JPS5855987A - Music scale frequency signal generator - 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 The present invention relates to a scale frequency signal generator 11 which can frequency modulate the scale frequency output of an electronic musical instrument at a low frequency of 111 degrees Hf and can apply an effective bi-y-tooth pipe.

Conventionally, it has been common practice to apply vibrato to the scale of the electronic musical instrument, 9ζ, to increase the performance effect of the electronic musical instrument. For this reason, in the past, electronic musical instruments were equipped with a main oscillator and a divider that divided the output frequency of the main oscillator into a plurality of collected scale frequencies, and the scale frequencies were extracted from the divider. Frequency modulation is applied to the main oscillator using a separately prepared vibrato oscillator.
Those constructed to obtain high-effect tubes were widely used. However, with this vibrato circuit, all scale frequencies are cyclically modulated, so when playing a chord, you cannot obtain a beat effect and the sound lacks depth, which is a major drawback. have.

In order to eliminate this drawback, a scale frequency signal generator as shown in FIG.
) 2t - cascaded through rt, *splitter 3s e
The output from each frequency divider of n1 divided by 3% is taken out as a desired scale frequency output via an octave selector 5 in response to an octave designation signal from a scale decoder 4. In order to give a vibrato effect to this scale frequency output, the frequency division number designation data D from the scale decoder 4 is added to and subtracted from the output B- from the vibrato oscillator 6 by an adder/subtractor 7, and the resulting output data D, The TPO20 frequency dividing number is determined according to the following. Therefore, in the case of a multiple tone configuration, the phase of the vibrato will be different for each tone, but it has the disadvantage that a plurality of vibrato oscillators 6 are required) and the price is inevitably high.

It is therefore an object of the present invention to provide a scale frequency generator for an electronic musical instrument, which is capable of frequency modulating each scale frequency independently, especially when it includes a vibrato oscillator when obtaining a large number of scale frequency signals. It's about doing.

Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

FIG. 2 shows a block diagram of an embodiment of a scale frequency signal generator for an electronic musical instrument according to the present invention. This scale frequency signal generator 11 separates the output signal MO from the main oscillator 12 from the scale decoder 13 to which the example information I is input, and the output signals from the scale decoder 13 from the sound generation key information processor. and a signal processing circuit @14 for outputting a desired scale frequency output of 0. In an actual signal generator, a plurality (eight, for example) of the signal processing 11 circuits 14 are prepared, but only one of them is shown in FIG.

To explain the signal processing circuit 14, the output signal MO is a top octave program 2 output signal (TEPO) 15.
The frequency is divided by the frequency division ratio according to the calculation data 9 from the adder/subtractor 16.

The adder/subtractor 16 contains a frequency division number designation data indicating the required division ratio determined by the sound key information processor. D, is input from the scale decoder 13, and vibrato D, which will be described in detail later, is input from the vibrato decoder 17, and both data DT, I) τ.

are added and subtracted, and the result is output as arithmetic data D'f'. Frequency-divided output signal Q from TeP015.

are cascaded frequency dividers ts, 18. ＃＊
a++a 18 Frequency divided by false n1 Each frequency division output Q,,Q
The octave selector 19 is on the Q9.
The octave specification data p! from the n1 scale decoder 13 is input to p! 6), one of the n frequency-divided outputs is selectively output as the scale frequency output O.

A vibrato program counter is provided to determine the required vibrato data based on the frequency divider output. This counter 20 is inputted with the branch output CL% of the branch divider 181B, and this branch output q% is
Here, 9 pieces of note name specification data for scale depuder 13,
The frequency is divided by a division ratio determined according to n. That is, Kara/Ri I
Ha, day! The division ratio is determined by the D-1, and the input rt9 division output q% is divided by the division ratio. Therefore,
The counter outputs a vibrato signal v1 determined according to the key press information at the time as 3-bit digital information. The data DT,a is appropriately set so that the minute result of this counter 20 is about 511g9 degrees.

Therefore, for example, when increasing t51j from Ov note to O6φ note, at the required octave, the frequency is divided by 1/12 to 1
It is determined to be any n up to /22 frequency division.

Color/redistribution works as follows. As shown in an example in FIG. 2, after the counter is reset at time t=tD and the content of the vibrato signal vy becomes 0, When the second pulse is input to the wing after resetting, the content of No. 1 Ma1 becomes 1. Next, the fifth pulse is input, and the content of the 9 o'clock signal v1 changes to 2. In this way, the content of the signal v1 changes sequentially as the pulses are input, and after reset, the nth pulse is input***
At (t!:ts), g of the signal vy returns OK, and this signal M1 is input and sold to the vibrato decoder 17 as 3-bit binary data.

The vibrato decoder 17 is a circuit that operates in response to the input of the signal v1, and outputs vibrato data DT, t- whose contents are, for example, numerical values shown in the table below according to the contents of the signal v1.

'V701234567 9th 1 0 +1 +2 +10
The relationship between -1 -2 -1vy and DT is as above! It is not limited to the relationship shown in IK, but
It is configured to change in various ways according to the pronunciation key information technology, and to change according to the pronunciation key.

As already mentioned, the vibrato data DT1 is input to the adder/subtractor 16), and the contents of the data DT are increased or decreased according to the numerical values shown in the table, and the result is input to the TE P015. Therefore, according to the change in the contents of the data Dτ island, T F
The minute ratio at O15 changes, and as a result, a scale frequency signal in which the scale frequency output 0 is subjected to frequency modulation stL% vibrato is obtained. As can be seen from the above explanation, 111 periods of modulation signals are formed by changing the contents of signal M1 from 0 to 71, so in the above example, in the end, 4 pulses of branch output q% One period of vibrato is applied to the output of It is possible to apply a deep vibrato, so the manufacturing cost is lower than that of conventional circuits)
1 can be significantly reduced.

Furthermore, according to the relationship shown in the table, D, ? for a change in the contents of vy. For example, if you further set the width of change in n, you can apply a deep vibrato, while on the other hand, if you set the width of change further,
If you set IK, it will make a very shallow vibrato and growl. Furthermore, it is easily understood from the above description that if the change width is set to zero, a scale frequency output without vibrato can be obtained.

According to the present invention, as described above, frequency modulation can be applied independently to each scale frequency signal by digital processing without using a vibrato oscillator. To be considered,
It is possible to provide a high-performance, low-priced product that can give a good vibrato effect.

[Brief explanation of drawings]

Fig. 1 is a programmer diagram showing an example of a conventional scale frequency signal generator, Fig. 2 is a block diagram of an embodiment of the present invention, and Fig. 3 is a diagram for explaining the operation of the circuit shown in Fig. 2. It is a timing chart figure. 11. Scale frequency signal generator 12°, main oscillator 13°, scale decoder 14°. Signal processing circuit 15°. Top octave program counter 16°. Adder/subtractor 17°. Vibrato datar 181-18%00 divider 19. Octave selector plus 0. Vibrato program counter MO0, output signal 01. Scale frequency output DT 1 mm calculation data DT-. 0 frequency division number designation data DT @*L vibrato data DT, , octave designation data DT, , pitch name designation data VF , , vibrato signal. that's all

Claims (1)

[Claims] 1. A main oscillator, a program counter for dividing the output signal from the main oscillator, a frequency divider for dividing the output signal from the program counter, and digital processing of the output from the frequency divider. means for determining the vibrato information and therefore the division ratio of the program counter, thereby obtaining a desired scale frequency signal with vibrato.
A scale frequency signal generator featuring several features.