JPH04117100A - Sound field control device - Google Patents

Abstract

PURPOSE:To improve operability by controlling the sound field using data taken in corresponding to a listening position based on the discrimination result of the listning position. CONSTITUTION:A signal transmitted from a remote control operation part 7 is fetched in a photodetector 9. When it is discriminated that the sound field control mode is actuated, a data discriminating part 10 discriminates the presence or absence of the instruction for a listening position, and if the instruction is present, it discriminates the position. Then a data fetching part 11 fetches sound field control data corresponding to the instructed position from a memory 12 and transmits it to a sound control part 14 based on the discrimination result. The sound control part 14 transmits a sound control signal to a preamplifier 16 based on the data, and the sound subject to sound field control. is outputted and optimum sound field is searched. Thus, the operation of the sound field control can be simplified.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is a method for controlling the sound field formed by the sound emitted into the space from the speakers of audio equipment and the sound reflected by the walls of the room. This invention relates to a sound field control device.

(Prior Art) Traditionally, the ultimate challenge in Hi-Fj replay in audio equipment has been the reproduction of faithful original sound. However, on the playback side, wall reflections, width, and other conditions are all different, making it extremely difficult to reproduce the entire original sound field.

That is, in the original sound field, in addition to the original sound, sound information including visual information and complex reverberant sounds is obtained from the left and right ears.

Therefore, reproduction that supplements these spatial information and visual information that cannot be obtained in the reproduction sound field is required in Hi-Fi replay. Here, the sound field refers to a field formed by sound emitted into space from a speaker and sound reflected from the walls of a room.

By the way, as current sound field reproduction techniques, sound field creation methods called surround, presence stereo, and omnisound have been proposed and are being implemented. Here, the surround method is a method of reproducing sound field sensation information included in a stereo recording recorded in a sound field by, for example, shifting the phase between both L and H channels.

Additionally, as a result of psychoacoustic analysis, it is only possible to obtain a surround effect by reversing or shifting the phase of the installed signal and supplying that signal to the sub-speaker, only in cases where the effect has been recognized. be.

In addition to the main speakers, presence stereo has sub-speakers installed on the left and right sides diagonally in front of the speaker at an angle so that the sound does not directly reach the listener. This sub-speaker is intended to be supplied with a signal with a time delay of several ms to several tens of m5, and to cause the sound radiated from this sub-speaker to be reflected on the walls of the room and diffused.

FIG. 12 shows an example of speaker arrangement for information reproduction using the above-mentioned surround method.
Left and right speakers 1 and 2 are placed at the front, and left and right speakers 3 and 4 are placed at the rear. Note that 5 in the figure indicates the main body of the device.

Then, the listener controls the sound field so that the desired sound is played by operating the equalizer, balance, volume, echo reverb, surround, etc. operation buttons and knobs (not shown) on the device main body 5. There is.

(Problems to be Solved by the Invention) However, in the conventional audio equipment described above, the sound field changes when the listening position changes.

Therefore, each time the listening position changes, it is necessary to optimally control the sound field by operating each of the above-mentioned operation buttons and knobs. However, since there are many operations to be performed using operation buttons, knobs, etc., the operations become complicated.

In addition, in order to perform these operations, the listener needs to approach the device body 5 within the operable range.
You must move your listening position, which should be your goal.

Therefore, sound field control is performed at a position far from the target listening position. For this reason, each time you operate the sound field control, you have to go back and forth between the device body 5 and the target listening position to check the sound, which makes the operation complicated. Put it away.

The present invention was made in response to these circumstances, and
An object of the present invention is to provide a sound field control device that can improve operability.

(Means for Solving the Problems) In order to achieve the above object, the sound field control device of the present invention includes a listening position instructing means for instructing a listening position, and a listening position instructing means for instructing a listening position. Directed by Suningbojishi! a listening position type discriminating means for discriminating the listening position, an information storage means for storing information for sound field control corresponding to each listening position; A data acquisition means for acquiring data corresponding to a listening position from an information storage means, and a sound field control means for controlling a sound field based on the information acquired by the data acquisition means. It is characterized by

(Function) In the sound field control device of the present invention, when the listening position instruction means instructs the listening position, the listening position determining means determines the listening position. Next, when the data importing means retrieves data corresponding to the listening position from the information storage means based on the determination result by the listening position determination means, the sound field control means adjusts the sound field based on this retrieved information. control.

