JPS584153Y2 - Tone circuit of electric string instrument - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a timbre circuit for an electric stringed musical instrument that can arbitrarily change the timbre.

The musical sound signal obtained by plucking a string is a decaying sound whose volume decreases and disappears over time, and its timbre changes are also characteristic, but it is possible to add various timbre changes to such musical sound signals. If possible, it will be useful for performance effects.

The present invention provides an electric stringed instrument in which the timbre and volume change envelope of the electric stringed instrument can be arbitrarily controlled.

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram of a tone circuit for an electric stringed instrument showing an embodiment of the present invention.

One timbre circuit is provided independently for each string.

The input terminal 1 receives a musical tone signal as shown in FIG. 2, which is converted independently from the string vibration caused by plucked strings, as shown in FIG. The signal is then converted into a continuous musical tone signal as shown in FIG. 2 and output to point a.

The musical tone signal output to the above point a is the gate signal forming circuit 2.
A gate signal having a waveform as shown in FIG. 2 and 3 is output at point b, but the gate signal is output only during the period in which the attenuating musical tone signal shown in FIG. 2 and 1 exists.

The envelope signal generating circuit 4, which receives the gate signal outputted to point b, generates an arbitrarily set signal, for example, as shown in FIG.
An envelope signal such as the following is generated and applied to the control signal input terminal 51 of the envelope adding circuit 5 only during the period in which the gate signal exists.

The envelope adding circuit 5 is inputted with a musical tone signal as shown in FIG. A musical tone signal like this is output.

This musical tone signal is obtained by adding the envelope of FIG. 24 to the musical tone signal of FIG. 2.

In addition, from the input terminal I, the peak value vA in FIG. 21 or v
The peak hold circuit 3 to which the musical tone signal B is input holds the peak value VA t of the input musical tone signal only during the period when the gate signal appearing at the above point is applied as a control signal.
2 or vB, a signal as shown in FIG. 2 appears at the 0 point as the output signal of the peak hold circuit 3.

The musical tone signal outputted to the above point d (FIG. 2) has a constant amplitude regardless of the strength of plucking, that is, the magnitude of the amplitude value of the musical tone signal input from the input terminal (2), and is not interesting in terms of performance effect. The second signal appearing at the zero point having an amplitude proportional to the amplitude value of the musical tone signal is sent to the volume control circuit 6 and is distorted.
By applying a control signal as shown in FIG. 6 to the control signal input terminal 61 of the volume control circuit 60, the musical tone signal shown in FIG.
undergoes a change in amplitude in accordance with the peak values VA and VB of the control signal, and a musical tone signal as shown in FIG. It is taken out from the output terminal O as a signal.

The musical tone signal in FIG. 2 7 obtained from the above output terminal 0 is the musical tone signal in FIG. 2 2 added with the envelope in FIG. It has more tonal components and volume changes than the
It is a musical sound signal that can give a wide variety of timbre changes, and like the musical sound signal input from the above input terminal (■), the plucked volume changes depending on the strength of the plucking, so it does not lose its characteristics as a stringed instrument. There is no musical tone signal.

Note that the envelope force 0 and the waveform shaping circuit 1
It goes without saying that if a timbre adjustment circuit is interposed between the two, even more various timbre changes can be obtained.

As described above, the present invention has a richer tone and a variety of volume change envelopes other than a simple attenuation envelope from the musical sound signal obtained by an electric stringed instrument, and also has a volume change depending on the strength of the plucked strings. To provide a tone circuit for an electric stringed instrument that outputs a musical tone signal having the same characteristics as a stringed instrument without losing its characteristics as a stringed instrument.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a tone color circuit of an electric stringed instrument showing an embodiment of the present invention, and FIG. 2 is a diagram for explaining the operation of the circuit shown in FIG. ...Input terminal, O...Output terminal, 1.
... Waveform shaping circuit, 2 ... Gate signal forming circuit, 3 ... Peak hold circuit, 4 ...
... Envelope signal generation circuit, 5 ... Envelope addition circuit, 6 ... Volume control circuit, 5i
, 6i... Control signal input terminal, a. b , c , d... Desire in the circuit.

Claims (1)

[Scope of utility model registration request] A waveform shaping circuit that uses a musical tone signal converted from string vibration caused by plucked strings as an input signal and amplifies the musical tone signal by 1 to a saturated state, and uses an output signal of the waveform shaping circuit as an input signal only during the period when the musical tone signal exists. a gate signal forming circuit that generates a gate signal; an envelope signal generating circuit that uses the gate signal as an input signal to generate an arbitrary envelope signal; and an envelope signal generating circuit that uses the envelope signal as a control signal to apply an envelope to the musical tone signal output from the waveform shaping circuit. an envelope addition circuit that adds the input musical tone signal; a peak hold circuit that holds the peak value of the input musical tone signal as a DC voltage;
a volume control circuit that controls the volume of the output signal of the envelope adding circuit using the output signal voltage of the hold circuit as a control signal, and shapes the waveform of the input musical tone signal;
A tone circuit for an electric stringed instrument characterized by adding an arbitrary envelope and at the same time changing the amplitude according to the strength of plucking.