CN106683653A - Touch key signal multi-channel processing circuit for piezoelectric electret flexible film electronic organ and method thereof - Google Patents
Touch key signal multi-channel processing circuit for piezoelectric electret flexible film electronic organ and method thereof Download PDFInfo
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- CN106683653A CN106683653A CN201710114143.9A CN201710114143A CN106683653A CN 106683653 A CN106683653 A CN 106683653A CN 201710114143 A CN201710114143 A CN 201710114143A CN 106683653 A CN106683653 A CN 106683653A
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H1/00—Details of electrophonic musical instruments
- G10H1/32—Constructional details
- G10H1/34—Switch arrangements, e.g. keyboards or mechanical switches specially adapted for electrophonic musical instruments
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H1/00—Details of electrophonic musical instruments
- G10H1/02—Means for controlling the tone frequencies, e.g. attack or decay; Means for producing special musical effects, e.g. vibratos or glissandos
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H1/00—Details of electrophonic musical instruments
- G10H1/46—Volume control
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Electrophonic Musical Instruments (AREA)
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Abstract
The invention discloses a touch key signal multi-channel processing circuit for a piezoelectric electret flexible film electronic organ and a method thereof; every key is provided with a piezoelectric electret sensor, and the sensor can generate the touch key signal when corresponding key is pressed down; a signal judging channel circuit generates an external interruption signal when the touch key signal is happened, thus the single chip circuit is started, and the single chip circuit performs the key scanning through a channel selecting switch circuit, opens the key channel which generating the touch key signal, and sends the processed touch key signal to the single chip circuit to calculate through a signal processing circuit. Through arranging the signal judging channel circuit and the signal selecting treatment channel circuit, corresponding channel can be rapidly and accurately selected, and the touch key signal is collected. The circuit and method can rapidly detect corresponding group and key generated by the touch key signal, avoid interference of the touch key signal of other keys, improve the accuracy of the output sound, and reduce the environment influence on the sound.
Description
Technical field
The present invention relates to electrophonic musical instrument technical field, more particularly to a kind of touching signal band-wise processing for electronic organ
Method and its circuit.
Background technology
Electronic organ is also referred to as electronic keyboard, and pronunciation volume can be adjusted freely, with range it is wider, harmony is abundant, can mould
The advantages of imitating various tone colors, the beat accompaniment of similar percussion sound can be equipped with and effect device is installed additional, in contemporary music performance
Using quite varied.With electronic organ sound cannot be associated for key touching depth and touching speed by traditional electronic organ, played
During, the melody of electronic organ is excessively single with harmony, lacks volume change.And piezoelectric electret material is used as sensor
Piezo-electric electret fexible film electronic organ then overcome the defect of conditional electronic qin, be greatly enriched the music table of electronic organ
Existing power.But, because piezoelectric electret material has larger internal resistance, piezo-electric electret fexible film electronic organ is easily received
External environment condition vibration influence, it is difficult to extract effective qin message number.In addition, current electronic organ band-wise processing design also cannot be accurate
Really extract qin message number, the volume and tone color of precise control qin sound.
As Chinese Patent Application No. be 03273498.0, disclose it is a kind of can by key press control volume electronics
Qin, the conductive adhesive tape used in the music key of the electronic organ includes multiple staggered vertically insulated layers and vertical conduction
Layer, and be provided with the top of it for by each vertical conduction layer mutually short circuit shorting conductive layer；The base portion of the conductive adhesive tape
It is supported on circuit board with dividing, input signal cable and a plurality of output signal is provided with the circuit board that conductive adhesive tape bottom is faced
Line；Its bottom is deformed after the conductive adhesive tape is pressurized, and makes the Area of bearing between its bottom and circuit board with the increase of pressure
And gradually increase so that can in turn switch on first, second, until the last item output signal line；According to for being wherein switched on
One output signal line can synthesize note signal, and corresponding volume letter can be then synthesized according to the output signal lines number being switched on
Number.The weight of contact conducting and then induced key of the structure by conductive adhesive tape bottom with output signal line, makes complicated, holds
Easily judge inaccurate, cause qin sound inaccurate or noise situation.
