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JPH05336600

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH05336600
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
plurality of sound field controls, and more particularly to a high frequency / low frequency
reproduction control method of sound field creation control.
[0002]
2. Description of the Related Art Conventionally, when creating a sound field with a sound field
creating device 60 as shown in the block diagram of FIG. 6, the sound field control unit 62
responds to the output of a sound reproducing device 61 such as a CD player. In order to create
a desired sound field, addition of reflection sound and reverberation sound by DSP (Digital Signal
Processor) and control of frequency characteristics with an equalizer (filter) are mainly
performed. In this case, the frequency characteristics differ greatly depending on each sound
field mode. However, in the conventional method, the characteristics of the bass (BASS; low
frequency) and treble (high frequency) are constant (one type) (in FIG. 7, the conventional
(general) high frequency and low frequency Maximum and minimum characteristics are shown).
[0003]
Therefore, when the high frequency / low frequency control is performed by the bus treble
control 63, the characteristics of the high frequency / low frequency are constant as described
above. As a result, for example, When the frequency characteristic is not flat or boosted in the
sound field control unit 62, the input sensitivity of the amplifier 64 and the speaker 65 in the
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latter stage can not be in time, and the bass is raised in the sound field mode where the bass
range is amplified. The input sensitivity amplifier may distort the signal. When treble is raised in
the sound field mode where the high range is amplified, the conventional input sensitivity
amplifier may distort the signal. The bass treble of the conventional characteristic in the sound
field mode There is a disadvantage that raising the value may deteriorate the atmosphere of the
created sound field.
[0004]
On the other hand, according to knowledge, when sound field control is performed on a source
having flat frequency characteristics, the frequency characteristics may not be flat due to
addition of reflected sound or reverberation, an equalizer, and the like.
For example, when the frequency characteristics as shown in FIG. 8 are obtained as a result of
certain sound field control, if the bus is maximized (for example, 70 Hz, +10 dB), the input
sensitivity of the amplifier 64 at the subsequent stage of the sound control unit 62 is obtained.
To get it right, you have to lower the gain. Usually, the sound pressure difference in the sense of
hearing must be small between the cases where various types of acoustic control are performed
and the cases where no processing (uncontrolled), but the SN ratio in the mode in which the
frequency characteristic is not amplified is It will be disadvantageous compared to the case of not
lowering it. Moreover, when the bass region is boosted in the sound field mode, it is not
necessary to secure the conventional gain (in this case, +10 dB in this case) by the bus (BASS)
(because the atmosphere of the set sound field is disturbed) ). In addition, changing the center
frequency Q of the bus (BASS) to no sound field control may be advantageous to both the input
sensitivity and the listener's subjectivity, such as the amplifier 64 of the next stage. FIG. 9 shows
an example of the sound field mode and the frequency characteristics of bass treble.
[0005]
The present invention has been made in view of the above-mentioned drawbacks and findings,
and it is intended to make the high frequency and low frequency characteristics correspond to
the sound field mode and perform the high frequency and low frequency control optimum for
each sound field control. It is an object of the present invention to provide a high frequency / low
frequency reproduction control method of sound field creation control that can be performed.
[0006]
SUMMARY OF THE INVENTION In order to achieve the above object, the high frequency / low
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frequency reproduction control method of sound field creation control of the present invention
comprises a predetermined sound field reproduction mode for an acoustic signal from an
acoustic signal source. Control of sound field creation control according to the sound field
creation control output and control of constant high frequency and low frequency characteristics
and output as sound reproduction signal From the sound field reproduction mode detection step
for detecting the sound field reproduction mode and the high band / low band characteristic
control step for controlling the high band / low band characteristics according to the sound field
reproduction mode based on the coefficient data. And the sound field reproduction mode
detection step determines the control state of the high band and low band characteristics for
each of the detected sound field reproduction modes, and the control judgment step of the first
high band and low band characteristics to obtain a judgment result When the determination
result is in the first state, according to the sound field reproduction mode And a first coefficient
setting step of selecting and setting the coefficient data that determines the control of the high
frequency and low frequency characteristics, and automatically controlling the high frequency
and low frequency characteristics based on the coefficient data. It is characterized by doing.
[0007]
Furthermore, in the high frequency / low frequency reproduction control method of the sound
field creation control, when the sound field reproduction mode detection step does not detect the
sound field reproduction mode, the control state of the high frequency / low frequency
characteristic is determined. The control determination step of the second high band / low band
characteristic for obtaining the judgment result, and the coefficient determining the control of
the high band / low band characteristic when not in the sound field reproduction mode when the
judgment result is in the first state It is desirable to automatically control the high frequency and
low frequency characteristics based on the coefficient data, and the second coefficient setting
step of selecting and setting data.
[0008]
According to the above configuration, the high frequency / low frequency reproduction control
method of sound field creation control of the present invention detects the sound field
reproduction mode by the sound field reproduction mode detection step, and the high frequency
/ low frequency characteristic control step Control of the high frequency and low frequency
characteristics according to the sound field reproduction mode is performed based on the
coefficient data.
