JPS6147432B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an effect circuit for an electronic musical instrument in which a chorus effect circuit and a flange effect circuit are constructed of a relatively small number of parts.

Conventionally, in electronic musical instruments such as electronic organs, effect circuits, especially a circuit called a chorus effect circuit, are often used to obtain a sound with a spacious feel by applying phase modulation to the generated musical tones. Summer. FIG. 1 is a block diagram showing an example of a conventional chorus effect circuit, in which a musical tone from a musical tone signal input terminal 1 is passed through a first low-pass filter 2 to a typical bucket brigade type charger as a phase modulation element. The phase-modulated output applied to the transfer element 3 (hereinafter abbreviated as BBD in this specification) reaches one input end of the addition element 5 via the second low-pass filter 4 . The musical tone from the musical tone signal terminal 1 directly reaches the other input terminal of the adding element 5, and is added to the output of the second filter 4. Further, the oscillation frequency of the voltage-controlled oscillator 7 to which the output of the resistive frequency oscillator 6 is applied is made variable and serves as a modulation signal for the BBD 3. By adding the phase-modulated signal and the original signal in this manner, a sound effect called a chorus effect is obtained. Incidentally, FIG. 2 is a block diagram showing an example of a flange effect circuit, and the same reference numerals as in FIG. 1 indicate the same parts. In this case, the addition element 5 is inserted between the musical tone signal input terminal 1 and the first filter 2. The oscillation frequency of the voltage-controlled oscillator 7 is made variable by the output of the low-frequency oscillator 6, and the modulation signal for the BBD 3 is the same as in FIG. 1, but the position of the adding element 5 is different from that in FIG. A flange effect different from a chorus effect can be obtained.

Recently, in order for more people to utilize electronic musical instruments effectively, single-piece effect circuits called effectors using miniaturized electronic components have become commercially available. Although it is preferable to combine various effect circuits such as a chorus effect circuit into a single case because it can give complex effects to musical sounds, it is preferable to combine various effect circuits such as a chorus effect circuit into a single case. Since the phase modulation element itself is expensive and requires an oscillator to drive it, it has the disadvantage that configuring it by combining a large number of effect circuits inevitably becomes expensive and expensive.

SUMMARY OF THE INVENTION The object of the present invention is to improve the above-mentioned drawbacks and to provide an effect circuit for an electronic musical instrument that can switch between a flange effect circuit and a chorus effect circuit using only a relatively small number of components.

Embodiments of the present invention shown in the drawings will be described below. FIG. 3 is a block diagram showing the configuration of the first embodiment of the present invention, and the same reference numerals as in FIGS. 1 and 2 indicate the same parts. 5-1 and 5-2 are adder elements, respectively, 11-1 and 11-2 are third filters, and each of the first and second filters is
This shows what interconnects the terminals on the opposite side of the terminals connected to BBD3. Reference numerals 13 and 14 denote switching switches, which are respectively connected in series with the two third filters and are interlocked so that they operate in opposite directions. When 13 is closed and 14 is open, it operates as a flange effect circuit, and when 13 is open and 14 is closed, it operates as a chorus effect circuit. Further, the filter 11-1 is designed to be suitable for obtaining a flangier effect, and the filter 11-2 is designed to be suitable for obtaining a chorus effect tone. Also, as the type of filter, any of high-pass, band-pass, and low-pass can be designed and used as appropriate;
1 is particularly suitable for emphasizing the high frequency range and cutting the low frequency range so as not to cause discomfort to the listener.

Next, FIG. 4 is a block diagram showing the configuration of a second embodiment of the present invention, in which 15, 16, 17, and 18 are interlocking switching switches, and 2-1 and 4-1 are selected to be suitable for a flange effect circuit. low pass filter, 2-
2 and 4-2 are low-pass filters selected to be suitable for the chorus effect circuit. Note that filter 1
1 connects both ends of the low-pass filters 2-1, 4-1, etc., and since it is common to both the flange effect and chorus effect circuits, it has bidirectional characteristics and characteristics suitable for obtaining each effect. Select something. When the switching switch is in the position shown, it becomes a flange effect circuit, and when it is in the opposite position as shown, it becomes a chorus effect circuit.

Next, FIG. 5 is a block diagram showing the configuration of a third embodiment of the present invention, in which two low frequency oscillators 6-1 and 6-2 are provided. 19 is one of the interlocking switching switches for switching the low frequency oscillator output. For example, oscillator 6
The frequency of the oscillator 6-1 is selected to be optimal for the flangier effect circuit, the frequency of the oscillator 6-2 is selected to be optimal for the chorus effect circuit, and the filter 11 is selected to have bidirectional characteristics as in the second embodiment. .

Charge-coupled transfer device as a phase modulation device
A CCD can also be used.

In this way, according to the present invention, both the chorus effect circuit and the flange effect circuit can be constructed with a small number of elements by simply selecting the switching switch and the elements directly related thereto.Moreover, since the phase modulation element is single, the musical tone can be The circuit is inexpensive and lightweight, and the switching operation is easy.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a conventional chorus effect circuit, FIG. 2 is a block diagram showing an example of a flange effect circuit, and FIG. 3 is a block diagram showing an example of a flange effect circuit.
FIG. 4 and FIG. 5 are block diagrams showing the configuration of the second and third embodiments of the present invention. 1...music signal input terminal, 2, 2-1, 2-2,
4, 4-1, 4-2...Low pass filter, 3...
BBD element, 5, 5-1, 5-2... addition element,
6, 6-1, 6-2...Low frequency oscillator, 7...Voltage controlled oscillator, 11-1, 11-2...Third filter, 13, 14, 15, 16, 17, 18, 19
...Switch switch.

Claims (1)

[Claims] 1. One phase modulation element for a musical tone, a low frequency oscillator that drives the phase modulation element, and first and second oscillators each having one end connected to a signal input/output terminal of the phase modulation element. In an effect circuit for an electronic musical instrument equipped with a filter, each component is selectively connected to a third filter that is connected directly or via an addition element between terminals that are not connected to the phase modulation element of the first and second filters. and a switching switch, the switching switch is configured to add the input signal of the first filter to the output of the second filter via the third filter when obtaining a chorus effect, and to add the input signal of the first filter to the output of the second filter when obtaining a flange effect. An effect circuit for an electronic musical instrument, characterized in that the output of the second filter is switched to be added to the input of the first filter via a third filter.