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JP2002015521

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2002015521
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
portable disk reproducing apparatus in which the recording information is reproduced from an
optical disk as a recording medium and sound is output from a built-in speaker.
[0002]
2. Description of the Related Art At present, CD (compact disc) players dedicated to optical disc
reproduction for audio, MD (mini disc) recorders capable of recording and reproduction, and
recording capacities are leaping as portable disc reproducing apparatuses. DVDs (Digital
Versatile Disc) players and the like that have been improved have been put to practical use.
Among them, a lot of products having a so-called shock proof function have been commercialized
to prevent sound skipping due to vibration at the time of carrying, and some of them have a
built-in speaker while being portable.
[0003]
The shock proof function reproduces the signal recorded on the disc at a speed higher than the
normal speed, stores it in the memory, and reads it at the normal speed, and even if the disc
reproduction is interrupted due to vibration, the memory It is possible to output a reproduction
signal without interruption in the range of storage, and during this time, if the optical pickup
returns to a normal reading position, it is possible to prevent sound skipping.
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[0004]
Among products having a shock proof function, there are products configured to turn on / off the
shock proof function.
This is the selection of taking measures against sound skipping during vibration by turning on
the shock proof function, and taking measures against sound quality deterioration to compress
and store in the shock proof memory by turning off the shock proof function. The shock proof
function is set to ON when emphasis is placed on measures against sound skipping.
[0005]
SUMMARY OF THE INVENTION Such a portable type disc reproducing apparatus, especially with
a built-in speaker, is very close to the speaker and the disc mounting position for compactness
due to its structure. When the shock proof function is used in the OFF state, the sound pressure
of the speaker is increased to increase the volume of the speaker, causing the disc to vibrate,
making it difficult to read a normal signal.
[0006]
SUMMARY OF THE INVENTION In order to solve this problem, the disc reproducing apparatus
according to the present invention reproduces a signal recorded on the disc at a speed higher
than the normal speed, stores it in a memory, and reads it at the normal speed. In addition to
having a shockproof function that enables the output of the reproduction signal without
interruption in the range of storage of the memory even when interruption of reproduction of the
disc occurs due to vibration, the speaker is incorporated in the main body of the apparatus. A
disc reproduction apparatus configured to output the reproduction signal as voice from a
speaker, wherein a shock proof ON / OFF switch for enabling or disabling the shock proof
function and listening by output of the reproduction signal from the speaker can be performed.
Speaker changeover switch, shock proof on / off switch and speaker off Control means for
controlling an output state of the reproduction signal by an operation input of a switch, the
control means being operable to turn on the speaker changeover switch regardless of whether
the shockproof function before the operation is enabled or disabled It is configured to enable the
shock proof function.
[0007]
Thereby, even if a loud vibration is temporarily applied to the disk by raising the sound volume
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of the speaker while the output is switched to the output by the built-in speaker and listening to
it, the shock proof function works and it is difficult for the sound to jump It will be possible to do.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION According to the first aspect of the present
invention, a signal recorded on a disc is reproduced at a speed higher than normal speed, stored
in a memory, and read at normal speed. It has a shock proof function that enables the output of
the reproduction signal without interruption in the range of storage of the memory even if
interruption occurs in the reproduction of the disc due to vibration, and a built-in speaker in the
device body A disk playback apparatus configured to output a playback signal as voice,
comprising: a shock proof ON / OFF switch for enabling or disabling the shock proof function;
and a speaker enabling listening by the output of the playback signal from a speaker By the
operation input of the changeover switch and the shock proof on / off switch and the speaker
changeover switch Control means for controlling the output state of the reproduction signal, the
control means enabling the shockproof function regardless of the state of the shockproof
function before or after the operation by turning on the speaker changeover switch The sound
proofing function acts even if a loud vibration is temporarily applied to the disc by the sound
pressure while raising the volume of the speaker while switching to the output by the speaker
and listening. It has the effect of making it difficult to fly.
[0009]
According to a second aspect of the present invention, as the output means of the reproduction
signal, in addition to the output part to the built-in speaker, an output part to a headphone is
provided, and the speaker switching switch is an output to the speaker and the headphone And
the control means is in a state where the shock proof function is enabled or disabled by the
operation of the shock proof ON / OFF switch in a state where the speaker changeover switch is
switched to the headphone output side. In the case of listening by headphones, the shock proof
function can be enabled or disabled and output according to the listener's preference.