The content of the invention
The technical problems to be solved by the invention are a kind of for piezo-electric electret fexible film electronic organ, and can be quick accurate
Qin message number is really extracted, ambient influnence is reduced, the band-wise processing circuit and its method of the qin change of tune is controlled.
The present invention solve the technical scheme that is used of above-mentioned technical problem for：
For the touching signal band-wise processing circuit of piezo-electric electret fexible film electronic organ, the touching signal leads to more
Road process circuit includes that multiple is respectively connecting to the packet circuit of single chip circuit, and packet circuit described in every group differentiates including signal
Channel circuit, signal behavior treatment channel circuit and the piezo-electric electret corresponding with key number on electronic organ key are passed
Sensor, the signal behavior treatment channel circuit includes the channel selector switch circuit and the signal processing circuit that are sequentially connected in series；Often
The output end of the piezo-electric electret sensor on the group packet circuit is respectively connected to the signal and differentiates passage electricity
Road and the input of the channel selector switch circuit, the signal differentiate the output end and the single chip circuit of channel circuit
Connection, the output end of the channel selector switch circuit is connected to the single chip circuit through the signal processing circuit, described
Control signal output of the channel selector switch circuit also with the single chip circuit is connected；The channel selection circuit includes many
Paths controlling switch, the output end of the piezo-electric electret sensor is distinguished with the input of the multiplexer channel controlling switch
Connect one to one, the piezo-electric electret sensor produces touching signal when correspondence key is pressed.
Preferably, the signal differentiates that channel circuit includes integrating capacitor, first resistor, second resistance, adjustable resistance, ratio
Compared with device and logical-arithmetic unit, the piezo-electric electret sensor is grounded after being connected with the integrating capacitor；The comparator is just
Phase input is connected on the piezo-electric electret sensor, and described second that the inverting input of the comparator is concatenated is electric
It is grounded after resistance and the adjustable resistance, the output end of the comparator is connected with the input of the logical-arithmetic unit, the ratio
Compared with being in series with the first resistor between device power end and output end.
Preferably, the signal processing circuit includes the charge amplifying circuit, low-pass filter circuit, the high pass filter that are sequentially connected in series
Wave circuit, 50Hz trap circuits, multistage amplifier circuit circuit, level lifting circuit and amplitude limiter circuit.
As described for the treatment of the touching signal band-wise processing circuit structure of piezo-electric electret fexible film electronic organ
Method, comprises the steps：1) electronic organ key is equally divided into some packets, one packet circuit of every group of correspondence；2)
Touching signal is detected whether by the single-chip microcomputer；3) by the monolithic machine testing occur touching signal belonging to
Packet；4) corresponding key passage is opened by the multiplexer channel controlling switch of respective packets, detection produces touching signal
Key；5) single-chip microcomputer is sent into after the signal processing circuit is by touching signal transacting；6) entered by the single-chip microcomputer
The calculating of the frequency and amplitude of row touching signal.
In order to reduce the load of single-chip microcomputer, step 2) in, the touching signal in every group of key produces corresponding outer when occurring
Portion's interrupt signal, determines whether that touching signal occurs by external interrupt signal described in the monolithic machine testing.
In order that being independent of each other between touching signal, accelerate single-chip microcomputer processing speed, step 3) in, the single-chip microcomputer passes through
External interrupt signal determines the packet that touching signal occurs, and in step 4) in controlled by the multiplexer channel of the packet
Switch carries out the key that key scanning produces touching signal to detect.
In order to reduce environmental vibration influence, step 6) in, single-chip microcomputer is provided with when calculating for excluding low-voltage fluctuation institute
Interference voltage threshold value is exempted from the interference of generation, when detect touching signal voltage exceed it is described exempt from interference voltage threshold value when, then remember
The lower very first time；When signal voltage rises, and be re-lowered to it is described then write down for the second time when exempting from interference voltage threshold value, lead to
The frequency of touching signal is calculated after the time difference of time twice, and according to touching signal peak crest voltage, show that touching is believed
Number amplitude.
