JP2951511B2 - Sound equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acoustic device for adjusting a sound field created by using a digital signal processor by an external operation.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram showing a conventional audio apparatus. In FIG. 5, reference numeral 1 denotes an analog / digital converter for converting an analog signal as a music source into a digital signal, and 2 denotes an analog / digital converter. A digital signal processor for processing various audio signals based on the output of the digital / analog converter; 3, a digital / analog converter for converting a digital signal into an analog signal; and 4, a volume for adjusting the volume.

[0005] Further, reference numeral 5 denotes an amplifier as a low frequency amplifier for amplifying the output of the volume 4, 6 denotes a speaker for audio output, 7 denotes a microcomputer for controlling the digital signal processor 2, 8 denotes a display, and 15 denotes a display. A delay time selection switch, 16 is a signal level selection switch, and 17 is a channel selection switch.

FIG. 6 shows an analog (continuous time) input signal 2.
3A and 3B are timing charts showing a relationship between a sampling signal 2a and a digital (discrete time) output signal 2b and a sampling period 2c. Here, the input / output state of the analog / digital converter 1 is shown. The digital / analog converter 3 converts a digital signal into an analog signal.

FIG. 7 is a block diagram showing details of the digital signal processor 2. In FIG.
a is an input signal, 2b is a digital output signal, 21 is an adder, 22 is a delay unit for a digital input signal, 23 is a multiplier that together with the delay unit 22 constitutes a reflected sound generation system,
Reference numeral 26 denotes a delay unit 22 that forms a reverberation sound generation system together with the adder 25 and the multipliers 27 and 28. The adder 21 adds the direct sound and the reflected sound to generate a reverberation sound.

FIG. 8 is a signal flow diagram of the response pattern shown in FIG. 7, in which the y-axis represents the amplitude and the x-axis represents the amplitude.
The axis direction represents the delay time, 4a is a direct sound as a digital input signal, 4b is a reflected sound as a digital signal, 4d, 4e, 4f are delay times by the delay units 22, 24, 26, and 4c1 to 4cx are reverberation sounds. It is.

In the conventional sound field creation, as parameters representing the extent, depth, and atmosphere of the sound field, generally, the reverberation time for the direct sound, the magnitude (amplitude) of the reflected sound and the reverberant sound, and the parameters of the reflected sound for the direct sound. There are the number of reverberations and the number of reverberations (density).

Next, the operation will be described. First, the power of the audio device is turned on, and then, as an input signal 2a from a radio, a television recorder, a CD player, or the like, as shown in FIG.
When an acoustic source as shown in (a) is input, it is converted by an analog / digital converter 1 into a digital output signal 2b as shown in FIG. Is entered.

Therefore, in the digital signal processor 2, the delay time selection switch 15, the signal level selection switch 16, and the channel selection switch 17
, A predetermined reflected sound and a reverberant sound are generated and output by a product-sum operation based on the calculation and switching control of the sound field pattern by the microcomputer 7.

This sound field signal output is digital /
After being converted into an analog signal by the analog converter 3, the output is adjusted by the volume 4, the sound quality is adjusted and amplified by the amplifier 5, and the audio signal is output from the speaker 6 as a sound signal with a sound field effect. Become.

Incidentally, each of the delay units 22, 24,
Reference numeral 26 is constituted by, for example, the following operation principle. That is, as shown in FIG. 9, an arbitrary data R is stored in an address A of a memory, and an arbitrary calculation program is processed C times and an operation S is extracted from an address B in the memory. Where R and S are the same,
During this time, a delay of C × (the time for one cycle of the program) is generated.

In the case of the digital signal processor 2, the address changes to A + 1 after one cycle of the program on the hardware. Therefore, if any address A or B is designated by software, , Any delay that is an integer multiple of the program period can be created.

The creation of the sound field according to FIG. 7 can be described with reference to FIG. Now, when the signal of the direct sound 4a is input as the digital input signal 2a, it enters the delay units 22 and 24, and after an arbitrary time, the multiplier 23
And output to the adder 25.

The signal of the direct sound 4a is input to the adder 21. At this time, since the outputs from the delay units 22 and 24 have not been obtained yet, the signal of the direct sound 4a is output as a digital output signal 3b. Is output as is.