[0010]
According to a third aspect of the present invention, there is provided a sound quality switching
means provided in a signal processing circuit for processing a signal reproduced from the disc,
and a sound quality switching switch for performing an operation input for switching the sound
quality switching means. The control means is configured to set the sound quality switching
means to a predetermined sound quality state regardless of the state by the sound quality
switching means before the operation by turning on the speaker switching switch, and the
headphone is a headphone Even when the sound quality state of bass enhancement is switched
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to the sound quality state of the bass emphasis properly and used, when switching to the built-in
speaker, it is possible to set a predetermined sound quality state, that is, a flat sound quality state
from low to high. It has the effect of being able to forcibly switch from the tone quality state of
the bass emphasis that is likely to generate vibrations in the device body.
[0011]
According to a fourth aspect of the present invention, the speaker incorporated in the apparatus
main body is a position facing the disc mounted on a turntable for driving the disc, and a center
of the speaker supporting the disc. Even if the speaker and the disc are arranged opposite to each
other, a shock is generated when a large vibration is temporarily applied to the disc due to the
sound pressure of the speaker. The proof function operates to make it difficult for the sound to
skip.
[0012]
According to a fifth aspect of the present invention, the speaker is contained in an openable and
closable lid body, and the speaker is configured to be closest to the disc in a closed lid state. The
present invention has the effect of being able to be configured to be the thinnest as a portable
disk reproducing device incorporating the
[0013]
According to the sixth aspect of the present invention, there is provided a signal processing
circuit for processing a signal reproduced by a pickup from a disc, and a speaker is incorporated
in the apparatus main body to output the reproduced signal from the signal processing circuit. A
disk reproducing apparatus configured to be able to output sound from a speaker, wherein the
speaker switching switch enables listening by the output of the reproduction signal from the
speaker, the sound quality switching means provided in the signal processing circuit, and the
sound quality switching A sound quality selection switch for performing an operation input for
switching the means, and control means for controlling an output state of the reproduction signal
by an operation input of the speaker selection switch and the sound quality selection switch, the
control means turning on the speaker selection switch Regardless of the state by the sound
quality switching means before the operation, the sound Even if the switching means is set to a
predetermined sound quality state and the sound quality state of bass emphasis is appropriately
switched and used when listening by headphones, the predetermined sound quality is selected
when switching to the built-in speaker By setting the sound quality to a flat state from the low
band to the high band, it is possible to forcibly switch and use it from the sound quality state of
the bass emphasis that is particularly likely to generate vibrations in the device body.
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[0014]
An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.
[0015]
FIG. 1 is a block diagram of a disk reproducing apparatus according to an embodiment of the
present invention, FIG. 2 is a sectional view of an apparatus main body showing a relationship
between a disk and a speaker, and FIG. 3 is a flowchart of shockproof ON / OFF control. FIG. 4 is
a flowchart of the sound quality switching control.
[0016]
In the figure, 1 is an optical disk, 2 is a spindle motor for rotating the optical disk 1, 3 is an
optical pickup for reading a signal recorded on the optical disk 1, 4 is a driver for controlling the
spindle motor 2 and the optical pickup 3, 5 is It is a signal processing circuit that processes a
signal read by the optical pickup 3.
The signal processing circuit 5 includes an RF amplifier 6, a reproduction processing unit 7, a
memory controller 8, a sound quality switching unit 9, a D / A converter 10 and the like, and
processes a signal read by the optical pickup 3 to obtain a D / A converter 10. While outputting
as an analog signal, a signal relating to focus control and tracking control and a signal for
maintaining rotation at CLV (constant linear velocity) are generated and supplied to the driver 4.
Further, the memory controller 8 writes / reads the digital audio data supplied from the
reproduction processing unit 7 to / from the shockproof memory 11 composed of a RAM used as
a data buffer.
The analog signal output from the signal processing circuit 5 is supplied to the built-in speaker
13 through the speaker amplifier 12 and to the headphone 17 connected to the cord 16 through
the headphone amplifier 14 and the jack plug 15. Is configured as.
