close

Вход

Забыли?

вход по аккаунту

?

JP2004012667

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2004012667
An operation required to adjust the sound quality of an audio signal is troublesome when
reproducing a recording medium on which audio compression data is recorded. SOLUTION: A
sound reproduction having a reproduction mechanism 11 for reading acoustic compression data
from a recording medium and decompressing the acoustic compression data to reproduce and
output an acoustic signal, and an equalizer unit 12 for adjusting the sound quality of the
reproduced acoustic signal In the device 1A, the compression type detection unit 21 that detects
the compression type of the reproduction recording medium, the bit rate detection unit 22 that
detects the bit rate of the recording medium, and the sound quality adjustment value is stored for
each bit rate of the compression type. The memory unit 23 and the control unit 24 for reading
the tone adjustment value corresponding to the detected compression type and bit rate from the
memory unit and controlling the equalizer unit based on the tone adjustment value are provided.
[Selected figure] Figure 1
Sound reproduction device
The present invention relates to an audio system having a function of reproducing, for example, a
recording medium on which audio compression data of MP3 (MPEG 1 Audio Layer III) system or
WMA (Windows (R) Media Audio) system is recorded. The present invention relates to a playback
device. 2. Description of the Related Art FIG. 4 is a block diagram showing a schematic
configuration inside a general sound reproducing apparatus. The sound reproducing apparatus 1
shown in FIG. 4 reads acoustic compression data from a recording medium recording the
acoustic compression data compressed by, for example, MP3 method or WMA method, and
decompresses the read acoustic compression data to obtain an acoustic signal. The reproducing
mechanism 11 for reproducing and outputting, the equalizer unit 12 for adjusting the sound
quality of the acoustic signal reproduced by the reproducing mechanism 11, the amplifier unit
08-05-2019
1
13 for amplifying the acoustic signal adjusted by the equalizer unit 12, and A speaker unit 14 for
acoustically outputting an amplified acoustic signal, a display unit 15 for displaying various
information, an operation unit 16 for inputting various commands, a mechanism control unit 17
for driving and controlling the reproduction mechanism 11, and a display unit It has a display
driver unit 18 for controlling the drive 15 and a microcomputer 19 for controlling the entire
sound reproducing apparatus 1. The recording medium may be, for example, a recording
medium such as a CD-R, a DVD-ROM, a RAM, or a semiconductor memory card capable of
recording acoustically compressed data by the MP3 method or the WMA method. As described
above, according to the general sound reproducing apparatus 1, the sound compression data is
read from the recording medium through the reproduction mechanism 11, and the sound
compression data is expanded to reproduce the sound signal, and the sound is reproduced. Since
the signal is output as sound through the speaker unit 14, sound compression data can be
reproduced even from a recording medium recorded by, for example, the MP3 method or the
WMA method. However, in the method of compressing and recording an acoustic signal as
acoustically compressed data on a recording medium, such as MP3 and WMA, generally, if the
compression rate is increased to lower the bit rate, Since the reproduction band narrows, the
listener may have a thin sound or a sense of shortage in the high region in the sound output.
Therefore, according to the sound reproducing apparatus 1, the sound quality of the sound signal
is adjusted by the equalizer unit 12 according to the predetermined operation from the operation
unit 16 to change the sound quality of the sound signal to the listener's preference. be able to.
However, according to the above-described sound reproducing apparatus 1, the sound quality of
the sound signal is adjusted by the equalizer unit 12 in accordance with the predetermined
operation from the operation unit 16, but, for example, If the compression type and bit rate of
the MP3 system or WMA system are different, it is necessary to adjust the sound quality of the
audio signal each time, and the operation required for the sound quality adjustment becomes
very troublesome.