For precise control qin sound tone color and volume, step 6) in, the FREQUENCY CONTROL qin sound tone of the touching signal
Output, qin sound tone increases with the quickening of the frequency；The amplitude of the touching signal controls the output of qin sound volume, qin
Sound volume increases as the amplitude increases；The change and the change joint effect qin change of tune of the volume of the qin sound tone
Change.
Compared with prior art, the advantage of the invention is that by the setting of signal discrimination circuit and channel selector switch,
Respective packets and key that quick detection touching signal occurs, it is to avoid the touching signal interference of other keys, improve output qin
The accuracy of sound.The present invention also exempts from interference threshold voltage by setting, reduces environment for the influence of qin sound, further improves qin
Sound expressive force.
Brief description of the drawings
Fig. 1 is the touching signal band-wise processing electricity for piezo-electric electret fexible film electronic organ of the embodiment of the present invention
The function box schematic diagram of the one of which packet circuit in road.
Fig. 2 is the touching signal band-wise processing electricity for piezo-electric electret fexible film electronic organ of the embodiment of the present invention
Signal in road differentiates the circuit diagram of channel circuit.
Fig. 3 is the touching signal band-wise processing electricity for piezo-electric electret fexible film electronic organ of the embodiment of the present invention
The function box schematic diagram of the signal processing circuit in road.
Fig. 4 is the touching signal band-wise processing side for piezo-electric electret fexible film electronic organ of the embodiment of the present invention
In method during touching sensor output signal schematic diagram.
Fig. 5 is the touching signal band-wise processing side for piezo-electric electret fexible film electronic organ of the embodiment of the present invention
The schematic flow sheet of method.
Specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing embodiment.
As Figure 1-3, the invention provides the touching signal multichannel for piezo-electric electret fexible film electronic organ
Process circuit, the touching signal band-wise processing circuit includes that multiple is respectively connecting to the packet circuit of single chip circuit 5, every group
Packet circuit include signal differentiate channel circuit 1, signal behavior treatment channel circuit 2 and on electronic organ key and key
The corresponding piezo-electric electret sensor of number, signal behavior treatment channel circuit 2 includes the channel selector switch electricity being sequentially connected in series
Road 3 and signal processing circuit 4.
The output end of the piezo-electric electret sensor on every group of packet circuit is respectively connected to signal and differentiates channel circuit 1
Output end with the input of channel selector switch circuit 3, and signal differentiation channel circuit 1 connects with the single chip circuit 5
Connect, the output end of channel selector switch circuit 3 is connected to the single chip circuit 5, channel selecting through the signal processing circuit 4
Control signal output of the on-off circuit 3 also with single chip circuit 5 is connected.Channel selection circuit 2 includes that multiplexer channel control is opened
Close, the output end of piezo-electric electret sensor connects one to one respectively with the input of the multiplexer channel controlling switch.
For using 88 keys or 61 keys piezo-electric electret fexible film electronic organ, the present embodiment is with 88 road key electronic organs more
As a example by.11 groups are equally divided into by by 88 road keys, 11 groups of packet circuits in parallel are formed, every group of packet circuit includes 8 qins
Key, the sensor on key can produce touching signal when corresponding key is pressed.When key is pressed, sensor can be produced
Touching signal, signal differentiates that channel circuit 1 produces external interrupt signal when touching signal occurs, and starts single chip circuit 5, makes
The control passage selected on-off circuit 3 of single chip circuit 5 carries out key scanning, opens the key passage for producing corresponding touching signal,
And after signal processing circuit 4 is by touching signal transacting single chip circuit 5 is delivered to be calculated.
