
`ule 56 may be processed by a 64-Ary demodulator 62 to
`demodulate the signal elements modulated in the audio trans(cid:173)
`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 chmmel 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 m1y of the audio
`devices listed previously, without the use of wires, and with(cid:173)
`out interference from any other receiver headphone 50 user,
`even when operated within a shared space. The fuzzy logic
`detection teclmique 61 used in the receiver 50 could provide 45
`greater user separation through optimizing code division in
`the headphone receiver.
`The battery powered trm1smitter 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 55
`received, the fuzzy logic detection sub-system 61 may com(cid:173)
`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 an1biguity of the
`high (1 )/low (0 or -1) event in the received user code within 60
`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 mles to map the user code bit inputs 65
`to validation outputs. These mles may be developed as if-then
`statements.
`
`4
`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' mles
`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
`1 o code bit energy may have some membership to a low and high
`as represented in FIG. 4. The if-part fuzzy set may detennine
`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
`15 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 mle parts that make up the fhzzy logic detection
`sub-system 61must be followed by a defuzzifying operation.
`20 This operation reduces the aforementioned fuzzy set to a bit
`energy representation (i.e., -1 or 1) that is received by the
`trm1smitted packet. Fuzzy logic detection sub-system 61may
`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 mwlog or base band fonnat for use in powering
`speaker(s) 75.Adigital-to-analog converter 70 (DAC) may be
`used to transform the digital signal to m1 analog audio signal.
`An analog low pass filter 72 may be used to filter the analog
`30 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 7 4 that may be optimized for powering headphone
`speakers 75 to provide a high quality, low distortion audio
`35 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(cid:173)
`tive of the general principles of the present invention. Other
`modifications or variations may be employed that are within
`40 the scope of the invention. Thus, by way of exillllple, but not
`of limitation, alternative configurations may be utilized in
`accordance with the teachings herein. Accordingly, the draw(cid:173)
`ings and description are illustrative and not meant to be a
`limitation thereof.
`Moreover, all terms should be interpreted in the broadest
`possible mmmer consistent with the context. In particular, the
`tern1s "comprises" and "comprising" should be interpreted as
`referring to elements, components, or steps in a non-exclusive
`mallller, indicating that the referenced elements, components,
`so or steps may be present, or utilized, or combined with other
`elements, components, or steps that are not expressly refer(cid:173)
`enced. Thus, it is intended that the invention cover all embodi(cid:173)
`ments and variations thereof as long as such embodiments
`and variations come within the scope of the appended claims
`and their equivalents.
`The invention claimed is:
`1. A portable wireless digital audio system for digital trans(cid:173)
`mission of an original audio signal representation from a
`portable audio source to a digital audio headphone, said audio
`signal representation representative of audio from said por(cid:173)
`table audio source. said portable wireless digital audio system
`comprising:
`a portable digital audio spread spectmm transmitter con(cid:173)
`figured to couple to said portable audio source m1d trans(cid:173)
`mitting a tmique user code bit sequence with said origi(cid:173)
`nal audio signal representation in packet format, said
`digital audio spread spectmm transmitter comprising:
`
`SONY Exhibit 1001 - 0007
`
`

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`US 9,282,396 B2
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`5
`an encoder operative to encode said original audio signal
`representation to reduce intersymbol interference and
`lowering signal detection error of said audio signal rep(cid:173)
`resentation respective to said digital audio headphone
`and said digital audio spread spectrum transmitter; and
`a digital modulator configured for independent code divi(cid:173)
`sionmultiple access (CDMA) co111111unication operation
`wherein said portable digital audio spread spectnun
`transmitter is in direct communication with said digital
`audio headphone, said digital audio headphone compris- 1 o
`ing:
`a direct conversion module configured to capture packets
`and the correct bit sequence embedded in the received
`spread spectrum signal and lowering signal detection
`error through reduced intersymbol interference coding 15
`respective of said digital audio headphone and said por(cid:173)
`table digital audio spread spectmm transmitter, the cap(cid:173)
`tured packets corresponding to the unique user code bit
`sequence;
`a digital demodulator configured for independent CDMA
`co111111unication 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 audio output, wherein
`each user has their headphone configured to conununi(cid:173)
`cate with their own separate digital audio spread spec(cid:173)
`tnun transmitter, said audio having been wirelessly 30
`transmitted from said portable audio source through the
`digital audio spread spectmm transmitter configured to
`co111111tmicate with the headphone such that signals not
`originating from said portable digital audio spread spec(cid:173)
`tnun transmitter are inaudible while operating in the 35
`portable wireless digital audio spread spectrum trans(cid:173)
`mitter spectmm.