Therefore, unlike conventional sound field control, there is no need to operate various operation buttons, knobs, etc. to optimally control the sound field every time the listening position changes.

Furthermore, each time the sound field control is operated, there is no need to go back and forth between the device main body and the target sliding position to check the sound, which simplifies the operation.

(Example) Hereinafter, details of an example of the present invention will be described based on the drawings.

FIG. 1 shows an embodiment of the sound field control device of the present invention.

As shown in the figure, the sound field control device is equipped with a remote control operation section 7. Here, the remote control operation section 7 has, for example, a second! ! As shown in l, the light emitting part 7
It is provided with a% power key 7b, mode setting key 7c, s mode display section 7d, and positron instruction key group 7e.

The mode setting key 70 is operated when instructing the sound field mode.

The positron instruction key group 7e is operated when instructing the listening position. Here, the positilon instruction key group 7e includes instruction keys 81 to 820, for example, and these instruction keys correspond to the target listening position.

The sound field control device is also equipped with a listening position control section 8.

The listening position control section 8 includes a light receiving section 9.
, data discriminator 10, data import unit 11, memory 12
, a setting section 13, and a sound field control section 14.

The light receiving section 9 receives the optical signal from the remote control transmitting section 7.

The data discrimination section 10 discriminates data such as equalizer, reverb, volume, echo, surround, etc. based on the received information taken in by the light receiving section 9.

The data importing unit 11 imports data from the memory 12 according to the determination result by the data determining unit 10 .

The memory 12 stores data corresponding to each listening position such as equalizer, reverb, volume, echo, surround, etc.

The setting unit 13 is operated when setting the contents of each data in the memory 12.

The sound field control section 14 outputs a control signal to the preamplifier 16 based on the data fetched from the memory 12 by the data fetching section 11 .

Note that 15 in the figure indicates an information reproducing device such as a compact disc (CD) player, a tape deck, and a tuner.

Next, the operation of the sound field control device will be explained using FIG.

First, when a signal is sent from the remote control operation section 7, the signal is taken into the light receiving section 9. Next, the data discriminator 1
0, it is determined whether or not the sound field control mode is set (step 301).

Then, if the mode is not the sound field control mode, the sound field control is performed by normal manual operation (step 302).

If it is determined that you are in sound field control mode,
It is determined whether there is a listening position instruction (step 303).

If the listening position has been specified, its position is determined (step 304).

When the determination is completed, the data import unit 11 imports data for sound field control corresponding to the designated listening position from the memory 12 based on the determination result (step 305), and then transfers the data to the sound field control unit 14. Send to.

The sound field control unit 14 sends a control signal for sound field control to the preamplifier 16 based on the data (step 306).

Then, based on the control signal, sound field-controlled sound is output from the speaker (step 30).
7).

In this way, the optimum sound field is searched based on the instruction from the remote controller 7 until the power key 7b is turned off.

In this way, in this embodiment, information for sound field control corresponding to each listening position is stored in advance, and sound field control playback is performed at the target listening position by remote control operation. I made it.

Therefore, since the operation is performed by operating a switch corresponding to the listening position, the operation is simplified.

In addition, sound field control can be performed at the target and pan-facing listening position, so each time you operate the sound field control, you can check the sound by going back and forth between the device itself and the target listening position. There is no need to do this, which simplifies the operation.

Although this embodiment has been described with reference to a remote control operation section using key selection, the present invention is not limited to this example, and a digital-stick type may be used, as shown in FIG. 4, for example. In this case, it is possible to instruct the listening position more precisely than instructing the listening position by key selection.

However, in this case, it is necessary to store data corresponding to a fine grain or a fairly snipping position in the memory.