The present invention has been made in view of the above points, and the object of the present
invention is to automatically reproduce an audio signal according to the compression type and
bit rate when reproducing a recording medium on which audio compression data is recorded. It
is an object of the present invention to provide a sound reproduction device capable of adjusting
the sound quality of the sound. SUMMARY OF THE INVENTION In order to achieve the above
object, an audio reproducing apparatus according to the present invention reads out audio
compression data from a recording medium recording audio compression data, and
decompresses the audio compression data. An audio reproduction apparatus comprising:
reproduction means for reproducing and outputting an acoustic signal in the above, and sound
quality adjustment means for adjusting the sound quality of the acoustic signal reproduced by
the reproduction means, wherein the compression type of compressed acoustic data recorded on
the recording medium By the compression type detection unit, the bit rate detection unit by
which the bit rate of the audio compression data recorded on the recording medium is detected,
08-05-2019
2
the compression type detected by the compression type detection unit, and the bit rate detection
unit. A control means for controlling the sound quality adjustment means to adjust the sound
quality of the sound signal reproduced by the reproduction means based on the detected bit rate
It was to have a door. Therefore, according to the sound reproducing apparatus of the present
invention, the compression type and bit rate of the sound compression data recorded on the
recording medium are detected at the time of reproduction of the recording medium on which
the sound compression data is recorded. Since the sound quality of the sound signal reproduced
by the reproduction means is adjusted based on the above, the adjustment operation by the user
is not necessary, so that the sound quality of the sound signal is automatically adjusted according
to the compression type and the bit rate. Can. Further, according to the sound reproducing
apparatus of the present invention, a storage unit storing a sound quality adjustment value for
adjusting the sound quality of the sound signal for each bit rate of the compression type, and the
control unit is the compression type detecting unit. Based on the compression type detected in
step b and the bit rate detected by the bit rate detection means, the sound quality adjustment
value corresponding to the compression type and bit rate is read out from the storage means,
and the sound quality adjustment value is used based on the sound quality adjustment value. It
was made to control the adjustment means. Therefore, according to the sound reproducing
apparatus of the present invention, the sound quality adjustment value for adjusting the sound
quality of the sound signal is stored in advance for each bit rate of the compression type, and at
the time of reproducing the recording medium recording the sound compression data. Since the
compression type and the bit rate are detected, the sound quality adjustment value
corresponding to the compression type and the bit rate is read out from the storage means, and
the sound quality adjustment means is controlled based on the sound quality adjustment value.
Adjustment work related to
BEST MODE FOR CARRYING OUT THE INVENTION A sound reproducing apparatus according to
an embodiment of the present invention will be described below with reference to the drawings.
The same components as those of the sound reproducing apparatus 1 shown in FIG. 4 are
denoted by the same reference numerals, and the description of the same components and
operations will be omitted. FIG. 1 is a block diagram showing a schematic configuration of the
inside of a microcomputer 20 which is a main part of a sound reproducing apparatus 1A
according to this embodiment. The microcomputer 20 shown in FIG. 1 has a compression type
detection unit 21 for detecting from the mechanism control unit 18 a compression type relating
to acoustic compression data of a recording medium to be reproduced, and a bit rate relating to
acoustic compression data of the recording medium to be reproduced. A bit rate detection unit
22 for detecting the feature from the mechanism control unit 18, a memory unit 23 for storing
the tone adjustment value of the equalizer unit 12 for each bit type of compression type, a
compression type detection unit 21 and a bit rate detection unit 22. A sound quality adjustment
value corresponding to the detected compression type and bit rate is read out from the memory
unit 23, and the control unit 24 adjusts and controls the equalizer unit 12 based on the sound
08-05-2019
3
quality adjustment value. The bit rate detection unit 22 can detect the bit rate by reading the
header portion of the sound compression data through the mechanism control unit 18. FIG. 2 is
an explanatory view briefly showing an example of a tone curve related to the sound quality
adjustment value stored in the memory unit 23. As shown in FIG. The memory unit 23 stores the
sound quality adjustment value for each bit rate of the compression type. For example, in the
case of the MP3 system, the tone shown in FIG. 2A in the case of the bit rate X ≦ 48 kbps. Sound
quality adjustment value of curve A, sound quality adjustment value of tone curve B shown in
FIG. 2B when 48 kbps <X ≦ 64 kbps, sound quality of tone curve C shown in FIG. 2C when 64
kbps <X ≦ 128 kbps The tone value adjustment value of the tone curve D shown in FIG. 2D is
stored when the adjustment value, 128 kbps <X. Similarly, in the WMA method, it is assumed
that tone adjustment values and the like of the tone curves E to H are stored. The tone curve
differs depending on the compression type and bit rate as shown in FIG. 2. For example, as the
bit rate increases, the gain in the high region is reduced and the bit rate is increased to a
predetermined level. Then, the setting is made to stop the correction of the low range gain. For
example, when the bit rate is 48 kbps or less in the MP3 system, the gain in the high region
which is insufficient for a sense of hearing is largely increased, and the gain in the low region is
also slightly raised in order to obtain the thickness of the sound. You will set the tone curve as
shown in.
