JPS6143795A - Scale detector - 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 [Field of Industrial Application] The present invention relates to a device for detecting the pitch of a melody produced by a voice or a musical instrument and reproducing it by visual or auditory means.

[Prior Art] Conventionally, when detecting pitches using such a device, it is necessary to play a melody at a predetermined tempo.

[Problem that the invention seeks to solve]

However, it is difficult to play at a single tempo from beginning to end when playing a melody with voice or an instrument, and if the melody deviates from the tempo, the detection rate of pitches will drop significantly. there were.

In order to solve this disadvantage of the conventional technique, the present invention aims to eliminate restrictions on the tempo during performance by allowing the player to set the tempo according to his or her own will.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a tempo switch, such as a hand 41b or foot movement, which can be turned on and off at will by a voice or musical instrument player, and makes it easy to synchronize the melody and tempo to be played. did.

[Effect]

You can set Domon 1d from the body movements such as hand clapping or foot clapping that naturally occur when you are instructed to play a certain song, sing a song, or play a certain song. Output will be greatly improved. Furthermore, the same 1
011g No.c The tempo switch can be generated only when it is turned off, or when it is turned on and off.
You can operate both fast and slow tempo songs without any discomfort.

[Actual example]

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

FIG. 1 is a system block diagram of the present invention. Overall +
ll) To explain the work, the melody behind the voice or musical instrument is recorded using the microphone 101KJ: electric signal 102.
Instead, the period of the fundamental wave of the electric signal 1020 is calculated by the pitch extraction circuit 106, and the It all data 104 is sent to the pitch conversion circuit 105 as necessary. The pitch conversion circuit 105 creates a semitone step upper pitch conversion table or the like according to the frequency band of the target voice or musical tone, and converts it into measurement take 1041&: pitch data 106. The storage circuit 107 sequentially stores the pitch data 106 according to the tempo of the melody. The stored data 108 is displayed on the pitch reproduction means of the display circuit 109 or musical tone generation circuit 110 during or after the performance, or on a display device such as a liquid crystal display.
111 or the speaker 124 to produce a visual p + [
+4 Regenerated visually. Moreover, the tempo switch 112 is
Depending on the melody being played, the performance name is a switch that can be operated by hand or foot, and its off/off signal 11
3 is transmitted to the tempo generation circuit 114. The deni/vo generation circuit 114 uses the on/off ij 113 as a trigger to generate a concave 4u] signal 115 and transmits it to the system control circuit 116. At this time, JLIJ 4c, r No. 115 <
Ten Bosch ftsu 112 on's 1, only ¥ is generated, or on "tr, II: VC original is generated when off, Koshizawa money, system control II J road 116 ka 1 etc. market / Stem control switch F6' 16 receives input from control switch 117, which selects system operation from the outside, and synchronization signal 115, etc., and controls it. 1g No. 118-123 is generated.

Figure 2 shows the main feature of the present invention. 5 is a detailed diagram of the tempo switch 112 and the tempo generating circuit 114, and FIG. 5 is a timing chart for explaining the operation of the circuit of FIG. 2. In FIG. 2, the tempo switch 112 uses a commercially available button switch. The circuit composed of Ll-FF 201 and 202 is a known input circuit for removing the manual chattering of the tempo switch 112 and differentiating it to a predetermined pulse width. It is generated by the circuit 205. The second reason, referring to FIG. 3, is an on/off signal 115 from the tempo switch 112.
Niji, contrary to the sampling clock 205, the first stage D-
A q output 206 of the FF 201 and a possible output 207 of the FF 202 are generated. Further, an AND circuit 208 generates a differential signal 209 in synchronization with the rising edge of the on/off signal 1130. Further, the NOR circuit 210 is on/off.
Differential signal 21 synchronized with the fall of f) of off signal 113
Generates 1. These differential signals 209 and 211 are sent to the system control circuit as a synchronization signal 115 through an OR circuit 212. However, the operation of the NOR circuit 210 is controlled by the system control circuit 116.
It is valid only when the level is ``low level'' and invalid when it is ``high level''. That is, if the synchronization signal 115 is to be generated only when the tempo switch 112 is on, the control signal 1
18 is set to a "high level", and when the synchronizing signal 115 is generated both on and off, the control signal 118 is set to an "a-low level".