[0017]
Reference numeral 18 denotes a system controller, 19 denotes a display unit, and 20 denotes an
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5
operation unit.
The system controller 18 controls the controlled unit in the apparatus such as the signal
processing circuit 5 based on data from the signal processing circuit 5 and an operation signal of
the operation unit 20, the details of which will be described later.
The display unit 19 performs various displays necessary for the user under the control of the
system controller 18.
The operation unit 20 also has a speaker switching switch SW1 that switches whether the output
is output to the speaker 13 or a headphone 17, and a shockproof ON / OFF switch SW2 that
switches whether the shockproof function is enabled or disabled. And a sound quality
changeover switch SW3 and a plurality of switches SW4 to SWn necessary for reproduction,
stop, and other operations of the reproduction apparatus.
[0018]
Here, a shock proof function by the memory controller 8 and the shock proof memory 11 will be
described.
The shock proof function can be selected by shock proof ON / OFF switch SW 2 as to enable or
disable. When OFF is selected, the system controller 18 controls the disc 1 to select The
reproduction is performed at a normal speed, and the reproduced data is processed and output
by the signal processing circuit 5. At this time, the memory controller 8 processes without
writing to the shockproof memory 11, and outputs at a normal speed. It will be done.
On the other hand, when ON is selected by the shock proof ON / OFF switch SW2, under the
control of the system controller 18, in order to enable the shock proof function, reproduction is
performed faster than normal speed from the disk 1, and the memory controller 8 Write the data
supplied from the reproduction processing unit 7 to the shockproof memory 11 at a
predetermined rate higher than the normal speed, read the data written to the shockproof
memory 11 at the normal speed rate, and The switching unit 9 is supplied.
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[0019]
The memory controller 8 compresses and writes the data in the shockproof memory 11 so that
the storage time for the compression can be extended or the capacity of the memory 11 can be
reduced.
Since the storage in the shock proof memory 11 is performed by compression, the sound quality
of the reproduction signal when the shock proof function is enabled is somewhat lower than that
when the shock proof function is disabled.
In order to avoid this state, a shock proof ON / OFF switch SW2 is provided so that the
preference of the listener, that is, "prevent sound skipping" and "emphasis on sound quality" can
be selected.
[0020]
The sound quality switching unit 9 can be switched under the control of the system controller 18
in response to the operation of the sound quality selection switch SW3. For example, the sound
quality characteristic flat from low to high as "Sound 1". A sound quality characteristic
emphasizing a bass region as "sound quality 2", and a sound quality characteristic where a sound
leakage band of a headphone is attenuated in addition to emphasizing a bass region as "sound
quality 3" are configured to be switchable.
The switching is configured to be sequentially switched to, for example, "sound quality 1"-"sound
quality 2"-"sound quality 3" each time the push button switch is pressed. Then, from the signal
processing circuit 5, a signal corresponding to the sound quality characteristic set by the sound
quality switching unit 9 is output as an analog signal through the D / A converter 10.
[0021]
Although the analog signal output from the signal processing circuit 5 is supplied to the speaker
amplifier 12 and the headphone amplifier 14, the system controller is operated so that one of the
two amplifiers 12 and 14 works and the other is muted. It is controlled by 18. That is, the system
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controller 18 operates to apply a mute control signal to either of the amplifiers 12 and 14 by
performing an operation to switch whether to output to the speaker 13 or to the headphone 17
by the speaker changeover switch SW1. Do. For example, in FIG. 1, when the switching terminal
H is on the headphone side and the switching terminal S is on the speaker side, the illustrated
state is switched to the headphone side, and a mute control signal is applied to the speaker
amplifier 12 side. . By switching in this state, the mute control signal is applied to the headphone
amplifier 14 side, the speaker amplifier 12 side is released, and the speaker is turned on.
