JPS6289997A - Musical sound signal former - 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] [Industrial Application Field] The present invention relates to a musical tone signal forming device, and particularly to an improvement of a musical tone signal forming device that forms musical tones using a frequency modulation method, and is suitable for use in electronic musical instruments. It is.

[Conventional technology]

Conventionally, modulation index information I, carrier frequency information ωe1 and modulation frequency information ωrnt in the audible frequency range are given, and the instantaneous amplitude value e (t) of the frequency modulated signal is determined using these information as follows: e (t) = sin (ωct + I sIBω
There is known a musical tone signal forming device using a frequency modulation method, which calculates the instantaneous amplitude value e(1) based on the equation shown by mt:) ----(t) and uses this instantaneous amplitude value e(1) as a musical tone signal (particularly Publication No. 50-1261106).

By the way, in musical instruments such as pipe organs, the overtone composition of the generated musical tones is different between the high range and the low range, resulting in musical sounds of different tones.

[Problem that the invention seeks to solve]

However, in the above-described musical tone signal forming device, the ratio between the carrier frequency and the modulation frequency (hereinafter referred to as frequency modulation ratio) is ωC:ω.

Because it was set according to only the timbre type, the harmonic composition does not change at all between the high and low ranges of musical tones, and it is different from the natural harmonic composition of a pipe organ, etc., where the harmonic composition differs between the high and low ranges. It has the disadvantage that it is not easy to generate musical tone signals.

The present invention was made in view of these drawbacks, and its purpose is to provide a frequency modulation type musical tone signal forming device,
It is an object of the present invention to provide a musical tone signal forming device capable of forming musical tone signals having different overtone compositions depending on the range of the musical tone signal to be formed.

[Failure to solve the problem]

For this reason, the present invention is designed to change the above-mentioned frequency modulation ratio ωe:ω□ depending on the range of the musical tone signal to be formed.

[Effect]

Musical tone signals having different overtone compositions can be freely generated depending on the range of the musical tone signal to be formed.

[Example] Hereinafter, the present invention will be described in detail based on the illustrated example.

The figure is a block diagram showing an electronic musical instrument equipped with an embodiment of the musical tone signal forming device according to the present invention, which can be roughly divided into keyboard sections 1. Key press detection circuit 21 frequency number memory 31 frequency modulation circuit 4. Tone setting device 5, amplitude control circuit 6, DA
Converter 7. It consists of a sound system 8.

In the figure, when a certain key is pressed on the keyboard section 1, the pressed key detection circuit 2 detects the pressed key and outputs a key code KC corresponding to the pressed key. A key-on signal KON is output to indicate that the

In this case, the key code KC is an octave code OC indicating the octave range of the pressed key and a note code N indicating the note name.
It is composed of C. And this key code KC
is supplied to the frequency number memory 3 as an address signal for reading the frequency number (numerical data) corresponding to the pressed key, and is also supplied to the frequency modulation circuit 4 and amplitude control circuit 6 corresponding to the tonal range of the pressed key. 1. The modulation ratio control information is 2 and as address information for generating amplitude information A (t).

The frequency number memory 3 stores a frequency number F corresponding to the pitch of each key of the keyboard section 1 at each address. Therefore, when the key code KC corresponding to the pressed key is input as an address signal from the pressed key detection circuit 2, the frequency number memory 3 stores the frequency number F corresponding to the pitch of the pressed key.
Output. This frequency number F is supplied to multipliers 40 and 41 in frequency modulation circuit 4.

The multiplier 40 is provided to change the frequency number F, which is the basis for creating the modulation frequency information ωmt, according to the timbre and the range of the pressed key. 1 is input from the memory 420 of the device 42 to the modulation ratio control information.

The multiplier 41 is provided to change the frequency number F, which is the basis for creating the carrier frequency information ωet, according to the timbre and the range of the pressed key, and one of the multiplier inputs generates modulation ratio control information. 2 is input from the memory 421 of the device 42 as the modulation ratio control information.