Note that the reproduction means described in the claims is the reproduction mechanism 11, the
audio adjustment means is the equalizer unit 12, the compression type detection means is the
compression type detection unit 21, the bit rate detection means is the bit rate detection unit 22,
and the storage means is the memory The unit 23 and the control means correspond to the
control unit 24. Next, the operation of the sound reproducing apparatus 1A according to the
present embodiment will be described. FIG. 3 is a flowchart showing the processing operation of
the microcomputer 20 related to the sound quality adjustment value setting processing of the
sound reproduction device 1A according to the present embodiment. The sound quality
adjustment value setting process shown in FIG. 3 detects the compression type and bit rate
related to the sound compression data of the recording medium at the time of reproduction of
the recording medium recording the sound compression data, and based on the compression
type and bit rate. Is a process of setting the sound quality adjustment value of the equalizer unit
12. In FIG. 3, the control unit 24 of the microcomputer 20 detects the compression type related
to the acoustic compression data of the recording medium reproduced by the reproduction
mechanism 11 through the compression type detection unit 21 (step S 11), and based on the
detection result It is determined whether the compression type is the MP3 system (step S12).
Furthermore, when the compression type is determined to be MP3 format, the control unit 24
detects the bit rate of the recording medium through the bit rate detection unit 22 (step S13),
and the bit rate X is 48 kbps or less. It is determined whether there is any (step S14). When it is
determined in step S14 that the bit rate X is 48 kbps or less, the control unit 24 uses the tone
adjustment value of the tone curve A shown in FIG. 2A to adjust the tone of the audio signal. The
08-05-2019
4
equalizer unit 12 is set (step S15), and this processing operation is ended. If it is determined in
step S14 that the bit rate X is not 48 kbps or less, the control unit 24 determines whether the bit
rate X is 64 kbps or less (step S16). When it is determined in step S16 that the bit rate X is 64
kbps or less, the control unit 24 uses the tone adjustment value of the tone curve B shown in FIG.
2B to adjust the tone of the audio signal. It sets to the equalizer part 12 (step S17), and complete
| finishes this processing operation. When it is determined in step S16 that the bit rate X is not
64 kbps or less, the control unit 24 determines whether the bit rate X is 128 kbps or less (step
S18).
When it is determined in step S 18 that the bit rate X is 128 kbps or less, the control unit 24
uses the tone adjustment value of the tone curve C shown in FIG. 2C to adjust the tone of the
audio signal. The equalizer unit 12 is set (step S19), and this processing operation is ended.
Further, when it is determined in step S 18 that the bit rate X is not 128 kbps or less, the control
unit 24 adjusts the sound quality adjustment value of the tone curve D shown in FIG. 2D to adjust
the sound quality of the audio signal. Are set in the equalizer unit 12 (step S20), and this
processing operation is ended. When it is determined in step S12 that the compression type is
not the MP3 system, the control unit 24 determines whether the compression type is the WMA
system (step S21). When it is determined that the compression type is the WMA method, the
control unit 24 detects a bit rate through the bit rate detection unit 22 (step S22), and
determines whether this bit rate X is 48 kbps or less (step S22). Step S23). When it is determined
in step S23 that the bit rate X is 48 kbps or less, the control unit 24 sets the sound quality
adjustment value of the tone curve E in the equalizer unit 12 in order to adjust the sound quality
of the audio signal ( Step S24), this processing operation ends. When it is determined in step S24
that the bit rate X is not 48 kbps or less, the control unit 24 determines whether the bit rate X is
64 kbps or less (step S25). When it is determined in step S25 that the bit rate X is 64 kbps or
less, the control unit 24 sets the sound quality adjustment value of the tone curve F in the
equalizer unit 12 in order to adjust the sound quality of the sound signal ( Step S26), this
processing operation ends. If it is determined in step S25 that the bit rate X is not 64 kbps or
less, the control unit 24 determines whether the bit rate X is 128 kbps or less (step S27). When it
is determined in step S 27 that the bit rate X is 128 kbps or less, the control unit 24 sets the
sound quality adjustment value of the tone curve G in the equalizer unit 12 in order to adjust the
sound quality of the audio signal ( Step S28), this processing operation ends. Further, when it is
determined in step S 27 that the bit rate X is not 128 kbps or less, the control unit 24 sets the
sound quality adjustment value of the tone curve H in the equalizer unit 12 to adjust the sound
quality of the sound signal. (Step S29), this processing operation ends.
