CN211980190U

CN211980190U - Pickup

Info

Publication number: CN211980190U
Application number: CN201922059840.6U
Authority: CN
Inventors: 李晨晨; 李德成
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-11-25
Filing date: 2019-11-25
Publication date: 2020-11-20
Anticipated expiration: 2029-11-25

Abstract

The application provides a pickup which comprises a correlation type frequency detection device and a signal transmission processor, wherein the correlation type frequency detection device is arranged below the strings and is in one-to-one correspondence with the strings, and is used for acquiring the analog audio signal of each string and transmitting the analog audio signal to a signal processing transmitter; the signal processing transmitter is in communication connection with the correlation type frequency detection device and the sound source and is used for acquiring the frequency analog audio signal and converting each path of adjusted analog audio signal into a midi digital signal. By the technical scheme, the variable quantity of the magnetic flux of the coil is not required to be detected, the string instrument is suitable for all string instruments, and the microphone is not arranged, so that the audio signal cannot be fed back, and howling cannot be caused.

Description

Pickup

Technical Field

The application relates to the field of sound pick-up, in particular to a sound pick-up.

Background

The sound pickup is also called a listening head. The monitoring pickup is a device used for collecting the field environment sound and then transmitting the sound to the back-end equipment. There are three schemes for current pickup

One is a typical electric guitar coil magnet pickup, which achieves the purpose of picking up sound by changing the magnetic flux through the coil through string vibration, and the output signal is an analog audio signal but can only be used for metal strings.

The second is a digital pickup based on a magnet coil pickup by Roland (manufacturers and vendors of electronic musical instruments, Roland). The magnetic flux passing through the coil is changed by the vibration of the string, and the magnetic flux change analog signal is converted into a Digital midi (Musical Instrument Digital Interface) signal through an algorithm. But still only for metal strings.

The third is a microphone pickup, which is simply a microphone with a built-in musical instrument, and the output signal is an analog quantity, and although the microphone pickup can be used for all musical instruments, the microphone pickup has problems such as feedback causing howling.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned shortcomings of the current field of sound pickup, the present application provides a start sound method that can be used for all musical instruments without causing howling.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:

a pickup, comprising:

the string instrument is provided with a plurality of strings for playing;

the correlation type frequency detection device is arranged below the strings, corresponds to the strings one by one, and is used for acquiring the analog audio signal of each string and transmitting the analog audio signal to the signal processing transmitter;

and the signal processing transmitter is in communication connection with the correlation type frequency detection device and the sound source and is used for acquiring the frequency analog audio signal, converting each path of regulated analog audio signal into a midi digital signal and transmitting the midi digital signal to the sound source.

The correlation frequency detection device refers to a detection device that can emit an initial signal and receive a detection signal, for example, an active infrared sensor. This application is through the below one-to-one setting correlation formula frequency detection device at every string, correlation formula frequency detection device launches signal earlier, then detect the frequency and the amplitude that detect the string through the signal of string reflection again, and then change the frequency and the amplitude of string into analog audio signal, the rethread signal processing changer converts analog audio signal into midi digital signal and exports, need not to detect the variable quantity of coil magnetic flux, can be applicable to all stringed instruments, and there is not the microphone, audio signal can't be fed back, can not cause to whistle.

Preferably, the correlation frequency detection device is an active infrared sensor or a dual-probe ultrasonic sensor. The active infrared sensor is used for combining a pair of devices for transmitting infrared rays and receiving infrared rays together to form an infrared ray correlation system. If the invisible light path between the infrared transmitting and receiving systems is blocked, the receiving device can immediately detect the blocking, a signal is sent out quickly to remind that the light path is blocked, and the principle is utilized to detect the frequency and the amplitude of the string. The double-probe ultrasonic sensor consists of a transmitting sensor (or called wave transmitter), a receiving sensor (or called wave receiver), a control part and a power supply part, wherein the transmitting sensor usually consists of a transmitter and a ceramic vibrator transducer with the diameter of about 15mm, and the transducer is used for converting the electric vibration energy of the ceramic vibrator into super energy and radiating the super energy to the control part; the receiving sensor is composed of a ceramic oscillator transducer and an amplifying circuit, the transducer receives waves to generate mechanical vibration, converts the mechanical vibration into electric energy to be used as the output of a sensor receiver, and accordingly detects the transmitted ultrasonic waves.

