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`Unexamined Utility Model 2000-0006888
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`(19) Korean Intellectual Property Office (KR)
`(12) Official Gazette of Unexamined Utility Models (U)
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`(51). Int. Cl.6
`(11) Publication Number:
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`(43) Publication Date:
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`H04R 3/00
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`_________________________________________________________________________________________________________
`(21) Application Number
`20-1998-0018161
`(22) Application Date
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`September 23, 1998
`_________________________________________________________________________________________________________
`(71) Applicant
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`Doshin Co., Ltd. Duk Ha Lee
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`Ham Inhwa, 641-11 Deungchon-dong, Gangseo-gu, Seoul
`#3, 632 Deungchon-dong, Gangseo-gu, Seoul
`In Hwa Kim
`632-3, Deungchon-dong, Gangseo-gu, Seoul
`Gun Yung An
`632-3, Deungchon-dong, Gangseo-gu, Seoul
`Suk Heum Gweon, Yung Pil Lee, Sang Yong Lee
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`2000-0006888
`April 25, 2000
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`(74) Agent(s)
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`Examination Requested: Requested
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`(54) Code division type transmission circuit and wireless headphone reception circuit
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`Abstract
`The present design relates to a code division type transmission circuit and a wireless headphone reception circuit for transmitting and
`receiving signals in a code division method. The present design comprises a codec unit 7 for encoding a signal applied from a signal
`source 8; a central control modem unit 6 for performing error correction by receiving the output of the codec unit 7 as an input and
`spreading a signal band; and a base band unit 5 that receives the output of the central control modem unit 6 as an input, converts it
`into an intermediate frequency and outputs the converted signal; wherein a signal output from the base band unit 5 is amplified and
`filtered, and a gain of the signal is controlled and transmitted to an antenna A. Further, in a wireless headphone receiving circuit for
`amplifying and filtering a signal wirelessly applied through an antenna A and controlling a gain to output an audio signal to an output
`unit 9, the wireless headphone receiving circuit of the code division method comprises a base band unit 5 for processing the gain-
`controlled signal as an input and processing it at an intermediate frequency; a central control modem unit 6 for removing an error
`correction and a pseudorandom code by receiving the output of the base band unit 5 as an input; a codec unit 7 for decoding an audio
`signal by receiving the output of the central control modem unit 6 as an input; and an amplifier unit 1c that amplifies the signal output
`from the codec unit 7 as an input and outputs the amplified audio signal to the output unit 9.
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`Representative Drawing
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`FIG. 1
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`Specification
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`Brief Description of the Drawings
`FIG. 1 is a block diagram of a transmission circuit of a code division method according to the present design.
`FIG. 2 is a block diagram of a wireless headphone receiving circuit of a code division method according to the present design.
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`<Explanation of symbols for major parts of drawings>
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`1a: First amplifier unit
`1c: Third amplifier unit
`2b: Second filter unit
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`4: Gain control unit
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`6: Central control modem unit
`8: Signal source
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`Detailed Description of the Design
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`(72) Designer(s)
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`1b: Second amplifier unit
`2a: First filter unit
`3: Converter unit
`5: Base band unit
`7: Codec unit
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`Purpose of the Design
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`5-1
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`Petitioner's Exhibit 1010
`Page 001
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`Unexamined Utility Model 2000-0006888
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`Technical Field of the Design and Prior Art
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`The present design relates to a wireless head phone transmission and reception circuit; in particular the present design relates to a code division
`type transmission circuit and wireless headphone reception circuit that transmit and receive signals using the Code Division Multiple Access
`(CDMA) method.
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`In general, a headphone is a design used to provide audio only to a user who uses the headphone by receiving an audio signal wirelessly or
`wired; in addition, the code division multiple access method (hereinafter referred to as the code division method) is a method of sharing a
`frequency by extending a signal into a frequency band that is much wider than the bandwidth of the required amount of information. In other
`words, it shares all frequency and time and maintains orthogonality with a unique code assigned to it. In this case, in the code division method,
`a signal to be transmitted is extended by receiving a unique Pseudo Random (PN) code.
