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    基于分段弧形耦合器的AUV三相无线充电系统

    11011131503A1
    发明人
    刘洪臣, 于惠缨, 王有政, 周祺堃, 赵诗雨
    受让人
    -
    申请人
    PROCTER & GAMBLE
    申请号
    308327
    申请日
    2017-01-24
    公开(公告)号
    11011131503A1
    公开(公告)日
    2017-05-04
    IPC分类号
    G01V001/44E21B047/10G01V001/52E21B049/00G01H005/00
    CPC分类号
    -
    优先权号
    068657
    优先权日
    2010-07-14
    摘要

    The solid electrolytic capacitor is a foil consisting of valve metal and conductive macromolecular film such as thiophene aniline. The dielectric skin layer is formed over the foil by anodic oxidn. then hydration processed for 5-30 minutes at 50-95 deg.C in warm water.

    ADVANTAGE -Stabilised current leakage characteristics.

    权利要求
    1. A method of quantizing frequency amplitude data, the method comprising: calculating and quantizing power of frequency amplitudes of an audio signal; normalizing the quantized power using frequency amplitude data; quantizing a first one of even-numbered or odd-numbered data from among the normalized frequency amplitude; interpolating frequency amplitude data that corresponds to a second one of the even-numbered or odd-numbered frequency amplitude data that is not quantized from among the normalized frequency amplitude data using the quantized first one of the even-numbered or odd-numbered data; and quantizing an interpolation error corresponding to a difference between the second one of the even-numbered or odd-numbered frequency amplitude data that is not quantized and the interpolated frequency amplitude data.
    2. A method of quantizing frequency amplitude data, the method comprising: calculating and quantizing power of frequency amplitudes for each of a plurality of bands that make up an audio frame; normalizing frequency amplitude data for each of the bands using the quantized power; quantizing a first one of even-numbered or odd-numbered data of the normalized frequency amplitude data; interpolating frequency amplitude data that corresponds to a second one of the even-numbered or odd-numbered frequency amplitude data that is not quantized from among the normalized frequency amplitude data using the quantized first one of the even-numbered or odd-numbered data quantized; and quantizing an interpolation error corresponding to a difference between the second one of the even-numbered or odd-numbered frequency amplitude data that is not quantized and the interpolated frequency amplitude data that is generated by interpolation.
    3. An audio encoding method, comprising: detecting a frequency envelope of a wideband error signal of an audio signal; removing the detected frequency envelope from the wideband error signal to obtain a frequency amplitude and a frequency phase; encoding the obtained frequency amplitude and frequency phase, the encoding of the frequency amplitude comprising: calculating and quantizing power of frequency amplitudes for each of a plurality of bands that make up an audio frame, normalizing frequency amplitude data for each of the bands using the quantized power, and quantizing a first one of even-numbered or odd-numbered data from among the normalized frequency amplitude data; interpolating frequency amplitude data that corresponds to a second one of the even-numbered or odd-numbered frequency amplitude data that is not quantized from among the normalized frequency amplitude data using the quantized first one of the even-numbered or odd-numbered data; and quantizing an interpolation error corresponding to a difference between the second frequency amplitude data that is not quantized and the interpolated frequency amplitude data.
    4. An apparatus to quantize frequency amplitude data, the apparatus comprising: a power calculation unit to calculate power of frequency amplitudes for each of a plurality of bands making up an audio frame; a power quantization unit to quantize the calculated power; an amplitude normalization unit to normalize frequency amplitude data for each of the bands using the quantized power; a normalized data quantization unit to quantize a first one of even-numbered or odd-numbered data from among the normalized frequency amplitude data; an interpolation unit to interpolate frequency amplitude data that corresponds to a second one of the even-numbered or the odd-numbered frequency amplitude data that is not quantized by the normalized data quantization unit from among the frequency amplitude data normalized by the amplitude normalization unit using the first quantized frequency amplitude data from among the normalized frequency amplitude data; and an interpolation error quantization unit to quantize an interpolation error corresponding to a difference between the second frequency amplitude data that is not quantized and the interpolated frequency amplitude data.
