JPH0683346A - Musical sound processor - Google Patents

Abstract

PURPOSE:To process a timbre when a musical performance is done by a method which involves variation in pitch. CONSTITUTION:An input musical sound signal is inputted and its timbre is generated by a comb line filter 10, whose frequency characteristics are set with the parameter signal obtained by converting pitch data, generated by detecting the pitch of the input musical sound signal by a pitch detection part 22, by an arithmetic part 20. The arithmetic part 20 is provided with a deviation adding means which adds a deviation to the pitch data or parameter and shifts the pitch of the input musical sound signal and the fundamental frequency of the peak frequency of the comb line filter 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a musical tone processing apparatus for processing a tone color of a musical tone.

[0002]

2. Description of the Related Art Conventionally, as a tone processing apparatus, a tone signal is input to a comb filter, the pitch of the tone signal is detected by a pitch detecting means, and the frequency of the comb filter is adjusted so as to correspond to the detected pitch. There was something to adjust the characteristics. That is, the peak of the frequency characteristic of the comb filter is generated at the fundamental frequency of the input musical tone signal and the frequency which is an integral multiple thereof, and the characteristic of the comb filter is also changed according to the change of the pitch of the input musical tone signal. Therefore, the fundamental frequency (pitch) of the input musical tone signal and the harmonic component of an integral multiple thereof always match the respective peak frequencies of the comb filter.

[0003]

Therefore, in the musical tone processing apparatus as described above, since the frequency of the peak portion of the comb filter and the frequency of the harmonic component of the input musical tone signal are always the same, a large change in tone color can be obtained. There was a drawback that I could not do it. Further, even with respect to the pitch change of the musical tone signal after the start of sound generation, for example, the pitch variation caused when choking or vibrato is applied to the electric guitar, the musical tone processing device as described above follows the variation of the pitch of the musical tone signal. The frequency of the comb filter is also changed. Therefore, there is a problem in that the harmonic components of the tone signal after being choked or vibrato cannot be processed, and the tone color change is poor.

The present invention provides a larger timbre change that cannot be obtained by a timbre processing device using a conventional filter, and a timbre that can greatly change the timbre when there is a pitch change in a tone signal. An object is to provide a processing device.

[0005]

In order to achieve the above object, in the first aspect of the present invention, a pitch detecting means for detecting the pitch of an input musical tone signal to obtain pitch data and the input musical tone signal are inputted. And a parameter generating means for inputting the pitch data and converting the pitch data into a parameter for setting the frequency characteristic of the comb filter means, wherein the parameter generating means includes: A deviation adding means for adding a deviation to the pitch data or the above parameters is provided.

The second invention, like the first invention, comprises pitch detecting means, comb-shaped filter means, and parameter generating means, and the parameter generating means comprises:
It has a non-linear conversion means for making the relationship between the pitch data and the parameter a non-linear characteristic.

The third invention, like the first invention, comprises pitch detecting means, comb filter means, and parameter generating means, and the parameter generating means comprises:
A delay means for delaying the pitch data or the parameter is provided.

The fourth invention, like the first invention, comprises pitch detecting means, comb filter means, and parameter generating means, and the parameter generating means comprises:
A filter means for filtering the pitch data or the parameters is included.

The fifth aspect of the invention, like the first aspect of the invention, comprises a pitch detecting means, a comb filter means, and a parameter generating means, and further detects a rising edge for detecting the rising edge of the input musical tone signal. It also has means. The parameter generating means has a holding means for holding the pitch data or the parameter at the rising edge of the input musical tone signal detected by the rising edge detecting means.

[0010]

According to the first aspect of the invention, the parameter generating means generates a parameter for controlling the frequency characteristic of the comb filter means on the basis of the pitch detected by the pitch detecting means. Deviation is added. Therefore, the fundamental frequency of the input musical tone signal and its harmonic components and the peak frequencies of the comb-shaped filter means do not match and deviate. This shift becomes larger as the frequency of the harmonic component becomes higher. Therefore, the level of the harmonic component included in the output of the filter means is different from the corresponding harmonic component of the input musical tone signal. Therefore, by appropriately selecting the above deviation, it is possible to perform timbre processing which cannot be obtained by the conventional filter.