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`Headphones according to the prior art are connected by wire or wirelessly to an amplifier of an audio device, and receive an audio signal
`provided from the amplifier of the audio device and provide the audio signal to a user.
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`However, since the headphones according to the prior art have an analog FM modulation method or an infrared method, the sound quality of
`the audio signal output from the headphones is reduced due to interference or collision with surrounding frequencies within a certain frequency
`band, so that there is a problem in that it is difficult to implement a high quality audio signal due to a fading phenomenon.
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`Technical Problem to be Solved by the Design
`The object of the present design is, in receiving audio signals wirelessly and playing the same with high quality sound, to provide a wireless
`headphone receiving circuit of a code division method that has a channel separation of 90 dB or more and a distortion ratio of 0.01% or more,
`which is equivalent to that of a compact disk, and a data transmission rate of 1.5 Mbps, to overcome the noise and interference of analog
`wireless headphones.
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`Another object of the present design is to apply a spread spectrum modulation method, which is a CDMA method, wherein in PCS, which is a
`personal mobile phone, the transmission rate is 14.4 kbps, and the frequency band is set from 902 MHz to 928 MHz.
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`Configuration and Operation of the Design
`To achieve the above object, the transmission circuit of the code division method according to the present design comprises, in a transmission
`circuit for wirelessly transmitting a signal through an antenna A, a codec unit 7 for encoding a signal applied from a signal source 8; a central
`control modem unit 6 for performing error correction by receiving the output of the codec unit 7 as an input and spreading a signal band; and
`a base band unit 5 that receives the output of the central control modem unit 6 as an input, converts the output into an intermediate frequency
`and outputs the converted signal; wherein a signal output from the base band unit 5 is amplified and filtered, and a gain of the signal is controlled
`and transmitted to an antenna A.
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`To achieve the above object, the wireless headphone receiving circuit of the code division method of the present design comprises, in a wireless
`headphone receiving circuit for amplifying and filtering a signal wirelessly applied through an antenna A and controlling a gain to output an
`audio signal to an output unit 9, a base band unit 5 for processing the gain-controlled signal as an input and processing it at an intermediate
`frequency; a central control modem unit 6 for removing an error correction and a pseudorandom code by receiving the output of the base band
`unit 5 as an input; a codec unit 7 for decoding an audio signal by receiving the output of the central control modem unit 6 as an input; and an
`amplifier unit 1c that amplifies the signal output from the codec unit 7 as an input and outputs the amplified audio signal to the output unit 9.
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`Hereinafter, the operation of the transmission circuit of the code division method according to the present design configured as described above
`will be described.
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`FIG. 1 is a block diagram showing a transmission circuit of a code division method according to the present design. As shown, the
`transmission circuit of the code division method according to the present design comprises a signal source 8, a codec 7, a central control modem
`6, a base band 5, a gain control unit (Automatic Gain Control: AGC) 4, a converter 3, first and second filter units 2a and 2b, first and second
`amplifier units 1a and 1b, and antenna A.
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`In the transmission circuit of the code division method according to the present design configured as described above, an analog or digital
`audio signal of stereo (L, R; Left, Right) applied from the signal source 8, which is an audio device, is applied to the codec unit 7.
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`The codec unit 7 encodes the applied audio signal, converts the encoded signal into a digital signal, and applies it to the central control modem
`unit 6.
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`The central control modem unit 6 performs error correction encoding on the applied signal and performs immunity processing so as not to be
`affected by noise generated in the communication channel, spreads a high-speed pseudorandom code with a wide band in order to maintain the
`modulated signal using the DBPSK or DQPSK method with high fidelity sound quality; each extended signal is then encrypted (scrambled),
`and I and Q signals separated between channels are generated.
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`In addition, the I and Q basis data, which are two digital signals of the generated I and Q signals, enter the I digital/analog converter (DAC),
`which is not shown at the rising edge where the transmit clock is raised, and it is noted for reference that the Q digital/analog converter (DAC),
`which is not shown, is applied at the falling edge.