    5. An audio encoder, comprising: an envelope detection unit to detect a frequency envelope of a wideband error signal of an audio signal; a frequency amplitude/phase obtaining unit to remove the detected frequency envelope from the wideband error signal to obtain a frequency amplitude and a frequency phase; a frequency phase encoding unit to encode the obtained frequency phase; a frequency amplitude encoding unit to encode the obtained frequency amplitude, the frequency amplitude encoding unit comprising: a power calculation unit to calculate and quantize power of frequency amplitudes for each of a plurality of bands that make up an audio frame, a power quantization unit to quantize the calculated power, an amplitude normalization unit to normalize frequency amplitude data for each of the bands using the quantized power, and a normalized data quantization unit to quantize a first one of even-numbered or odd-numbered data from among the normalized frequency amplitude data; an interpolation unit to interpolate frequency amplitude data to correspond to a second one of the even-numbered or odd-numbered frequency amplitude data that is not quantized by the normalized data quantization unit from among the frequency amplitude data normalized by the amplitude normalization unit using the quantized first frequency amplitude data from among the normalized frequency amplitude data; and an interpolation error quantization unit to quantize an interpolation error corresponding to a difference between the second frequency amplitude data that is not quantized and the interpolated frequency amplitude data.
    6. An encoding apparatus, comprising: an envelope detection unit to detect an envelope of a wideband error signal having at least one frame divided into a first data portion and a second data portion; a frequency amplitude/phase obtaining unit to obtain frequency amplitude data and frequency phase data of the first and second data portions of the wideband error signal based on the detected envelope; and a frequency amplitude encoding unit to interpolate an approximation of the frequency amplitude data of the second data portion from the first data portion, to determine an interpolation error between the frequency amplitude data of the second data portion and the interpolated approximation thereof, and to encode the frequency amplitude data of the first data portion and the determined interpolation error.
    7. The encoding apparatus of claim 6 , wherein the first and second data portions comprise data first and second sub-frames, respectively, of the at least one frame.
    8. The encoding apparatus of claim 6 , wherein the first and second data portions comprise data from a first plurality of frequency bands and a second plurality of frequency bands, respectively, of the at least one frame.
    9. The encoding apparatus of claim 6 , wherein the frequency amplitude encoding unit comprises: a first quantization unit to quantize the frequency amplitude data of the first data portion; and a second quantization unit to quantize the determined interpolation error.
    10. The encoding apparatus of claim 6 , wherein the frequency amplitude encoding unit comprises a cubic interpolation unit to interpolate the approximation of frequency amplitude data of the second data portion based on the frequency amplitude data of the first data portion.
    11. A method of dequantizing frequency amplitude data, the method comprising: dequantizing a value (RMS index) obtained by quantizing power of frequency amplitudes included in a bitstream to restore the power of the frequency amplitudes; dequantizing a quantized first one of even-numbered or odd-numbered normalized frequency amplitude data included in the bitstream to restore the first one of the even-numbered or odd-numbered normalized frequency amplitude data; interpolating the restored normalized first frequency amplitude data to generate frequency amplitude data that corresponds to a second one of the even-numbered or odd-numbered frequency amplitude data that is not restored from among normalized frequency amplitude data; dequantizing quantized interpolation error data included in the bitstream to restore the interpolation error data; and denormalizing the restored first frequency amplitude data, the frequency amplitude data generated by the interpolation operation, and the restored interpolation error data using the restored power of the frequency amplitudes to restore the frequency amplitude data.
    12. The method of claim 11 , wherein the dequantizing of the frequency amplitude data is performed for each of a plurality of bands making up an audio frame that is transformed into a frequency domain.
    13. An audio decoding method, comprising: restoring a frequency amplitude; restoring a frequency phase; restoring a frequency envelope of a wideband error signal using the restored frequency amplitude and frequency phase; wherein the restoring of the frequency amplitude comprises: dequantizing a value (RMS index) obtained by quantizing power of frequency amplitudes included in a bitstream to restore the power of the frequency amplitudes, generating a sequence of impulses corresponding to a number of frequency amplitudes to be restored, multiplying the generated impulses by the restored power of the frequency amplitudes to restore the frequency amplitudes, and the method further comprises: dequantizing a quantized first one of even-numbered or odd-numbered normalized frequency amplitude data included in the bitstream to restore the first one of the even-numbered or odd-numbered normalized frequency amplitude data; interpolating the restored normalized frequency amplitude data to generate frequency amplitude data that corresponds to a second one of the even-numbered or odd-numbered frequency amplitude data that is not restored from among normalized frequency amplitude data; dequantizing quantized interpolation error data included in the bitstream to restore the interpolation error data; and denormalizing the restored first frequency amplitude data, the frequency amplitude data generated by the interpolation operation, and the restored interpolation error data using the restored power of the frequency amplitudes to restore the frequency amplitude data.
