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JPH11225393

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH11225393
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio reproduction apparatus.
[0002]
2. Description of the Related Art In headphone-type stereo cassette players, that is, so-called
headphone stereos, a cord connecting the main body and the headphones may be troublesome or
obstructive.
[0003]
Therefore, in some headphone stereos, the space between the main unit and the headphones is
wireless, and the audio signal reproduced by the main unit is sent to the headphones by the FM
wave.
In addition, an adapter has also been put on the market where an audio signal reproduced by a
deck type audio reproducing apparatus is sent to headphones by infrared rays.
[0004]
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However, in the case of using an FM wave, for example, when used in a train, interference with
other similar headphone stereos or noise is caused. I will receive it. Moreover, when using
infrared rays, it must be in a state where between transmitter and headphones can be seen.
[0005]
Furthermore, headphones require a circuit to receive the transmitted FM waves and infrared rays
and extract the original audio signal from the received signal, and it is necessary to take
measures against the power consumption.
[0006]
The present invention is intended to solve the above problems.
[0007]
Therefore, in the present invention, the present invention includes a headphone, a playback
terminal that is detachable from the headphone, and a server, and the playback terminal stores
digital audio data. A storage means for storing the digital audio data, and a D / A converter circuit
for D / A converting the digital audio data extracted from the storage means into an analog audio
signal; The analog audio output from the D / A converter circuit, loading the digital audio data
stored in the other large-capacity storage means into the storage means of the reproduction
terminal; According to another aspect of the present invention, there is provided an audio
reproduction apparatus in which an audio signal is supplied to a sound unit of the headphone.
Therefore, the digital digital audio data of the server is loaded into the storage means of the
playback terminal, and the loaded digital audio data is D / A converted to an analog audio signal
and supplied to the sound unit of the headphone during playback.
[0008]
DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 100 denotes a
reproduction terminal, 200 denotes a headphone, and 300 denotes a server.
[0009]
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The reproduction terminal 100 has a large-capacity non-volatile storage means for storing digital
audio data, such as a flash memory 110, a reproduction circuit 120, and a microcomputer 130
for control.
In this case, the digital audio data stored in the memory 110 is a signal in which the original
digital audio data is data-compressed to about 1⁄5 the amount of data by the ATRAC processing
used for the mini disc, for example (ATRAC Is a registered trademark).
[0010]
Also, the playback circuit 120 decodes the digital audio data read from the memory 110 into the
original digital audio data, and D converts the decoded digital audio data into an analog audio
signal. / A converter circuit 122 and an amplifier 123 to which the audio signal is supplied, and
an analog audio signal from the amplifier 123 is output to a terminal 141.
[0011]
Further, the microcomputer 130 controls writing and reading of digital audio data to and from
the memory 110. Therefore, the CPU 131, the ROM 132 in which a control program is written, a
RAM 133 for work area, and an interface for data access The interface circuit 134 is connected
to the terminal 142.
Further, the microcomputer 130 has an infrared remote control receiver circuit 135 and an LCD
136 as a display element for displaying an operation state and the like, in order to enable the
remote control (remote control) operation of the playback terminal 100.
[0012]
Then, as shown in FIG. 2, for example, the reproduction terminal 100 is entirely configured in a
card shape.
[0013]
In addition, the headphone 200 includes left and right acoustic units (electricity / sound
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3
conversion elements) 201L and 201R.
For example, as shown in FIG. 2, the acoustic units 201L and 201R are housed inside the
housings 202L and 202R, and the housings 202L and 202R are provided with ear pads 203L
and 203R, and further, the housings 202L and 202R are held and connected by a band 204.
[0014]
Furthermore, a slit 210 is formed in the housing 202R, and the reproduction terminal 100 can
be removably inserted into the housing 202R through the slit 210.
At this time, the terminals 141 and 142 of the reproduction terminal 100 are provided, for
example, at the tip of the insertion direction, and when the reproduction terminal 100 is inserted
into the housing 202R, the terminals 141 and 142 are inserted. Electrically connected terminals
241 and 242 are provided, and the terminal 241 is connected to the acoustic units 201L and
201R.
[0015]
Further, as shown in FIG. 2, a terminal 243 is provided below the center of the band 204, and the
terminal 243 is connected to the terminal 242.
[0016]
Furthermore, the server 300 is for downloading or supplying digital audio data to the
reproduction terminal 100.
Therefore, in the example shown in FIG. 1, the server 300 is configured of an HDD (hard disk
drive) 310 for storing digital audio data, a write / read circuit 320, and a microcomputer 330 for
controlling them.