The signal input to the multiplier 23 is multiplied by an arbitrary coefficient (0 to 1), and is output to the adder 21 as a signal of the reflected sound 4b in FIG. Further, the signal input to the adder 25 is added to the output of the multiplier 27, then input to the delay unit 26, delayed by a predetermined time, and input to the multiplier 27.

Further, the delayed signal is multiplied by an arbitrary coefficient (0 to 1) by the multiplier 27, input to the adder 21, and further output as a digital output signal 2b. This signal corresponds to the reverberation sound 4c1 in FIG. At this time, the output of the multiplier 27 also enters the multiplier 28 at the same time,
This signal is also multiplied by an arbitrary coefficient (0 to 1) and output to the adder 25.

At this time, in the adder 25, since there is no output from the delay unit 24, the output of the multiplier 28 is again output to the delay unit 26.
, And again output as a digital output signal 2b from the adder 21 through the multiplier 27. This signal corresponds to the reverberation sound 4c2 in FIG. Thereafter, in the same manner,
The reverberation sounds 4c3, 4c4, 4c5,... Are generated as cyclic delay signals.

In the above description, the direct sound 4a is a single digital pulse input. However, in actual music, the direct sound 4a is continuous as shown in FIG. Is what is entered.

When a sound field is created in accordance with the above parameters, it is necessary to determine a physical quantity such as a reverberation time for the direct sound so as to be optimal for the target sound field. Further, when reproducing a stereo sound field, a sound source of at least two channels on the left and right is required. In an acoustic device for creating a sound field, generally, speakers of four or more channels are arranged. That is, the number of parameters obtained by multiplying the physical quantity by the number of reproduction channels must be determined.

Further, when it is desired to obtain a desired feeling of spreading with respect to a preset sound field pattern,
Conventionally, each of the above-described parameters is varied to search for an optimal combination. That is, in FIG. 5, a delay time (delay time) table and a gain (signal level) table as shown in FIG. 10 are used, and the delay time and the gain are selected from these tables by individually selecting various selection switches 1i to 1k. It was adjusted by operating.

Although such a method is very cumbersome and difficult to make such adjustments during operation, it is possible to implement any combination of delay time and gain, especially Depending on the taste of the person, it was possible to reproduce characteristics of a music hall that does not exist in reality.

[0022]

Since the conventional acoustic apparatus is configured as described above, when the sound field is changed according to the user's preference, physical quantities relating to a large number of parameters must be separately adjusted. In addition, there is a problem that the handling of the sound field selection is complicated and troublesome.

For example, when the vehicle is mounted on a vehicle as an on-vehicle acoustic system, the operation for setting the sound field is performed with only one hand during the operation of the steering wheel. However, there is a problem in that deployment to a vehicle involves various restrictions on operability and safe driving. As a technique similar to the conventional acoustic apparatus, Japanese Utility Model Application Laid-Open No. 4-558 is used.
There is one disclosed in Japanese Patent Publication No. 25.

The present invention has been made in order to solve the above-described problems. The size of a one-dimensional amount is determined by a combination of parameters such as a reverberation time for a direct sound and a level of a reflected sound. Operation that gives the desired sound field effect without giving the user meaningless confusion,
It is an object of the present invention to obtain an audio device that allows easy selection.

[0025] This invention aims at obtaining an acoustic device capable of facilitating the understanding of the change in the spread of the sound field to match the human senses the variation of the delay time and signal level.

[0026] The present invention is intended to obtain as an indicator of the room size, the acoustic device that can be easily performed even sound field setting many people.

[0027] This invention uses a filter, and to obtain an acoustic device capable of creating a more atmosphere rich sound field.

[0028] In the present invention the present invention of claim 1, aims at handling obtain an acoustic device capable of preventing the conventional features are lost when solving the problem becomes complicated and troublesome.

[0029]

According to a first aspect of the present invention, an audio apparatus generates a plurality of single delay signals and a cyclic delay signal based on a digital signal as an original signal. Digital output that synthesizes and outputs signals
A signal processor, and adjusting a combination of the original signal, the single delay signal, and the cyclic delay signal in the digital signal processor to create a plurality of sound field patterns; And by changing the delay time, the digital signal
A microcomputer that switches the feeling of the sound field to the processor is provided.
The feeling of the sound field is gradually increased and decreased. Also, the microcomputer has a digital
Signal, single-delay signal in a single signal processor
Signal and cyclic delay signal to adjust
A sound field pattern is created, and each of the above signals is applied to the sound field pattern.
Signal level and the delay time is changed
To the digital signal processor.
It is designed to switch the sense of expanse of the space.

