JPH06186966A - Effector - Google Patents

Abstract

PURPOSE:To provide the effector which reproduces reverberation effects in a specific space precisely in another space. CONSTITUTION:A musical instrument body 1 is provided with plural hall selection switches 3... corresponding to well-known halls such as the Carnegie Hall and the Munich Philharmony hall, a speaker 5, and a microphone 6. A ROM arranged in the musical instrument body 1 is stored with reverberation characteristics of the well-known halls corresponding to the hall selection switches 3. The speaker 5 generates a specific reference sound when reverberation characteristics in an optional space are detected and the microphone 6 detects the direct sound of the reference sound generated by the speaker 5 and its reflected sound. The reverberation characteristics in the space are extracted from the direct sound and reflected sound in the space detected by the microphone 6 and compared with reverberation characteristics of a hall selected through the operation of the hall selection switch 3, and effect processing is performed by using parameters based upon the comparison result.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an effector for adding a reverberation effect to an input waveform.

[0002]

2. Description of the Related Art As a conventional effector, there is one that adds a reverberation effect in a well-known hall such as Munich Philharmonic Hall or Carnegie Hall to an input waveform. This effector actually measures reverberation characteristics in each hall, and stores the measured reverberation characteristics for each hall. Then, for example, when a desired hall is selected when playing in a room, the DSP operates according to the reverberation characteristic of the selected hall, and the reverberation effect similar to that when playing in the hall is added to the generated musical sound.

[0003]

However, in such a conventional effector, the reverberation characteristic of the uniformly selected hall is generated without any consideration of the reverberation characteristic of the space where the performance is performed using the effector. I am trying to add it to. On the other hand, a space with its own room, etc., where an actual performance is to be performed using this effector has its own reverberation characteristic. Therefore, even if the reverberation effect of the hall in the generated tone is added, the reverberation effect due to the reverberation characteristic peculiar to the space in which the performance is performed is further added to the generated tone added with the reverberation effect. In other words, even if the reverberation effect of a well-known hall is added to the generated musical sound, the reverberation effect peculiar to the space is added to the generated musical sound to which this reverberation sound is added. It will be different. Therefore, the reverberation effect in a given space is
It could not be reproduced accurately in other spaces.

An object of the present invention is to provide an effector capable of accurately reproducing the reverberation effect in a predetermined space in another space.

[0005]

According to the present invention, in order to solve the above-mentioned problems, a storage means for storing reverberation characteristics of a sound produced in a predetermined space in the predetermined space is the same as the storage means. Sounding means for producing the sound, the extracting means for extracting the reverberant characteristic in an arbitrary space in which the sound is pronounced by the sounding means, the reverberant characteristic extracted by the extracting means and stored in the storage means. Comparing means for comparing the reverberation characteristics, determining means for determining an effect parameter based on the comparison result by the comparing means, and effect processing means for performing effect processing using the effect parameter determined by the determining means. Have

[0006]

In the above structure, when the sounding means produces a sound in an arbitrary space such as the own room, the reverberation characteristic of the space is extracted by the extracting means. The extracted reverberation characteristic of the space and the reverberation characteristic of a predetermined space such as a well-known hall stored in the storage unit are compared by the comparison unit, and the effect parameter is determined based on the comparison result. Therefore, in this decided effect parameter,
Not only the reverberation characteristics in a predetermined space such as a well-known hall, but also the reverberation characteristics in an arbitrary space such as one's own room are taken into consideration. Therefore, if the effect processing means executes the effect processing using the effect parameters, the reverberation effect of a predetermined space such as a well-known hall can be added under the condition in which the reverberation characteristic in an arbitrary space is taken into consideration.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. That is, FIG. 1 is a partial external view of an electronic musical instrument to which the present embodiment is applied. In the musical instrument body 1, a plurality of hole selection switches 3 corresponding to well-known holes such as a power switch 2, Carnegie, Munich Philharmonic, etc.
A keyboard switch (not shown) provided for each key of the keyboard 4, a speaker 5 and a microphone 6 are provided. The speaker 5 generates a predetermined reference sound when detecting a reverberation characteristic in an arbitrary space such as a room, and also generates a musical sound associated with the operation of the keyboard 4, and the microphone 6 generates the reference sound generated from the speaker 5 and the reference sound. Detects reflected sound.

