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JP2002369299

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DESCRIPTION JP2002369299
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio reproducing apparatus and a DVD player, and more particularly to a DVD with an SACD
reproducing function capable of reproducing both a DVD (digital versatile disc) and an SACD
(super audio CD). It relates to the player, in particular to the speaker settings.
[0002]
[0002] Conventionally, DVD players are widely used as multi-channel music players.
[0003]
FIG. 6 shows an example of a speaker arrangement of a DVD player conventionally performed in
a general home.
In FIG. 6, large front speakers L and R are installed on the left and right front of the listening
position A of the viewer, and large rear speakers Ls and Rs are installed on the left and right rear,
respectively. A center speaker C is installed at the front center.
[0004]
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1
The speakers L, R, Ls, Rs are large speakers that can output wide band (full band) audio, but the
center speaker C is a small speaker that can output narrow band (medium to high band) audio is
there. The reason why the center speaker C is small is mainly because a TV (television receiver) is
disposed at the front center position of the listening position A of the viewer in the home, and a
large one such as the left and right speakers can not be used. . Generally, the large speakers L, R,
Ls, Rs can reproduce the entire band of the signal of the corresponding channel, but the small
center speaker C can not reproduce the low range of the center channel.
[0005]
In order for the viewer to fully reproduce the music data recorded on the DVD and enjoy the
music, the DVD player causes each speaker to properly handle the range in the given speaker
environment, and the entire range is completely output. So-called speaker settings have to be
done.
[0006]
To that end, the DVD player has the function of allowing the viewer to manually input and
display the speaker environment.
[0007]
FIG. 7 shows an example of the display of the speaker environment as shown in FIG. 7 provided
in the DVD player.
This display shows the speaker environment on the television screen by connecting the video
output terminal of the DVD player to the external input terminal of the television.
[0008]
In FIG. 7, the front speakers (L and R) are large (speakers for full band reproduction) and small
(speakers for medium and high band reproduction), and the center speakers are large, small and
none. The speakers (rear speakers Ls, Rs) can be selected as large, small, or none, and the
subwoofers can be selected as either yes or no.
[0009]
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When the speaker environment is input as described above, in the DVD player, the low frequency
components of the center channel are equally distributed to the left and right front speakers L
and R so that the low frequency components are not lost as a whole. It is designed to carry out
signal processing for setting.
Therefore, there is no problem at all when enjoying a movie with a DVD player.
[0010]
Recently, a DVD player with SACD (super audio CD) playback function has been developed.
The SACD is similar to the DVD in physical structure for reproduction, and the reproduction
method is also the same, so that the SACD can also be reproduced by the DVD player. However,
when viewing an SACD with a DVD player with an SACD reproduction function, the above
conventional speaker setting is often inconvenient for the following reasons.
[0011]
SACD has been developed as a medium that realizes higher quality music playback than CD
(compact disc). The SACD has the same disc diameter (12 cm), disc thickness (1.2 mm), singlesided reproduction as the CD, but the encoding method is different. That is, the sampling
frequency is 44.1 KHz for the CD, the number of quantization bits is 16 bits, and the linear PCM
method is used for the encoding method, while the sampling frequency for the SACD is 64 times
that of the CD. 2.8224 MHz, the number of quantization bits is one. That is, as a coding method, a
DSD (Direct Stream Digital) method is adopted in which a wide band is directly converted into 1bit digital data using a ΔΣ modulation circuit. Therefore, the amount of data is four times that
of the CD, so the quantization noise is smaller and the sound quality is higher.
[0012]
However, the difference between SACD and DVD is that the reproduction frequency range is DC
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to 100 KHz or more. In the case of Dolby Digital 5.1ch (multichannel) of DVD, the upper limit
frequency that can be reproduced is 20 KHz (reproduction frequency range is DC to 20 KHz),
whereas SACD has a frequency band (reproduction frequency range of 100 KHz) However, this is
a major reason for being inconvenient in the above-mentioned speaker setting when reproducing
an SACD with a DVD player with an SACD reproducing function.
[0013]
Of course, there is no problem if the center speaker is a small speaker that can reproduce even at
high frequencies up to 100 KHz. However, DVD-compatible center speakers are not suitable for
SACDs because they have only playback capability up to about 20 KHz.