    14. An apparatus to dequantize frequency amplitude data, the apparatus comprising: a frequency power restoration unit to dequantize a value (RMS index) obtained by quantizing power of frequency amplitudes included in a bitstream to restore the power of the frequency amplitudes; a normalized data restoration unit to dequantize a quantized first one of even-numbered or odd-numbered normalized frequency amplitude data included in the bitstream to restore the first one of the even-numbered or odd-numbered normalized frequency amplitude data; a normalized data interpolation unit to interpolate the restored normalized first frequency amplitude data to generate frequency amplitude data that corresponds to a second one of the even-numbered or odd-numbered frequency amplitude data that is not restored by the normalized data restoration unit from among normalized frequency amplitude data; an interpolation error restoration unit to dequantize quantized interpolation error data included in the bitstream to restore the interpolation error data; and a third frequency amplitude restoration unit to denormalize the first frequency amplitude data restored by the normalized data restoration unit, the frequency amplitude data generated by the normalized data interpolation unit by the interpolation, and the interpolation error data restored by the interpolation error restoration unit, using the power of the frequency amplitudes restored by the frequency power restoration unit to restore the frequency amplitude data.
    15. The apparatus of claim 14 , wherein the frequency power restoration unit, the normalized data restoration unit, the normalized data interpolation unit, the interpolation error restoration unit, and the third frequency amplitude restoration unit operate for each of a plurality of bands making up an audio frame that is transformed into a frequency domain.
    16. A dequantizing apparatus, comprising: an even-numbered position dequantizing unit to dequantize a first amplitude vector at an even-numbered position corresponding to even-numbered amplitude indices received in a bitstream; an odd-numbered position interpolation unit to obtain a second amplitude vector at an odd-numbered position based on the dequantized first amplitude vector; an interpolation error dequantization unit to dequantize an interpolation error at an odd-numbered position corresponding to odd-numbered amplitude indices received in the bitstream; and a plurality of interframe interpolation units to perform dequantization at a plurality of scalability levels based on the first and second amplitude vectors and the dequantized interpolation error.
    17. An audio decoder, comprising: a frequency amplitude restoring unit to restore a frequency amplitude; a frequency phase restoring unit to restore a frequency phase; a frequency envelope restoring unit to restore a frequency envelope of a wideband error signal using the restored frequency amplitude and frequency phase, wherein the frequency amplitude restoring unit comprises: a frequency power restoration unit to dequantize a value (RMS index) obtained by quantizing power of frequency amplitudes included in a bitstream to restore the power of the frequency amplitudes, an impulse sequence generation unit to generate a sequence of impulses corresponding to a number of frequency amplitudes to be restored, and a frequency amplitude restoration unit to multiply the generated impulses by the restored power of the frequency amplitudes to restore the frequency amplitudes; a normalized data restoration unit to dequantize a quantized first one of even-numbered or odd-numbered normalized frequency amplitude data included in the bitstream to restore the first one of the even-numbered or odd-numbered normalized frequency amplitude data; a normalized data interpolation unit to interpolate the restored normalized first frequency amplitude data to generate frequency amplitude data that corresponds to a second one of the even-numbered or odd-numbered frequency amplitude data that is not restored by the normalized data restoration unit from among normalized frequency amplitude data; an interpolation error restoration unit to dequantize quantized interpolation error data included in the bitstream to restore the interpolation error data; and a frequency amplitude data restoration unit to denormalize the first frequency amplitude data restored by the normalized data restoration unit, the frequency amplitude data generated by the normalized data interpolation unit by the interpolation, and the interpolation error data restored by the interpolation error restoration unit, using the power of the frequency amplitudes restored by the frequency power restoration unit to restore the frequency amplitude data.