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`The I and Q signals are applied to the base band unit 5 for transmission. The base band unit 5 converts the applied signal into an intermediate
`frequency (IF). For the signal converted to the intermediate frequency, the gain of the signal is controlled by the gain controller 4. Using the
`code division multiple access method in this manner, accordingly, a signal modulated with an intermediate frequency (IF) carrying code division
`multiple access data is applied to the gain control unit 4 and the gain thereof is automatically controlled.
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`5-2
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`Petitioner's Exhibit 1010
`Page 002
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`Unexamined Utility Model 2000-0006888
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`The signal output by controlling the gain in the gain control unit 4 is applied to the input terminal of the converter unit 3; the signal applied to the
`converter unit 3 is a mixture of a local oscillation signal and an intermediate frequency signal to generate a sum and difference signal of the two signals,
`and the sum signal is applied to the second filter unit 2b as a transmission frequency. The signal applied to the second filter unit 2b to remove noise
`and passing through only a certain transmission frequency band is amplified through the second amplifier unit 1b and the first filter unit 2a, and noise is
`removed again so that the signal that has passed through the first amplifier unit 1a and the first filter unit 2a, which are power amplifiers, is amplified,
`the noise is removed, and the signal is transmitted through the antenna A.
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`FIG. 2 is a block diagram showing a wireless headphone receiving circuit of a code division method according to the present design.
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`The wireless headphone receiving circuit of the code division method according to the present design comprises an antenna A, first and second filter
`units 2a and 2b, first and second amplifier units 1a and 1b, a converter unit 3, a gain control unit 4, a base band unit 5, a central control modem unit 6, a
`codec unit 7, a third amplifier unit 1c, and an output unit 9.
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`The output unit 9 is preferably a speaker equipped in the wireless headphones.
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`Hereinafter, the operation of the wireless headphone receiving circuit of the code division method according to the present design configured as above
`will be described.
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`With the signal transmitted through the antenna A shown in FIG. 1, a stereo analog audio signal or a digital audio signal is wirelessly applied through the
`antenna A shown in FIG. 2. The signal that is applied wirelessly is processed in the reverse order of signal processing in the transmission circuit shown
`in FIG. 1.
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`In other words, the insignificant audio signal applied to the antenna A of the headphones is amplified by the first amplifier unit (1a), which is a power
`amplifier, is then amplified through the first filter unit 2a, the second amplifier unit 1b, and the second filter unit 2b, and noise is removed and the signal
`is applied to the converter unit 3.
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`The frequency of the signal applied to the converter unit 3 is converted, and the gain of the signal is controlled through the gain control unit 4, which is
`an automatic gain control unit.
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`As described above, the gain-controlled signal is processed to an intermediate frequency through the base band unit 5 and applied to the central control
`modem unit 6. The central control modem unit 6 removes the carrier pseudorandom code from the applied signal. The signal from which the noise code
`is removed from the central control modem unit 6 is applied to the codec unit 7. The codec unit 7 decodes the applied signal to decode the encoded signal,
`and outputs the decoded signal to the third amplifier unit 1c.
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`The audio signal input to the third amplifier unit 1c is amplified and applied to the output unit 9, which is a speaker of the wireless headphone, and thus,
`a high quality sound in stereo is transmitted to the users ear as an audio signal.
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`The description of the drawings and specifications are merely illustrative of the present design, and is only used for the purpose of describing the present
`design, and is not used to limit the meaning or the scope of the present design described in the utility model registration claims. Therefore, those of
`ordinary skill in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Consequently, the true
`technical protection scope of the present design will have to be determined by the technical idea of the annexed utility model registration claims.
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`Effect of the Design
`According to the present design, by using the code division method, by having a channel separation of 90dB or more and a distortion ratio of 0.01% or
`more, corresponding to the sound quality of audio using a compact disc, since the data transmission rate is set to 1.5 Mbps so as to have high-quality data
`transmission capability, noise and interference are prevented from the audio signal applied to the headphone speakers, thereby providing high-quality
`audio to the user.
