JPH0451295A - Tone control device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an effector for an electronic musical instrument, and particularly to a timbre control device that can arbitrarily control the timbre of various musical tone signals.

[Conventional technology]

In recent years, with the advancement of digital technology, various effectors have been proposed, and tone control devices that can produce even more diverse tones are being considered.

A conventional timbre control device will be described below with reference to the drawings.

FIG. 8 shows the configuration of a conventional timbre control device.

In FIG. 8, 81 is a multiplier, 82 is an input waveform signal α
83 is a waveform converter that converts the amplitude of the waveform signal a output from the multiplier 81.

The operation of the timbre control device configured as described above will be explained below.

First, the multiplier 81 multiplies an input waveform signal α such as a musical tone sequentially outputted from an electronic musical instrument or the like by an amplitude control signal outputted from the amplitude instruction section 82, and the resulting waveform signal a
are sequentially output to the waveform converter 83.

Here, the amplitude instruction section 82 can control the amplitude of the waveform signal a by arbitrarily changing the amplitude control signal.

Next, the waveform converter 83 converts the waveform signal a that is sequentially input.
The amplitude of the signal is converted according to predetermined input/output characteristics, and the resulting waveform signals are sequentially output as output waveform signals.

Note that the waveform converter 83 has a configuration as shown in FIG. 9, for example.

The waveform signal a that is sequentially input to the waveform converter 83 is input to the code controller 91 . The sign control unit 91 temporarily stores O if the sequentially inputted waveform signal a has a positive value, and l if it has a negative value, and stores the value of the waveform signal a excluding the sign information, i.e. The absolute value is determined, and the conversion table 92 having the input/output characteristics shown in FIG. 10, for example, is referred to using that value as an address. Then, the code control section 9
1 reads the amplitude corresponding to the address, which is the absolute value of the waveform signal a, from the conversion table 92, and then sequentially outputs a signal to which stored code information is added, that is, a waveform signal A, as an output waveform signal.

As explained above, the waveform signals a that are sequentially input to the waveform conversion section 83 are amplitude-converted by the predetermined conversion table 92, and then sequentially output as waveform signals.

Note that by arbitrarily changing the amplitude control signal output from the amplitude instruction section 82, the level of the waveform signal a can be changed, so that the waveform conversion section 83 can obtain output waveform signals of different tones.

[Problem to be solved by the invention]

However, in the conventional configuration described above, the waveform signal a is replaced by a completely different waveform signal S by the conversion table 92, and not only the timbre of the input waveform signal α is not reflected, but also the output waveform signal is simply converted by the conversion table 92. Therefore, even if the amplitude control signal was changed by the amplitude instruction section 82, a sufficient change in tone could not be obtained.

Furthermore, it is conceivable to prepare multiple conversion tables according to the tone and select them to obtain multiple tones, but in this case, there is a problem that memory for the number of conversion tables is required and the circuit size increases. Ta.

An object of the present invention is to provide a timbre control device that can output complex tones with a simple configuration without increasing the circuit scale.

[Means to solve the problem]

The timbre control device according to claim (1) includes a filter section, a feedback amount control section, and a waveform conversion section. The filter part is
It has a feedback loop and a delay element, and receives waveform signals such as musical tones. The feedback amount control section controls the feedback amount of the feedback signal of the feedback loop. The timbre control device according to claim (2), wherein the waveform converting section is connected within the feedback loop of the filter section and characterizes the amplitude of the feedback signal, includes a filter section, a modulation waveform generating section, and a modulation section. The filter section has a feedback loop and a delay element, and receives a waveform signal such as a musical tone. The modulated waveform generator generates a modulated waveform signal.

The modulation section is connected within the feedback loop of the filter section and performs modulation using the feedback signal and the modulation waveform signal.

The timbre control device according to claim (3) includes a filter section, a modulation waveform generation section, an amplitude control section, a feedback amount control section, and a modulation section. The filter section has a feedback loop and a delay element, and receives a waveform signal such as a musical tone. The modulated waveform generator generates a modulated waveform signal. The amplitude control section controls the amplitude of the modulated waveform signal. The feedback amount control section controls the return amount of the feedback signal of the feedback loop. The modulation section is connected within the feedback loop of the filter section, and performs modulation using the feedback signal and the amplitude-controlled modulation waveform signal.

[Effect]

According to the configuration described in claim (1), the waveform signals input to the filter section are sequentially output, and the waveform conversion section in the feedback loop converts the amplitude of the feedback signal, so that the feedback signal fed back by the feedback loop is By controlling the feedback amount by the feedback amount control section, an output waveform signal including a harmonic spectrum can be obtained.