`2. A wireless digital audio headphone comprising:
`a portable digital audio headphone spread spectmm
`receiver configured to receive a unique user code bit 40
`sequence and an audio signal representation in the form
`of packets, said audio signal representation representa(cid:173)
`tive of audio from a portable audio player coupled to a
`mobile digital audio spread spectmm transmitter, said
`digital audio headphone spread spectrum receiver 45
`capable of mobile operation and in direct conununica(cid:173)
`tion with the mobile digital audio spread spectrum trans(cid:173)
`mitter;
`a direct conversion module configured to capture packets
`and the correct bit sequence within the packets and low- 50
`ering signal detection error through reduced intersymbol
`interference coding of said audio signal representation
`respective to said headphone spread spectmm receiver
`and said mobile digital audio spread spectrum transmit(cid:173)
`ter, said packets embedded in the received spread spec- 55
`trum signal, the captured packets corresponding to the
`unique user code;
`a digital demodulator configured for independent CDMA
`colllllltmication operation;
`a decoder operative to decode reduced intersymbol inter- 60
`ference coding of said audio signal representation;
`a digital-to-analog converter (DAC) generating an audio
`output of said audio signal representation; and
`a module adapted to reproduce said audio output in
`response to the tmique user code bit sequence being 65
`recognized, wherein each user has their spread spectrum
`headphone receiver configured to communicate with
`
`6
`their own separate spread spectnun transmitter, said
`audio having been wirelessly transmitted and repro(cid:173)
`duced such that signals not originating from the mobile
`digital audio spread spectrum transmitter, configured to
`co111111unicate with the headphone receiver, are inaudible
`while operating in the mobile wireless digital audio
`spread spectrum transmitter spectrum.
`3. The portable wireless digital audio system of claiml,
`wherein said portable digital audio spread spectrum transmit(cid:173)
`ter comprising a differential phase shift keying (DPSK)
`implementation and a digital modulator implementation for
`spread spectrum transmission.
`4. The portable wireless digital audio system of claim 1,
`wherein said digital audio headphone comprising a differen(cid:173)
`tial phase shift keying (DPSK) implementation and a digital
`demodulator implementation for spread spectmm reception.
`5. The wireless digital audio headphone of claim 2,
`wherein said portable digital audio headphone spread spec(cid:173)
`tmm receiver comprising a differential phase shift keying
`20 (DPSK) implementation and a digital demodulator imple(cid:173)
`mentation for spread spectmm reception.
`6. A portable wireless digital audio system for digital trans(cid:173)
`mission of an audio signal representation from a portable
`audio player to a portable digital audio headphone spread
`25 spectmm receiver, said audio signal representation represen(cid:173)
`tative of audio from said portable audio player, said portable
`wireless digital audio system comprising:
`a digital audio spread spectnun transmitter operatively
`coupled to said portable audio player and transmitting a
`unique user code bit sequence with said audio signal
`representation in packet format, wherein said digital
`audio spread spectmm transmitter operatively coupled
`to said audio player is capable of mobile operation, said
`digital audio spread spectrum transmitter comprising:
`an encoder operative to encode said audio signal repre(cid:173)
`sentation to reduce intersymbol interference and low-
`ering signal detection error of said audio signal rep(cid:173)
`resentation respective to headphone spread spectmm
`receiver and mobile digital audio spread spectmm
`transmitter; and
`a digital modulator configured for independent CDMA
`comnnmication operation wherein the digital audio
`spread spectmm transmitter is directly connnunicable
`with said portable digital audio headphone spread
`spectnun receiver, said portable digital audio head(cid:173)
`phone spread spectmm receiver comprising;
`a direct conversion module configured to capture pack-
`ets and the correct bit sequence within the packets and
`lowering signal detection error through reduced
`intersymbol interference coding of said audio repre(cid:173)
`sentation signal respective to said headphone and
`mobile said digital audio spread spectnun transmitter
`operatively coupled to said audio player, 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 colllllltmication operation;
`a decoder operative to decode the applied reduced
`intersymbol interference coding of said audio signal
`representation;
`a digital-to-analog converter (DAC) generating an audio
`output of said audio signal representation; and
`a module adapted to reproduce said generated audio out(cid:173)
`put, wherein each user has their headphone configured to
`conununicate with their own separate spread spectmm
`transmitter, said audio having been wirelessly transmit-
`
`SONY Exhibit 1001 - 0008
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`

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`US 9,282,396 B2
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`7
`ted from said portable audio player and reproduced such
`that signals not originating from the mobile digital audio
`spread spectrum transmitter, configured to conununi(cid:173)
`cate with the headphone, are inaudible while operating
`in the mobile wireless digital audio spread spectrum
`transmitter spectrum.
`7. The portable wireless digital audio system of claim 6,
`wherein said digital audio spread spectrum transmitter com(cid:173)
`prising a differential phase shift keying (DPSK) implemen(cid:173)
`tation and a digital modulator implementation for spread 10
`spectrum transmission.