[0014]
Therefore, in order to enjoy the SACD with the DVD player with the SACD reproduction function,
it is better to equally distribute the signals of the center channel to the left and right front
speakers L and R with no center speaker.
[0015]
However, for users using a DVD player with an SACD playback function, changing the speaker
settings one by one each time the type of disc to be viewed is different is very troublesome in
actual use. There's a problem.
[0016]
According to the present invention, in order to eliminate the inconvenience of the user, different
speaker settings can be set during SACD playback and DVD playback, and when the type of disc
to be played back is identified, the identified disc type is identified. It has a subject in providing a
DVD player which makes it a speaker setting.
[0017]
SUMMARY OF THE INVENTION In order to solve the above problems, an audio reproducing
apparatus and a DVD player according to the present invention have the following construction.
[0018]
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(1) Audio reproduction comprising reproduction means capable of reproducing compact discs
different in at least two kinds of reproduction frequency bands, and speaker setting means for
setting a speaker configuration according to the type of compact disc to be reproduced
apparatus.
(2) The audio reproducing apparatus according to (1), wherein the compact discs having
different reproduction frequency bands are a compact disc having a reproduction frequency
band of 20 kHz and a compact disc having a reproduction frequency band of 100 kHz.
(3) The audio reproduction device according to (1), wherein the speaker setting unit performs
speaker setting by selecting a preset speaker configuration.
(4) The preset speaker configuration is configured such that when a compact disc with a
playback frequency band of 100 kHz is played back, the audio signal to the center speaker
composed of mid-to-high band playback speakers is composed of all-band playback speakers The
audio playback device according to (3), wherein the audio playback device is set to be distributed
to the front speakers.
(5) The speaker setting means outputs a predetermined audio signal from the speaker, detects
the level of the audio signal output from the speaker, and determines the presence and the type
of the speaker, and the determined speaker The audio reproduction apparatus according to (1),
wherein the speaker setting is performed in combination.
[0019]
(6) Reproducing means capable of reproducing both a DVD (digital versatile disc) having a
reproduction frequency band of 20 kHz and a SACD (super audio CD) having a reproduction
frequency band of 100 kHz; and reproducing the SACD And a speaker setting unit capable of
setting different speaker settings when reproducing the DVD. (7) The speaker setting unit is
configured to distribute an audio signal to be output to the center speaker configured by the
medium and high band playback speakers to the front speaker configured by the full band
playback speaker when playing back the SACD. The DVD player described in (6). (8) The DVD
player according to (6), wherein the speaker setting unit sets a speaker by selecting a preset
speaker configuration. (9) The speaker setting means outputs a predetermined audio signal from
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the speaker, detects the level of the audio signal output from the speaker, and determines the
presence and the type of the speaker, and the determined speaker (6) the DVD player according
to (6) characterized in that a speaker setting is performed in combination.
[0020]
As described above, in the audio playback device and the DVD player capable of playing different
types of compact discs (DVD and SACD), the speaker environment compatible with the compact
disc can be obtained by setting the speaker settings suitable for the compact disc to be played
back. It can be easily realized.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an audio reproduction
apparatus and a DVD player according to the present invention will be described in detail with
reference to the drawings.
[0022]
As shown in FIG. 1, the DVD player embodying the audio reproducing apparatus includes a
reproducing unit 40 for reproducing a compact disc, an audio output control unit 50 for
controlling an audio signal, and a speaker unit 60 for outputting an audio signal. The display unit
70 configured to display an image or the like when the compact disc is reproduced is a television
receiver or the like.
The configuration related to video is omitted, and the display unit 70 may differ depending on
the DVD player, and may be combined with the player or may be separately configured.
[0023]
The playback unit 40 is configured to include an SACD playback unit 41 that plays back an SACD,
a DVD playback unit 42 that plays a DVD, and a CD playback unit 43 that plays a CD. , And may
be composed of the SACD reproducing unit 41 and the DVD reproducing unit 42.
[0024]
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The audio output control unit 50 includes an audio output unit 51 that outputs an audio signal to
the speaker unit 60, and a speaker setting unit 52 that sets a speaker.
The speaker setting unit 52 is configured to be able to realize a speaker environment compatible
with SACD by setting different speaker settings for the SACD and the DVD, respectively, which
will be described later.
