JPH0247210B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a melody that generates a melody at a tempo that corresponds to the cycle of a heartbeat, thereby allowing one's own mental state to be easily recognized.

(Prior Art) Conventionally, as disclosed in JP-A-54-98651, for example, a pulse wave detection device detects a pulse wave, that is, a heartbeat, and a heartbeat sound corresponding to this detection signal is generated. Measuring devices are known.

By the way, the heart rate is closely related to one's mental state; normal heart rate is 70 to 80 beats per minute, 50 to 60 beats per minute in a relaxed state, and 90 to 60 beats per minute in a tense state.
It is known that this happens about 100 times. Therefore, by using the conventional device described above and counting the heartbeat sounds that occur per minute, it is possible to recognize one's own mental state.

(Problems to be Solved by the Invention) As mentioned above, it was possible to recognize one's own mental state with the conventional device, but it required at least one minute of measurement time and furthermore, it was possible to recognize one's mental state. I had to count the sounds of my heartbeat.

The present invention solves the above-mentioned problems, and its purpose is to provide a device that can easily recognize one's own mental state in a short time.

(Means for Solving the Problems) In order to solve the above problems, the present invention is characterized in that the cycle of a detection signal corresponding to a heartbeat is measured, and a melody is generated at a tempo corresponding to the measured value. do.

(Example) Examples of the present invention will be described below based on the drawings. FIG. 1 is a block circuit diagram showing an embodiment of the present invention.

The reference signal generation circuit 2 generates a reference signal φ ₁ (for example, 10KHz) for measuring the period of a detection signal, which will be described later, and includes an oscillation circuit 4 and a frequency division circuit 6.
It consists of

The heartbeat detection circuit 8 detects a heartbeat and generates a detection signal corresponding to the heartbeat, and is composed of a heartbeat detection section 10 and a waveform shaping circuit 12. The heartbeat detection unit 10 uses, for example, a photoplethysmogram detection method, in which infrared light emitted by a light emitting diode is applied to a fingertip, and reflected light and transmitted light whose light intensity is modulated by blood flow are detected by a phototransistor. The waveform shaping circuit 12 shapes the signal from the heartbeat detection section 10 into a square wave with a constant pulse width, and outputs it as a detection signal. These output waveforms are shown in FIG.

The period measuring circuit 14 measures the period of the above-mentioned detection signal every time a certain number of the detection signals are output. The counter 16 is supplied with the detection signal output from the output B, and when it counts a certain number (for example, "4"), the output of the flip-flop (hereinafter referred to as FF) 18 is inverted by a carry signal. this
The output D of the FF 18 is supplied to the AND gate 20 together with the reference signal φ ₁ , and if the output D is “H”, the reference signal φ ₁ is supplied to the period counter 22 . Since the output of the FF 18 is inverted every time the detection signal is output four times, the period counter 22 counts the reference signal φ ₁ only during the period when the detection signal is output four times, and this count value is the detection signal. It represents the time it takes for 4 outputs. This count value is divided by 11/4 in the arithmetic circuit 24, and the latch circuit 26
is supplied as a measured value of the period of the detection signal. The latch circuit 26 stores the measured value when the output E of the FF 18 rises, and supplies the stored measured value to the melody signal generating circuit 28.

The melody signal generation circuit 28 is the period measurement circuit 14
The melody signal is generated at a tempo corresponding to the measured value from the melody signal, and will be explained in detail with reference to FIG. 3.

Clock signal from oscillation circuit 30 (approximately 4.19M
Hz) is divided by the programmable counter 32 to a predetermined scale frequency, and this scale frequency is stored in the ROM.
It is set by the scale data read from 34. The scale data of the address corresponding to the count value of the address counter 36 is read from the ROM 34, and the address counter 36 is read out from the note length counter 3.
8 is sequentially stepped by the output signal from 8. Further, the length of the note length counter 38 to be counted is set according to the note length data read from the ROM 34 shown in FIG.

The scale frequency signal outputted from the programmable counter 32 is supplied to the address counter 40, and sampling data of analog waveforms stored in advance in the waveform ROM 42 are sequentially read out. This sampling data is demodulated into an analog waveform by the DA converter 44, and the sound generation circuit 58
It will be converted into sound. Further, the envelope circuit 46 is operated by the output signal from the note length counter 38, and the D-A converter 44
gives an attenuating effect to the output signal of the frequency dividing circuit 4.
Programmable counter 3 for low frequency signals from 8
By supplying the signal to the lowest bit of No. 2, the scale frequency is varied to give a vibrato effect, thereby generating sounds close to natural sounds or musical instrument sounds.

