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JP2005203857

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DESCRIPTION JP2005203857
PROBLEM TO BE SOLVED: To provide a portable music player capable of preventing water
intrusion and the like. SOLUTION: This portable music player 1 comprises a main body 2 and a
headset 3. The main body 2 includes a battery 21, an oscillator 22, a flash memory 23, an MP3
decoder 24, a D / A converter 25, a modulator 26, a multiplexer 27, a transmitter 28, and a coil
29. Do. The headset 3 comprises a card unit 4 and a stereo speaker 5. The card unit 4 includes a
coil 31, a splitter 32, a rectifier 33, a demodulator 34, and an amplifier 35. [Selected figure]
Figure 1
Portable music player
[0001]
The present invention relates to portable music players.
[0002]
2. Description of the Related Art Conventionally, portable music players for recording audio
signals on a magnetic recording medium (magnetic tape, magnetic disk, etc.) and listening to
music while away from home are widely used.
In recent years, a flash memory for recording compressed digital audio data such as MP3 (MPEG1 Audio Layer-3), a hard disk drive, etc. is incorporated in the main body, and the digital audio
data is decoded, D / A converted, and By amplification, portable music players that output sound
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from speakers in headsets are also being used.
[0003]
Conventional portable music players can be classified into the following three types in terms of
transmission and reception of signals between the main body and the headset. (1) Fixed (nonseparable) connection of the main body and the headset by a conducting wire (2) The main body
and the headset have conductive terminals (respectively called “stereo mini jack” and “stereo
mini plug” (3) The main unit transmits audio signals as radio waves, and the headset with a
built-in battery receives these radio waves and outputs audio
[0004]
In the portable music player of the type (1) above, there is a problem that it is not possible to
replace only one who has a failure when either the main unit or the headset has a failure. There
is a problem that is inconvenient. The portable music player of the type (2) above has a problem
that water may infiltrate from the terminal on the main body side. Further, depending on the
contact state between the terminal on the main body side and the terminal on the headset side,
the resistance or impedance between these terminals may change, which may lead to the
deterioration of the sound quality. Furthermore, deterioration (oxidation, corrosion, etc.) of the
surface of the terminal on the headset side or the main body side may occur, which may lead to
deterioration of the sound quality.
[0005]
In the portable music player of the type (3) above, the headset has a problem that it becomes
large and heavy because it has a battery. In addition, there is a security problem that the radio
waves transmitted by the main body may be received by others.
[0006]
By the way, there is known an IC card with a noncontact transmission mechanism which can
obtain electric power by rectifying a signal received by an antenna or a coil (see, for example,
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Patent Document 1). Such an IC card capable of rectifying a signal received by a coil or the like to
obtain electric power is standardized as an "IC card without an external terminal" (ISO / IEC
10536-1, JIS X 6321-1 etc).
[0007]
JP 2001-209772
[0008]
Then, in view of the above-mentioned point, an object of the present invention is to provide a
portable music player which can prevent degradation of sound quality due to a contact state
between terminals and the like.
[0009]
In order to solve the above problems, a portable music player according to the present invention
is a first for converting a signal obtained by multiplexing an audio signal and a second signal
having a frequency different from that of the audio signal into an electromagnetic wave and
transmitting the electromagnetic wave. A device receives an electromagnetic wave, and is split
into an audio signal and a second signal, power is obtained based on the second signal obtained
by splitting, and the obtained power is used to generate an audio signal. And a second device for
outputting a based voice.
[0010]
In this portable music player, the first device may transmit the audio signal as an analog signal or
a digital signal to the second device.
Further, the frequency of the second signal may be higher than the frequency of the audio signal.
[0011]
According to the present invention, it is possible to prevent the deterioration of the sound quality
due to the contact state between the terminals and the like.
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[0012]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
In addition, the same referential mark is attached | subjected to the same component, and
description is abbreviate | omitted.
FIG. 1 is a view showing a portable music player according to a first embodiment of the present
invention.
As shown in FIG. 1, this portable music player 1 comprises a main body 2 and a headset 3. The
headset 3 comprises a card unit 4 and a stereo speaker 5.
[0013]
FIG. 2 is a view showing an internal configuration of the main body 2. As shown in FIG. 2, the
main body 2 includes a battery 21, an oscillator 22, a flash memory 23, an MP3 (MPEG-1 Audio
Layer-3) decoder 24, a D / A converter 25, and a modulator 26. A coupler 27, a transmitter 28
and a coil 29 are provided. The battery 21 supplies power to the oscillator 22, the flash memory
23, the MP3 decoder 24, the D / A converter 25, the modulator 26, the multiplexer 27, and the
transmitter 28.