[0025]
In the embodiment, the speaker unit 60 is located in front of a listening position (not shown) and
includes a front speaker 61 including a pair of speakers on the left and right, and in front of the
listening position, such as a television receiver. It consists of a center speaker 62 disposed at the
position of the display unit 70, a surround speaker 63 at the rear position with respect to the
listening position and consisting of a pair of left and right speakers, and a subwoofer 64 that
produces a deep bass.
In addition, the front speaker 61 and the center speaker 62 are required at least not all of them
are aligned.
[0026]
The speaker setting in the speaker setting unit 52 is configured to select a configuration in which
the speaker setting is made in advance according to the type of the compact disc.
[0027]
For example, as shown in FIG. 2, in the case of SACD reproduction, “2” is selected from the
speaker settings “1” or “2”, and in the case of DVD reproduction, “s” among the speaker
settings “1” or “2” 1 is selected, and in the case of CD reproduction, a screen state is shown
in which “2” is selected among the speaker settings “1” or “2”.
[0028]
FIG. 3A is an example showing the speaker configuration of the speaker setting “1”, and FIG.
3B is an example showing the speaker configuration of the speaker setting “2”.
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In FIG. 3 (a) and FIG. 3 (b), the characters enclosed by squares indicate the speaker setting status.
[0029]
That is, the speaker setting “1” in FIG. 3A indicates the speaker setting in the case of DVD, and
the front speaker 61 and the surround (rear) speaker 63 are both large speakers, and the center
speaker 62 is a small speaker. And the subwoofer 64 has become a speaker setting adapted to
the present speaker environment of no.
[0030]
On the other hand, in the case of the SACD of FIG. 3B, the front speaker 61 and the surround
(rear) speaker 63 are both large speakers, the center speaker 62 is absent, and the subwoofer 64
is absent.
[0031]
As described above, if the center speaker 62 is absent and the front speaker 61 is set to be large,
an audio signal output from the center speaker 62 is distributed to the front speaker 61 and
output.
[0032]
FIG. 4 shows an embodiment of a circuit for automatically determining the presence or absence
of the speaker and the size as the previous stage of setting the speaker in the speaker setting unit
52.
[0033]
In FIG. 4, the output terminals of the 1 kHz sine wave generator 1 and the 100 Hz sine wave
generator 2 are connected to the input terminals 3 a and 3 b of the changeover switch 3
respectively.
[0034]
The changeover switch 3 is controlled by a control signal 7a from a microcomputer 7 described
later to switch and connect the input terminal 3a or 3b to the output terminal 3c.
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[0035]
The output terminal 3 c of the changeover switch 3 is connected to the input terminal 4 a of the
selection switch 4.
The selection switch 4 is controlled by a control signal 7b from the microcomputer 7 to connect
the input terminal 4a to one of the output terminals 4b, 4c, 4d, 4e and 4g.
[0036]
The output terminals 4b to 4g of the selection switch 4 are respectively connected to one input
terminals of the changeover switches 5L to 5sub (each indicated by a) in a one-to-one
correspondence.
Main lines (reproduction output) of corresponding channels are connected to the other input
terminals of the changeover switches 5L to 5sub in a one-to-one correspondence.
[0037]
The output terminals of the changeover switches 5L to 5sub are connected to the line output
terminals 6L to 6sub of the speakers.
The changeover switches 5L to 5sub operate under the control of control signals from the
microcomputer 7, and have the function of switching the line outputs 6L to 6sub to either the
signal from the main line or the signal from the selection switch 4.
[0038]
Each of the line output terminals 6L to 6sub is connected to a corresponding speaker (the above
L, R, etc.) via an amplifier (not shown).
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For example, in the case of L channel, the L channel component appears on the main line during
normal DVD playback, so by turning the switch 5L to the b side, the L channel playback signal
from the line output terminal 6L Is output.
As a result, the sound of the L channel is output from the speaker L.
[0039]
The circuit shown in FIG. 4 that automatically determines the presence or absence of the speaker
includes the microcomputer 7, the amplifier (amplifier) 8, the 1 KHz band pass filter (BPF) 9, the
100 Hz low pass filter (LPF) 10, and the level detector 11 , And a discrimination circuit including
the microphone 12 is provided.
[0040]
The microphone 12 is placed at the listening position A (see FIG. 6 of the prior art).
The output of the microphone 12 is connected to the input terminal of the amplifier 8.
The output terminal of the amplifier 8 is commonly connected to the input terminals of the 1
KHz BPF 9 and the 100 Hz LPF 10.
