WO2015131433A1

WO2015131433A1 - Drum tuning method and drum tuner

Info

Publication number: WO2015131433A1
Application number: PCT/CN2014/075998
Authority: WO
Inventors: 赵哲
Original assignee: 赵哲
Priority date: 2014-04-22
Filing date: 2014-04-22
Publication date: 2015-09-11

Abstract

A drum tuning method and a drum tuner. The tuning method comprises: emitting a testing light to a vibrating drumhead and receiving the testing light; performing amplification, wave-detection, wave-filtering, and wave-shaping on the testing light; measuring the frequency of the shaped signal; outputting tuning-related information. The tuner comprises a casing. Provided inside of the casing are a signal amplification circuit, a sampling and wave-detection circuit, a bandpass wave-filtering amplifier, a wave-shaping circuit, an MCU, a drive circuit, and a power supply. A testing light emitting and receiving device is provided on the casing. A detection signal output device is provided on the casing or inside of the casing. The power supply is separately connected to the circuits and the devices so as to provide power. The sampling and wave-detection circuit extracts an envelope signal from an AM wave. The angle of the light path of the testing light emitting and receiving device is between 0 and 50 degrees. A testing light receiving circuit, the amplification circuit, the wave-detection circuit, the wave-filtering circuit, the wave-shaping circuit, the MCU circuit, the drive circuit, and a testing light emitting circuit are connected in sequence. The MCU is connected to the wave-detection circuit and the detection signal output device. Using the drum tuning method and the drum tuner, tuning can be done accurately and conveniently without being interfered by noise or overtone.

Description

Drum tuning method and drum tuner

Technical field

The present invention relates to a method for drum tuning, and to a drum tuner using the tuning method. Background technique

The traditional drum tuning method is performed using an electronic tuner with a microphone or a piezoelectric buzzer as a sensor. The tuning principle of this tuner is: picking up the eardrum through a microphone or piezoelectric buzzer The vibration sound wave converts the vibration signal of the sound wave into an electric signal, and measures the vibration frequency of the sound wave represented by the electric signal, and displays the frequency of the measurement and the reference frequency of the tympanic membrane set by the debugger for the debugger to tighten the tympanic membrane The frequency is adjusted to the ideal state.

The above conventional drum tuner and tuning method have the following drawbacks:

First, the sound frequency of the drum surface is measured by picking up the sound wave signal, which is susceptible to environmental interference. When tuning in noisy environments (such as outdoors or performance venues), there are multiple sound sources. While the traditional electronic tuner picks up the sound waves of the tympanic membrane, other disturbing sound waves are also picked up by the electronic tuner. This kind of interference will greatly reduce the accuracy of the electronic tuner to measure the vibration frequency of the eardrum. In severe cases, it cannot even be detected, and the tuner cannot be used for tuning.

Second, since the audio signal emitted by the eardrum is usually a composite frequency, including a plurality of overtones other than the pitch, it is difficult to quickly and accurately detect the tympanic audio frequency.

Summary of the invention

One of the technical problems to be solved by the present invention is to provide a drum tuning method, which overcomes the defects that are easily interfered by environmental noise and affects the tuning accuracy in the method of tuning a tuner using the tympanic membrane vibration sound wave. .

The second technical problem to be solved by the present invention is to provide a drum tuner, which is easy to be disturbed by environmental noise by using the above-mentioned drum tuning method to overcome the existing tuning method using a tuner vibrating sound wave tuner. Defects that affect the accuracy of tuning.

The technical solution adopted by the present invention to solve one of the technical problems is: constructing a drum tuning method, which is characterized in that it comprises the following steps:

Si, emitting detection light to the detected position of the vibrating tympanic membrane to be tested, and receiving the detection light reflected by the tympanic membrane to be tested; 52. Perform signal amplification, sampling detection, filtering amplification, and shaping processing on the received detection light reflection signals in sequence;

53. Detecting a frequency of the shaped signal;

54. Output tuning related information.

In the drum tuning method of the present invention, the detection light is infrared rays or ultraviolet rays.

In the drum tuning method of the present invention, the output tuning related information is: outputting the detected frequency and a set drum reference frequency; or outputting the set drum reference frequency and the detection frequency and the reference frequency The difference.