According to a second aspect of the present invention, there is provided an audio apparatus in which filter characteristics of filters connected upstream and downstream of a digital signal processor are changed in accordance with room size adjustment.

An acoustic device according to a third aspect of the present invention includes a delay time selection switch and a signal level selection switch in addition to the first aspect of the invention.

[0032]

The acoustic device according to the first aspect of the present invention expresses the extent of a sound field by a combination of parameters such as a reverberation time for a direct sound and a level of a reflected sound in a one-dimensional relationship. without giving meaningless confusion, operation desired sound field effect can be obtained, if you like easily selected
In both cases, the signal level is expressed in logarithmic form (equal intervals) and the
Time can be treated linearly,
The amount of change in the signal level is matched to human perception to expand the sound field.
It is easy to grasp the change in the feeling.

According to the second aspect of the present invention, the acoustic device is provided with a filter characteristic adapted to a room size.
Furthermore, it is possible to create a sound field with a rich atmosphere.

According to the third aspect of the present invention, the sound device can provide a desired sound field which cannot be obtained only by the up-down control alone by using the delay time selection switch and the signal level selection switch independently or in combination with the up-down control. Make it creatable.

[0035]

[Embodiment 1] An embodiment of the present invention will be described below with reference to the drawings. FIG.
Wherein 1 is an analog / digital converter for converting an analog signal as a music source into a digital signal, and 2 is a digital signal converted from the digital signal as an original signal.
The digital signal processor generates a plurality of single delay signals and a cyclic delay signal based on the original signal, and combines and outputs these three signals.

Reference numeral 3 denotes a digital / analog converter for converting the output signal of the digital signal processor 2 from analog to analog, 4 denotes a volume for adjusting the level of the analog output, and 5 denotes an output for adjusting the analog-converted signal. After that, it is an amplifier that outputs to the speaker 6.

7 is the digital signal
The processor 2 adjusts the combination of the original signal, the single delay signal, and the cyclic delay signal to create a plurality of sound field patterns, and changes the level and delay time of each of the signals with respect to the sound field pattern. This is a microcomputer that causes the digital signal processor 2 to switch the sense of expansion of the sound field.

Further, 9 is an up-down operator which is operated so as to gradually increase and decrease the feeling of the sound field spreading;
Reference numeral 8 denotes a display for displaying the audio output level, the spread of the sound field, and the like.

Next, the operation will be described with reference to the flowchart of FIG. First, adjust the power switch,
Perform initial settings such as volume adjustment and sound quality adjustment.
To enter the sound field setting mode, key input is performed (step ST1).

Subsequently, the up-down operator 9 shown in FIG.
Is operated to raise the sound field using the room size as an index, the up-down operator 9 is operated up (step ST2), and conversely, when the sound field is lowered, the down operation is performed (step ST3). When the up operation is performed, the memory address is counted up (step ST).
4) When the down operation is performed, the memory address is counted down (step ST5).

For this reason, the microcomputer 7 reads the room size parameter corresponding to each memory address from the memory (step ST6), and transfers the parameter to the digital signal processor 2 (step ST7). Subsequently, when the setting mode is continued (step ST8), the processing from step ST2 is executed, and when the setting mode is not continued, the apparatus stands by for another processing (step ST9).

As shown in FIGS. 3A and 3B, the room size parameter is data in which a delay time (delay time) and a reflected sound level correspond to the room size. Are formed corresponding to the memory addresses.

That is, in the present invention, these parameters are combined as shown in the tables of FIGS. 3A and 3B, and the addresses are designated and stored in the memory of the control microcomputer 7. . In addition, this combination, for each preset sound field mode,
Combinations of parameters having different expansiveness are made to correspond to the room size.

Therefore, by storing such room sizes in order based on the magnitude of the sense of spaciousness, the user can select the room size with the up / down operator 9 to obtain the sound field desired by the user. You can easily choose.