[0014]
The oscillator 22 receives supply of electric power from the battery 21 and has a signal of a
predetermined frequency (for example, 13.56 MHz (a frequency used in ISO / IEC 15693-1, JIS X
6323-1, etc.) or the like (hereinafter referred to as Generate a “power signal” and output it to
the multiplexer 27. The flash memory 23 records digital audio data encoded in MP3.
[0015]
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The MP3 decoder 24 decodes the digital audio data recorded in the flash memory 23 and
outputs the data to the D / A converter 25. The D / A converter 25 converts the digital audio data
output from the MP3 decoder 24 into an analog audio signal and outputs the analog audio signal
to the modulator 26. The frequency of the audio signal is generally about 20 Hz to 20 KHz.
[0016]
The modulator 26 modulates the audio signal output from the D / A converter 25 using a
predetermined carrier signal (for example, a signal of 100 kHz or the like). The multiplexer 27
multiplexes the modulation signal (for example, about 100 kHz ± 20 kHz) output from the
modulator 26 and the power signal (for example, 13.56 MHz) output from the oscillator 22 and
outputs the combined signal to the transmitter 28. . The transmitter 28 transmits the signal
output from the multiplexer 27 as an electromagnetic wave to the headset 3 using the coil 29.
[0017]
FIG. 3 is a view showing an internal configuration of the card unit 4 of the headset 3. As shown in
FIG. 3, the card unit 4 includes a coil 31, a splitter 32, a rectifier 33, a demodulator 34, and an
amplifier 35. The coil 31 receives the electromagnetic wave transmitted from the coil 29 in the
main body 2 and converts it into a signal. The splitter 32 splits the signal output from the coil 31
into a power signal and a signal obtained by modulating the audio signal, and outputs the power
signal to the rectifier 33 and outputs the signal obtained by modulating the audio signal to the
demodulator 34. .
[0018]
The rectifier 33 supplies power to the demodulator 34 and the amplifier 35 by rectifying the
power signal. The demodulator 34 receives power supply from the rectifier 33, demodulates the
signal obtained by modulating the audio signal, and outputs the audio signal to the amplifier 35.
[0019]
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The amplifier 35 receives the supply of power from the rectifier 33, amplifies the audio signal
output from the demodulator 34, and supplies a drive signal to the stereo speaker 5. The stereo
speaker 5 outputs sound in accordance with the drive signal supplied from the amplifier 35.
[0020]
Generally, about 20 mW is required to drive the stereo speaker 5. In addition, about 30 mW is
considered to be necessary for the operation of the card unit 4. Therefore, the entire headset 3
requires approximately 50 mW of power, and it is necessary to supply the power from the main
body 2 to the headset 3 by electromagnetic waves. At present, what is called "proximity type"
(ISO / IEC 14443-1, JIS X 6322-1, etc.) in "IC card without external terminals" (ISO / IEC 105361, JIS X 6321-1, etc.) The power consumption of the semiconductor integrated circuit used is
also approximately 50 mW. Therefore, it is sufficiently possible to supply the power
(approximately 50 mW or so) necessary for outputting the sound from the stereo speaker 5 from
the main body 2 to the headset 3.
[0021]
Further, in the "proximity" standard "IC card without external terminal" (ISO / IEC 14443-1, JIS X
6322-1, etc.), the communicable distance is within 10 cm. On the other hand, in the portable
music player 1, if the distance between the coil 29 in the main body 2 and the coil 31 in the card
part 4 of the headset 3 is approximately 10 mm or less, the power transmission loss can be
reduced to about 65%. The electric field strength can be about 500 μV / m. Therefore, the coil in
the card part 4 of the headset 3 is stored in a card (resin plate etc.) of the same size as the "IC
card without external terminals" (54.0 mm long, 85.7 mm wide, 0.76 mm thick) It is possible
enough to do.
[0022]
As described above, in the portable music player 1, since the main body 2 and the headset 3 are
separated, when the main body 2 or the headset 3 breaks down, it is possible to replace only the
broken one. is there. Further, in the portable music player 1, terminals such as a stereo mini jack
and a stereo mini plug are not used. Therefore, it is possible to prevent water from invading the
inside of the main body 2, and to prevent the sound quality from being deteriorated due to the
contact state between the terminals. Also, in the portable music player 1, the headset 3 does not
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require a battery. Therefore, it is possible to make the headset 3 smaller and lighter.
[0023]
In addition, the distance between the coil 29 in the main body 2 and the coil 31 in the card part
4 of the headset 3 is approximately 10 mm or less, and the electromagnetic wave capable of
receiving up to about 10 mm away from the main body 2 is If it transmits, it can prevent that the
electromagnetic wave which the main body 2 transmits to the headset 3 is received by others.
[0024]
Next, a portable music player according to a second embodiment of the present invention will be
described.