In the drum tuning method of the present invention, the output tuning related information is: outputting the set drum reference frequency and the proximity of the detection frequency to the reference frequency.

The technical solution adopted by the present invention to solve the second technical problem is to provide a drum tuner, comprising: a housing, a signal amplifying circuit disposed in the housing, a sampling detection circuit, a band pass filter amplifier, a shaping circuit, an MCU, a driving circuit and a power source, a detecting light emitting device and a detecting light receiving device disposed on the housing, a detecting signal output device disposed on the housing or in the housing; the power source and the signal amplifying circuit respectively , a sampling detection circuit, a band pass filter amplifier, a shaping circuit, an MCU, a driving circuit, a detecting light emitting device, a detecting light receiving device, and a detecting signal output device are connected to the power supply;

The sampling detection circuit is a detection circuit capable of taking an envelope signal from the amplitude modulation wave;

The detection light emitting device and the detecting light receiving device have an optical path angle greater than or equal to 0° and less than 50°; the detecting light receiving device, the signal amplifying circuit, the sampling detecting circuit, the band pass filter amplifier, the shaping circuit, the MCU, and the driving circuit Detecting light emitting devices connected in sequence;

The MCU is connected to the sampling detection circuit and drives the sampling detection circuit for detecting; the MCU is connected to the detection signal output device to output tuning related information; and the MCU controls the driving circuit to drive the detection light emitting device to emit detection light.

In the drum tuner of the present invention, the sampling detection circuit includes an electronic analog switch 1, an electronic analog switch 2, an integrating capacitor 1, an integrating capacitor 2, and an operational amplifier, and the electronic analog switch 1 and the electronic analog switch 2 are respectively connected to the The positive and negative input terminals of the operational amplifier, one end of the integrating capacitor is grounded, and the other end is connected to the connection end of the electronic analog switch and the operational amplifier, and one end of the integrating capacitor The ground end and the other end are connected to the connection end of the electronic analog switch 2 and the operational amplifier; the electronic analog switch 1. The input end of the electronic analog switch 2 is an input end of the sampling detection circuit, and the output end of the operational amplifier is a sampling detection circuit Output.

In the drum tuner of the present invention, the sampling detection circuit includes a detection diode, a detection capacitor, and a detection resistor, and a cathode of the detector diode is connected in series at a first input end of the sampling detection circuit, and the detection capacitor and the detection resistor are respectively connected The negative end of the detection diode and the second input end of the sampling detection circuit, the two ends of the detection resistor are the output end of the sampling detection circuit.

In the drum tuner of the present invention, the detecting light emitting device and the detecting light receiving device are respectively an infrared light emitting device and an infrared light receiving device, or the detecting light emitting device and the detecting light receiving device are respectively ultraviolet light emitting Device and ultraviolet light receiving device.

In the drum tuner of the present invention, the detection signal output means is a display or a speaker. The drum tuning method and the tuner tuning method embodying the present invention are compared with the prior art, and the beneficial effects thereof are as follows:

1. Using light as the detection medium for tympanic membrane vibration, it is not affected by environmental noise, and overcomes the defects of the existing tuner that is tuned by sound waves, which are easily disturbed by environmental noise and affect the accuracy of tuning;

2. Using light as the detection medium of the tympanic membrane vibration, directly detecting the fundamental sound of the tympanic membrane vibration and tuning on the basis of the pitch, avoiding the tuner that uses the acoustic wave for tuning, can only detect the tympanic overtone and adjust on the basis of overtone. The sound, the defect of low tuning accuracy, the tuning accuracy is greatly improved.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a flow chart showing an embodiment of the drum tuning method of the present invention.

2 is a block diagram showing the structure of an embodiment of the drum tuner of the present invention.

Figure 3 is a schematic diagram of the detection of the drum tuner of the present invention.

4 is a circuit diagram of an embodiment of the sampling detection circuit of FIG. 2.

Figure 5 is a circuit diagram of another embodiment of the sample detection circuit of Figure 2.

detailed description

The invention will now be further described with reference to the drawings and embodiments. As shown in FIG. 1, the drum tuning method of the present invention comprises the following steps:

First, the detection position of the vibrating tympanic membrane (i.e., the drumhead) is emitted, and the detection light reflected by the tympanic membrane is received. The detection light is reflected by the vibrating tympanic membrane and then picks up the vibration signal of the tympanic membrane. The detection position is usually near the tension point of the drum.