Preferably, the signal processing changer includes casing, circuit board, audio interface, sound source interface and power source, the circuit board sets up inside the casing, the audio interface the sound source interface with power source all with the circuit board is connected, the audio interface with correlation formula frequency detection device connects, the sound source interface with the sound source is connected, power source is connected with the power. The arrangement of the shell enables the circuit board of the signal transmission processor to be more conveniently connected with the correlation type frequency detection device and the sound source.

Preferably, the signal processing transmitter is further provided with a USB interface, and the USB interface is connected with the circuit board and used for realizing communication connection between the upper computer and the signal processing transmitter. The upper computer can be a computer, a smart phone and the like, and the signal transmission processor is conveniently arranged.

Preferably, the sound source is a hard sound source or a soft sound source. The hard sound source generally means that the sound card integrates the sound color library on a chip, and the sound card is directly played during playback, so that system resources (such as a CPU) are not basically occupied. Its advantages are high speed and no delay; the disadvantage is non-uniformity. The soft sound source is independent of hardware, and the software calculates the playback of the generated sound. They are usually based on wavetable technology, i.e. various timbres are recorded in table form, then "table look-up" is performed on the music, and then some envelope calculation is performed, so as to realize playback.

Preferably, the stringed musical instruments include a zither, guitar, harp, lute, violin, viola, cello, or urheen, and the like. The stringed musical instrument can be of various types.

A sound pickup method is used for the sound pickup, and comprises the following steps:

acquiring a simulated audio signal of each string;

adjusting the power amplification ratio of each path of analog audio signal to carry out power amplification, so that the output power of each path of analog audio signal is the same;

and converting the analog audio signal after power amplification into a first midi digital signal and outputting the first midi digital signal to a sound source.

The analog audio signals of the strings are collected by the aid of the plurality of correlation type signal processing transmitters and are converted into midi digital signals through the digital signal transmitters to be output, the variable quantity of magnetic flux of the coil does not need to be detected, the string instrument is suitable for all string instruments, a microphone is not arranged, the audio signals cannot be fed back, and howling cannot be caused.

Wherein the first midi digital signal is: each path of the analog audio signal is formed corresponding to a midi digital signal channel; or each analog audio signal is respectively corresponding to different midi digital signal channels. If the first midi digital signal is formed by corresponding each path of analog audio signal to one midi digital signal channel, the output method cannot identify the same tone generated by a plurality of strings, and is suitable for musical instruments with relatively fixed pitches of each string, such as a Chinese zither; the first midi digital signal is formed by respectively corresponding each path of analog audio signal to different midi digital signal channels, and each string can correspond to different sound sources so as to generate very rich timbre change.

The pickup method further comprises bending sound processing, wherein the bending sound processing specifically comprises the following steps:

acquiring the pitch of the analog audio signal of the string and the pitch of the first midi digital signal;

if the absolute value of the difference between the pitch of the analog audio signal and the pitch of the first midi digital signal is less than a preset bend trigger value, if so, outputting the first midi digital signal; if not, outputting a second midi digital signal, wherein if the pitch of the first midi digital signal is greater than the pitch of the analog audio signal, the pitch of the second midi digital signal is the pitch of the first midi digital signal minus the preset bend trigger value; if the pitch of the first midi digital signal is less than the pitch of the analog audio signal, the pitch of the second midi digital signal is the pitch of the first midi digital signal plus the preset bend trigger value.

Through the bending processing, the pitch of the output midi digital signal can be consistent with the pitch of the analog audio signal as much as possible, and the loss of the audio quality in the signal conversion process is corrected.