According to the configuration described in claim (2), by sequentially outputting the waveform signal input to the filter section, and performing modulation in the modulation section using the modulation waveform signal output from the modulation waveform generation section and the feedback signal. , it is possible to obtain an output waveform signal containing a harmonic spectrum.

According to the configuration described in claim (3), by sequentially outputting the waveform signal input to the filter section and performing modulation in the modulation section using the modulated waveform signal input into the feedback loop and the feedback signal, Further, by controlling the amplitude of the modulated waveform signal with the amplitude control section and further controlling the feedback amount of the feedback signal with the feedback amount control section, it is possible to obtain an output waveform signal including a harmonic spectrum.

〔Example〕

FIG. 1 shows a block diagram of a tone control device according to a first embodiment of the present invention.

In FIG. 1, 11 is a filter section, 12 is an adder that adds or subtracts the input waveform signal α and the feedback signal d, and 13
14 is a delay unit that delays the waveform signal by one sample clock or more, and 14 is a feedback amount control unit that controls the amount of feedback of the feedback signal e. Further, 83 is a waveform converter, which has the same configuration as the conventional one.

The filter unit 11 operates as a low-pass filter when the adder 12 performs addition, and operates as a bypass filter when the adder 12 performs subtraction.

The operation of the timbre control device configured as described above will be described below.

First, when an input waveform signal α such as a musical tone is input to the filter section 11, the adder 12 inputs the input waveform signal α input sequentially.
and the feedback signal d, and the results are sequentially sent to the delay section 13. At this time, the output waveform signal β is O, so the feedback signals e and cd are zero.

Next, the delay section 13 is composed of a latch and the like, and after performing a time delay process of one sample clock or more on the successively inputted addition results, it sequentially outputs the results as an output waveform signal β. On the other hand, the waveform signal output from the delay section 13 is also sent to the feedback amount control section 14 as a feedback signal e.

The feedback amount control section 14 has a configuration as shown in FIG. 4, for example. Here, the feedback amount control section 14 multiplies the feedback signal e input sequentially by the feedback amount instruction signal output from the feedback amount instruction section 41 using the multiplier 42 .

The results are sequentially sent to the waveform converter 83 as a feedback signal C.

The waveform converter 83 has a configuration as shown in FIG. 9, for example, as in the prior art. For example, if the feedback signal C input sequentially is a positive value, the sign control unit 91 outputs O, and if it is a negative value, the code controller 91 outputs 1.
is temporarily stored as code information, and the value of the feedback signal C excluding the code information, that is, the absolute value, is obtained, and the value is used as an address to read the amplitude corresponding to that address from the conversion table 92, and then - time is stored. The signal to which the code information has been added is sequentially sent to the adder 12 as a feedback signal d. Note that the method for calculating the absolute value is already known;
The method is not particularly limited, and
- Regarding the method of adding code information stored at the time, for example, if the code information is a positive value using a multiplier etc., l
If it is a negative value, it can be multiplied by -1.

The feedback signal d output from the code control section 91 is sent to the adder 1
2, it is added to the input waveform signal α that is input sequentially, and the result is sent to the delay unit 13 again.

By repeating the above operations, a waveform as shown in FIG. 5, for example, can be obtained as the output waveform signal β.

FIG. 5 shows the case where a sine wave is used as the input waveform signal α, where (a) the feedback amount (-feedback signal C/feedback signal e) is O, and (b) the feedback amount is 0. When it is 5, (C)
shows the output waveform signal β when the feedback amount is 0.8.

Further, the conversion table 92 has a configuration as shown in FIG. 10 as in the past, and when the absolute value of the input feedback signal C is small, the amplitude according to the address near the A section of the conversion table 92 is read. If the absolute value is large, the amplitude according to the address near the D interval is read out.

Incidentally, in the conversion table 92, the amplitude corresponding to the address in the D interval is constant and relatively small. This is because the feedback signal d converted by the conversion table 92 is added to the input waveform signal α and then input to the waveform converter 83 again as the feedback signal C. Instruction signal or conversion table 92
Depending on the characteristics of the feedback signal C, the feedback signal C may repeatedly increase.
This prevents a so-called oscillation state in which the address exceeds the address of .

As described above, according to the first embodiment, the input waveform signal α that is input sequentially is outputted via the delay section 13, and
After controlling the feedback amount, that is, the amplitude of the feedback signal e that is sequentially fed back by the feedback loop, by the feedback amount control section 14,
The value of the amplitude-controlled feedback signal C is converted by the waveform conversion section 83, and a signal obtained by adding the resulting feedback signal d and the input waveform signal α is output to the delay section 13, so that the obtained It is possible to bring about a change in the timbre of the output waveform signal β.