Then, the sound field reproduction mode detection step determines the control state of the high
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band and low band characteristics by the control determination step of the first high band and
low band characteristics for each of the detected sound field reproduction modes, and the
judgment result is In the first state, the first coefficient setting step selects and sets the
coefficient data that determines the control of the high frequency and low frequency
characteristics according to the sound field reproduction mode, and automatically based on the
coefficient data. Perform high frequency and low frequency characteristic control.
[0009]
In the high frequency / low frequency reproduction control method of sound field creation
control described above, when the sound field reproduction mode detecting step does not detect
the sound field reproduction mode, the control of the second high frequency / low frequency
characteristic is further performed. The control state of the high frequency and low frequency
characteristics is determined in the determination step and the determination result is obtained,
and when the determination result is the first state, the high frequency and low range when the
sound field reproduction mode is not performed by the second coefficient setting step It is
possible to select and set coefficient data that determines the control of area characteristics.
[0010]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a basic block diagram of a
high frequency / low frequency reproduction control method of sound field creation control
according to the present invention.
In FIG. 1, step 1 is a sound field reproduction mode detection step of detecting a sound field
reproduction mode, and step 2 is a high frequency / low frequency band for each mode when the
sound field reproduction mode detection step 1 detects a sound field reproduction mode. Control
determination step of the first high band / low band characteristic determining the control state
of the band characteristic and obtaining the determination result, Step 3 is the determination
result of the control determination step 2 of the second high band / low band characteristic
being the first And selecting the coefficient data that determines the control of the high
frequency and low frequency characteristics according to the sound field reproduction mode, and
step 4 is a first determination setting step of setting the selected coefficient. Step 8 is a high band
/ low band characteristic control step 8 for controlling the high band and low band
characteristics according to the sound field reproduction mode based on the coefficient data.
[0011]
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FIG. 2 is a block diagram of a preferred embodiment of the high band / low band reproduction
control method of the present invention based on the block diagram of FIG.
In FIG. 2, steps 1 to 4 and step 8 are the same as in FIG. 1, and step 5 controls the high frequency
/ low frequency characteristic control state when the sound field reproduction mode is not
detected in step 1 of FIG. The control determination step of the second high band / low band
characteristic for determining and obtaining the determination result, step 6 is a sound when the
determination result of the second high band / low band characteristic control determination
step 5 is in the first state A coefficient selection step of selecting coefficient data that determines
control of high frequency / low frequency characteristics when not in the field reproduction
mode, step 7 is a second coefficient setting step of setting the selected coefficient.
[0012]
FIG. 3 is a block diagram showing a configuration example of a sound field creation apparatus to
which the high band / low band reproduction control method of the present invention is applied.
In FIG. 3, 30 is a sound field creating device, 31 is a sound reproducing device as an acoustic
signal source such as a CD player, 32 is an A / D converter, and 33 is a DSP for sound field
control and high frequency / low frequency control. (Digital Signal Processor), 34 is a CPU as a
control unit that controls the operation of the DSP 33 and executes the high frequency / low
frequency reproduction control method of sound field creation control of the present invention,
35 is high frequency / low frequency of the present invention A ROM for storing a reproduction
control method, predetermined low band control coefficients and high band control coefficients,
35 is a D / A converter, 36 is an amplifier, and 37 is a speaker.
[0013]
FIG. 4 is an explanatory view of the operation of the DSP 33 of FIG. 3. FIG. 4A shows a filter (for
example, IIR) as shown in FIG. 4B that controls the high frequency band, the control of the
frequency characteristics in the equalizer (filter), the reflected sound and the reverberation
sound. A sound field creation unit 43 is shown that creates a sound field by the addition of the
sound. In this embodiment, as described later, it is determined whether or not the sound signal
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controlled by the low band control unit 41 and the high band control unit 42 passes through the
sound field creation unit 43 depending on the presence or absence of the sound field
reproduction mode. The control signal is sent together with the coefficient data to control, but in
FIG. 4A, it is illustrated as a switch of S1 and S2 for explanation.
[0014]
FIG. 5 is a flow chart showing the operation of one embodiment of the high frequency / low
frequency reproduction control method of sound field creation control of the present invention.
Hereinafter, high frequency / low frequency reproduction according to the present invention will
be described by taking a sound field creating apparatus having two types of sound field modes
(mode 1 and mode 2) and sound field mode off according to FIGS. 3, 4 and 5. The operation of
the control unit 34 in the control method will be described. When the sound field creating device
30 is activated, initial setting for operating each device and the present high and low range
reproduction control method is performed first, and an acoustic signal from the sound
reproduction device 31 such as a CD player is DSP 33 The signal is controlled as follows, and is
output from the speaker 37 through the D / A converter 35 and the amplifier 36 in the
subsequent stage through the sound field generation unit 43.
[0015]
[Step 1-1] The sound field reproduction mode flag of the input sound signal is tested, and when
sound field reproduction mode 1 is detected, Step 2-1 is executed. When the sound field
reproduction mode 1 is not detected, step 1-2 is executed.