The application has the advantages that: the application provides a pickup and a pickup method, wherein the pickup comprises a correlation type frequency detection device and a signal transmission processor, the correlation type frequency detection device is arranged below the string and is in one-to-one correspondence with the string, and is used for acquiring the analog audio signal of each string and transmitting the analog audio signal to a signal processing transmitter; the signal processing transmitter is in communication connection with the correlation type frequency detection device and the sound source and is used for acquiring the frequency analog audio signal and converting each path of adjusted analog audio signal into a midi digital signal. By the technical scheme, the variable quantity of the magnetic flux of the coil is not required to be detected, the string instrument is suitable for all string instruments, and the microphone is not arranged, so that the audio signal cannot be fed back, and howling cannot be caused.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a sound pickup according to an embodiment of the present application;

fig. 2 is a schematic flow chart illustrating a sound pickup method according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

As shown in fig. 1, a sound pickup includes:

a stringed instrument provided with a plurality of strings 1 for playing;

the correlation type frequency detection device 2 is arranged below the strings 1, is in one-to-one correspondence with the strings 1, and is used for acquiring an analog audio signal of each string 1 and transmitting the analog audio signal to the signal processing transmitter 3;

and the signal processing transmitter 3 is in communication connection with the correlation frequency detection device 2 and the sound source, and is used for acquiring the frequency analog audio signal, converting each path of the adjusted analog audio signal into a midi digital signal and transmitting the midi digital signal to the sound source.

The correlation frequency detection device 2 refers to a detection device that can emit an initial signal and receive a detection signal, for example, an active infrared sensor. This application is through setting up correlation formula frequency detection device 2 at every string 1's below one-to-one, correlation formula frequency detection device 2 launches signal earlier, then detect the frequency and the amplitude that detect string 1 through the signal of string 1 reflection again, and then change string 1's frequency and amplitude into analog audio signal, rethread signal processing changer 3 converts analog audio signal into midi digital signal and exports, need not the change amount of detection coil magnetic flux, can be applicable to all stringed instruments, and do not have the microphone, audio signal can't be given back to, can not arouse to whistle.

The correlation frequency detection device 2 can be an active infrared sensor or a dual-probe ultrasonic sensor; the sound source is a hardware sound source or a software sound source; including a zither, guitar, harp, lute, violin, viola, cello, or urheen, among others. The stringed musical instrument can be of various types.

Signal processing changer 3 includes casing 31, circuit board, audio interface 32, sound source interface 33 and power source 34, the circuit board sets up inside casing 31, audio interface 32 sound source interface 33 with power source 34 all with the circuit board is connected, audio interface 32 with correlation formula frequency detection device 2 connects, sound source interface 33 with the sound source is connected, power source 34 is connected with the power. The housing 31 is arranged to allow the signal to be transmitted to the processor.

In some embodiments of the present application, in order to set up the signal transmission processor, the signal processing transmitter 3 is further provided with a USB interface 35, the USB interface 35 is connected to the circuit board, and is used for realizing communication connection between the upper computer and the signal processing transmitter 3. The upper computer can be a computer, a smart phone and the like.

A sound pickup method, for use in the sound pickup, as shown in fig. 2, includes the steps of:

s1, acquiring the analog audio signal of each string 1;

s2, adjusting the power amplification ratio of each path of analog audio signal to carry out power amplification, so that the output power of each analog audio signal is the same;

and S3, converting the analog audio signal after power amplification into a first midi digital signal and outputting the midi digital signal to a sound source.

The analog audio signals of the strings 1 are collected by the aid of the plurality of correlation type signal processing transmitters 3 and are converted into midi digital signals through the digital signal transmitters to be output, the magnetic flux variation of the strings is not required to be detected, the acoustic wire is suitable for all stringed instruments, a microphone is not arranged, the audio signals cannot be fed back, and howling cannot be caused.

