JPS6022390Y2 - electronic musical instruments - Google Patents

Description

[Detailed description of the invention] This invention relates to an electronic musical instrument that supplies musical tone signals selectively derived from a scale sound source by a key switch to a transmitting antenna via a timbre circuit and further a modulation circuit.
An object of the present invention is to provide an electronic musical instrument in which a musical tone signal can be automatically output on radio waves from a transmitting antenna when the transmitting antenna is projected outward from the main body of the electronic musical instrument.

Hereinafter, embodiments of this invention will be described based on the drawings.

FIG. 1 shows a block diagram of an electronic musical instrument, in which 1 is a scale sound source that includes an oscillator, a frequency dividing circuit, etc. and forms a musical tone signal, 2 is a group of key switches for selecting a desired musical tone signal from the scale sound source 1, and 3 is a scale sound source that forms a musical tone signal. The timbre circuit, 4 is a preamplifier.

The output side of the preamplifier 4 is connected to a movable terminal of an interlocking switch 5, one fixed terminal of the interlocking switch 5 is connected to a headphone 7 via an amplifier 6, and the other fixed terminal is connected to a movable terminal of a frequency modulation circuit 8 of a transmitting circuit. Connected to the signal input side.

9 is a carrier wave signal oscillator, and 10 is an amplifier, which together with the frequency modulation circuit 8 forms a transmitting circuit, and is configured so that a carrier wave modulated by a musical tone signal is transmitted from a waist transmitting antenna 11.

Here, as shown in FIGS. 2 and 3, the transmitting antenna 11 is disposed at the top of the electronic musical instrument main body 14 so as to be able to protrude upward from the electronic musical instrument main body 14, and furthermore, the transmitting antenna 11 is arranged at the top of the electronic musical instrument main body 14 so as to be able to protrude upward from the electronic musical instrument main body 14. The above-mentioned interlocking switch 5 for switching the signal between the transmitting circuit side and the headphone side is attached in conjunction with the movement of the transmitting antenna 11.

That is, the interlocking switch 5 operates to supply the output of the preamplifier 4 to the frequency modulation circuit 8 by the projecting operation of the transmitting antenna 11, so that the transmitting antenna 11 connects to the electronic musical instrument main body 1.
When turned to the 4 side, the interlock switch 5 operates to supply the output of the preamplifier 4 to the headphones 7 via the amplifier 6.

Note that 12 is an indicator such as a light emitting diode connected to the modulation input side of the frequency modulation circuit 8, which responds to the frequency of the musical tone signal to indicate that the musical tone signal is being supplied to the frequency modulation circuit 8. The display will blink.

Reference numeral 13 denotes a transmission stop switch, which is used to stop the transmission of radio waves.

Next, the operation of this electronic musical instrument will be explained.

First, when listening to the performance of an electronic musical instrument using the headphones 7, the transmitting antenna 11 is placed on the side of the electronic musical instrument main body 14,
The movable terminal of the interlock switch 5 is connected to a fixed terminal connected to the amplifier 6 side.

When a performance is started in this state, a musical tone signal selected by a key switch group 2 from a scale sound source 1 passes through a timbre circuit 3 and a preamplifier 4 and enters an amplifier 6, and the user can listen to the performance of the electronic musical instrument through headphones 7.

On the other hand, if the performance of an electronic musical instrument is to be transmitted by radio waves to another receiver, the transmitting antenna 11 is raised upward from the electronic musical instrument main body 14, and the interlocking switch 5 is actuated to connect its movable terminal to the frequency modulation circuit. Connect to the fixed terminal connected to 8.

When the electronic musical instrument is played in this state, the musical tone signal output from the preamplifier 4 is supplied to the modulation input side of the frequency modulation circuit 8 via the interlocking switch 5, and the carrier wave signal is frequency modulated. The signal is transmitted from the transmitting antenna 11.

These radio waves are received by a normal receiver and emitted as musical tones.

In this way, by the projecting operation of the transmitting antenna 11, the means for listening to the performance of the electronic musical instrument can be automatically switched between the headphones attached to the electronic musical instrument or another receiver.

Note that if an amplitude modulated wave is used, an amplitude modulation circuit will be used in place of the frequency modulation circuit 8.

In addition, in this embodiment, the transmitting antenna that is placed on the side of the main body of the electronic musical instrument may be pulled out and placed upright.

Furthermore, by driving the switch 13 with a knee lever, transmission of radio waves may be stopped during the performance.

As described above, according to the electronic musical instrument according to the present invention, in the electronic musical instrument equipped with a circuit capable of transmitting musical tone signals, the transmitting antenna is held so as to be able to protrude outward from the main body of the electronic musical instrument, and an interlocking switch is attached to the transmitting antenna. Since the structure is configured such that the interlocking switch is switched by the projecting operation of the antenna, the musical tone signal of the low frequency circuit is sent to the modulation circuit, and the carrier wave modulated by the musical tone signal is transmitted from the antenna. By simply protruding the transmitting antenna outward, it is possible to automatically put the musical tone signal on radio waves and output it, and it is easy to confirm that it is in the transmitting state. By folding down the antenna, musical tones can be emitted through headphones or the like.

[Brief explanation of drawings]

The drawings show an embodiment of this invention; Fig. 1 is a block diagram of an electronic musical instrument, Fig. 2 is a perspective view of the electronic musical instrument with the transmitting antenna protruding, and Fig. 3 is a state with the transmitting antenna retracted. FIG. 1... Scale sound source, 2... Key switch group, 3... Tone circuit, 5... Interlocking switch, 11... For transmission antenna.

Claims (1)

[Claim for Utility Model Registration] A low-frequency circuit that outputs a musical tone signal selectively derived from a scale sound source by a key switch to a subsequent circuit via a timbre circuit, etc., and a modulation circuit that modulates a carrier signal by amplitude modulation or frequency modulation. In the electronic musical instrument, the low-frequency circuit includes a high-frequency circuit that modulates a musical tone signal from the low-frequency circuit and outputs the modulated signal to a transmitting antenna, the antenna being held so as to be able to protrude outward from the main body of the electronic musical instrument; One interlocking switch is provided, and by operating the interlocking switch in conjunction with the projecting operation of the antenna, a musical tone signal is switched and sent from the low frequency circuit to the modulation circuit, and a carrier wave modulated by the musical tone signal is transmitted. An electronic musical instrument characterized in that the electronic musical instrument is configured such that it can be output as a radio wave from an antenna.