[0022]
The positional relationship between the built-in speaker 13 and the disk 1 is configured as shown
in the sectional view of the apparatus main body shown in FIG. In the figure, 21 is a main body
cabinet, 22 is an intermediate cabinet fixed to the main body cabinet 21, and 23 is a lid cabinet
which can be opened and closed. An optical disc reproducing unit 24 integrally formed with the
spindle motor 2 and the optical pickup 3 is attached to the main body cabinet 21 and the
intermediate cabinet 22 and the disc 1 is mounted on a turntable 26 formed on a spindle 25
protruding above the central portion thereof. It is placed. On the other hand, the built-in speakers
13 are provided as a pair for stereo reproduction, and are attached between the sound hole 27
and the inner cover 28 in the lid cabinet 23, and the front surface of the lid cabinet 23 is a
decorative plate 29. It is covered, and it is comprised so that sound emission is possible from the
said speaker 13 via the net part 29a of the decorative plate 29 formed in the opposing position
with the sound hole part 27. FIG. Here, the inner cover 27 is formed at its central portion with a
recess 28a for avoiding the spindle 25 protruding from the disk 1, and the position facing the
speaker 13 is a thin portion 28b.
[0023]
Then, in the closed state of the lid cabinet 23, as shown in FIG. 2, the disc 1 placed on the
turntable 26 and the built-in speaker 13 interpose the thin portion 28b of the inner cover 28. It
is disposed in a very close state, and the protruding spindle 25 is in a state of entering into the
recess 28a. By adopting such a configuration, it is possible to reduce the thickness as a whole in
a portable disk reproducing apparatus. On the other hand, the disc 1 is in a state in which it is
easy to directly receive the vibration due to the sound pressure of the speaker 13.
[0024]
Next, the operation of the disk reproducing apparatus configured as described above will be
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described based on the flowcharts shown in FIG. 3 and FIG.
[0025]
First, the processing of the relationship between the shock proof function and the ON / OFF of
the speaker changeover switch will be described.
In FIG. 3, it is determined whether the shock proof function is to be turned on in step 1
(abbreviated as S1 or similarly abbreviated as step 2). If there is no operation by the shock proof
on / off switch SW2, step S2 is performed. At the next step, "processing by shock proof OFF" in
S3 to S6 is performed. If the ON operation is performed in S1, the process proceeds to S7, and
the "processing by shock proof ON" in S8 to S12 is performed.
[0026]
In S3, it is determined whether the shock proof on / off switch SW2 is further pressed. If it is not
pressed, the process proceeds to S4, and in S4, it is determined whether the speaker changeover
switch SW1 is the speaker on. At S5, the disc reproduction operation process in the shock proof
OFF state is performed, and at the same time, the operation process in the headphone output ON
state is performed at S6 with the speaker output OFF, and the process is repeated from S6 back
to S3. If it is determined that the shock proof on / off switch SW2 is further pressed in the abovedescribed determination of S3, the process proceeds to S7, and if the speaker selection switch
SW1 determines that the speaker is on in the determination of S4, the process proceeds to S7.
Will be transferred to
[0027]
At S8, it is determined whether the speaker changeover switch SW1 is the speaker OFF and the
shock proof ON / OFF switch SW2 is further pressed. If not pressed, the process proceeds to S9,
and the disk play operation in the shock proof ON state is S9. The processing is performed, and it
is determined in the next S10 whether the speaker changeover switch SW1 is the speaker ON,
and if it is ON, the process proceeds to S11, and if it is not ON, the process proceeds to S12. At
S11, operation processing of the speaker output ON state is performed at headphone output OFF,
and at S12, operation processing of the headphone output ON state is performed at speaker
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output OFF, and the processing is repeated from S11 and S12 back to S8. . If it is determined that
the shock proof ON / OFF switch SW2 is further pressed in the above-described S8
determination, the process proceeds to S7, and the process proceeds to "processing by shock
proof OFF".
[0028]
As apparent from the process of FIG. 3, by switching the speaker switch SW1 to the speaker ON
from the listening state by the headphones, the state before the switching is the state by the
“processing by shock proof OFF”. Also, the process of S8-S9-S10-S11-S8 will be repeated until
the speaker changeover switch SW1 is switched to the speaker OFF by forcefully switching to
"processing by shock proof ON", and the volume increases. In this case, even if sound skipping
occurs in the reproduction of the disc due to the vibration of the speaker 13, the shock proof
function works and the output to the speaker 13 can prevent the sound skipping. Also, in the
state where the speaker changeover switch SW1 is switched to the speaker OFF and the listening
state by the headphone 17 is switched, pressing the shockproof ON / OFF switch SW2 shifts
from S8 to S2, and easily “shock proof OFF "Processing by
[0029]
Next, processing of the relationship between the sound quality changeover switch SW3 and the
on / off of the speaker changeover switch SW1 will be described with reference to FIG.