Secondly, the received detection light reflection signal is sequentially subjected to signal amplification processing, sampling detection processing, filter amplification processing, and shaping processing to obtain an amplitude waveform of the vibration signal.

Third, detecting the frequency of the shaped signal. This frequency is the fundamental frequency of the tympanic membrane vibration. Fourth, according to the above detection frequency, output related information of the drum tuning.

The detection light of the method may be infrared rays or ultraviolet rays.

The output tuning related information of the method includes but is not limited to:

1. Output the detected frequency and the set drum reference frequency. The tuner judges the tuning of the tympanic membrane corresponding to the debugging point based on the detected detection frequency and the reference frequency and performs tuning.

2. Output the set drum reference frequency and the difference between the detection frequency and the reference frequency. The tuner judges the tuning of the tympanic membrane corresponding to the debugging point according to the output standard frequency and the difference between the detection frequency and the reference frequency, and performs tuning.

3. Output the set drum reference frequency and the proximity of the detection frequency to the reference frequency. The degree of proximity can be expressed by, for example, the depth of the color, the distance from the reference frequency, and the size of the sound. The tuner determines the tuning of the tympanic membrane corresponding to the debugging point based on the output reference frequency and the proximity of the detection frequency to the reference frequency and performs tuning.

The method of outputting the tuning related information of the method can adopt the video signal output or the audio signal output, and can achieve the object of the present invention.

As shown in FIG. 2 to FIG. 5, the drum tuner of the present invention comprises a housing (not shown), a signal amplifying circuit 2 disposed in the housing, a sampling detection circuit 3, a band pass filter amplifier 4, and shaping. The circuit 5, the MCU 8, the drive circuit 9 and the power source 6, the detecting light emitting device and the detecting light receiving device provided on the casing, and the detecting signal output device provided on the casing or in the casing. The power source 6 is connected to the signal amplification circuit 2, the sampling detection circuit 3, the band pass filter amplifier 4, the shaping circuit 5, the MCU 8, the driving circuit 9, the detecting light emitting device, the detecting light receiving device, and the detecting signal output device.

Detection light receiving device, signal amplifying circuit 2, sampling detecting circuit 3, band pass filter amplifier 4, The shaping circuit 5, the MCU 8, the drive circuit 9, and the detection light emitting device are sequentially connected.

The MCU 8 is connected to the sampling detection circuit 3, and drives the sampling detection circuit 3 for detection. The MCU 8 is connected to the detection signal output device to output tuning related information. The MCU 8 controls the drive circuit 9 to drive the detection light emitting device to emit detection light.

In this embodiment, the detecting light emitting device adopts the infrared emitting device 10, and the detecting light receiving device adopts the infrared receiving device 1, and the corresponding detecting light is infrared light. In other embodiments, the detecting light emitting device may employ an ultraviolet emitting device, and the detecting light receiving device may employ an ultraviolet receiving device. Correspondingly, in the embodiment, the detecting signal output device adopts the display 7, and outputs the detected data, color, Information such as graphics, the display 7 is placed on the housing of the drum tuner. In other embodiments, the detection signal output device may use a speaker for outputting audio detection information, such as reading the detection frequency, and the proximity of the detection frequency indicated by the sound level to the reference frequency, and the speaker may be set in the tone. The housing of the sounder can also be disposed on the housing.

The sampling detection circuit 3 samples a detection circuit capable of taking an envelope signal from the amplitude modulation wave, including but not limited to the following sampling detection circuit:

As shown in FIG. 4, the sampling detection circuit 3 adopts the following structure: the sampling detection circuit includes an electronic analog switch 31, an electronic analog switch 34, an integrating capacitor 32, an integrating capacitor 35, and an operational amplifier 33, and an electronic analog switch 31 and an electronic analog switch 34, respectively. The positive and negative input terminals of the operational amplifier 33 are connected. One end of the integrating capacitor 32 is grounded, and the other end is connected to the connection end of the electronic analog switch 31 and the operational amplifier 33. One end of the integrating capacitor 35 is grounded, and the other end is connected to the electronic analog switch 34 and the operational amplifier. The connection end of 33. Electronic analog switch 31. The input end of the electronic analog switch 34 is the input end of the sampling detection circuit, and the output end of the operational amplifier 33 is the output end of the sampling detection circuit.

