JPS634190B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic musical instrument device in which performance sound characteristics of an electronic musical instrument are set in accordance with the acoustic effects of a performance venue.

When playing an electronic musical instrument, the characteristics of the performance sound are greatly influenced by the acoustic characteristics of the performance venue. For example, if you perform in a room with a lot of sound reverberation, you will hear the performance sound with a reverberation effect added, and if you play in a room with almost no reverberation, you will hear the performance sound with a reverberation effect added. , the performance sound is heard as monotonous. Therefore, especially in the case of electronic musical instruments, the settings of musical tones, such as sustain time, tremolo,
It is necessary to set the degree of modulation such as vibrato and timbre effects.

This invention was made in view of the above points, and is designed to accommodate the acoustic characteristics of performance venues where electronic musical instruments are installed, such as stages, halls with audience seating, music classrooms, and general homes. It is an object of the present invention to provide an electronic musical instrument device that can automatically set sound characteristics.

That is, the electronic musical instrument device according to the present invention generates a noise sound in a performance venue where the electronic musical instrument is installed, detects the noise sound with a microphone device, and discriminates the detected noise sound signal to perform the performance. It is designed to control sound characteristics.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows its schematic configuration, which includes a noise generator 11 such as white noise. This noise generator 11 is driven by a trigger pulse signal generated in response to the operation of a switch 12 that is turned on in response to a performance sound setting command, etc., and gives a trigger-like noise signal to the speaker 13. Generates a pistol-like noise signal.
This speaker 13 is installed in a performance venue and emits pistol noise sound into the performance venue, and the emitted noise sound affected by the acoustic characteristics of the performance venue is detected by a microphone 14. .

The acoustic signal detected by the microphone 14 is supplied to an acoustic characteristic detection circuit 15, and this circuit 15 is set to an operating state in response to the operation of the switch 12, and effects the acoustic signal corresponding to the noise sound. It will be able to detect it. This acoustic characteristic detection circuit 15 detects the reverberation time, frequency characteristic distribution, etc. from the detected noise sound signal, and although not particularly shown, it may also be compared with the noise sound signal supplied to the speaker 13. good. The detection circuit 15 generates control information such as the frequency characteristics of the performance venue, reverb time, etc., and provides commands to the parameter setting circuit 16. This parameter setting circuit 16 may be, for example, a decoder configured with a ROM, etc., and controls the volume, tone, reverb, etc. for the electronic musical instrument 17 in response to control command information from the acoustic characteristic detection circuit 15. It gives sound setting commands. That is, in the electronic musical instrument 17, the performance sound settings are controlled in accordance with the acoustic characteristics of the performance venue, and the performance sound settings are performed by operating the switch 12 prior to the start of the performance.

FIG. 2 shows a more specific example, in which the acoustic characteristic detection circuit 15 includes an envelope time (t) detection circuit 18 to which the detection signal from the microphone 14 is supplied. This circuit 18 is supplied with a one-shot pulse from a one-shot circuit 19 driven by a trigger signal from the switch 12, and is set to an operating state in an interval corresponding to this pulse width. For example, as shown in FIG. 3A, the time width is set to be sufficiently longer than the duration of the detection signal from the microphone 14 corresponding to pistol noise. for example,
When a pistol noise sound is generated from the speaker 13 in FIG. 1, the envelope of the noise detection signal from the microphone 14 is in a state as shown in B in FIG. 3.

The envelope time detection circuit 18 detects the signal B in FIG. 3 at a specified level A, detects a reverberation time t exceeding level A, and supplies it to the latch circuit 20. A latch command signal shown in FIG. 3D is applied to the latch circuit 20 in response to the completion of the measurement of the time t in the detection circuit 18, and the reverberation time information t is stored in the latch.

The information stored in the latch circuit 20 is converted into control information by a parameter setting circuit 16 consisting of a decoder, and further converted into a voltage signal by a D/A converter 21. Then, this voltage signal is appropriately converted into a voltage to control a vibrato oscillator 22 which is a voltage-controlled variable frequency oscillator, and the vibrato frequency is controlled in accordance with the reverberation time characteristic. The oscillation signal from the oscillator 22 is used to control the sound source oscillator 23 of the electronic musical instrument 17 so as to frequency-modulate it, thereby adding a vibrato effect to the musical tone being played.

Further, a tremolo oscillator may be controlled by a signal from the D/A converter 21, and the oscillation signal from this tremolo oscillator is supplied to an amplitude modulation circuit for musical tone signals.

Furthermore, as shown in FIG. 4, in the electronic musical instrument 17, the musical instrument signal is supplied directly or via the reverb unit 24 to voltage-controlled variable gain amplifiers 25 and 26, respectively.
The output signals from 5 and 26 are synthesized and extracted to be produced by the performer. And D/
The gain of the amplifier 25 is controlled by the voltage signal from the A converter 21, and the gain of the amplifier 26 is controlled by inverting the voltage signal by the inverting circuit 27.