FIG. 2 is a block diagram showing the overall configuration of this electronic musical instrument. The CPU 7 and an effector section (DSP) 8 provided at the output stage of the CPU 7 have a D for converting the input from the microphone 6 into an analog signal. / A converter 9, switch section 10 composed of each of the switches 2 and 3 and RAM
11 is connected via a bus line. CPU7
Performs not only the processing for storing the direct sound and the reflected sound of the reference sound detected by the microphone 6 in the RAM 11 and all the controls necessary for realizing the functions of this electronic musical instrument, but also the musical sound. The process of generating a musical tone by program control is also executed without using the tone generator circuit hardware for generation.

That is, in the ROM 12 in the CPU 7,
A sound source processing program shown by a timer interrupt routine is stored together with an overall processing program shown by a main routine which will be described later. Further, various tone control parameters such as envelope data (rate, level, etc.), pitch data, and tone of PCM are stored. Waveform data and the like are stored. The pitch data is an address addition value when reading musical tone waveform data, and when the keyboard switch is turned on by pressing a key, pitch data corresponding to the pitch, waveform start address, waveform end address, waveform RAM for working loop address
13 is set in the intermediate data storage area prepared.

The RAM 13 is provided with an accumulation register R for temporarily storing the musical tone waveform data of each channel (accumulated waveform value for four channels) generated by the sound source processing in the timer interrupt routine.
The musical tone waveform data generated by the timer interrupt routine is a signal C from a control unit in the CPU 7 including an instruction decoder (not shown) or the like.
It is latched by the latch A which operates in response to the OM and input to the latch B. The latch B operates at the timing according to the frequency of the signal INT requesting the execution of the timer interrupt routine. This signal INT is a stable signal of about 40 KHz which is frequency-divided and generated by a hard clock.
Musical tone waveform data is output to the D / A converter 14 via the effector unit 8 at a constant sampling period depending on the frequency of T.

The timer interrupt routine is I
The main routine is interrupted and executed at regular time intervals according to the frequency of NT, but the timing at which the timer interrupt routine is actually started and the timing at which it is ended may vary. That is, the CPU 7 cannot immediately interrupt the operation being executed even if an interrupt occurs, and the interrupt processing is started after the execution is completed. Further, the time required for the timer interrupt process also depends on the process, and therefore the generation period of the musical tone waveform data becomes unstable. Therefore, the CO
A latch B controlled by the INT which is an accurate timing signal is provided between the latch A controlled by the M signal and the effector section 8. As a result, even if the latch timing of the latch A changes due to the processing time of the interrupt processing or the like, the timing at which the input data of the D / A converter 14 is switched is synchronized with the INT due to the existence of the latch B that operates at the INT timing. To do. That is, D / A
A signal delayed by one INT cycle is input to the converter 14.
It is input at the timing of T and converted to analog. The voice waveform signal analog-converted by the D / A converter 14 is filtered by the low-pass filter 15, then amplified by the amplifier 16, and emitted through the speaker 5.

The ROM 12 stores the reverberation characteristics of each hole corresponding to the hole selection switch 3 as well as the above-mentioned various programs, various tone control parameters, and PCM tone waveform data. The reverberation characteristics are shown in FIGS. It was detected by the method shown in. That is, as shown in FIG. 3, a sounding body 18 and a microphone 19 are installed in a well-known hall 17 corresponding to the hall selecting switch 3, and the sound generating body 18 serves as the reference sound generated by the speaker 5. Produces the same sound. Then, as illustrated in FIG. 4, the microphone 18 after the direct sound WH ₀ reference tone T has come, first through fourth reflection sound WH ₁ ~WH ₄ corresponding to the reverberation characteristics of the hole 17 arrives . Then, the envelope of the direct sound WH ₀ and each of the reflected sounds WH _{1 to} WH ₄ arriving at the microphone 18, and predetermined data of the envelope (direct sound W
H ₀ is a real time from the arrival to the first reflected sound WH ₁ arrives initial delay time the IH, the first reflected sound WH ₁ and peak value HH and the like) as a reverberation characteristic of the Hall, ROM 12 I remember it.