[0016]
[Step 2-1-4] It is determined whether the low band control unit 41 is on (step 2-1). If the low
band control unit 41 is on, the low band coefficient of the sound field mode 1 is determined. It is
selected from the ROM 35 (step 3-1) and sent to a00 to a02 (FIG. 4B) of the low band control
unit 41 of the DSP 33 (step 4-1), and the step 8 is executed. If the low band control unit 41 is not
on, step 2-2 is executed.
[0017]
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[Step 2-2 to 4-2] It is determined whether or not the high frequency control unit 2 is on (step 22), and if the high frequency control unit 42 is on, the high frequency coefficient of the sound
field mode 1 It is selected from the ROM 35 (step 3-2), sent to FX, GX, and HX (FIG. 4C) of the
high frequency control unit 42 of the DSP 33 (step 4-2), and the step 8 is executed. When the
high frequency control unit 42 is not turned on, the process returns to step 1-1 to execute
detection of the sound field mode of the next acoustic signal.
[0018]
[Step 1-2] The sound field reproduction mode of the input sound signal is tested, and when the
sound field reproduction mode 2 is detected, Step 2-3 is executed. When the sound field
reproduction mode 2 is not detected, step 5-1 is executed.
[0019]
[Step 2-3 to 4-3] It is determined whether the low band control unit 41 is on (step 2-3). If the low
band control unit 41 is on, the low band coefficient of the sound field mode 2 is set. It is selected
from the ROM 35 (step 3-3), and sent to a00 to a02 of the low band control unit 41 of the DSP
33 (step 4-3), and the step 8 is executed. When the low band control unit 41 is not on, step 2-4 is
executed.
[0020]
[Steps 2-4 to 4-4] It is determined whether or not the high frequency control unit 42 is on (step
2-2). If the high frequency control unit 42 is on, the high frequency coefficient of the sound field
mode 2 is selected. It is selected from the ROM 35 (step 3-2), sent to FX, GX, and HX of the high
frequency control unit 42 of the DSP 33 (step 4-4), and the step 8 is executed. When the high
frequency control unit 42 is not turned on, the process returns to step 1-1 to execute detection
of the sound field mode of the next acoustic signal.
[0021]
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[Step 5-1 to 6-2] It is determined whether the low band control unit 41 is on (Step 5-1). If the low
band control unit 41 is on, the low band coefficient of the sound field mode off is selected. It is
selected from the ROM 35 (step 6-1) and sent to a00 to a02 of the low band control unit 41 of
the DSP 33 (step 6-2), and the step 8 is executed. When the low band control unit 41 is not on,
step 5-2 is executed.
[0022]
[Steps 5-2 to 7-2] It is determined whether or not the high frequency control unit 42 is on (step
5-2). If the high frequency control unit 42 is on, the low frequency coefficient of the sound field
mode off is selected. It is selected from the ROM 35 (step 7-1), sent to FX, GX, and HX of the high
frequency control unit 42 of the DSP 33 (step 7-2), and the step 8 is executed. When the high
frequency control unit 42 is not turned on, the process returns to step 1-1 to execute detection
of the sound field mode of the next acoustic signal.
[0023]
[Step 8] Control of the high frequency and low frequency characteristics according to the sound
field reproduction mode is performed based on the sent coefficient. As a result, it is possible to
give different characteristics to each sound field mode and each of the high band and low band
(tone control) of the sound field mode OFF.
[0024]
In the present embodiment, the sound field creation device having two types of sound field
modes and sound field modes and off is taken as an example, but the sound field modes are not
limited to this, and a large number of modes may be used according to the number of modes.
Steps 2-2 and 2-2, and Steps 2-3 and 2-4 may be repeated in the same manner as in Steps 2-2
and 2-2 and Steps 2-3 and 2-4, and corresponding to the number of modes. The coefficients to be
calculated may be stored in the ROM 35. Therefore, even if the frequency characteristics are
different depending on each sound field mode, the low band and high band frequency
characteristics can be controlled according to the mode, and the high band and low band
optimum for each sound field control can be performed.
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[0025]
In addition, there are the following advantages in performing high frequency / low frequency
control of different frequency characteristics for each sound field mode. (1) In the case of the
sound field mode in which the low range is boosted The low range control unit performs the
sound field control because the gain in the boost direction in the low range is compressed as
compared with the case without sound field control. It is possible to output a signal suitable for
the input sensitivity of an amplifier or the like located after the unit. Also, in the sense of hearing,
the bass range is boosted enough. (2) In the case of a sound field mode in which the high range is
boosted The gain in the boost direction in the high region can not be boosted as in the prior art
by compressing the gain in the boost direction compared to the case without sound field control
It is possible to output a signal suitable for the input sensitivity of an amplifier or the like located
after the unit. In addition, the high range is also boosted sufficiently for hearing.
[0026]
As described above, according to the high frequency / low frequency reproduction control
method of sound field creation control of the present invention, even when the frequency
characteristic is not flat or boosted in sound field control, It is possible to output a signal that
matches the input sensitivity of the subsequent amplifier and speaker.
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