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`(57) Scope of Claims
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`Claim 1
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` A
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` transmission circuit of the code division method, comprising, in a transmission circuit for wirelessly transmitting a signal through an antenna (A),
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` codec unit 7 for encoding a signal applied from a signal source 8;
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` central control modem unit 6 for performing error correction by receiving the output of the codec unit 7 as an input and spreading a signal band; and
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` base band unit 5 that receives the output of the central control modem unit 6 as an input, converts it into an intermediate frequency and outputs the
`converted signal;
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`wherein a signal output from the base band unit 5 is amplified and filtered, and a gain of the signal is controlled and transmitted to an antenna A.
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`Claim 2
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` A
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` wireless headphone receiving circuit of the code division method, comprising, in a wireless headphone receiving circuit for amplifying and filtering a
`signal wirelessly applied through an antenna A and controlling a gain to output an audio signal to an output unit 9,
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`a base band unit 5 for processing the gain-controlled signal as an input and processing it at an intermediate frequency;
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` central control modem unit 6 for removing an error correction and a pseudorandom code by receiving the output of the base band unit 5 as an input;
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` codec unit 7 for decoding an audio signal by receiving the output of the central control modem unit 6 as an input; and
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`an amplifier unit 1c that amplifies the signal output from the codec unit 7 as an input and outputs the amplified audio signal to the output unit 9.
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`5-3
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`Petitioner's Exhibit 1010
`Page 003
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`Drawings
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`FIG. 1
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`Unexamined Utility Model 2000-0006888
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`First
`amplifier
`unit
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`First
`filter
`unit
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`Second
`amplifier
`unit
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`Second
`filter unit
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`Conv
`erter
`unit
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`Gain
`control
`unit
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`Base
`band unit
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`Central
`control
`modem
`unit
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`Codec
`unit
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`Signal
`source
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`5-4
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`Petitioner's Exhibit 1010
`Page 004
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`Unexamined Utility Model 2000-0006888
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`FIG. 2
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`First
`amplifier
`unit
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`First
`filter unit
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`Second
`amplifier
`unit
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`Second
`filter unit
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`Conv
`erter
`unit
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`Gain
`control
`unit
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`Base
`band
`unit
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`Central
`control
`modem
`unit
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`Codec
`unit
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`Third
`amplifier
`unit
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`Output
`unit
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`5-5
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`Petitioner's Exhibit 1010
`Page 005
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`TRANSLATOR DECLARATION
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`that:
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`I, Carl T. Sullivan, declare
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`1. I am I am a translator employed by my own company, MasaCa Translation
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`Services LLC.
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`My qualifications are as follows:
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`I possess advanced knowledge of the Korean, Japanese and English languages. My
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`qualifications are: Masters Degree in Second Language Acquisition/Japanese-Korean,
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`work as tenured Associate Professor of Japanese/Korean, 20 years professional experience
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`as Japanese/Korean translator, Active American Translators Association member, former
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`Administrator (President), Japanese Division of the AT A; current Grader, Korean Division
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`of the ATA.
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`I am fluent in both Korean and English and have worked as a Korean -English
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`translator for 20 years.
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`Additional details regarding my qualifications can be found on the attached CV
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`2. The attached Korean into English translation has been translated by me and to the best of
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`my knowledge and belief, it is a true and accurate translation of: KR2010130480(A).
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`3. I declare that all statements made herein of my own knowledge are true and all statements
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`made on information and belief are believed to be true, and further that these statements
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`were made with the knowledge that willful false statements and the like are punishable by
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`fine or imprisonment, or both, under 18 U.S.C. 1001, and that such willful false
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`statements and the like may jeopardize the validity of the application or sub
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`any registration resulting therefrom.
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`Date: 10/30/20
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`Signature:
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`Carl T. Sullivan
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`15 W. 37th Street 8th Floor
`New York, NY 10018
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`212.581.8870
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`ParklP.com
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`Petitioner's Exhibit 1010
`Page 006
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