Here, 1. 2 is a memo as numerical information that corresponds to the tone set in the tone setting device 5 and corresponds to the range of the pressed key! These are the outputs from J 420 and 421, respectively. That is, the memory 420 has a number of memory blocks corresponding to the types of selectable tones, and each memory block has memory addresses corresponding to the number of octave ranges of the keyboard section 1. corresponds to the tone of the memory block,
In addition, 1 is stored in the modulation ratio control information corresponding to the octave range. Further, the memory 421 is similarly configured, and stores 2 in the modulation ratio control information corresponding to the tone color and octave range in each memory address. Therefore, when tone setting information and key code KC are supplied from the tone setting unit 5 to these memories 420 and 421 as an address signal, each memory 420 and 421 receives information corresponding to the set tone and the pressed key. 2 is output to the modulation ratio control information Kj, corresponding to the sound range.

Therefore, in the multipliers 40 and 41, the frequency number F corresponding to the pitch of the pressed key and the modulation ratio control information are set to 1.
By multiplying by 2 and 1, the frequency number changed according to the set tone and the range of the pressed key is multiplied by 1.
2.F is output to F, respectively.

The frequency number changed in this way is 1.F.

K2 and F are supplied to accumulators 43 and 44, respectively.

The accumulator 43 sequentially accumulates 1·F on the frequency number supplied from the multiplier 40 according to the clock pulse φ of a predetermined period, and calculates the accumulated value q XK1·F (q=1+2
．． . Cumulative value qXK2・F(
q=1.2...) is output as carrier frequency information ωat. In this case, the frequency numbers 1.F and 2.F are changed according to the set tone and the octave range of the pressed key, so the accumulators 43 and 44 correspond to the pitch of the pressed key and ,
Different modulation frequency information ωmt and carrier frequency information ωct are output depending on the tone range and set timbre. Note that ωm and ωC of the modulation frequency information ωmt and the carrier frequency information ωat naturally indicate frequencies within the audible frequency range.

Modulation frequency information ωm output from accumulator 43
t is supplied to the sine function memory 45 as an address signal, and carrier frequency information ωct output from the accumulator 44 is supplied to the adder 47.

The sine function memory 45 stores the sine amplitude value sinωt at each sample point phase of the sine waveform-period at each address. Therefore, when the modulation frequency information -t is supplied as an address signal, the instantaneous amplitude value 5IIIωmt of the modulation signal corresponding to the repetition frequency of the information edge t is output. This modulation signal sinωmt is supplied to a multiplier 46.

The multiplier 46 adds modulation index information () to the modulation signal sinωmt.
t) e multiplication, but here, modulation index information r (t
) is provided by the modulation index generator 48. That is, the modulation index generator 48 is supplied with a signal representing the set tone from the tone color setting device 5 and a key code KC representing the pressed key from the key press detection circuit 2 as an address signal, and is also supplied with a key-on signal KON. Then, modulation index information I (t) with time-varying characteristics corresponding to the tone range of the pressed key and the set timbre is output in synchronization with the rise of the key-on signal KON. As a result, the multiplier 46 outputs the time-varying modulated finger expression 1[
I I (t) modulated signal r (t)・sin
ωmt is output. This modulation signal I (t)・sin
ωmt is supplied to an adder 47.

Ka3! The X unit 47 converts the carrier frequency information ωct into a modulation signal I
(t) · sioωmt and outputs the modulated signal. When the information ωat and the signal r (t) · sinωmt are input, they are added, and the added value is used as the modulated frequency information [ωct+I(t)・sinωmt). This modulated frequency information [ωc t + I (
t)·sinωmt:l is supplied to the sine function memory 49 as an address signal.