Further, by changing the amplitude of the feedback signal C over time by the feedback amount control section 14, the tone color of the output waveform signal β can be changed over time.

11! FIG. 2 shows a block diagram of a tone control device according to a second embodiment of the present invention.

In FIG. 2, 21 is a modulation waveform generation section that generates a modulation waveform signal i, and 22 is a modulation section that performs modulation using the feedback signal f and the modulation waveform signal i.

Note that the filter section 11. The adder 12 and the delay section 13 have the same configuration as in the first embodiment.

The operation of the timbre control device configured as described above will be described below.

First, when an input waveform signal α such as a musical tone is input to the filter section 11, the adder 12 sequentially inputs the input waveform signal α.
and the feedback signal g, and the results are sequentially sent to the delay section 13. At this time, the output waveform signal β is 0, so the feedback signals f and g are O.

Next, the delay unit 13 is composed of a latch and the like, and after performing a time delay process of one sample time or more on the successively inputted addition results, it sequentially outputs the results as an output waveform signal β. On the other hand, the waveform signal output from the delay section 13 is also sent to the modulation section 22 as a feedback signal f.

The modulation section 22 has a configuration as shown in FIG. 6, for example. Here, the modulating section 22 multiplies the feedback signal f that is sequentially inputted and the modulated waveform signal i that is output from the modulated waveform generating section 21 using the multiplier 61, and sequentially outputs the result as the feedback signal g.

The feedback signal g sequentially output from the modulator 22 is sent to the adder 12.
The input waveform signal α is added to the input waveform signal α that is input sequentially, and the result is sent to the delay unit 13 again.

As a waveform generation method of the modulated waveform generator 21, for example, a so-called waveform readout method in which modulated waveform data stored in advance is sequentially read out can be considered, and among these methods, it is possible to simplify the hardware such as the timing of the summer season. Therefore, it is preferable to use a so-called fixed clock method, in which addresses are sequentially read out while incrementing addresses in accordance with a set modulation waveform frequency based on a fixed readout clock.

As described above, according to the second embodiment, the input waveform signal α that is input sequentially is outputted via the delay section 13, and
A signal obtained by modulating a feedback signal f that is sequentially fed back by a feedback loop and a modulating waveform signal i that is sequentially output from a modulating waveform generating section 21 by a modulating section 22, and adding the resulting feedback signal g and an input waveform signal α. Since the output waveform signal α is outputted to the delay section 13, it is possible to obtain an output waveform signal β containing harmonic components according to the frequency difference between the input waveform signal α and the modulated waveform signal i.

Furthermore, by changing the frequency of the modulated waveform signal j over time, the timbre of the output waveform signal β can be changed over time.

Figure 3 shows a block diagram of a tone control device according to a third embodiment of the present invention.

In FIG. 3, reference numeral 31 denotes an amplitude control section that controls the amplitude of the modulated waveform signal l sequentially generated from the modulated waveform generating section 21. Note that the filter section 11. Summer heater 12. Delay section 13
．． The modulation waveform generation section 21 and the modulation section 22 have the same configuration as in the second embodiment.

Further, the feedback amount control section 14 has the same configuration as the first embodiment.

The operation of the timbre control device configured as described above will be described below.

First, when an input waveform signal α such as a musical tone is input to the filter section 11, the adder 12 inputs the input waveform signal α input sequentially.
and the feedback signal are added, and the results are sequentially sent to the delay section 13. At this time, the output waveform signal β is O, so the feedback signals e and c.

h is 0.

Next, the delay section 13 is composed of a lunch circuit, etc., and after performing a time delay process of one sample clock or more on the sequentially inputted addition results, sequentially outputs the results as an output waveform signal β. On the other hand, the waveform signal output from the delay section 13 is also sent to the feedback amount control section 14 as a feedback signal e.

The feedback amount control section 14 has a configuration as shown in FIG. 4, for example, similarly to the first embodiment. Here, the feedback amount control unit 14 multiplies the feedback signal e input sequentially by the feedback amount instruction signal output from the feedback amount instruction unit 41 using the multiplier 42,
The results are sequentially sent to the modulation section 22 as feedback signals C.

By the way, the modulated waveform generator 21 sequentially reads out predetermined modulated waveform data at addresses corresponding to arbitrarily set frequencies, and then sequentially sends them as the modulated waveform signal 1 to the amplitude controller 31.

The amplitude control section 31 has a configuration as shown in FIG. 7, for example. The amplitude instruction section 71 outputs an amplitude control signal for controlling the amplitude of the modulated waveform signal i. Further, in the amplitude control section 31, a multiplier 72 multiplies the amplitude control signal and the modulated waveform signal i input sequentially, and the result is used as the modulated waveform signal j.
Send sequentially as .