Also in the second aspect of the invention, the parameter generating means generates a parameter for controlling the frequency characteristic of the comb filter means on the basis of the pitch detected by the pitch detecting means. , Because the parameters to the comb filter means vary non-linearly,
If it is considered that the parameter is added with the deviation, the deviation amount of the parameter is not constant. As a result, the deviation amount of the parameter changes with respect to the change of the pitch of the input signal.

In the third invention, the parameter generating means generates the parameter for controlling the frequency characteristic of the comb filter means on the basis of the pitch detected by the pitch detecting means. However, since the delay means is provided, the tone signal is generated. Since the parameter of the comb filter means is delayed with respect to the change of the pitch of the tone signal, there is a time-varying deviation between the pitch of the tone signal and its harmonics and each peak frequency of the comb filter, and thus the tone color. Can be processed.

Even when the filter means is provided instead of the delay means as in the fourth aspect of the invention, a deviation occurs between the pitch and its harmonics and each peak frequency of the comb filter, so that the tone color processing can be performed. it can.

In the fifth aspect of the invention, pitch data is detected at the rising edge of the input musical tone signal, and this pitch data or a parameter based on this pitch data is held at the rising edge of the input musical tone signal detected by the rising edge detecting means. . Therefore, the parameters supplied to the comb filter means always maintain a certain value. When the pitch of the input musical tone signal changes, the frequency characteristic of the comb-shaped filter means due to the specific parameter and the frequency characteristic of the input musical tone signal become different, and the harmonic components of the input musical tone signal passing through the comb-shaped filter means become different. Will have different levels and the timbre will change.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment is shown in FIGS. In this embodiment, for example, the output sound of an electric guitar is processed, and this output sound is supplied to the comb filter 10. The comb filter 10 has a coefficient k for the output sound.
It has a multiplier 12 that functions as an attenuator by multiplying (0 <k ≦ 1). This multiplier 12
The output of is added to the output of the multiplier 16 described later in the adder 14 and supplied to the delay 18. The output from the delay 18 is multiplied by the feedback coefficient FB (0 <FB ≦ 1) in the multiplier 16 and fed back to the adder 14. The output of the adder 14 is taken out as the output of the comb filter 10. The comb filter 10 can adjust each peak frequency of the comb-shaped frequency characteristic by adjusting the number m of delay stages of the delay 18. In addition, since digital processing is performed in the embodiment, A and A are connected to the input terminal and the output terminal.
Although the / D conversion means and the D / A conversion means are necessary, the A / D and D / A conversion means will be omitted for simplicity of explanation and drawings. Further, the number of delay stages m of the delay 18 can be set to the number of delay stages represented by a decimal point by using interpolation calculation.

The adjustment of the number of delay stages, that is, the parameter of the frequency characteristic of the comb filter is performed by the parameter signal supplied from the arithmetic unit 20. Conventionally, the setting of this parameter has been performed so that the pitch of the output sound of the electric guitar is detected by the pitch detector 22 and the pitch matches the fundamental frequency of each peak frequency of the comb filter 10. For example, the pitch detector 22
Assuming that the pitch detected in 2 is 2 KHz, the peak frequencies of the comb filter 10 are 2 KHz, 4 KHz, and 6 KHz.
The calculation unit 20 calculates the parameter signal for setting the number of delay stages of the delay 18 so that KHz ... Assuming that the pitch detected by the pitch detecting unit 22 is fp and the sampling frequency when the output sound of the electric guitar is converted into a digital signal by an A / D converting means (not shown) is fs, this parameter signal is fs / fp
It is obtained by performing the operation of.

However, in this embodiment, after the parameter signal for making the pitch of the output sound and the fundamental frequency of each peak frequency of the comb filter 10 coincide with each other as described above, the operator 24 can arbitrarily preliminarily use the parameter signal. The set offset amount is added to the calculated parameter signal.