    18. A computer-readable recording medium having executable code to perform a method of quantizing frequency amplitude data, the method comprising: calculating and quantizing power of frequency amplitudes of an audio signal; normalizing the quantized power using frequency amplitude data; quantizing a first one of even-numbered or odd-numbered data from among the normalized frequency amplitude; interpolating frequency amplitude data that corresponds to a second one of the even-numbered or odd-numbered frequency amplitude data that is not quantized from among the normalized frequency amplitude data using the quantized first one of the even-numbered or odd-numbered data; and quantizing an interpolation error corresponding to a difference between the second one of the even-numbered or odd-numbered frequency amplitude data that is not quantized and the interpolated frequency amplitude data.
    19. A computer-readable recording medium having executable code to perform a method of quantizing frequency amplitude data, the method comprising: calculating and quantizing power of frequency amplitudes for each of a plurality of bands that make up an audio frame; normalizing frequency amplitude data for each of the bands using the quantized power; quantizing a first one of even-numbered or odd-numbered data of the normalized frequency amplitude data; interpolating frequency amplitude data that corresponds to a second one of the even-numbered or odd-numbered frequency amplitude data that is not quantized from among the normalized frequency amplitude data using the quantized first one of the even-numbered or odd-numbered data quantized; and quantizing an interpolation error corresponding to a difference between the second one of the even-numbered or odd-numbered frequency amplitude data that is not quantized and the interpolated frequency amplitude data that is generated by interpolation.
    20. A computer-readable recording medium having executable code to perform an audio encoding method, comprising: detecting a frequency envelope of a wideband error signal of an audio signal; removing the detected frequency envelope from the wideband error signal to obtain a frequency amplitude and a frequency phase; encoding the obtained frequency amplitude and frequency phase, the encoding of the frequency amplitude comprising: calculating and quantizing power of frequency amplitudes for each of a plurality of bands that make up an audio frame, normalizing frequency amplitude data for each of the bands using the quantized power, and quantizing a first one of even-numbered or odd-numbered data from among the normalized frequency amplitude data; interpolating frequency amplitude data that corresponds to a second one of the even-numbered or odd-numbered frequency amplitude data that is not quantized from among the normalized frequency amplitude data using the quantized first one of the even-numbered or odd-numbered data; and quantizing an interpolation error corresponding to a difference between the second frequency amplitude data that is not quantized and the interpolated frequency amplitude data.
    21. A computer-readable recording medium having executable code to perform a method of dequantizing frequency amplitude data, the method comprising: dequantizing a value (RMS index) obtained by quantizing power of frequency amplitudes included in a bitstream to restore the power of the frequency amplitudes; dequantizing a quantized first one of even-numbered or odd-numbered normalized frequency amplitude data included in the bitstream to restore the first one of even-numbered or odd-numbered normalized frequency amplitude data; interpolating the restored normalized first frequency amplitude data to generate frequency amplitude data that corresponds to a second one of the even-numbered or odd-numbered frequency amplitude data that is not restored from among normalized frequency amplitude data; dequantizing quantized interpolation error data included in the bitstream to restore the interpolation error data; and denormalizing the restored first frequency amplitude data, the frequency amplitude data generated by the interpolation operation, and the restored interpolation error data using the restored power of the frequency amplitudes to restore the frequency amplitude data.
    22. A computer-readable recording medium having executable code to perform an audio decoding method, comprising: restoring a frequency amplitude; restoring a frequency phase; restoring a frequency envelope of a wideband error signal using the restored frequency amplitude and frequency phase, wherein the restoring of the frequency amplitude comprises: dequantizing a value (RMS index) obtained by quantizing power of frequency amplitudes included in a bitstream to restore the power of the frequency amplitudes, generating a sequence of impulses corresponding to a number of frequency amplitudes to be restored, multiplying the generated impulses by the restored power of the frequency amplitudes to restore the frequency amplitudes, the method further comprises: dequantizing a quantized first one of even-numbered or odd-numbered normalized frequency amplitude data included in the bitstream to restore the first one of the even-numbered or odd-numbered normalized frequency amplitude data; interpolating the restored normalized frequency amplitude data to generate frequency amplitude data that corresponds to a second one of the even-numbered or odd-numbered frequency amplitude data that is not restored from among normalized frequency amplitude data; dequantizing quantized interpolation error data included in the bitstream to restore the interpolation error data; and denormalizing the restored first frequency amplitude data, the frequency amplitude data generated by the interpolation operation, and the restored interpolation error data using the restored power of the frequency amplitudes to restore the frequency amplitude data.
