JPS58123591A - Electronic musical instrument - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention provides musical instrument sound f! Concerning electrically produced electronic musical instruments.

In recent years, electronic organs have been developed that can output not only the sounds of musical instruments such as pianos, cheetahs, and flutes, but also any tones of any tone.

However, to play a kind of electronic musical instrument.

As with conventional musical instruments, musical scores must be used, and it is still difficult for the average person to use it, as it requires a considerable amount of playing technique.

The present invention has been made in view of the above points.

To provide a new electronic musical instrument that can be played* based on the performer's voice, that is, the singing voice, and can be played with accurate pitch.

FIG. 1 shows the iW electronic musical instrument configuration of the present invention. In the same figure, the sound in (1) is the sound of heavy machinery Pif! This is a microphone amplifier that converts the audio signal obtained from the microphone (+21H) into a signal.

(3) Envelope detection...J-circuit, and the above microphone amplifier (2
The sound signal from 1 is detected and adjusted to obtain its envelope signal. , r41 is an envelope generation N path, and based on the envelope signal obtained from the envelope detection circuit (3), a simulated envelope signal imitating the waveform of a piano is generated. (This is an A/D converter with a 51 frame sampling function, which samples the audio signal obtained from the Okuki microphone amplifier (2) at a frequency of 8KHz, and converts it into a digital code.

(6) is a fundamental frequency extraction circuit, and the A/D converter (
By processing the sample/L/value sequence of the audio signal from 5), the fundamental period of the audio signal at this time is extracted. The calculation process in the refusal circuit (6) is the sample interval time when the autocorrelation function between specific sample values shows a maximum of 61, or the sample interval when the difference function between specific sample values shows a minimum of 1. There is one derived as the fundamental period of the time-all audio signal. (7) is a quantization circuit, which quantizes the fundamental period obtained from the fundamental period extraction circuit (6) into a scale period corresponding to the frequency of each octave 12-tone scale.

As a quantization heat field in the refusal circuit (7), the scale period of each octave 12-tone scale is stored in advance over many octaves, and the fundamental period obtained from the fundamental period extraction circuit (6) and each of the above Find the error from the scale period.

It is sufficient to detect the scale with the minimum error. (8) □ This is a clock generator, which generates a sound source clock having the scale frequency W[ obtained by the above-mentioned Toshiko circuit (7). As a clock generation means in the circuit (8), a division ratio is set for each scale to divide the reference clock of several KHz into 12 times into each octave m, and the clock generation means is obtained from the above-mentioned imperialization circuit (7). The reference clock may be frequency-divided by selecting a division ratio corresponding to the scale period of . (9) is a wide-width modulation circuit in which the amplitude of the sound source clock obtained from the clock generator (8) is modulated by the simulated envelope signal obtained from the envelope generating circuit (4). (10
6'j: Power amplifier, which amplifies the modulation signal from the amplitude-variable 1DA circuit (9) to drive the speaker at 0 pf.

FIG. 2 shows the signal waveforms of each part of the multilayer musical instrument having such a structure, and the operation of the multilayer musical instrument of the present invention will be described based on the figure. For example, when a performer plays the pitch of “wo” in the Ha-o key (frequency 444),
Hz), it is normal for Tanashi to actually utter the sound at exactly the scale frequency of 444Hz, and for this reason, suppose that the sound at the frequency of 445Hz is input to Micro 7ton (1). . In this case, the audio signal obtained from the microphone (1) and amplified by the microphone amplifier (2) has a waveform as shown in FIG. 2 (aJ).At this time, the envelope detection circuit (3) In this case, a waveform envelope signal as shown in (1)) in the same figure is obtained, and the envelope generation circuit (
4), all rising positions of this envelope signal are detected and (
The trigger pulse in H in the same figure, from this point on in the same figure (Ill
A piano envelope M-line signal with a waveform as shown in is generated.

On the other hand, the fundamental period extraction circuit (6) finds the fundamental period 1/445S8C at this time. In the quantization circuit (7), the basic period is 1/445Se.
It is determined that the error between the scale period of 17,444 seconds between C and @wo in the key of Ha is the smallest compared to other scale periods, and a signal indicating this scale period of 1/444 seconds is introduced into the clock generator (8). This allows the clock generator (8
) becomes a fist that generates a sound source clock having a scale frequency of 1/444 Hz as shown in the figure (θ), that is, a scale frequency of 444 Hz intended by the performer. Then, in the amplitude modulation circuit (9), this tone source clock with a scale frequency of 444 Hz is modulated by the piano simulated envelope signal from the envelope generation circuit (4), as shown in the figure (fl). It becomes a modulated signal with a waveform like this.

Power amplifier 11 (Depending on j, it outputs a piano tone with a pitch of ``Wo'' in C major without deviation from Speaker B and 1-. Thus obtained modulation (shown in No. 811 in Fig. 2C)) The envelope of the piano sound that can be heard is the envelope line of the piano, so although a simplified waveform of 1 clofuku is substituted for each cycle, the tone is similar to that of KALIPI γ). In the above-mentioned embodiment, an example was given of a Shigeko instrument that produces a piano tone, but by shaping the waveform of the simulated envelope signal generated by the envelope generation circuit (4) into a desired shape. .

It becomes possible to obtain the musical instrument sounds of Cheguchi and other instruments exclusive to 7TV-1. In addition, by assigning a specific number of clocks (for example, 2) to each scale period using the variable frequency divider (8), it is possible to create an instrument sound with a more natural timbre by assigning a specific number of clocks (for example, 2) to each scale period. Become.

As is clear from the explanation below, the Shigeko musical instrument of the present invention has the following features:
The fundamental period of the voice extracted by the fundamental period extraction circuit is converted into a period corresponding to a discrete scale frequency by a quantization circuit, and this quantized period is converted by a black scale generator to Therefore, it is possible to obtain an accurate sound source clock that corrects pitch deviations of the performer's input voice. Therefore, the user can easily perform out of pitch simply by singing the song without requiring any special performance techniques.

[Brief explanation of the drawing]

@ Figure 1 is a block diagram showing an embodiment of the Shigeko musical instrument of the present invention, and Figure 2 is a drum-shaped diagram showing signal waveforms of each part of the embodiment of the present invention in Figure 1. 3) is an envelope detection circuit, (4) is an envelope generation circuit, (6) is a fundamental period construction circuit, (7) is a quantization circuit, (8) is a clock generator, (9) is an amplitude modulation circuit, f] 11 indicates the speaker (-).

Claims (1)

[Claims] 1) Audio? a microphone 7t for converting it into an electrical audio signal; and a fundamental period extraction path for extracting the fundamental period of the audio signal that is falsified by the microphone 7J). a quantization circuit that quantizes the fundamental period obtained from the fundamental period extraction port into discrete periods corresponding to each scale frequency;
An instrument sound is created based on a sound source clock obtained by a clock generator that generates a sound source clock having a scale frequency corresponding to the period turned over from the quantized concave path, and a fully equipped clock generator. An electronic musical instrument