JPS619695A - pitch comparison device - 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 [Technical Field of the Invention] The present invention relates to a pitch comparison device used for singing practice in a so-called karaoke device.

(Prior Art) Generally, in a karaoke device, an accompaniment signal and a singing signal are recorded in different trunks.

These signals? - At the same time, the accompaniment signal among the reproduced signals is converted into an elliptic voice by the speaker, and by singing into the microphone while listening to the converted accompaniment, the song from the microphone is amplified.
It comes from the loudspeaker along with the above accompaniment. On the other hand, the reproduced singing signal is input to a pitch comparison device together with the signal from the microphone, and the singing from the microphone is evaluated.

As this pitch comparison device, the one shown in FIG. 5 is conventionally known. In the figure, reference numeral 1 is an input terminal of a microphone, 2 is an input terminal of a reproduced singing signal, and 3.4 is a period detection circuit. The signals from the input terminals 1 and 2 are input to these period detection circuits 6.4, respectively, and the period signal which is the output signal of the period detection circuit 3.4 is combined with the output of the oscillator 5 of a constant high frequency. The period of the oscillator 5 which is supplied to the counting circuits 6 and 7 and is generated in one period of the microphone signal from the input terminal 1 and the period of the oscillator 5 which is generated in one period of the singing signal from the input terminal 2 is always It is counted. This counting result, together with the periodic signal, is supplied to a determination circuit 8 composed of a microcomputer or the like, and the pitch relationship between the microphone signal and the singing signal is determined.
For example, the same pitch octave relationship, deviation, etc. are determined. The result of this determination, that is, the pitch detection signal is output to the display device 9, and the pitch relationship is displayed.

By the way, in enka, etc., there are unique passages in the singing style,
There is a lot of fluctuation in the high notes such as vipra-to, and there is a large difference in the fluctuation in the high notes depending on the singer, so the pitch between the above-mentioned reproduced singing signal and the microphone signal is rarely the same, and the above-mentioned Conventional pitch comparison devices have the disadvantage that even though the pitch of the microphone signal is correct, the pitch is often determined to be off due to subtle differences in the singing style of the singer. .

[Summary of the Invention] This invention has been made to eliminate the above-mentioned drawbacks of the conventional technology, and it is a method for comparing pitches from the point of the strong beat (stress) part of the singing to the point of the vibrato part during singing. The pitch is designed to judge the pitch between the microphone signal and the singing signal only in the stable part, and it is possible to judge the pitch relationship without being affected by pitch differences caused by the singer's subtle singing style. It provides a comparison device.

[-Examples of the invention]

Hereinafter, a diagram of one embodiment of the present invention will be described. In Fig. 1, reference numeral 1 is the input terminal of the microphone, 2 is the input terminal of the reproduced singing signal, and 3 and 4 are the period detection circuits, and these components were explained using the same reference numerals in Fig. 1 above. It is the same thing. Signals from input terminals 1 and 2 are input to the period detection circuit 6.4, respectively. , 10 and 11 are detection circuits, to which the signals inputted from the input terminals 1.2 and 612.13 detect the stressed part of the audio signal, respectively, from i o , i i A delay device 14.15 delays the detection signal of i2. for a certain period of time (first time). This is a time signal generator that generates a signal for a certain period of time (second time) after receiving the delayed signal from i3.

The outputs of the time signal generators 14 and 15 and the periodic signals that are the outputs of the periodic detection circuits 3 and 4 are respectively output from the counting circuit 6.
．． 7, these counting circuits count periodic signals during the generation period of the time signal, which is the output of the time signal generator 14. The pitch relationship between the microphone signal and the reproduced singing signal is determined, and the pitch detection signal, which is the determination result, is supplied to the display device 9. Uyl staff is displayed in the 7th position.

The detection circuit 10 for the stressed portion is configured as shown in FIG. 2, for example.6 In FIG.
17 and 18 are rectifiers 2), and 19 and 20 are different time constants τ1. This is an integrator with τ2. The output of this integrator is input to the IE comparator 21.

Further, 22 indicates an input terminal, and 23 indicates an output terminal.

The input signal from the input terminal 22 is amplified to an appropriate level by the amplifier 16, rectified and returned by the galvanometer 17.18, and then processed by the integrator 19.20 to each time constant τ1. τ
It is integrated by 2. The forces of the first and second integrators 19 and 20 are input to a constant pressure comparator 21, from which a differential pulse of the envelope of the input signal, ie, a pulse corresponding to the strong beat portion, is obtained. A similar configuration can be used for the detection circuit 11 as well.