    说明书
    [0001]BACKGROUND OF THE INVENTION
    [0002]1. Field of the Invention
    [0003]The present invention relates to an audio output device, and particularly to an audio output device adapted for matching with consuming electronics.
    [0004]2. Description of the Prior Art
    [0005]With the rapid widespread use of the INTERNET, MP 3 (MPEG-1 Audio Layer-3) becomes the most prevalent music format. Basically, the main advantage is the size of audio files compressed in MP 3 format. There aren't many other formats currently available that can reduce file sizes to the same extent as MP3 while keeping fairly good sound quality. Secondly, MP3 files are downloadable directly from the website. Accordingly, the MP 3 player is widely prevalent among the youngster because of its small size, good quality, and multi-functions. Usually, the MP 3 player includes an audio jack mating with an earphone and a data-transmitting port according to USB (Universal Serial Bus) standard connecting with a complementary connector of a computer.
    [0006]As a standard input/output port, USB port is widely used in many kinds of electrical devices. A USB connector commonly comprises an insulative housing defining a tongue board and a plurality of terminals. A number of receiving passageways defined in the insulative housing extend to the tongue board, and the terminals lie in the receiving passageways.
    [0007]To meet with more demands, for instance, two lovers will share the same MP 3 player in some instance. Accordingly, an additional audio jack is required on the basis of the present MP 3 player, thus, the additional audio jack will increase the size of the MP 3 player and complex the structure of the MP 3 player which goes against the trend of miniaturization. Hence, an improved audio device is desired to overcome the disadvantages mentioned-above.
    [0008]BRIEF SUMMARY OF THE INVENTION
    [0009]Therefore, a main object of the present invention is to provide an audio output device achieving the function of transmitting audio signals through USB port.
    [0010]To fulfill the above-mentioned object, audio output device adapted for matching with a MP 3 player, comprises a cap and an earphone assembly connecting with the cap. The cap has a body and a connector received in the body. The connector includes a housing, a number of terminals receiving in the housing and a shielding member enclosing the housing. The connector is capable of matching with a plug according with the standard of USB (Universal Serial Bus), the terminals include three audio terminals transmitting audio signal. The earphone assembly includes two strings connecting with the three audio terminals and a pair of headphones setting on the other end of the strings.
    [0011]Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
    [0012]BRIEF DESCRIPTION OF THE DRAWINGS The foregoing summary, as well as the following detailed description of the embodiments of the present invention, will be better understood when read in conjunction with the appended drawings. For the purpose of illustrating the invention, there are shown in the drawings embodiments which are presently preferred. As should be understood, however, the invention is not limited to the precise arrangements and instrumentalities shown. In the drawings: FIG. 1 is a perspective view of an electrical connector assembly in accordance with the present invention; FIG. 2 is a perspective view of an audio device of the electrical connector assembly shown in FIG. 1 ; FIG. 3 is a partially exploded view of the present electrical connector assembly without earphone assembly; FIG. 4 is a view similar to FIG. 3 , but viewed from another aspect; FIG. 5 is a further exploded view of FIG. 3 ; FIG. 6 is a view similar to FIG. 5 , but viewed from another aspect; FIG. 7 is a perspective view of the first connector of the present invention; and FIG. 8 is a perspective view the second connector of the present invention.
    [0013]DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
    [0014]Reference will now be made in detail to the preferred embodiment of the present invention.
    [0015]Referring to FIGS. 1-2 , an electrical connector assembly 1 comprises a music player 100 and an audio output device 200 mating with the music player 100 according to the present invention. The audio output device 200 comprises a cap 20 mating with the music player 100 and an earphone assembly 30 connecting to the cap 20 .