[0041]
The output terminals of the 1 KHz BPF 9 and 100 Hz LPF 10 are connected to the input
terminals 11 a and 11 b of the level detector 11, respectively.
The output terminal of the level detector 11 is connected to the input terminal of the
microcomputer 7.
09-05-2019
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[0042]
The circuit configured to automatically determine the presence / absence and the size of the
speaker configured as described above operates as follows.
[0043]
In both the case of determining the presence or absence of the speaker and the case of
determining the size of the speaker, the changeover switches 5L to 5sub are turned to the input
terminal a side by the control signal 7c from the microcomputer 7.
Thereby, the output of the speaker becomes the output from the 1 KHz sine wave generator 1 or
the 100 Hz sine wave generator 2.
[0044]
When determining the presence or absence of the speaker, the microcomputer 7 controls the
output of the changeover switch 3 to be connected to the output 3a of the 1 KHz sine wave
generator 1 by the control signal 7a. Next, the microcomputer 7 sequentially switches the output
of the selection switch 4 from 4b to 4c to 4g. Thereby, the sound of 1 KHz sine wave is generated
sequentially from each speaker.
[0045]
The sound of each speaker is picked up by the microphone 12 and is input to the input terminal
11 a of the level detector 11 through the amplifier 8 and the 1 KHz BPF 9. The level detector 11
sends a "speaker available" signal to the microcomputer 7 if the input signal at the input terminal
11a is equal to or higher than a predetermined level. When the microcomputer 7 receives this
"speaker present" signal, it determines that the speaker corresponding to the position of the
selection switch 4 is "present".
[0046]
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11
In order to determine the size of the speaker, the output of the changeover switch 3 is controlled
to be connected to the output 3 b of the 100 Hz sine wave generator 2. Next, the microcomputer
7 sequentially switches the output of the selection switch 4 from 4b to 4c to 4g. Thereby, the
sound of a 100 Hz sine wave is sequentially generated from each speaker.
[0047]
The sound of each speaker is picked up by the microphone 12 and is input to the input terminal
11 b of the level detector 11 through the amplifier 8 and the 100 Hz LPF 10. The level detector
11 sends a "small speaker" signal to the microcomputer 7 if the input signal at the input terminal
11b is lower than a predetermined level.
[0048]
When the microcomputer 7 receives this "small speaker" signal, it determines that the speaker
corresponding to the position of the selection switch 4 is "small". The microcomputer 7 sends the
determination result of the presence or absence and the magnitude of the speaker as display data
to the DVD body to display it on the TV screen.
[0049]
Next, an automatic speaker setting circuit in the speaker setting unit will be described with
reference to FIG.
[0050]
Only the L channel, the C channel, and the R channel are shown in FIG. 5 to simplify the
description.
[0051]
The switch group 5 of the automatic speaker setting circuit is used in common with the circuit
shown in FIG. 4 that automatically determines the presence and the size of the speaker.
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12
When the switches 5L to 5sub of the switch group 5 are turned to the b side, this automatic
speaker setting circuit functions.
[0052]
In FIG. 5, the main line Lch is an output line from the L channel decoder in the DVD player.
The main line Cch is an output line from the center channel decoder in the DVD player. The main
line Rch is an output line from the R channel decoder in the DVD player.
[0053]
Main line Lch is connected to one input terminal of adder 20. The output terminal of the adder
20 is connected to the input terminal of a 100 Hz high pass filter (HPF) 21 and to one input
terminal 22 a of the changeover switch 22. The other input terminal 22 b of the changeover
switch 22 is connected to the output terminal of the 100 Hz HPF 21. The output terminal 22 c of
the changeover switch 22 is connected to one input terminal of the adder 23.
[0054]
The other input terminal of the adder 23 is connected to one terminal 27 a of the on / off switch
27. The output terminal of the adder 23 is connected to the input terminal b of the changeover
switch 5L.
[0055]
The main line C is connected to the input terminal of the 100 Hz HPF 24 and one input terminal
25 a of the changeover switch 25. The output terminal of the 100 Hz HPF 24 is connected to the
other input terminal 25 b of the changeover switch 25.
