JPS6224313Y2 - - Google Patents

Description

[Detailed explanation of the invention] In conventional electronic organs, by inserting the headphone plug into the headphone jack, the musical tone signal passing circuit connected to the tone circuit and keyboard circuit is switched from the speaker circuit to the headphone circuit. Generally, it is configured so that the musical tones can be heard. However, if the player listens to the performance through a headphone, he or she cannot hear the tremolo or chorus sound effects obtained by rotating the speaker or the fan in front of the speaker. Therefore, this is inconvenient when practicing playing an electronic organ using a headphone. The present invention aims to eliminate this disadvantage.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic electrical circuit diagram of an embodiment of the present invention. Reference numeral 1 indicates a switch that closes a circuit to be described later by inserting a plug 5 of a headphone 4 into a jack 6. By inserting the headphone into the headphone 4, the musical tone signal passing circuit 2 is operated in conjunction with a switch 9 which switches the musical tone signal passing circuit 2 from the circuit for the speaker 7 and the tremolo or chorus effect speaker 8 to the circuit for the headphone 4. Reference numeral 2 denotes a musical tone signal passing circuit connected to a tone color circuit and a keyboard circuit (not shown), and a musical tone signal delay time modulation circuit 3 is interposed in this circuit. This musical tone signal delay time modulation circuit 3 is constructed as described later, and when the switch 1 is closed, it changes the phase of the musical tone signal to form a tremolo or chorus sound effect signal.

Now, when you play the electronic musical instrument under the illustrated state, you can hear the normal playing sound from the speakers 7 and 8, and when you close the tremolo effect switch 11, the switch unit 11 of the switch 11
The motor M ₁ rotates via a, and the motor M ₁ rotates the fan (acoustic reflection plate) F, so that a tremolo sound effect is emitted from the speaker 8. When the chorus effect switch 12 is closed, the motor M ₂ rotates more slowly than the motor M ₁ , and the motor M ₂ rotates the fan F, so that a chorus effect sound is emitted from the speaker 8 . When the plug 5 of the headphone 4 is inserted into the jack 6, the switch 9 switches to the headphone 4 circuit, and then when the tremolo effect switch 11 is closed, the switch 1 is connected to the terminal _t1 of the musical tone signal delay time modulation circuit 3. , a tremolo effect control signal is applied via the switch unit 11b, the circuit changes the phase, a tremolo effect signal is output from the amplifier 18, and the chorus effect switch 1
2, a chorus effect control signal is applied to the terminal _t2 of the musical tone signal delay time modulation circuit 3 via the switch 1 and the switch unit 12b, a chorus effect signal is output from the amplifier 18, and both are applied to the headphone 4. You can hear tremolo or chorus sound effects.

FIG. 2 shows a block diagram of an example of the musical tone signal delay time modulation circuit 3, which includes a delay unit 13, a low-pass filter 14, a gate 15, and a tremolo modulation oscillator 16. It is composed of a control circuit 17. The delay unit 13 consists of, for example, a bucket brigade device (hereinafter referred to as BBD), and has a clock generator that generates two-phase clock pulses to operate the BBD.
14 is a low pass filter for removing sampling frequency components; 15 is a gate that opens when the tremolo or chorus effect switches 11 and 12 are closed; The integrating circuit 16a integrates the flag voltage from the Schmitt circuit 16b according to an integration constant, and the Schmitt circuit 16b receives the integrated triangular wave voltage and generates a rectangular wave voltage (flag voltage).
is generated and returned to the integrating circuit, and oscillates at a frequency determined by the integration constant and the threshold voltage setting of the Schmitt circuit 16b (approximately 6.3 Hz during tremolo and approximately 0.8 Hz during chorus). 17 is a control circuit, which includes a tremolo or chorus effect switch 11;
When a control signal is applied to terminal t ₁ or t ₂ by closing 12, the tremolo modulation oscillator 16 oscillates, and during tremolo, the oscillation frequency increases.
When the oscillation frequency is 6.8Hz and chorus is about 0.8Hz, the integral constant is changed, and when the tremolo effect switch 11 is closed, the integral constant changes gradually via the time constant circuit. .
Thus, the clock frequency of delay unit 13 is modulated by the frequency of tremolo modulation oscillator 16, and the input signal is
By passing through the tremolo effect switch 11, the phase is shifted in opposite directions such as 0° and 180°, making it possible to create a sense of sound rotation between the two channels. Also, when the tremolo effect switch 11 is closed, When switching from the tremolo effect to the chorus effect, an effect similar to the rotational movement of a mechanical tremolo unit can be obtained.

Note that the musical tone signal delay time modulation circuit 3 is not limited to the illustrated embodiment. In the embodiment shown in the first figure, the motors M ₁ and M ₂ rotate the fan F, but they may also rotate the speaker 8. As described above, according to the present invention, even when a headphone plug is inserted into a jack and a performer is listened to through the headphone, as a result of intervening a musical tone signal delay time modulation circuit in a musical tone signal passing circuit, tremolo or chorus effect sound can be generated. Since the player can listen to the music, this has an advantageous effect in practicing playing the electronic organ.

[Brief explanation of the drawing]

FIG. 1 is a schematic electrical circuit diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of an example of a musical tone signal delay time modulation circuit. 1, 9... switch, 2... musical tone signal passing circuit, 3... musical tone signal delay time modulation circuit, 4... headphone, 5, 6... plug, jack, 7,
8... Speaker, 10... Resistor, 11, 12...
Tremolo, chorus effect switch, 13...Delay unit, 14...Low pass filter, 15...
Gate, 16...Tremolo Modulation
Oscillator, 17...control circuit.

Claims (1)

[Scope of utility model registration request] An electronic musical instrument comprising a speaker, a headphone, and a tremolo or chorus effect device that generates a tremolo or chorus sound effect by rotating a motor to rotate a fan provided in front of the speaker or the speaker, in which the plug of the headphone is connected to a jack. a first switch which is operated by insertion and which switches and connects a musical tone signal passing circuit from a speaker to a headphone; a second switch which rotates the speaker or fan with a motor; and a second switch which intervenes in the musical tone signal passing circuit. , further comprising a musical tone signal delay time modulation circuit that is activated when both the first and second switches are activated, and a tremolo or chorus effect is added to the musical tone signal by the operation of the modulation circuit. Effect device for electronic musical instruments.