    [0016]Referring to FIGS. 3-6 , and 8 , the music player 100 comprises a main body 10 , with a first connector 12 mounted on one end of the main body 10 and a traditional audio jack 1020 on the other end of main body 10 . The main body 10 is elongated, and provides a front wall 101 and a rear wall 102 . The front wall 101 defines a cavity 1010 being capable of receiving the first connector 12 , and the rear wall 102 defines a hole for the audio jack 1020 being accessible and capable of mating with the plug of current earphone. The first connector 12 comprises a first housing 122 , a conductive element received in the first housing 122 , and a first shielding member 121 enclosing the first housing 122 . In the preferred embodiment, the conductive element is a PCB (Print Circuit Board), and this PCB forms four first conducting pads 123 and five second conducting pads 124 on the same end thereof and a plurality of third conducting pads on the other end for electrically connecting with components of the music player 100 . The arrangement and intervals of the first conducting pads 123 are according with the standards of the USB. The first conducting pads 123 realize the function of data-transmitting between the traditional music player and computer. Three of the second conducting pads 124 are used to transmitting the audio signal, respectively corresponding to be the left track terminal, right track terminal and the grounding terminal. The conducting pads 123 , 124 are arranged alternatively on the PCB so as to form an integrated port which is capable of matching with the present Female USB port. Certainly, the conductive member is not limited by the print circuit board. In alternative embodiment, it can be achieved by the method of disposing a plurality of terminals on the tongue of the housing.
    [0017]The music player 100 further comprises other modules and connecting members according to the present MP 3 player, and there is no need to make a description about them.
    [0018]Referring to FIGS. 3-6 and 7 , the cap 20 comprises a main body 21 and a second connector 22 received in the main body 21 . In the present embodiment the main body 21 is integrally insert-molded, and in other embodiment the main body 21 may consist of an upper lid and a lower lid. The main body 21 is rectangular shaped, and defines a front wall 211 , a rear wall 212 opposite to the front wall 211 and two side walls 213 , 214 . The front wall 211 of the cap 21 has a receiving cavity 2110 to receive the second connector 22 , whereas the rear wall 212 defines a pair of through holes 2120 communicating with the receiving cavity 2110 . Each of the side walls 213 , 214 defines a pair of projections 2151 , 2152 disposed opposite to each other along the vertical direction. The inside of the projections 2151 , 2152 are respectively characterized as arc shaped, and the two projections 2151 , 2152 together form an arc retention groove 215 opening toward outside. The second connector 22 comprises a second housing 222 , four third terminals 223 and five fourth terminals 224 respectively assembled to the second housing 222 , and a second shielding member 221 enclosing the second housing 222 . The third terminals 223 are according with the standards of the USB with respect to the arrangement and the interval, and each comprises a contacting portion 2231 and a tail portion 2232 . Each of the fourth terminal 224 comprises a contacting portion 2241 and a tail portion 2242 , and three of the fourth terminals 224 are utilized to realize the function of transmitting the audio signal corresponding to the left track terminal, the right track terminal and the grounding terminal. In the present embodiment, the other two fourth terminals 224 are left free for any use. The second housing 222 comprises a tongue board 2221 and a rear portion 2223 , and the tongue board 2221 defines a plurality of receiving passageways (not labeled) arranged in a row side by side. The third and fourth terminals 223 , 224 are received in the receiving passageways at intervals. The rear portion 2223 defines an upper row of slots and a lower row of slots respectively receiving the tail portions 2232 of the third terminals 223 and the tail portions 2242 of the fourth terminals 224 . In preferred embodiment, the four third terminals 223 do not provide the function of electrical signal transmitting, but the contacting portions 2231 of the third terminals 223 can strengthen the reliability when mating with the first connector 12 .
    [0019]Referring to FIGS. 1-2 , the earphone assembly 30 comprises a hanging cord 31 , two headphones 33 and two strings 32 connecting with the headphones 33 and the second connector 22 . The two strings 32 keep close to the hanging cord 31 or go through the hanging cord 31 . One end of each string 32 connects to corresponding headphone 33 and the other end of the string 32 protrudes through corresponding through hole 2120 to be soldered with corresponding tail portion 2242 of the three audio terminals 224 of the second connector 22 . Each headphone 33 comprises a rod 331 and a headphone unit 332 mounted on the rod 331 .
    [0020]In process of using, the cap 20 mates with the music player 100 , that is the first connector 12 mates with the second connector 22 . In the meanwhile, the second terminals 124 contact with corresponding fourth terminals 224 . The hanging cord 31 can be hung on neck of user. Two persons can share the music by the traditional audio jack 1020 plus the cap 20 shown in the present invention. The rods 331 of the headphones 33 are received in corresponding retention grooves 215 in order to prevent the headphones 33 from swinging when the music player 100 is not in use.
    [0021]It is to be understood, however, that even though numerous, characteristics and advantages of the present invention have been set fourth in the foregoing description, together with details of the structure and function of the invention, the disclosed is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
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