Next, the operation of this embodiment having the above configuration will be described with reference to the flow chart showing the outline of the program executed by the CPU 7. That is, FIG. 5 is a main routine of the present embodiment, which is started when the power switch 2 is turned on, and first, the initialization process (SA1) is performed to clear the register group provided in the RAM 13 and set initial values. Next, the functional switches such as the hole selection switch 3 other than the keyboard switch provided in the switch unit 10 are scanned (SA2), and the functional switch that has changed from the previous state is identified based on the scan result in SA2. A corresponding process is performed (SA3). Subsequently, the keyboard switch in the switch unit 10 is scanned (SA4), and corresponding processing such as note-on and note-off is performed according to the scan result in SA4 (SA5). Furthermore, SA3 and SA5
Other processes other than those executed in (SA
6), and thereafter, while the power is on, the processes of SA2 to SA6 are repeated.

With respect to this main routine, the timer interrupt routine shown in FIG. 6 interrupts at the above-mentioned timing and performs sound source processing (SB1). Sound source processing (S
B1) is executed according to the flow shown in FIG. 7, and first, the accumulation register R provided in the RAM 13 is cleared (SC1). As a result, the accumulated waveform values for channels 1 to 4 stored in the previous sound source processing are deleted, and then the sound source processing for all channels 1 to 4 is sequentially executed (SC2 to SC5).

That is, in SC2, the waveform value of 1ch is obtained, and this is set in R, and in SC3, 2ch is similarly set.
The waveform value of is calculated and accumulated in R. Furthermore, SC4 and S
In C5, waveform values of 3ch and 4ch are sequentially accumulated to the value of R accumulated in the previous step. Therefore, at the time when the process of SC5 is completed, R stores the accumulated waveform values of 1ch to 4ch. Then, the accumulated waveform value stored in this R is latched in the latch A in SB2 of FIG. 6, and thereby the accumulated waveform of 1ch to 4ch is stored in the latch A at the timing when the sound source processing (SB1) ends. The value is latched. Further, the accumulated waveform value latched by the latch A is latched by the latch B with an accurate constant sampling period which is divided and generated by the hard clock as described above.
Latched by the A / D converter 6 via the effector unit 8.
Is input to and converted into an analog value, whereby a tone without distortion is emitted from the speaker 5.

On the other hand, in SA3 of FIG. 5, a part of the processing is executed according to the flow shown in FIG. That is,
First, based on the scan result of the switch unit 10, it is determined whether any of the hole selection switches 3 has been operated (SD1). When any of the hall selection switches 3 is operated, a recording instruction such as activation of the microphone 6 is given (SD2), and an instruction to generate the reference tone T is given (SD3). As a result, the same sound as the reference sound T generated by the sounding body 18 in the hall 17 shown in FIG. 3 is generated from the speaker 5. Reference sound T generated from the speaker 5
Of the direct sound and the reflected sound in the space in which the reference sound T is being generated now are detected by the microphone 6, and the envelopes of the direct sound and the reflected sound detected by the microphone 6 are stored in the RAM 1
Stored in 1. Subsequently, it is determined whether or not the envelope of the sound detected by the microphone 6 has become 0 (S
D4), recording is continued until ENV = 0. When ENV = 0, the recording cancellation is instructed (SD5), the microphone 6 is stopped, and the RAM1
Stop remembering to 1.

Therefore, if the electronic musical instrument is brought into the 6-mat room 20 shown in FIG. 3 and the hall selection switch 3 is operated, the direct sound of the reference sound T is stored in the RAM 11 as shown in FIG. WR _0, and the first reflected sound WR ₁ and the second reflected sound WR ₂ generated from the reverberation characteristic of the 6 tatami mat 20
The envelope of is stored.

Next, based on the envelope stored in the RAM 11, as shown in FIG. 10, from the arrival of the direct sound WR ₀ in the 6 tatami mat 20 to the arrival of the first reflected sound WR _1. An initial delay time IR, which is time, is calculated (SD6). Further, the initial delay time IH of the hall corresponding to the operated hall selection switch 3 is read from the ROM 12 (SD7). After that, the initial delay time I of 6 tatami mats 20
R is compared with the initial delay time IH of the hall to determine whether IH is larger than IR (S
D8). If IH> IR and the initial delay time IR of 6 tatami mat 20 is shorter than the initial delay time IH of the hall, the difference IH-IR is set as the initial delay parameter D (SD
9).