Further, when the control unit 24 determines that the compression type is not the WMA method
in step S21, for example, it determines that it is a CD-DA, and sets the sound quality adjustment
value of the flat tone curve in the equalizer unit 12 ( Step S30), this processing operation ends.
08-05-2019
5
According to the present embodiment, the sound quality adjustment value for adjusting the
sound quality of the sound signal is stored in advance for each bit rate of the compression type,
and the sound compression data of the recording medium is related to the reproduction of the
recording medium. The compression type and the bit rate are detected, the tone adjustment value
corresponding to the compression type and the bit rate is read out from the memory unit 23, and
the equalizer unit 12 is controlled based on the tone adjustment value. Because the sound quality
of the sound signal can be adjusted automatically according to the compression type and the bit
rate, the adjustment work relating to the sound quality adjustment becomes faster. In the above
embodiment, the sound quality adjustment value for adjusting the sound quality of the sound
signal for each of the four bit rates of the compression type is stored in the memory unit 23 in
advance, but the bit rate is 4 For example, if the number of stages is five or more, optimum sound
quality adjustment can be provided. In the above embodiment, the sound quality adjustment
value is stored in advance in the memory unit 23 for each bit rate of the compression type.
However, the sound quality adjustment value stored in the memory unit 23 can be The setting
may be changeable to the user-desired sound quality adjustment value according to the
operation. According to the sound reproducing apparatus of the present invention configured as
described above, the compression type and bit rate of the audio compression data recorded on
the recording medium during reproduction of the recording medium are detected, and these
compression types are detected. Since the sound quality of the sound signal reproduced by the
reproduction means is adjusted based on the and the bit rate, the user does not need to perform
the adjustment operation by the user, so the sound quality of the sound signal is automatically
adjusted according to the compression type and bit rate. Can be adjusted. According to the sound
reproducing apparatus of the present invention, the sound quality adjustment value for adjusting
the sound quality of the sound signal is stored in advance for each bit rate of the compression
type, and the compression type and bit rate are detected at the time of reproducing the recording
medium. Since the sound quality adjustment value corresponding to the compression type and
the bit rate is read out from the storage means and the sound quality adjustment means is
controlled based on the sound quality adjustment value, the adjustment work related to the
sound quality adjustment of the audio signal becomes faster.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a schematic
configuration inside a microcomputer which is a main part of a sound reproducing apparatus
showing an embodiment of the present invention. FIG. 2 is an explanatory view showing an
example of a tone curve related to the sound quality adjustment value stored in the memory unit
of the embodiment; FIG. 3 is a flowchart showing the processing operation of the microcomputer
related to the sound quality adjustment value setting processing according to the present
embodiment; FIG. 4 is a block diagram showing a schematic configuration inside a general sound
reproducing apparatus. Description of the code 1A sound reproduction device 11 reproduction
mechanism (reproduction unit) 12 equalizer unit (sound quality adjustment unit) 21 compression
type detection unit (compression type detection unit) 22 bit rate detection unit (bit rate detection
08-05-2019
6
unit) 23 memory unit (bit rate detection unit) Storage means) 24 control unit (control means)
08-05-2019
7
Документ
Категория
Без категории
Просмотров
0
Размер файла
16 Кб
Теги
jp2004012667
1/--страниц
Пожаловаться на содержимое документа