Embodiment 2 FIG. In the above sound field selection, the delay time of the audio signal is changed at equal intervals, and the level (gain) of the audio signal is changed at equal intervals. By doing so, the amount of change in the delay time and the level becomes easy to handle, and the delay time and the level match the human hearing, so that the change state of the sound field becomes easy to understand.

For example, if the delay time is doubled, the distance to the wall is considered to be double when considering the initial reflected sound. Further, by using a logarithmic expression (equivalent interval) for the signal level (gain), the amount of change can be treated as a linear value.
The change from 20 dB to -14 dB also changes from -10 dB to -4 dB.
The change in B can also be considered as a change of +6 dB, and the sound field setting and the operation amount of the sound field setting knob can be easily set.

Embodiment 3 FIG. In each of the above embodiments, the room size (sound field pattern)
In addition, delay time, sound reflection, reverberation magnitude, reflection,
Although the case where the number of reverberations is combined is shown, as shown in FIG. 4, a delay unit 1 is provided before the input unit of the input signal 2a and after the output unit of the digital output signal 2b.
0, a multiplier 11 and filters 12, 13 are arranged,
By combining the delay time and the filter coefficient of the signal input / output to / from the digital signal processor 2,
It can also create a more diverse and atmospheric sound field.

In this case, reference numeral 20 denotes an interlocking control signal output from the digital signal processor 2 in response to selection switching of the room size. By switching the interlocking control signal 20, the characteristics of the filters 12, 13 are changed in conjunction with the selection switching of the room size, so that a more comfortable sound field effect can be produced.

Embodiment 4 FIG. In the music apparatus of the first embodiment, the operation is easy, but it is impossible to select a characteristic other than the characteristic set in the predetermined table. The taste of music varies from person to person, and some people may not be satisfied with the above table in which settings simulating a music hall in a range considered to exist in reality are input.

On the other hand, it is easy to input a large number of combinations into the table, but doing so increases the difficulty for the operator to make a selection, which is contrary to the intended purpose. Therefore, in order to solve such a contradiction, the delay time selection switch 15 and the signal level selection switch 16 of FIG. 5 may be used in combination with the apparatus of FIG.

Although not shown, a switch for selecting operation using the up / down operator 9 or operation using conventional selection switches 15 and 16 may be additionally provided. Good.

Further, the up-down operation element 9 and the above-mentioned selection switches 15 and 16 are configured to operate in parallel (simultaneously), and by operating these selection switches 15 and 16, the sound field desired by the operator is obtained. The characteristic change range by the up / down operator 9 may be shifted toward a characteristic that gives a feeling. If the shape of the selection switches in such a case is operated using, for example, a driver, no problem arises with respect to the above-mentioned small space around the driver's seat.

[0053]

As described above, according to the first aspect of the present invention, a plurality of single delay signals and a cyclic delay signal are generated based on a digital signal as an original signal.
A digital signal processor for synthesizing and outputting these three signals, and creating a plurality of sound field patterns by adjusting a combination of the original signal, the single delay signal and the cyclic delay signal in the digital signal processor. A microcomputer for changing the level and delay time of each of the signals with respect to the sound field pattern to switch the digital signal processor so that the sound field is spread. The structure of the sound field is designed to increase and decrease gradually, so that the user can express the width of the sound field by a combination of parameters such as the reverberation time for the direct sound and the level of the reflected sound in a one-dimensional relationship. That can be easily operated and selected to obtain the desired sound field effect without causing meaningless confusion There is a result. In addition, micro
For digital signal processors
Combination of original signal, single delay signal and cyclic delay signal
To create a plurality of sound field patterns,
The level of each of the above signals is changed
By changing the delay time isometrically, the digital signal
Let the processor switch the sound field
The delay time and signal level change
It is possible to grasp the change of the sound field
There is an effect that what can be easily obtained is obtained.

According to the second aspect of the present invention, the filter characteristics of the filters connected before and after the digital signal processor are changed according to the room size adjustment. There is an effect that a sound field that can create a rich atmosphere can be obtained.