By adding such an offset amount,
For example, if the parameter signal is made slightly smaller than the parameter signal required to match the pitch of the output sound and the fundamental frequency of each peak frequency of the comb filter 10, that is, the pitch of the output sound and each peak of the comb filter 10. When the number of delay stages of the delay 18 is set to a number of delay stages slightly shorter than the number of delay stages required to match the fundamental frequency, the spectrum of the output sound shown in FIG. 2A and the same FIG. 2B. As is clear from the comparison with the frequency characteristics of the comb filter 10 shown in FIG. 3, the deviation between each peak frequency of the comb filter 10 and each harmonic component of the output sound is Df1 and Df.
As shown in FIG. 2A, 2, Df3, Df4, and Df5 become larger as the harmonic becomes higher in order.

As a result, as shown in FIG. 7C, higher harmonics are attenuated to a greater extent and are output from the comb filter 10, and the non-integer multiple high frequencies are attenuated, and at the same time the output sound is passed to the low pass filter. It is possible to perform the same tone processing as that done.

Although the offset amount is added to the parameter signal by the calculation unit 20 in the above embodiment, the offset amount may be added to the pitch detection signal detected by the pitch detection unit 22. Further, the parameter signal or the pitch detection signal may be multiplied by an appropriate coefficient.

Further, in the above embodiment, the arithmetic unit 20 is used to obtain the division value of the detection pitch fp and the sampling frequency fs, and the offset amount is added to this to obtain the parameter signal. That is, there is a linear relationship between the pitch detection signal and the parameter signal, and the offset amount is
It is always constant no matter how much the pitch detection signal changes.

However, in place of the arithmetic unit 20, if a non-linear conversion means for generating a parameter signal having a non-linear relationship with the pitch detection signal, for example, is provided (this non-linear conversion means is, for example, a lookup circuit). This can be easily achieved by using a table.), For example, the larger the pitch change is, the larger the offset is, or conversely, the larger the pitch change is, the smaller the parameter signal having the offset is generated. be able to.

A second embodiment is shown in FIGS. 3 to 5. In this embodiment, the parameter signal from the arithmetic unit 20 is supplied to the delay 18 via the delay unit 26 as shown in FIG. The other parts are configured in the same manner as in the first embodiment, so detailed description will be omitted.

The output sound of the electric guitar has a frequency component as shown by a dotted line in FIG. 4A, and the comb filter 10 has a frequency characteristic as shown in FIG. 4B, that is, a pitch of the output sound. Assuming that the fundamental frequency of the peak frequency has a slightly high frequency characteristic, the output of the comb filter 10 has a frequency component as shown by the dotted line in FIG.

In this state, it is assumed that a playing technique such as choking is performed, and the frequency component of the output sound of the electric guitar changes so that the pitch becomes higher as shown by the solid line in FIG. At this time, the pitch detection unit 22 detects a change in pitch, and the calculation unit 20 responds to the changed pitch by
Further, although the parameter signal to which the offset is added is generated, since the delay unit 26 is provided, the new parameter signal is not yet supplied to the comb filter 10, and the frequency characteristic of the comb filter 10 is This is the state as shown in FIG.

Therefore, each frequency component of the output sound temporarily moves in a direction in which each frequency component of the output sound and each peak frequency of the comb filter 10 coincide with each other. As a result, as shown by the solid line in FIG. 7C, the harmonic component of the output of the comb filter 10 increases, and the tone color of the musical tone changes due to the choking performance.

In this embodiment, the delay unit 26 is replaced by the arithmetic unit 20.
Although the parameter signal is delayed by being provided on the output side of, the delay section 26 may be provided on the input side of the computing section 20 to delay the pitch detection signal and supply it to the computing section 20. Further, in this embodiment, the offset is added to the parameter signal as in the first embodiment, but the offset may not be added in some cases, and as described in connection with the first embodiment. Instead of the arithmetic unit 20, a non-linear conversion means may be used.

Although the delay unit 26 is used in this embodiment, various filters such as a low pass filter, a high pass filter and a band pass filter may be used instead of the delay unit 26. Also in this case, the filter may be provided on either the input side or the output side of the arithmetic unit 20. When the low-pass filter is used, the same effect as when the delay unit 20 is used is obtained, and when a filter other than the low-pass filter is used, when the delay unit 20 is used between the pitch detection signal and the parameter signal. A different difference from the resulting delay,
An effect different from the case where the delay unit 20 is used is obtained.