The signal processing transmitter 3 firstly sets the signal output scaling, the vibration amplitude of the string 1 is not consistent due to the habit of a player with the thickness of the string 1, and the like, and the signal processing transmitter 3 outputs the analog audio signal after adjusting the output scaling of the frequency of the analog audio signal, so that the output audio signal can be stable. In the specific operation process, a player firstly fluctuates the strings 1 in a normal mode, the scaling of each path of analog audio signal is set, and then the output quantity of the signals which are normally stirred by all the strings 1 is adjusted to be consistent.

When the pickup is used for a musical instrument such as a Chinese zither with each string 1 having a relatively fixed pitch, the first midi digital signal is formed by corresponding each path of the analog audio signal to one midi digital signal channel; or each analog audio signal is respectively corresponding to different midi digital signal channels. When the pickup is used for other stringed instruments, the first midi digital signal can be formed by respectively corresponding each path of the analog audio signal to different midi digital signal channels, and each string 1 can correspond to different sound sources so as to generate very rich timbre changes.

In addition, in some other embodiments of the present application, the sound pickup method further includes a bending sound process, where the bending sound process specifically includes:

s4, acquiring the pitch of the analog audio signal of the string 1 and the pitch of the first midi digital signal;

s5, if the absolute value of the difference between the pitch of the analog audio signal and the pitch of the first midi digital signal is smaller than the preset bend trigger value, if so, outputting the first midi digital signal; if not, outputting a second midi digital signal, wherein if the pitch of the first midi digital signal is greater than the pitch of the analog audio signal, the pitch of the second midi digital signal is the pitch of the first midi digital signal minus the preset bend trigger value; if the pitch of the first midi digital signal is less than the pitch of the analog audio signal, the pitch of the second midi digital signal is the pitch of the first midi digital signal plus the preset bend trigger value.

Due to the conversion of the signal, the pitch of the first midi digital signal output may not exactly coincide with the pitch of the analog audio signal. For example, when a string 1 is actually played, the actual pitch of the analog audio signal is 442hz, but the pitch of the first midi digital signal outputted after digital-to-analog conversion is 440hz, and if the bending mode is not turned on, without bending processing, the analog audio signal with the pitch of 442hz is fitted to the first midi digital signal with the pitch of 440 hz. If the bending mode is started and the preset bending trigger value is 2Hz, the difference value of the pitch of the first midi digital signal and the pitch of the analog audio signal is 2Hz and is equal to the preset bending trigger value, a second midi digital signal is output, the second midi digital signal is synthesized by the first midi digital signal and the bending signal, the pitch of the second midi digital signal is the sum of the first midi digital signal and the preset bending trigger value 442Hz, through bending processing, the finally output midi digital signal is consistent with the pitch of the analog audio signal as much as possible, and the loss of the audio quality in the signal conversion process is corrected.

Furthermore, the effect of the audio output can be adjusted by the tremolo, which can be output in the form of a midi signal plus a continuously jittery curved tone signal, for example.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present disclosure should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A pickup for a stringed musical instrument having a plurality of strings for playing, comprising:

and the signal processing transmitter is in communication connection with the correlation frequency detection device and the sound source and is used for acquiring the analog audio signals, converting each path of regulated analog audio signals into midi digital signals and transmitting the midi digital signals to the sound source.

2. The pickup of claim 1, wherein the correlation frequency detection device is an active infrared sensor or a dual probe ultrasonic sensor.

3. The pickup of claim 1, wherein the signal processing transducer comprises a housing, a circuit board, an audio interface, an audio source interface, and a power source interface, the circuit board is disposed inside the housing, the audio interface, the audio source interface, and the power source interface are all connected to the circuit board, the audio interface is connected to the correlation frequency detection device, the audio source interface is connected to the audio source, and the power source interface is connected to the power source.

4. The pickup of claim 1, wherein the signal processing transducer is further provided with a USB interface, and the USB interface is connected with a circuit board and used for realizing communication connection between an upper computer and the signal processing transducer.

5. The pickup of claim 1, wherein the sound source is a hardware sound source or a software sound source.

6. The pickup of claim 1, wherein the stringed musical instrument comprises a zither, guitar, harp, lute, violin, viola, cello, or urheen.