[0056]
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The output terminal 25 c of the changeover switch 25 is connected to the input terminal of the
attenuator 26 having the function of attenuating the input signal by 4.5 dB, the b-side input
terminal of the changeover switch 5 C, and the output terminal of the attenuator 26 . The output
terminal of the attenuator 26 is also connected to the other terminal 27 b of the on / off switch
27 and one terminal 28 a of the on / off switch 28.
[0057]
The main line C is also connected to the input terminal of a 100 Hz low pass filter (LPF) 29. The
output terminal of the 100 Hz LPF 29 is connected to the input terminal of an attenuator 30
having a 4.5 dB attenuation function. The output terminal of the attenuator 30 is connected to
one terminal 31 a of the on / off switch 31 and one terminal 32 a of the on / off switch 32.
[0058]
The main line Rch is connected to one input terminal of the adder 33. The other input terminal of
the adder 33 is connected to the terminal 32 b of the on / off switch 32. The output terminal of
the adder 33 is connected to the input terminal of the 100 Hz HPF 34 and to one input terminal
35 a of the changeover switch 35. The other input terminal 35 b of the changeover switch 35 is
connected to the output terminal of the 100 Hz HPF 34.
[0059]
An output terminal 35 c of the changeover switch 35 is connected to one input terminal of the
adder 36. The other input terminal of the adder 36 is connected to the terminal 28 b of the on /
off switch 28. The output terminal of the adder 36 is connected to the b-side input terminal of
the changeover switch 5R.
[0060]
The switches 22, 25, 27, 28, 31, 32 receive control signals from the microcomputer 7 and
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perform on / off operations or switching operations. When the microcomputer 7 receives a disc
identification signal from the DVD player main body, it determines a combination of switch
control signals corresponding to the type of disc. The combination of these switch control signals
determines the speaker setting mode. The microcomputer 7 sends a display signal representing
this speaker setting mode to the DVD body to display it on the TV screen.
[0061]
The automatic speaker setting circuit having such a configuration operates as follows. If the
microcomputer 7 determines that the speakers L, R, and C are all "large", the on / off switches
27, 28, 31, and 32 are kept open and the changeover switches 22, 25, and 35 are turned to the a
side. At this time, the audio signals of the entire band from the main lines Lch, Rch, and C are
output from the speakers L, C, and R as they are.
[0062]
When the front speakers L and R are determined to be "small", the microcomputer 7 tilts the
changeover switches 22 and 35 toward the respective 22b and 35b and inserts the 100 Hz HPFs
21 and 34 to output the low frequency signal 6L, Do not leave the 6R.
[0063]
When the front speakers L and R are "large" and the center speaker C is determined to be "small",
the microcomputer 7 tilts the switch 25 to the 25b side and inserts 100 Hz HPF 24 to lower the
C channel output 6C. At the same time as closing the on / off switches 31 and 32 so as not to
output the area signal.
As a result, the low-pass signal component included in the main line C passes through the 100 Hz
LPF 29 and is further attenuated by 4.5 dB by the attenuator 30, and then passes through the on
/ off switch 31 to the adder 20 via the on / off switch 32. Are added to the adders 33
respectively. As described above, when the center speaker C is small, the low frequency
component of the signal of the C channel is distributed to the signals of the main lines Lch and
Rch.
[0064]
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When the front speakers L and R are "large" and the center speaker C is determined to be
"absent", the microcomputer 7 tilts the changeover switch 25 to the side 25a and closes the on /
off switches 27 and 28 to turn on / off switches 31 and 32. open. As a result, the signal from the
main line C is attenuated by 4.5 dB by the attenuator 26 and then added to the adders 23 and 36
through the on / off switches 27 and 28, respectively. As described above, when there is no
center speaker C, the signal of the C channel is distributed to the signals of the main lines Lch
and Rch.
[0065]
In this way, when reproducing the SACD, the sound signal output to the center speaker 62 is
distributed to the front speaker 61, so that the sound output of the range that can not be handled
by the center speaker 62 is output by the front speaker 61. Since the setting can be performed
automatically, an extremely easy-to-use and easy-to-use audio reproducing apparatus and DVD
player can be realized.
[0066]
As described above, the speaker settings of the audio reproducing apparatus and the DVD player
according to the present invention are different settings for reproducing the DVD and for
reproducing the SACD, and are adapted to the respective settings. As a result, it is possible to
eliminate the troublesomeness of the speaker setting as in the prior art and to output an audio
signal adapted to the speaker environment in either case of SACD and DVD.
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