FIG. 6 shows a third embodiment. In this embodiment, the tone color is changed only when a performance such as choking is performed. This embodiment corresponds to the comb filter 10 and the arithmetic unit 2 shown in the first and second embodiments.
It has a filter unit 26 configured in the same manner as 0.

The pitch detection signal detected during the attack is supplied from the pitch register 28 during the attack to the filter unit 26, and the parameter signal based on the pitch detection signal is supplied to the filter unit 26, which corresponds to the parameter signal. A comb filter is set for the frequency characteristics.

The attack register 30 detects the rising of the output sound of the electric guitar by the attack detector 30, and the output signal of the delay 32, which is obtained by delaying the detected signal for a predetermined time, is supplied to the pitch register 28 during the attack as a latch command signal. It In addition, the pitch register 28 during the attack
Is also supplied with a pitch detection signal of the pitch detection unit 34 that detects the pitch of the output sound of the electric guitar for each wave. Therefore, the pitch detection signal detected by the pitch detector 34 during the attack is latched in the pitch register 28 during the attack. However, since it takes some time to determine the input pitch and detect the pitch, the rise detection signal detected by the attack detection unit 30 is delayed by the delay 32 and used as the latch command signal.

As described above, since the pitch at the time of attack is latched by the register 28 and is supplied to the filter section 26, the frequency characteristic of the filter section 20 is always constant from the rising of the digital output sound of the electric guitar. . Therefore, if the pitch of the output sound of the electric guitar changes to a value different from the pitch during attack during the performance, the frequency characteristic of the comb filter does not change, as described in the second embodiment. The spectrum of the electric musical tone signal changes, and the tone color changes.

In addition to the pitch attack, the pitch detector 3
The pitch detected in 4 is supplied to the subtractor 36, and the deviation from the pitch during attack stored in the pitch register 28 during attack is calculated. This deviation is variable via the changeover switch 38, or via the absolute value circuit 40 and the changeover switch 38.
2 is supplied to the slider. This slider is a variable resistor 4
2 to change the ratio of synthesis of the output sound of the electric guitar and the output of the filter unit 26.
The composition ratio changes according to the deviation calculated by the subtractor 36.

Therefore, in the state where the pitch is not changed from that at the time of attack, the deviation calculated by the subtractor 36 is zero, and the slider of the variable resistor 42 slides to the output sound side of the electric guitar. Output only the output sound of the electric guitar.

On the other hand, when the pitch is changed from that during the attack, the output of the filter unit 26 is the tone color of the output sound of the electric guitar processed according to the change in the pitch as described above. Then, the subtractor 36 outputs the deviation between the attack time and the current pitch. Depending on this deviation or the absolute value of this deviation (output of the absolute value circuit 40), the output sound of the electric guitar is output. The output of the filter unit 26, which has processed the timbre, is mixed by the variable resistor 42 and output.

The changeover switch 38 and the absolute value circuit 40
The and are provided not only when the pitch is raised like normal choking, but also when the pitch is lowered like arming or choking down. At the time of down, the selector switch 38 is switched to supply the output of the absolute value circuit 40 to the slider of the variable resistor 42.

The parameter signal supplied to the comb filter used in the filter section 26 of this embodiment may have an offset added thereto as in the first embodiment.
As in the second embodiment, a delay means or the like may be used to eventually delay the parameter signal and supply the parameter signal to the comb filter.

[0038]

As described above, according to the first invention, by providing the deviation adding means in the parameter generating means,
According to the second aspect of the invention, since the parameter generating means is provided with the non-linear converting means, a deviation occurs between the fundamental frequency of the peak frequency of the comb filter and the pitch of the input musical tone signal, which causes the input musical tone signal to have a difference. Since the harmonic components are greatly processed, it is possible to change the timbre and volume when performing a rendition that involves changes in pitch, such as choking, and especially to adjust the timbre and volume by adjusting the deviation amount. You can

Further, according to the third aspect of the invention, by providing the parameter generating means with the delay means, there is a time difference between the change in the pitch and the change in the frequency characteristic of the comb filter. The amount of harmonic components of the input musical tone signal changes, so that the tone color and volume can be adjusted. When performing a rendition that involves a pitch change as in the first invention, the tone color and volume can be adjusted. .