`8. The portable wireless digital audio system of claim 6,
`wherein said portable digital audio headphone spread spec(cid:173)
`trum receiver comprising a differential phase shift keying
`(DPSK) implementation and a digital demodulator imple- 15
`mentation for spread spectrum reception.
`9. A portable wireless digital audio system for digital trans(cid:173)
`mission of an audio signal representation from a portable
`audio player to a portable digital audio spread spectnun
`receiver, said audio signal representation representative of 20
`audio from said portable audio player, said portable wireless
`digital audio system comprising;
`a digital audio spread spectrum transmitter operatively
`coupled to said portable audio player and transmitting a
`unique user code with said audio sigual representation in 25
`packet format, wherein said digital audio spread spec(cid:173)
`tnun transmitter operatively coupled to said audio player
`is capable of mobile operation, said digital audio spread
`spectrum transmitter comprising;
`an encoder operative to encode said audio signal repre- 30
`sentation to reduce intersymbol interference and low(cid:173)
`ering signal detection error of said audio signal rep(cid:173)
`resentation respective to mobile spread spectnun
`receiver and mobile digital audio spread spectrum
`transmitter;
`a digital modulator configured for independent CDMA
`communication operation and a differential phase
`shift keying (DPSK) modulator to modulate said
`audio signal representation wherein the digital audio
`spread spectrum receiver is capable of mobile opera- 40
`tion and in direct connnunication with said mobile
`digital audio spread spectrum transmitter, said mobile
`digital audio spread spectnun receiver comprising;
`a direct conversion module configured to capture pack-
`ets and the correct bit sequence within the packets and 45
`lowering signal detection error through reduced
`intersymbol interference coding of said audio repre(cid:173)
`sentation signal respective to said mobile digital
`audio spread spectnun receiver and said mobile digi-
`tal audio transmitter operatively coupled to said audio 50
`player, 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 connnunication operation;
`a decoder operative to decode the applied reduced
`intersymbol interference coding of said audio signal
`representation;
`a digital-to-analog converter (DAC) generating an audio
`output of said audio signal representation;
`and a module adapted to reproduce said generated audio
`output, wherein each user has their spread spectrum
`receiver configured to connnunicate with their own
`separate spread spectrum transmitter, said audio hav(cid:173)
`ing been wirelessly transmitted from said portable
`audio player and reproduced such that siguals not
`originating from the mobile digital audio spread spec-
`
`8
`trum transmitter, configured to connntmicate with the
`spread spectrm11 receiver, are inaudible while operat(cid:173)
`ing in the mobile wireless digital audio spread spec(cid:173)
`trum transmitter spectrum.
`10. The portable wireless digital audio system of claim 9,
`wherein the digital modulator implementation is communi(cid:173)
`cable with a differential phase shift keying (DPSK) imple(cid:173)
`mentation and wherein said DPSK modulates said audio sig-
`nal representation.
`11. The portable wireless digital audio system of claim 9,
`wherein the digital demodulator implementation is connnu(cid:173)
`nicable with a differential phase shift keying (DPSK) imple(cid:173)
`mentation and wherein said DPSK demodulates said audio
`signal representation.
`12. The portable wireless digital audio system of claim 9,
`wherein said digital audio spread spectrum transmitter com(cid:173)
`prising a differential phase shift keying (DPSK) implemen(cid:173)
`tation and a digital modulator implementation for spread
`spectrum transmission.
`13. The portable wireless digital audio system of claim 9.
`wherein said portable digital audio spread spectnun receiver
`comprising a differential phase shift keying (DPSK) imple(cid:173)
`mentation and a digital demodulator implementation for
`spread spectrum reception.
`14. A wireless digital audio spread spectnun receiver,
`capable of mobile operation, configured to receive a unique
`user code and a audio signal representation from a mobile
`digital audio spread spectrum transmitter in the form of pack(cid:173)
`ets, said audio signal representation representative of audio
`from a portable audio source, said digital audio spread spec(cid:173)
`trum receiver directly communicable with said mobile digital
`audio transmitter, said digital audio spread spectrum receiver
`comprising;
`a direct conversion module configured to capture packets
`and the correct bit sequence within the packets and low(cid:173)
`ering signal detection error through reduced intersymbol
`interference coding of said audio representation sigual
`respective to mobile said digital audio spread spectrum
`receiver and said mobile digital audio spread spectrum
`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(cid:173)
`ference coding of said 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(cid:173)
`put, wherein each user has their spread spectrum
`receiver configured to communicate with their own
`separate spread spectnun transmitter, said audio having
`been wirelessly transmitted from said portable audio
`source such that signals not originating from said mobile
`digital audio spread spectrum transmitter, configured to
`communicate with the spread spectrum receive