Top jt! :,: [j period detection circuit 3 is, for example, M3
It is structured as shown in the figure. In FIG. 3, reference numeral 24
Is it an audio signal? Approximately 60 to 600 for effective extraction
The band pass filter 25 of H2 is a high cut filter that removes high frequency components w. 26 is a zero cross detector, 27
is a flip-flop circuit, 28 is an input terminal, and 29 is an output terminal. , 4 From the input signal from the upper UE7 input terminal 28, the audio band is extracted by the bandpass filter 24, and then the high frequency component is removed by the high-cut filter 25. After this high frequency component is removed, outputs corresponding to the positive half cycle and the negative half cycle of the first fundamental wave component are obtained from the flip-flop circuit 27. A similar configuration can be used for the synchronization detection circuit 4 as well.

Next, the operation of the pitch comparison device used above is:? , Figure 4 1
Understand this while referring to the waveform diagram. The microphone signal S1 of the microphone collar and the singing signal S2 are fed to the above-mentioned input terminal 1.2. , and the singing signal S2 has a strong beat part at the position indicated by the symbol B.The strong beat part B of the song is detected by the stress part detection circuit 10.11 described above.
Strong beat detection code S10. S11 is obtained. These strong beat detection signals are sent to the Serinobu device 12.13.
．． The stiff delayed signal is delayed by a time T1 of 0.05 to 0.4 seconds and a delayed signal 812, 813 is generated. time signals 814° and 815 are obtained. On the other hand, from the period detection circuit 3.4.

A signal 83 according to the period of the input signal. S4 is output, and these are sent to the first counting circuits 6 and 7, respectively (JL and Kowara counting circuits measure periodic signals within the period of time signals 814 and 815. Then, the counting results of both the counting circuits 6 and 7 are the same number, 12.The counting results corresponding to the above time signals are supplied to the determining device 8.
Matching, mismatching, multiple relationship, etc. of single number results are determined.
This determination result is displayed on the display device 9 as shown in FIG.

Incidentally, in the above embodiment, only the input signals of I)-1-F, in which different time signals are used for each incoming signal, are supported.
- generates a time signal, and one of the two systems within this time signal.
．． Alternatively, the period of the input signal may be counted. In this match, not only the (p, pitch 0) judgment, but also the temporal fl.
It is possible to determine q at the same time.

〔Effect of the invention〕

As described above, the present invention includes a detection circuit that detects a stressed portion of a two-system 0 input signal, and a detection circuit that detects a stressed portion of a two-system 0 input signal, and after a predetermined first time elapses from the detected stressed portion, detects another predetermined second time. It is equipped with a counting circuit that counts the frequencies of the above-mentioned two input signals in time, and the output of the counting circuit is set to J:5, which determines the pitch relationship of the above two input signals. By supplying the reproduced singing signal 11 as one of the above two input signals 0) and the microphone signal from the microphone as the other signal, it is possible to avoid being influenced by the singer's delicate singing style. A pitch comparison device capable of comparing pitches is obtained. 1. 4. Figure 1 is a block diagram of a pitch comparison device showing an embodiment of the present invention. 5. 2. 6 and 6 are block diagrams showing the main parts that are different from those in FIG. 1, FIG. 4 is a signal waveform diagram to explain the operation of FIGS. It is a block diagram showing the composition of a sound, height comparison device.

1.2: Input terminal, 6, 4: Period detection circuit, 5: Oscillator, 6.7: Counting circuit, 8: Judgment device, 9: Display device, 1
Q, 11: Detection circuit, 12.13-delay device-14'
.

15: Time signal generator. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Agent: Patent Attorney Sanro Kimura Figure 1 Figure 2 Figure 3 2^ Figure 4 A 312 knee■-1-[--11--- Figure 5 and others

Claims (1)

[Claims] a detection circuit that detects the stressed portions of the two systems of input signals, and after a first time period determined from the detected stressed portions;
and a counting circuit that counts the frequencies of the above-mentioned two systems of input signals within another predetermined second time, and the pitch relationship of the above-mentioned two systems of input signals is determined based on the output of the counting circuit. A pitch comparison device characterized by the following.