Next, we will discuss the operation of detecting the pitch of a melody based on FIG. 4. 102 is a schematic representation of the input melody, which usually fluctuates slightly with respect to the constant tempo 401 of a metronome or the like shown for reference. 115 C is a synchronization signal from the tempo switch mentioned above, and this synchronization signal 115 and melody signal 10
2 is inputted according to the will of the performer, so it is extremely easy to synchronize the two. Reference numeral 119 is a control signal for causing the pitch extraction circuit 105 to perform an extraction operation, which is performed at high speed regardless of the tempo. The pitch conversion circuit 105 converts pitch data 10 from a plurality of LTT side data 104 extracted within one period of the synchronization signal 115.
6 is determined, but that part'! il--This will be explained with reference to the enlarged view shown in FIG.

Since the melody signal 102 is generally very unstable in frequency and sound pressure at the beginning and end, that is, at the transition point, the conversion operation is performed at a relatively stable part near the center of the synchronization 100 No. 115. There is a need.

Therefore, as shown in the figure, 20 i during one period of the synchronization signal
When there is t 0111 data 104, for example, ignore the first and last 7 data, and calculate the average #V of the 6 data near the center.
Then, the pitch data 106 is determined.

Normally, the tempo of a song is said to be 40 to 208 beats per minute in quarter note terms, as can be seen from the metronome display, and 1.5 seconds to about Q, 3 seconds in period terms. . Therefore, if the song is slow, use the tempo switch 1120.
You can track the tempo just by turning it on, but if the song is fast, or if you want to divide the tempo into subdivisions greater than a major note,
One method that generates a synchronization signal not only during the on-action but also during the off-action can reduce the burden on the performer.

〔Effect of the invention〕

As explained above, this invention is designed to facilitate synchronization of the melody and tempo by providing a tempo switch, such as manual or foot movement, that can be turned on and off by the voice or musical instrument player at will. This has the effect of greatly improving the detection rate of one pitch.

[Brief explanation of drawings]

FIG. 1 is a system block diagram of the pitch detection device according to the present invention, FIG. 2 is a detailed diagram of the tempo switch and tempo generation circuit according to the present invention, and FIG. 3 is a timing diagram showing the operation of FIG. 2. 4 is a timing chart showing the pitch detection operation according to the present invention, and FIG. 5 is an enlarged view of FIG. 4. 105... Pitch extraction circuit 104... Measurement data 105... Pitch conversion circuit 106... Pitch data 112... Tempo switch 115... On/off signal 114... Tempo generation circuit 115...・Synchronization signal 116...System control circuit 118-125...Control 1a 201, 202-D-FF 208...AND circuit 210...NOR circuit 212...OR circuit and above Applicant: Seiko Electronics Kogyo Co., Ltd. Agent Patent Attorney Mogami Figure 1//l Figure 2 11δ

Claims (3)

[Claims] (1) At least a pitch extraction circuit that extracts the basic pitch of the waveform of a voice or musical tone, a pitch conversion circuit that converts the pitch information obtained from the pitch extraction circuit into a musical pitch, and an output of the pitch conversion circuit is stored. A memory circuit, a pitch reproduction means for visually or aurally expressing the contents of the memory circuit, and a tempo generation circuit for generating a synchronization signal that determines the operation cycle of the pitch conversion circuit, the memory circuit, and the pitch reproduction means. and a system control circuit that controls the operation of the system using a synchronization signal from the tempo generation circuit and a control switch, and a system control circuit that is connected to the tempo generation circuit and turned on at least manually or by foot movement. - A pitch detection device characterized by having a tempo switch that generates an off signal. (2) The pitch detecting device according to claim 1, wherein the tempo generating circuit is configured to generate a synchronizing signal only when an on signal of a tempo switch is input. (3) The pitch detecting device according to claim 1, wherein the tempo generating circuit is configured to generate a synchronizing signal when an on signal and an off signal of a tempo switch are input.