[0017]
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In this case, the HDD 310 stores digital audio data in a data-compressed state by ATRAC
processing, and the write / read circuit 320 is for exchanging analog audio signals between the
HDD 310 and the outside. . Therefore, the write / read circuit 320 has an encoder / decoder
circuit 321 for ATRAC processing, an A / D / D / A converter circuit 322, and an external input
terminal 324 and an external output terminal 325 for analog signals.
[0018]
Further, the microcomputer 330 controls access of digital audio data to the reproduction
terminal 100 and the HDD 310, and therefore, the CPU 331, ROM 332 in which a program for
control is written, RAM 333 for work area, data access The interface circuit 334 is connected to
the terminal 343.
[0019]
Further, the microcomputer 330 has an infrared remote control receiver circuit 335 and an LCD
336 as a display element for displaying an operation state and the like, in order to enable an
operation by the remote control of the server 3.
[0020]
For example, as shown in FIG. 2, the terminal 343 is provided on the top surface of the server
300, and when the headphone 200 is hung on the server 300, the terminal 343 is connected to
the terminal 243.
In FIG. 1, reference numerals 160 and 360 indicate transmitters of the infrared remote control,
and the output light of the transmitter 160 is received by the receiving circuit 135 to remote the
reproduction terminal 100, and the output light of the transmitter 360 is received. The light is
received by 335 and the server 300 is remote-controlled.
[0021]
Then, when listening to music or the like with the headphone 200, the reproduction terminal
100 is inserted into the slit 210.
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In addition, when digital audio data such as music is downloaded to the reproduction terminal
100, the headphone 200 into which the reproduction terminal 100 is inserted is hung on the
server 300.
[0022]
In such a configuration, when the server 300 is set to the recording mode, the analog audio
signal is supplied to the A / D / D / A converter circuit 322 through the terminal 324 and A / D
converted to digital audio data, and the digital Audio data is compressed by ATRAC processing in
the encoder / decoder circuit 321 and stored in the HDD 310.
[0023]
When the server 300 is set to the playback mode, digital audio data is extracted from the HDD
310, and the digital audio data is expanded to the original digital audio data by the encoder /
decoder circuit 321 before A / D · D. The signal is supplied to the / A converter circuit 322 and D
/ A converted to an analog audio signal, and the analog audio signal is output to the terminal
325.
[0024]
Furthermore, when the playback terminal 100 and the server 300 are put in the download mode,
digital audio data is extracted from the HDD 310, and this digital audio data is output from the
interface circuit 334 → terminal 343 → terminal 243 → terminal 242 → terminal 142 →
interface The data is written to the memory 110 through the signal line of the circuit 134.
Therefore, music or the like prepared in the server 300 can be downloaded to the memory 110.
[0025]
Then, when the reproduction terminal 100 is set to the reproduction mode, digital audio data is
read from the memory 110, and the digital audio data is expanded to the original digital audio
data by the decoder circuit 121 before the D / A. The signal is supplied to the converter circuit
122 and D / A converted to an analog audio signal, and the analog audio signal is supplied to the
audio units 203L and 203R through the signal line of the amplifier 123 → terminal 141 →
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terminal 241.
Therefore, music and the like downloaded to the memory 110 can be listened to by the
headphone 200.
[0026]
Thus, according to this device, music and the like can be listened to by the headphone 200. In
this case, in particular, according to the above-described device, the reproduction terminal 100 is
directly and integrally connected to the headphone 200. There is no interference with other
headphone stereos or noise pickup. In addition, since the headphone 200 and the reproduction
terminal 100 are integrated, the cord does not get in the way, and the portability is excellent.
[0027]
Furthermore, since it is not necessary to wirelessly transmit an audio signal from the
reproduction terminal 100 to the headphone 100, it is possible to miniaturize the reproduction
terminal 100 without consuming power therefor.
[0028]
Further, when digital audio data is downloaded from the server 300 to the memory 110, the
interface circuit 334 and the interface circuit 134 are directly connected, so that the download
can be performed at high speed, and the time required for the download can be shortened. .
[0029]
In the above, for example, a slit may be provided in the server 300, and the interface circuit 134
may be connected to the interface circuit 334 through the terminal 142 when the reproduction
terminal 100 is inserted into the slit.
Also, instead of the memory 110, a mass storage means such as an HDD can be used.
Furthermore, MPEG2 processing can be used instead of ATRAC processing.
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[0030]
According to the present invention, interference with other headphone stereos and noises are not
picked up. In addition, the code does not get in the way or get messed up, and it is excellent in
portability. Furthermore, the power consumption can be reduced and the size can be reduced. In
addition, digital audio data can be downloaded at high speed, and the time required for
downloading can be shortened.
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