Subsequently, 6 stored in the RAM 11
The crest value HR of the first reflected sound WR ₁ is calculated based on the envelope of the first reflected sound WR ₁ in the tatami mat 20 (SD10). Further, the peak value HH of the first reflected sound WH ₁ of the hole corresponding to the operated hole selection switch 3 is read from the ROM 12 (SD11), and the ratio HR / HH HH / HR is set as the coefficient correction data KC (SD
12).

Therefore, the initial delay parameter D and the correction coefficient KC are obtained by completing the processing shown in the flow of FIG. Then, at the time of sound generation, an envelope corresponding to the reverberation characteristic of the hall selected by operating the hall selection switch 3 is used. In this envelope, the initial delay IH is corrected by the initial delay parameter D, and the correction data KC is used. The peak values of the reflected sounds WH _{1 to} WH ₄ are corrected. Therefore, from the speaker 5, the keyboard 4
Along with the sound corresponding to the operation, the pseudo-reverberation sounds corresponding to the reflected sounds WH _{1 to} WH ₄ whose peak values have been corrected are generated.

At this time, the pseudo-reverberation sound generated from the speaker 5 is affected by the reverberation characteristic of the room. However, the pseudo-reverberation sound generated from the speaker 5 is previously corrected according to the reverberation characteristics of the room. Therefore, if the pseudo reverberation is affected by the reverberation characteristics of the room, the correction cancels the reverberation component of the room included in the pseudo reverberation. As a result, the reverberation effect of the selected hall can be reproduced in any space regardless of the reverberation characteristics of the room.

In the embodiment, the peak value of the pseudo reverberant sound generated from the speaker 5 is corrected according to the peak value ratio of the reflected sound between the hall and the arbitrary space. The level of the pseudo-reverberation sound may be corrected according to the ratio.

[0023]

As described above, according to the present invention, the effect parameter is determined based on the result of comparison between the reverberation characteristic of a predetermined space such as a well-known hall stored beforehand and the reverberation characteristic extracted in an arbitrary space. The effect processing is performed using the determined effect parameter. Therefore, it is possible to add the reverberation effect of a predetermined space while considering the reverberation characteristic in an arbitrary space, and as a result, a predetermined reverberation characteristic can be obtained in any space without being influenced by the reverberation characteristic of the arbitrary space. The reverberation effect of the space can be accurately reproduced.

[Brief description of drawings]

FIG. 1 is a plan view of an external appearance of a main part of an electronic musical instrument to which an embodiment of the present invention is applied.

FIG. 2 is a block diagram showing an overall configuration of the electronic musical instrument.

FIG. 3 is an explanatory diagram showing a method of detecting reverberation characteristics in a hall.

FIG. 4 is a waveform diagram showing a storage result of detected reverberation characteristics.

FIG. 5 is a flowchart showing a main routine.

FIG. 6 is a flowchart showing a timer interrupt routine.

FIG. 7 is a flowchart showing the contents of sound source processing in a timer interrupt routine.

8 is a flowchart showing a part of the processing of SA3 in the main routine shown in FIG.

FIG. 9 is a waveform diagram showing a detection result of reverberation characteristics detected in an arbitrary room.

10 is a waveform chart showing the processing contents of the flowchart shown in FIG.

[Explanation of symbols]

 3 Hall selection switch 5 Speaker 6 Microphone 7 CPU 8 Effector section 11 RAM 12 ROM 17 Hall

Claims (1)

[Claims] 1. A storage means for storing reverberation characteristics of a sound produced in a predetermined space in the predetermined space, a sound producing means for producing the same sound as the sound, and the sound produced by the sound producing means. Extracting means for extracting reverberation characteristics in an arbitrary space, comparing means for comparing the reverberation characteristics extracted by the extracting means with the reverberation characteristics stored in the storage means, and based on the comparison result by the comparing means. An effector comprising: a determining unit that determines an effect parameter by means of the effect parameter; and an effect processing unit that executes an effect process by using the effect parameter determined by the determining unit.