In addition, in this embodiment, a case has been described in which the settings of the contents of each data in the memory can be changed by the setting section, but this is not limited to this example. In this case, the contents of each data in the memory may be set in advance to control the sound field in a listening space that can be predicted in advance, such as a concert hall. Oh (I can.

FIG. 5 shows another embodiment in which the configuration of the sound field control device shown in FIG. 1 is changed.

As shown in the figure, the control device main body 17A of the sound field control device includes an A/D converter 17, a signal processing circuit 18, a D/A converter 19, a signal processing control section 20, a display section 21, and a selection section. 22, signal processing section 23, amplifier 24
．． 25 are provided.

The A/D converter 17 converts an analog audio signal to be reproduced into a digital audio signal.

The signal processing circuit 18 processes a signal that should correct the arrival time difference between the reproduced sounds from the left and right speakers to reach the listener, the directional frequency characteristics from the left and right speakers, and the spatial propagation loss of sound waves.

The D/A converter 19 converts the digital signal processed by the signal processing circuit 18 into an analog signal.

The signal processing control unit 20 controls the processing operation of the signal processing circuit 18.

The display unit 21 displays the listening position.

The selection section 22 is provided on the side of the control device main body 17A, and can select the listening position independently from the remote control operation 28.

The signal processing section 23 includes a remote control operation section 280 and a light emitting section 28a.
The light receiving section 23a receives signals from the light receiving section 23a, and decodes the received signals.

The remote control operation unit 28 is provided with select buttons A] to A15 corresponding to the listening position al-a15.

The amplifiers 24 and 25 are connected to the Lch speaker 26 and the Rch
Increase or decrease the level of sound to be reproduced by the speaker 27.

FIG. 6 shows details of the signal processing circuit I8, which includes a digital equalizer circuit 1 for correcting frequency directivity characteristics.
8 at 18 bt Digital delay circuit 18 for shifting the propagation time of reproduced sound c + 18 d s Level correction circuit I8e, 18 for correcting the output level of reproduced sound
f is provided. Note that these circuits have a coefficient RO
A predetermined correction is performed based on the value of M18g,
The value of the coefficient can be determined by pressing the select button A1 on the remote control operation section 28.
It corresponds to A15 and is set in advance.

The sound field control device having such a configuration performs the following operations.

First, as shown in FIG. 7, for example, as the optimum condition for 2ch stereo reproduction,
When the listener is located at the vertex of the equilateral triangle with respect to the channel speaker 27, reproduced sound having the same volume level and phase reaches both ears of the listener. Therefore, the sound image during reproduction is localized near the center of each speaker.

On the other hand, as shown in FIG.
When the position is changed to the channel speaker 27 side, the sound image is localized to the Rch speaker 27 side, where the reproduced sound arrives earlier in time. This is commonly referred to as the leading sound effect.

At this time, the volume level on the Rch speaker 27 side is usually attenuated by operating the balance control knob, and the balance between the volume levels of the left and right speakers is maintained.

However, in such a case, the overall volume level of the left and right speakers decreases, and the frequency directivity characteristics change due to the difference in the distance that sound reaches the listener.

Therefore, as shown in FIG. 9, for example, the distance L2 between the Rch speaker 27 and the listener is corrected so that the distance Ll between the Lch speaker 26 and the listener is equal.

That is, when one of the select buttons AI-A15 of the remote control operation section 28 corresponding to the listening position is selected, the digital equalizer circuits 17a, 1
7b, correction of the frequency directional characteristics is performed. This particularly corrects for the drop in the high frequency range of the frequency characteristics from the left and right speakers.

Here, at a position shifted from the center of the radiation axis of reproduced sound in a general speaker, a directional characteristic as shown in FIG. 10, for example, is obtained. In other words, as the reproduced sound moves away from the center of the radiation axis, there is a tendency for high frequencies to be attenuated in the directional characteristics of that frequency.

Also, at this time, the digital delay circuit 17 c +1
7d delays the propagation time of the reproduced sound from the speaker closer to the listener. This corrects the time difference in arrival from the left and right speakers.