That is, the levels of the direct musical tone signal and the signal to which the reverb effect has been added are reciprocally controlled by the output voltage signal from the D/A converter 21, that is, by the reverberation time characteristics of the performance venue. , the reverb effect on the performance sound of the electronic musical instrument 17 is set in a state corresponding to the acoustic characteristics of the performance venue.

FIG. 5 shows a further different embodiment,
The detection signal from the microphone 14 is supplied to a fast Fourier transform circuit 28 . This circuit 28 is activated by the output signal of the one-shot circuit 19 as in the previous embodiment, and converts the detected acoustic signal from the microphone 14 into frequencies ₁ , _2, . . _{. o}
It detects the level corresponding to each and detects the frequency distribution characteristics, and this Fourier transform information is
The signal is supplied to a sample and hold circuit 29. A differential pulse signal obtained by differentiating the signal from the one-shot circuit 19 by a differentiating circuit 31 via a delay circuit 30 is applied to the sample-hold circuit 29 as a sample-and-hold command.

Here, the sample and hold signal is sent to the delay circuit 30.
The reason for the delay is that it takes time for the noise emitted from the speaker 13 to be detected by the microphone 14, and that the sampling is delayed when the detection signal begins to attenuate a little from its peak value. This is because it is suitable.

Information corresponding to each frequency ₁ , ₂ ... _o held by the sample and hold circuit 29 is supplied to a decoder 32 ₁ , 32 ₂ ... 32 _o for parameter setting corresponding to each frequency, and this decoder 32 ₁ The output information from 32 _o is supplied to musical tone control circuits 33 ₁ , 33 ₂ . . . 33 _o of the electronic musical instruments, respectively. This musical tone control circuit is supplied with musical tone signals FI _{1 ,} FI ₂ , . . . _{FI o divided} into bands corresponding to frequencies ₁ , ₂ . The musical tone signal is transmitted through a variable gain amplifier 25
It is also supplied to a variable gain amplifier 26 via a reverberation unit 24. And decoder 32 ₁
The gain of the amplifiers 25 and 26 is reciprocally controlled using the output of the D/A converter 21, which is supplied with information from the D/A converter 21, and musical tone signal outputs FO ₁ and FO with reverb effects added and controlled corresponding to each frequency band, respectively. ₂ ... Try to get FO _o . These signals FO ₁ to _{FO o} are synthesized and guided to a speaker circuit, where they are produced as performance sounds.

That is, the musical tone signal is divided into bands in accordance with the frequency characteristics of the noise signal detected by the microphone 14, and the reverb effect is controlled for each band. Therefore, the reverb effect addition control can be performed in accordance with the acoustic frequency characteristics of the performance venue.

In the embodiment, the noise sound emitted from the speaker 13 into the performance venue has been described as having a pistol sound shape, but it may of course be a continuous noise sound. However, when detecting reverberation characteristics etc., pistol noise sound is suitable.

As described above, according to the present invention, the acoustic characteristics of the performance venue are detected prior to the start of the performance, and the characteristics of the electronic musical instrument performance sound, such as reverb and modulation, are selected and set in accordance with the detected characteristics. Therefore,
This allows the performance sound to be set in the most audible state, and is highly effective in improving the performance effect.

[Brief explanation of the drawing]

Figure 1 is a diagram schematically explaining this invention, Figure 2 is a diagram schematically explaining the invention.
FIG. 3 is a block diagram illustrating an electronic musical instrument device according to an embodiment of the present invention, FIG. 3 is a block diagram illustrating the above embodiment, and FIGS. 4 and 5 illustrate other embodiments of the present invention. FIG. 11...Noise generator, 12...Switch, 1
3...Speaker, 14...Microphone, 15...
... Acoustic characteristic detection circuit, 16 ... Parameter setting circuit, 17 ... Electronic musical instrument, 18 ... Envelope time detection circuit, 19 ... One shot circuit, 20 ...
...Latch circuit, 28...Fast Fourier transform circuit.

Claims (1)

[Claims] 1. Means for generating noise in a performance venue;
A microphone mechanism that detects noise emitted into the performance hall, an acoustic characteristic detection device that determines the characteristics of the noise signal detected by this mechanism, and a performance sound circuit that detects the characteristics of the noise signal from this detection device. An electronic musical instrument device comprising means for controlling musical tone formation. 2 The noise generated above is set as a trigger pulse-like pistol noise, and the acoustic characteristic detection circuit detects the attenuation characteristic of the noise sound signal detected by the microphone mechanism, and performs the performance according to the attenuation time characteristic. 2. The device according to claim 1, wherein the degree of modulation of sound, reverb characteristics, etc. are controlled. 3. The apparatus according to claim 1, wherein the acoustic characteristic detection apparatus detects the frequency distribution characteristic of the detected noise sound and controls the performance sound signal by frequency band.