According to the third aspect of the present invention, any operation can be performed independently or in combination with the up-down operator,
A delay time selection switch and a signal level selection switch for arbitrarily changing the delay time and the level of each signal with respect to the sound field pattern are provided. In addition to the effect of the invention of claim 1, which can be gradually reduced, a unique characteristic according to the operator's preference or a unique characteristic not within the adjustment range of the up / down operator can be set. There is an effect that a device capable of obtaining a sound device having the same can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an acoustic device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a sound field signal output processing procedure according to the present invention.

FIG. 3 is a table diagram showing a table of room size parameters stored in a memory in the microcomputer in FIG. 1;

FIG. 4 is a block diagram showing a main part of an audio device according to one embodiment of the present invention.

FIG. 5 is a block diagram showing a conventional acoustic device.

6 is a waveform diagram showing an analog input signal and a digital output signal of the analog / digital converter in FIG.

FIG. 7 is a block diagram showing details of the digital signal processor in FIG. 5;

8 is a timing chart showing signals in respective parts of the block in FIG. 7;

FIG. 9 is an explanatory diagram showing an operation of the delay unit in FIG. 7;

FIG. 10 is a table showing a delay time table and a gain table stored in a memory in the microcomputer in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Analog / Digital converter 2 Digital signal processor 3 Digital / Analog converter 5 Amplifier 6 Speaker 7 Microcomputer 9 Up / down operator 12, 13 Filter 15 Delay time selection switch 16 Signal level selection switch

Continuation of the front page (56) References JP-A-4-204895 (JP, A) JP-A-3-136408 (JP, A) JP-A-1-300697 (JP, A) JP-A-3-129911 (JP) JP-A-1-125100 (JP, A) JP-A-2-254899 (JP, A) JP-A-2-254900 (JP, A) JP-A-3-105098 (JP, U) JP-A 4-55825 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H03G 5/00-11/08 G10K 15/12 H04S 1/00

Claims (3)

(57) [Claims] 1. An analog / digital converter for converting an analog signal as a music source into a digital signal, and a plurality of single delay signals and a cyclic delay signal based on the digital signal as an original signal. And a digital / analog converter for converting the output signal of the digital signal processor into an analog signal, and adjusting the output of the analog-converted signal. A plurality of sound field patterns are created by adjusting a combination of the amplifier, which outputs the signal to the speaker after the execution, and the original signal, the single delay signal, and the cyclic delay signal in the digital signal processor. The level of each signal is changed isometrically, and the delay time is changed isometrically. An audio apparatus comprising: a microcomputer for causing the digital signal processor to switch a feeling of spreading of a sound field; and an up / down manipulator operated to gradually increase and decrease the feeling of spreading of the sound field. 2. An analog / digital converter for converting an analog signal as a music source into a digital signal, and a plurality of single delay signals and a cyclic delay signal based on the digital signal as an original signal. And a digital / analog converter for converting the output signal of the digital signal processor into an analog signal, and adjusting the output of the analog-converted signal. A plurality of sound field patterns are created by adjusting a combination of the amplifier, which outputs the signal to the speaker after the execution, and the original signal, the single delay signal, and the cyclic delay signal in the digital signal processor. By changing the level and delay time of each of the above signals,
A microcomputer for causing the digital signal processor to switch the sense of spaciousness of the sound field, an up / down operator operated to gradually increase and decrease the sense of spaciousness of the sound field with the room size as an index, and the digital signal・ Connected to the front stage of the processor,
An audio device comprising: a filter whose filter characteristics are changed according to the room size adjustment. 3. An analog / digital converter for converting an analog signal as a music source into a digital signal, and a plurality of single delay signals and a cyclic delay signal based on the digital signal as an original signal. And a digital / analog converter for converting the output signal of the digital signal processor into an analog signal, and adjusting the output of the analog-converted signal. A plurality of sound field patterns are created by adjusting a combination of the amplifier, which outputs the signal to the speaker after the execution, and the original signal, the single delay signal, and the cyclic delay signal in the digital signal processor. By changing the level and delay time of each of the above signals,
A microcomputer for causing the digital signal processor to switch the sense of expansion of the sound field; an up-down operator operated to gradually increase and decrease the sense of expansion of the sound field; and an independent up-down operator. An audio apparatus comprising: a delay time selection switch and a signal level selection switch that are arbitrarily operated in combination with or in combination with each other to arbitrarily change the delay time and the level of each signal with respect to a sound field pattern.