Here, the digital delay circuits 17c and 17d perform operations as shown in FIG. 11, for example.

In other words, FIG. 7A shows the phase characteristics in the state shown in FIG. 7), and in this state, the phases of the reproduced sounds from the left and right speakers are aligned. 8B shows the phase characteristics in the state shown in FIG. 8. In this state, the reproduced sound waves from the Rch speaker 27 are
It is progressing against the 6th one. Therefore, by shifting the phase of the reproduced sound waves from the Rch speaker 27, as shown in FIG. 3(C), it is possible to obtain a phase matching state as shown in FIG. 2(a).

Furthermore, at this time, the level correction circuits 17e and 17f attenuate the level of the reproduced sound from the speaker closer to the listener,
The reproduction sound level of the other speaker is amplified. This corrects the spatial propagation loss of the reproduced sound.

As a result, the reproduced sound having the same volume level and phase reaches both ears of the listener, so that the sound image during reproduction can be localized near the center of each speaker as shown in FIG. 7.

In this way, in this embodiment, the time difference of the reproduced sound, the directional characteristics, and the propagation loss of the sound wave are corrected according to each listening point, so that the sound image during reproduction is localized near the center of the left and right speakers. can be done.

Therefore, it becomes possible to make the sound image clear and stable.

Although this embodiment has been described for the case of 2ch reproduction, the same effect can be obtained by performing the above-described correction even in the case of 4ch reproduction, which is limited to this example.

Further, in this embodiment, a case has been described in which the correction values for each select button on the remote control operation section are fixed, but the value is not limited to this example, and the value may be changeable. In this case, it becomes possible for each user to set a preferred reproduction state.

(Effects of the Invention) As explained above, according to the sound field control device of the present invention, unlike conventional sound field controls, each time the listening position changes, each operation button or knob is operated to control the sound field. There is no need to optimally control the

Also, each time you operate the sound field control, the
The operation is simplified because there is no need to go back and forth between the sound source and the sound source to confirm the sound.

Therefore, it is possible to improve the operability.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the sound field control device of the present invention, FIG. 2 is a plan view showing the remote control operation section thereof, and FIG. 3 is a flowchart showing the operation of the sound field control device shown in FIG. , FIG. 4 is a perspective view showing another remote control operation section when the remote control operation section shown in FIG. 2 is changed, and FIG. 5 is another embodiment when the configuration of the sound field control device shown in FIG. 1 is changed. FIG. 6 is a block diagram showing details of the signal processing circuit, FIGS. 7 to 8 are diagrams for explaining the operation of the sound field control device shown in FIG. 5, and FIG. 10 is a general diagram. Figures 11 (a) to (c) are characteristic diagrams showing the directional characteristics of the speaker at positions off the central radiation axis.
) is a diagram showing phase characteristics in the states shown in FIGS. 7 to 9, and FIG. 12 is a diagram showing an example of speaker arrangement in information reproduction using a conventional surround system. 7... Remote control operation section, 7a... Light emitting section, 7b...
・Power key, 7c...Mode setting key, 7d...Mode display section, 7e...Bojishi type instruction key group, 5l-
820... Instruction key, 8... Listening position control section, 9... Light receiving section, 10... Data discrimination section, 11... Data import section, 12... Memory,
I3...setting section, 14...sound field control section, 1
8... Signal processing circuit, 18a, 18b... Digital equalizer circuit, 18c, 18d... Digital delay circuit, 18e, 18f... Level correction circuit, 1
8g...Coefficient ROM120...Signal processing control unit. Patent applicant: Representative of Pioneer Co., Ltd.
Patent Attorney: Atsushi Jundo, Patent Attorney: Wataru Ogura

Claims (1)

[Claims] (1) Listening position indicating means for indicating a listening position, listening position discriminating means for discriminating the listening position instructed by the listening position indicating means, and information for sound field control corresponding to each listening position is stored. an information storage means, a data acquisition means for acquiring data corresponding to a listening position from the information storage means based on the determination result by the listening position determination means, and a data acquisition means based on the information acquired by the data acquisition means. and a sound field control means for controlling a sound field.