FIG. 4 is a view showing a portable music player according to a second embodiment of the
present invention. As shown in FIG. 4, the portable music player 41 comprises a main body 42
and a headset 43. The headset 43 comprises a card unit 44 and a stereo speaker 5.
[0025]
FIG. 5 is a view showing an internal configuration of the main body 42. As shown in FIG. As
shown in FIG. 5, the main body 42 includes a battery 21, a flash memory 23, a coil 29, an
oscillator 51, a parallel-serial converter 52, a digital modulator 53, a multiplexer 54, and a
transmitter. And 55. The battery 21 supplies power to the flash memory 23, the oscillator 51, the
parallel-serial converter 52, the digital modulator 53, the multiplexer 54, and the transmitter 55.
[0026]
The oscillator 51 receives supply of power from the battery 21, generates a signal of a
predetermined frequency (hereinafter, referred to as “power signal”), and outputs the signal to
the multiplexer 54. The flash memory 23 records digital audio data encoded in MP3.
[0027]
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The parallel-serial converter 52 converts digital audio data (parallel digital signal) encoded in
MP3 into a serial digital signal. The digital modulator 53 uses PSK (phase shift keying), FSK
(frequency shift keying), ASK (amplitude shift keying), or other methods for the serial digital
signal output from the parallel-serial converter 52. Modulation.
[0028]
The multiplexer 54 multiplexes the modulation signal output from the digital modulator 53 and
the power signal output from the oscillator 51, and outputs the multiplexed signal to the
transmitter 55. The transmitter 55 uses the coil 29 to transmit the signal output from the
multiplexer 54 to the headset 3 as an electromagnetic wave.
[0029]
FIG. 6 is a diagram showing an internal configuration of the card unit 44 of the headset 43. As
shown in FIG. As shown in FIG. 6, the card unit 44 includes an MP3 decoder 24, a D / A
converter 25, a coil 31, a demultiplexer 61, a rectifier 62, amplifiers 63 and 66, and a digital
demodulator 64. And a serial-to-parallel converter 65. The splitter 61 splits the signal output
from the coil 31 into a high frequency band signal (power signal) and a low frequency band
signal (signal obtained by modulating the audio signal), and reduces the power signal to the
rectifier 62. The frequency band signal is output to the amplifier 63.
[0030]
The rectifier 62 supplies power to the MP3 decoder 24, the D / A converter 25, the amplifiers 63
and 66, the digital demodulator 64, and the serial-parallel converter 65 by rectifying the power
signal. The amplifier 63 receives power supply from the rectifier 62 and amplifies the low
frequency band signal.
[0031]
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The digital demodulator 64 receives power supply from the rectifier 62 and demodulates the
signal output from the amplifier 63. The serial-to-parallel converter 65 receives the supply of
power from the rectifier 62 and converts the signal (serial digital signal) output from the digital
demodulator 64 into a parallel digital signal (MP3 data).
[0032]
The MP3 decoder 24 receives power supply from the rectifier 62 and decodes digital audio data
(MP3 data) output from the serial-to-parallel converter 65. The D / A converter 25 converts
digital audio data output from the MP3 decoder 24 into an audio signal. The amplifier 66
amplifies the audio signal output from the D / A converter 25 and drives the stereo speaker 5.
The stereo speaker 5 outputs sound in accordance with the drive signal supplied from the
amplifier 66.
[0033]
Thus, in the portable music player 41, since the main body 42 and the headset 43 are separated,
when the main body 42 or the headset 43 breaks down, it is possible to replace only the broken
one. Further, in the portable music player 41, it is possible to prevent water from invading the
inside of the main body 42, and to prevent deterioration of the sound quality. Furthermore, in the
portable music player 41, it is possible to make the headset 43 smaller and lighter.
[0034]
The invention is available in portable music players.
[0035]
FIG. 1 shows a portable music player according to a first embodiment of the invention.
The figure which shows the internal structure of the main body 2 of FIG. The figure which shows
the internal structure of the headset 3 of FIG. FIG. 7 shows a portable music player according to a
second embodiment of the present invention. The figure which shows the internal structure of
the main body 42 of FIG. The figure which shows the internal structure of the headset 43 of FIG.
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Explanation of sign
[0036]
DESCRIPTION OF SYMBOLS 1, 41 portable music player, 2, 42 main body, 3, 43 headset, 4, 44
card part, 5 stereo speaker, 21 battery, 22 51 oscillator, 23 flash memory, 24 MP3 decoder, 25
D / A converter, Reference Signs List 26 modulator, 27, 54 multiplexer, 28, 55 transmitter, 29,
31 coil, 32, 61 demultiplexer, 33, 62 rectifier, 34 demodulator, 35, 63, 66 amplifier, 52 parallelserial conversion , 53 digital modulators, 64 digital demodulators, 65 serial to parallel converters
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