On the other hand, the note length counter 38 is supplied with the output signal of the programmable counter 50 as a clock signal, and the note length counted by the note length counter 38, that is, the tempo of the song, is determined by the frequency division ratio set in the counter 50. It is understood that this may vary. The clock input φ of the programmable counter 50 is connected to the frequency dividing circuit 4 via an AND gate 52.
A clock signal φ (8192 Hz) is supplied from 8, and a frequency division ratio setting signal is supplied from a frequency division ratio converter 54 to the data input terminal. The frequency division ratio converter 54 converts the measurement value from the period measurement circuit 14, that is, the period of the heartbeat, into a frequency division ratio setting signal (8 bit code signal).
The relationship between both signals is as follows. That is, if the value of the measured value from the period measuring circuit 14 is t, and the value of the frequency division ratio setting signal is N, then the relationship is approximately expressed as N=8192Hz/64×tsec. Here, the constant "64" is a frequency division ratio set in the note length counter 38 in order to count the quarter note length (see FIG. 4). This frequency division ratio setting signal is applied to the programmable counter 5 at the rising edge of the output E supplied from the period measuring circuit 14.
Preset to 0. Also, the above output E is FF5
It is also supplied to the clock input φ of 6, and the output E
The melody signal generating circuit 28 is configured to start operating from the time when the melody signal generation circuit 28 first rises.

Note that the output H of the on/off switch 60 is supplied to the heartbeat detection circuit 8, the period measurement circuit 14, and the melody signal generation circuit 28, respectively, and the operation of the switch 60 controls the on and off operations of each circuit. There is.

The present embodiment is constructed as described above, and its operation will be explained below based on the time chart shown in FIG.

When the on/off switch 60 is closed at time t ₁ , the heartbeat detecting section 10 starts detecting the heartbeat, and outputs a constant width pulse as a detection signal corresponding to the heartbeat to the output B. This pulse is sent to the counter 16 .
will be counted. When the counter 16 counts the fourth output pulse at time _t2 , a pulse is also output to the output C, thereby inverting the output of the FF 18. Therefore, the period counter 22 starts counting the reference signal φ ₁ generated at the output F.

On the other hand, the counter 16 also sequentially counts the pulses outputted to the output B, and when the fourth output pulse is counted again from time _t1 , a pulse is outputted to the output C, so that the output of the FF 18 is inverted again.
At this time, output D changes from "H" to "L", and output E changes from "H" to "L".
Since the level changes from "L" to "H", the latch circuit 26 stores the value obtained by dividing the count value of the period counter 22 from time t ₁ to time t ₂ by 4, that is, the period of the heartbeat. The count value is cleared via the delay circuit 23. Further, as the output E rises, the output G of the FF 56 becomes "H" and the programmable counter 50 is preset with a frequency division ratio corresponding to the above period. Therefore, the operation of the melody signal generation circuit 28 is started, and a melody is played at a tempo corresponding to the cycle of the heartbeat.

At this time, if a melody, which is normally played at a tempo of about 70 to 80, is stored in advance, the user can recognize his own mental state by listening to the melody played at time _t3 . In other words, if the person is in a relaxed state, the tempo of the melody will sound slower than usual, if the person is nervous, the tempo will be heard to be faster than usual, and if the person is in a normal state, the melody will sound completely normal.

Furthermore, in this embodiment, the heartbeat detection operation is performed even after time t ₃ , and the configuration is such that the operation from time t ₁ to time t ₂ described above is repeated, thereby achieving a desired mental state of the self. This allows the state to be controlled. In other words, if the operation from time t ₁ to time t ₃ is repeated, the tempo of the melody will be newly set every 8 heartbeats, and if you try hard to hear the melody without any sense of discomfort during this time. good.

For example, if the tempo of the melody played from time _t2 sounds fast, you can try to make the melody's tempo a normal tempo. As a result, as shown from time _t4 to time _t3, the heartbeat cycle slows down and the melody no longer feels strange, and one's mental state also approaches a normal state. Of course, the tempo is usually 50-60, or
By memorizing melodies that are played at around 90 to 100 increments in advance, you can relax or tense up your own mental state.

Then, when the on/off switch 60 is turned off as shown at time _t6 , the generation of the melody is stopped.

(Effects of the Invention) As described above, according to this embodiment, a melody is played soon after the measurement starts, and by listening to this melody, it is possible to intuitively recognize one's own mental state. This eliminates the hassle of counting heartbeat sounds for a minute. Furthermore, in this embodiment, by making an effort to eliminate the sense of discomfort in the melody that is played based on one's own mental state, one can control one's own mental state to a desired state, which is very useful for managing one's own mental state.

As described above, the present invention allows one's own mental state to be easily recognized in a short time without requiring the troublesome measurement operations required in the conventional methods.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram showing a preferred embodiment of the present invention. FIG. 2 is a time chart showing the operation of the embodiment. FIG. 3 is a detailed diagram of the melody signal generation circuit. FIG. 4 is a diagram showing note length data set in a note length counter. 2... Reference signal generation circuit, 8... Heartbeat detection circuit,
14... Period measurement circuit, 28... Melody signal generation circuit, 58... Sound generation circuit.

Claims (1)

[Claims] 1. A heartbeat detection circuit that detects a heartbeat and outputs a detection signal corresponding to the heartbeat, a period measurement circuit that measures the period of the detection signal, and a period measurement circuit that converts the period into a note length corresponding to the period. A melody generation device corresponding to heartbeat, comprising: a melody signal generation circuit that generates a melody signal; and a sound generation circuit that converts the melody signal into an audible sound.