According to the fourth invention, by providing the parameter generating means with the filter means, particularly when a low-pass filter is used as the filter means, the change in pitch and the frequency characteristic of the comb filter are the same as in the third invention. Of the input musical tone signal passing through the comb filter changes, and the tone color and volume can be adjusted. Further, when other filter means is used, the change in pitch and the change in frequency characteristic of the comb-shaped filter, which are different from those in the case where the delay means or the low-pass filter is used, are different from those that change with time. A difference is generated, and an effect different from that of the delay unit or the low pass filter is obtained.

According to the fifth aspect of the invention, the frequency characteristic of the comb filter means is set based on the pitch of the rising edge of the input musical tone signal. Therefore, when the pitch of the input musical tone signal changes, the same as in the first aspect of the invention. Then, a deviation occurs between the input tone signal and the fundamental frequency of the peak frequency of the comb filter means, and the tone color is processed.

[Brief description of drawings]

FIG. 1 is a block diagram of a first embodiment of a musical sound processing apparatus according to the present invention.

FIG. 2 is a waveform diagram of each part of the first embodiment.

FIG. 3 is a block diagram of the second embodiment.

FIG. 4 is a waveform chart of each part of the second embodiment.

FIG. 5 is a block diagram of the third embodiment.

[Explanation of symbols]

 10 Comb Filter 20 Computing Unit (Parameter Generating Unit) 22 Pitch Detecting Unit 26 Delaying Unit 28 Pitch Register (Holding Means) During Attack 30 Attack Detecting Unit (Rise Detecting Means)

Claims (5)

[Claims] 1. A pitch detecting means for detecting the pitch of an input musical tone signal to obtain pitch data, a comb-shaped filter means for inputting the input musical tone signal and forming a tone color thereof, and inputting the pitch data. A parameter generating means for converting the frequency characteristic of the comb filter means into a parameter for setting the frequency characteristic, and the parameter generating means is provided with a deviation adding means for adding a deviation to the pitch data or the parameter. A sound processing device. 2. A pitch detecting means for detecting the pitch of an input musical tone signal to obtain pitch data, a comb-shaped filter means for inputting the input musical tone signal and forming a tone color thereof, and inputting the pitch data. Parameter generating means for converting the frequency characteristic of the comb filter means into a parameter for setting the frequency characteristic, and the parameter generating means is provided with a non-linear converting means for making the relationship between the pitch data and the parameter a non-linear characteristic. Musical sound processing device characterized by 3. A pitch detecting means for detecting the pitch of an input musical tone signal to obtain pitch data, a comb-shaped filter means for inputting the input musical tone signal and forming a tone color thereof, and inputting the pitch data. Parameter generating means for converting the frequency characteristic of the comb-shaped filter means into a parameter for setting the frequency characteristic, and the parameter generating means has delay means for delaying the pitch data or the parameter. apparatus. 4. A pitch detecting means for detecting the pitch of an input musical tone signal to obtain pitch data, a comb-shaped filter means for inputting the input musical tone signal and forming a tone color thereof, and inputting the pitch data. A parameter generating means for converting the frequency characteristic of the comb filter means into a parameter for setting the frequency characteristic, wherein the parameter generating means includes a filter means for filtering the pitch data or the parameter. Processing equipment. 5. A rising edge detecting means for detecting a rising edge of an input musical tone signal, a pitch detecting means for detecting a pitch of the input musical tone signal to obtain pitch data, and an input of the input musical tone signal to form a tone color thereof. Comb-shaped filter means, and parameter generation means for inputting the pitch data and converting it into parameters for setting frequency characteristics of the comb-shaped filter means, wherein the parameter generation means comprises the pitch data or the parameters. And a holding means for holding at the rising edge of the input musical tone signal detected by the rising edge detecting means.