The modulation section 22 has a configuration as shown in FIG. 6, for example, similarly to the second embodiment. Here, the modulating section 22 multiplies the feedback signal C that is sequentially inputted and the modulated waveform signal j that is sequentially output from the amplitude control section 31 using the multiplier 61, and sequentially outputs the result as a feedback signal.

The feedback signals sequentially output from the modulator 22 are sent to the adder 12.
is added to the human input waveform signal α which is inputted sequentially, and the result is sent to the delay unit 13 again.

As described above, according to the third embodiment, the input waveform signal α that is input sequentially is outputted via the delay unit 13, and
The feedback signal C that is sequentially fed back by the feedback loop and the modulated waveform signal j that is sequentially output from the modulated waveform generating section 21 and whose amplitude is controlled are modulated by the modulating section 22, and the resulting feedback signal and the input waveform signal are modulated by the modulating section 22. Since the signal obtained by adding the input waveform signal α and the modulated waveform signal j is outputted to the delay unit 13, the output waveform signal contains harmonic components according to the frequency difference between the input waveform signal α and the modulated waveform signal j and the amplitude of the modulated waveform signal j. β can be obtained.

In addition, the frequency and amplitude of the modulated waveform signal j and the feedback signal C
By changing one or more of the amplitudes over time, the timbre of the output waveform signal β can be changed over time.

〔Effect of the invention〕

In the timbre control device according to claim (1), the waveform converter and the feedback amount controller are arranged in a feedback loop, and the amplitude of the feedback signal sequentially input to the waveform converter is controlled by the feedback amount controller. With a simple configuration, an output waveform signal including a complex harmonic spectrum can be obtained, and a complex tone can be output.

In the timbre control device according to claim (2), the modulation section is arranged in a feedback loop, and the modulation section performs modulation using the modulation waveform signal output from the modulation waveform generation section and the feedback signal. With this configuration, an output waveform signal containing a complex harmonic spectrum can be obtained, and a complex tone can be output.

In the timbre control device according to claim (3), a modulation section, an amplitude control section, and a feedback amount control section are disposed in a feedback loop, and the modulation section has a modulation waveform signal and a feedback signal input into the feedback loop. By performing modulation, by controlling the amplitude of the modulated waveform signal with the amplitude control section, and further controlling the feedback amount of the feedback signal with the feedback amount control section, complex harmonics can be achieved with a simple configuration. An output waveform signal containing a wave spectrum can be obtained, and complex tones can be output.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a timbre control device according to a first embodiment of the invention, FIG. 2 is a block diagram of a timbre control device according to a second embodiment of the invention, and FIG. 3 is a block diagram of a timbre control device according to a second embodiment of the invention. FIG. 4 is a block diagram showing the feedback amount control section in the first and third embodiments; FIG. 5 is an output waveform signal in one embodiment of the present invention; FIG. is a block diagram showing the modulation section in the second and third embodiments, FIG. 7 is a block diagram showing the amplitude control section in the third embodiment, and FIG. 8 is a block diagram of a conventional timbre control device.
FIG. 9 is a block diagram showing a waveform converter in a conventional example;
FIG. 10 is an input/output characteristic diagram of a conversion table of a waveform converter in a conventional example. 11... Filter section, 12... Adder, 13...
Delay section, 14... Feedback amount control section, 21... Modulation waveform generation section, 22... Modulation section, 31... Amplitude control section, 8
3...Waveform converter 1 Figure 3 Figure (a) Figure 3

Claims (3)

[Claims] (1) A filter section that has a feedback loop and a delay element and receives a waveform signal such as a musical tone; a feedback amount control section that controls the amount of feedback of the feedback signal of the feedback loop; and within the feedback loop of the filter section. and a waveform converter connected to the feedback signal to convert the amplitude of the feedback signal. (2) a filter section having a feedback loop and a delay element, into which a waveform signal such as a musical tone is input; a modulation waveform generation section generating a modulation waveform signal; connected within the feedback loop of the filter section; A timbre control device comprising a modulation section that performs modulation using a signal and the modulated waveform signal. (3) a filter section having a feedback loop and a delay element and inputting a waveform signal such as a musical tone; a modulation waveform generation section generating a modulation waveform signal; and an amplitude control section controlling the amplitude of the modulation waveform signal; a feedback amount control section that controls the feedback amount of the feedback signal of the feedback loop; and a modulation section that is connected within the feedback loop of the filter section and performs modulation using the feedback signal and the amplitude-controlled modulated waveform signal. Tone control device with.