As shown in FIG. 5, the sampling detection circuit 3 adopts the following structure: the sampling detection circuit includes a detection diode 36, a detection capacitor 37, and a detection resistor 38. The anode of the detection diode 36 is connected in series at the first input end of the sampling detection circuit, and the detection capacitor 37 and The detecting resistors 38 are respectively connected between the negative electrode of the detecting diode 36 and the second input end of the sampling detecting circuit, and both ends of the detecting resistor 38 are output terminals of the sampling detecting circuit.

As shown in FIG. 3, the angle between the light path of the detecting light emitting device and the detecting light receiving device is greater than or equal to The range of 0° is less than the equivalent of 50°. For example, the angles of the optical paths of the detecting light emitting device and the detecting light receiving device may be selected to be 5°, 10°, 15°, 20°, 25°, 30°, 35 40. 45. Wait'

Claims

A drum tuning method, characterized in that it comprises the following steps:

51. The detection position of the detected tympanic membrane of the vibration is emitted, and the detection light reflected by the tympanic membrane to be tested is received;

52. Perform signal amplification, sampling detection, filtering amplification, and shaping processing on the received detection light reflection signals in sequence;

53. Detecting a frequency of the shaped signal;

54. Output tuning related information.

The drum tuning method according to claim 1, wherein the detection light is infrared rays or ultraviolet rays.

The drum tuning method according to claim 1 or 2, wherein the output tuning related information is: outputting the detected frequency and a set drum reference frequency; or outputting the set drum reference a frequency and a difference between the detected frequency and the reference frequency.

The drum tuning method according to claim 1 or 2, wherein the output tuning related information is: outputting a set drum reference frequency and a proximity of the detection frequency to the reference frequency.

5. A drum tuner, comprising: a housing, a signal amplifying circuit disposed in the housing, a sampling detection circuit, a band pass filter amplifier, a shaping circuit, an MCU, a driving circuit, and a power supply, disposed in the case a detecting light emitting device and a detecting light receiving device on the body, a detecting signal output device disposed on the casing or in the casing; the power source and the signal amplifying circuit, the sampling detecting circuit, the band pass filter amplifier, the shaping circuit, the MCU , the driving circuit, the detecting light emitting device, the detecting light receiving device and the detecting signal output device are connected to the power supply;

The MCU is connected to the sampling detection circuit, and drives the sampling detection circuit for detecting; the MCU The drum tuner according to claim 5, wherein the sampling and detecting circuit comprises an electronic analog switch 1, an electronic analog switch 2, an integrating capacitor 1, an integrating capacitor 2, and an operational amplifier, and the electronic analog switch The electronic analog switch 2 is respectively connected to the positive and negative input terminals of the operational amplifier, one end of the integrating capacitor one is grounded, and the other end is connected to the connection end of the electronic analog switch and the operational amplifier, one end of the integrating capacitor two is grounded, and the other end is The input end of the electronic analog switch 2 and the operational amplifier is connected; the input end of the electronic analog switch 2 is an input end of the sampling detection circuit, and the output end of the operational amplifier is an output end of the sampling detection circuit.

The drum tuner according to claim 5, wherein the sampling detection circuit comprises a detection diode, a detection capacitor and a detection resistor, and a cathode of the detector diode is connected in series at a first input end of the sampling detection circuit, The detecting capacitor and the detecting resistor are respectively connected between the negative pole of the detecting diode and the second input end of the sampling detecting circuit, and the two ends of the detecting resistor are the output of the sampling detecting circuit

The drum tuner according to claim 5, wherein the detecting light emitting device and the detecting light receiving device are respectively an infrared light emitting device and an infrared light receiving device, or the detecting light emitting device and detecting The light receiving devices are respectively an ultraviolet light emitting device and an ultraviolet light receiving device.

The drum tuner according to any one of claims 5 to 8, wherein the detection signal output means is a display or a speaker.