Like the sine function memory 45 described above, the sine function memory 49 stores the sine amplitude value sinωt at each sample point phase of the sine waveform-period at each address. Therefore,
Modulated frequency information [ωct−+−
t(t)・sinωmt] is supplied as an address signal, this sine function memory 49 stores eo (t) =
sin (ωct + I (t) e sinωm
output a frequency modulated signal e n (t) denoted by t). That is, the first frequency signal (s
inω.

t) is a second frequency signal (sin
A signal e o(t) is obtained which is frequency modulated by ωmt).

Frequency modulation signal e□(1) obtained as above
is supplied to the amplitude control circuit 6 to control the setting of the amplitude value. That is, the frequency modulated signal en(t) is supplied to the multiplier 60, where the vibration information generator 61
It is multiplied by the amplitude setting information A (t) supplied from A (t). In this case, the amplitude setting information A(t)ii is generated from the generator 61 in synchronization with the rise of the key-on signal KOH, and has time-varying characteristics corresponding to the set tone and the range of the pressed key. Therefore, the frequency modulated signal eo(t)
The amplitude value is set based on the amplitude setting information A(1) of the time-varying characteristic corresponding to the set tone color and the range of the pressed key.

The frequency “$ modulation signal e(t) = A (t) ・sin Cωct +
I (t) ・sinGJmt, 1 is the DA converter 7
is converted into an analog signal at the sound system 8.
is supplied and pronounced as musical tones.

Here, modulation frequency information ωmt and carrier frequency information ω
1.F in the frequency number that became the basis for creating ct.

K2・F is 1. in the modulation ratio control information. 2, the notes are changed according to the range of the pressed key. For example, in each octave range of pitches C2 to C7, the modulation ratio control information is set to 1. If the settings are as shown in Table 1 below for a tone with 2 in , the ratio of information ωct and ωmt will be 1:6, 1:5, corresponding to the ratio of 2 in information and 1 in information. 1:
/1. ...and so on, depending on the range of the pressed key.

Table 1 Accordingly, the frequency modulated signal e (t), that is, the musical tone signal e (t), has a harmonic composition that changes depending on the range of the pressed key. That is, it is possible to generate musical tones with different tones depending on the pitch range.

In this embodiment, the modulation ratio control information is 1°K2.
Although both are changed according to the range of the pressed key (the range of the musical tone signal to be formed), only one of them may be changed.

In addition, in the example, the range is divided into octaves, but
Intertone divisions can be set arbitrarily, such as every initial octave, every half octave, every three keys, etc.

Furthermore, in the embodiment, the modulation index information I (t) and the amplitude setting information A (t) are also changed according to the pitch range of the pressed key, but these pieces of information are fixed and do not change according to the pitch range of the pressed key. It may be.

Further, in the embodiments, the present invention has been described as being applied to an electronic musical instrument having a single-tone structure, but it goes without saying that it can also be applied to an electronic musical instrument having a multi-tone structure having a sound generation assignment section.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, it is possible to freely form a musical tone signal with different overtone compositions depending on the range of the musical tone signal to be formed, and it is extremely close to the musical tone generated by a musical instrument such as a pipe organ. It is possible to obtain a natural musical tone.

[Brief explanation of drawings]

The figure is a block diagram showing an electronic musical instrument equipped with an embodiment of the musical tone signal forming device according to the present invention. 1... Keyboard section, 4... Frequency modulation circuit, 6...
...Amplitude control circuit, 42...Modulation ratio control information generator.

Claims (2)

[Claims] (1) Frequency-modulating a first frequency signal in the audible frequency range according to a second frequency signal also in the audible frequency range, and forming a musical tone signal based on the signal obtained by this frequency modulation. A musical tone signal forming device according to the present invention, characterized in that the frequency ratio between the first frequency signal and the second frequency signal is variably controlled depending on the range of the musical tone signal to be formed. (2) The musical tone signal forming apparatus according to claim 1, wherein the variable control of the frequency ratio is made to vary depending on the timbre of the musical tone signal to be formed.