[0030]
At S21, it is determined whether the speaker switching switch SW1 is ON, and if it is ON, the
process proceeds to S22, and at S22 "Sound quality 1", that is, flat regardless of the previous
state of the sound quality switching unit 9. This process is ended by switching to the state of the
sound quality characteristic.
If the switch is not ON in S21, the process proceeds to S23. In S23, it is determined whether the
sound quality switch SW3 is pressed. If the switch SW3 is not pressed, the process is ended. If it
is determined that the button is pressed in S23, the process proceeds to S24, where the output is
switched to (1)-(2)-(3) each time the sound quality changeover switch SW3 is pressed, and S25,
S26, S27 sequentially. The sound quality switching unit 9 is switched so as to be "sound quality
1" in S25, "sound quality 2" in S26, and "sound quality 3" in S27, respectively.
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[0031]
That is, when the speaker changeover switch SW1 is in the speaker ON state, the "sound quality
1" state which is a flat sound quality characteristic is maintained without accepting even if the
sound quality changeover switch SW3 is pressed. Since it is not possible to switch to the "sound
quality 2" of bass enhancement that tends to generate vibrations due to the sound pressure when
sounding, it is possible to minimize the occurrence of sound skipping in the disc 1 due to the
vibration due to the sound pressure of the speaker 13. It becomes. Even if sound skipping occurs
due to the vibration of the disc 1 due to the sound pressure of the speaker 13 in the occurrence
of abnormal sound volume or the like in the "sound quality 1" state, "shock proof ON" in the
speaker ON state as described above. Can be prevented from being generated.
[0032]
In the listening state by the headphones with the speaker off, the sound quality can be switched
according to the preference of the listener, and even if the "sound quality 2" of the bass emphasis
is emphasized, there is no problem of transmitting the vibration to the disc 1, etc. It is something
that can be done.
[0033]
As described above, according to the present invention, the signal recorded on the disc is
reproduced at a speed higher than the normal speed, stored in the memory, and read out at the
normal speed. It has a shock proof function that enables the output of the reproduction signal
without interruption in the range of storage of the memory even when interruption in
reproduction occurs, and a speaker is built into the device body to reproduce the reproduction
signal from the speaker A disk reproducing apparatus configured to be able to output as a disc,
the shock proof ON / OFF switch enabling or disabling the shock proof function, and a speaker
switching switch enabling listening by the output of the reproduction signal from the speaker,
The reproduction by the operation input of the shock proof on / off switch and the speaker
changeover switch Control means for controlling the output state of the switch, the control
means enabling the shock proof function regardless of the state of the shock proof function
before the operation by turning on the speaker changeover switch In this configuration, the
shockproof function works even if a large vibration is temporarily applied to the disc by the
sound pressure by raising the volume of the built-in speaker while switching to the output by the
speaker and listening. The advantageous effect of making it hard to do is obtained.
08-05-2019
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[0034]
Brief description of the drawings
[0035]
1 is a block diagram of a disc reproducing apparatus according to an embodiment of the present
invention.
[0036]
2 is a cross-sectional view of the playback apparatus main body showing the relationship
between the same disc and the speaker
[0037]
Figure 3 Flow chart of shock proof ON / OFF control
[0038]
Figure 4 Flow chart of the same sound quality switching control
[0039]
Explanation of sign
[0040]
Reference Signs List 1 optical disc 2 spindle motor 3 optical pickup 4 driver 5 signal processing
circuit 8 memory controller 9 sound quality switching unit 11 shock proof memory 12 speaker
amplifier 13 speaker 14 headphone amplifier 17 headphone 18 system controller 20 operation
unit SW 1 speaker switching switch SW 2 shock proof ON / OFF switch SW3 Sound quality
selection switch 21 Main cabinet 23 Lid cabinet 25 Spindle 26 Turn table
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