As shown in Fig. 2 signal differentiates that channel circuit 1 includes integrating capacitor C1, first resistor R1, second resistance R2, adjustable
Resistance RP, comparator U1A and logical-arithmetic unit U2.Key sensor is grounded after being connected with integrating capacitor C1, for piezoelectricity to be stayed
The quantity of electric charge on electret sensor is integrated, and is converted to voltage, comparator U1A is acquired.Comparator U1A's
Normal phase input end is connected on a sensor, second resistance R2 and adjustable resistance RP that the inverting input of comparator U1A is concatenated
After be grounded, the output end of comparator U1A is connected with the collection pin P2.0 of logical-arithmetic unit U2, comparator U1A power ends and defeated
Go out between holding and be in series with first resistor R1.Wherein, first resistor R1 can be pulled up the delivery outlet of comparator U1A, make to patrol
Collecting arithmetic unit U2 can gather the signal of comparator U1A outputs, and second resistance R2 and adjustable resistance RP is used to adjust comparator U1A
Reference voltage.In order to relay protective scheme arithmetic unit U2 and comparator U1A, both power ends are equipped with decoupling filter circuit, this goes
Coupling filter circuit is made up of decoupling capacitor C2 and C3 respectively.Comparator U1A is used to be compared with the voltage mutually with anti-phase input,
Export the voltage of 0 or VCC.The present embodiment is using four comparator LM2901 and the logical-arithmetic unit of eight input channel NAND gates
74HC30。
Wherein, when having key to press in each group, touching signal is produced, and makes the comparator U1A of respective packets successively
Output voltage with logical-arithmetic unit U2 is changed into high voltage from low-voltage, and then single-chip microcomputer input voltage is also changed into high voltage,
Produce external interrupt signal.
The output end of multiplexer channel controlling switch is connected to the input of single chip circuit 5 through signal processing circuit 4.Monolithic
The control signal output on electromechanical road 5 is connected with multiplexer channel controlling switch, and qin is carried out for starting multiplexer channel controlling switch
Key scanning.
As shown in figure 3, signal processing circuit 4 includes the charge amplifying circuit, low-pass filter circuit, the high pass filter that are sequentially connected in series
Wave circuit, 50Hz trap circuits, multistage amplifier circuit circuit, level lifting circuit and amplitude limiter circuit.Wherein：
Channel selector switch circuit, including multiplexer channel controlling switch device, switch key passage under Single-chip Controlling, use
In key scanning, the key switch of corresponding touching signal is opened；
Charge amplifying circuit, by the faint quantity of electric charge change on the piezo-electric electret sensor of electronic organ because of data-collection generation
Voltage is changed to, for late-class circuit treatment；
Low-pass filter circuit, is to include that integrated operational amplifier is low with the multichannel gain feedback formula quadravalence of peripheral Resistor-Capacitor Unit
Bandpass filter circuit, cut-off frequency is 30Hz, and resistance band attenuation is more than 40dB, for filtering coupling in useless noise signal and circuit
The 50Hz power frequencies of conjunction；
High-pass filtering circuit, is the multichannel gain feedback formula quadravalence high pass for including integrated operational amplifier periphery Resistor-Capacitor Unit
Filter circuit, cut-off frequency is 0.5Hz, and resistance band attenuation is more than 15dB, for filtering the slow change interference signal less than 0.5Hz
And hinder direct current signal；
50Hz trap circuits, are the twin-T network trap circuit for including integrated operational amplifier and peripheral Resistor-Capacitor Unit, center
Frequency is 50.02Hz, with a width of 1Hz, further filters out the 50Hz power frequencies coupled in circuit；
Multistage amplifier circuit, is that the reverse ratio of multistage for including the how peripheral Resistor-Capacitor Units of integrated operational amplifier LM358 is put
Big circuit, gain amplifier is 20-1000, for faint touching signal to be amplified to V step voltage levels；
Level lifting circuit, including integrated operational amplifier and peripheral Resistor-Capacitor Unit, for lifting the straight of amplified signal
Flow point place value, enables the single-chip microcomputer in later stage to gather；
Amplitude limiter circuit, carries out voltage amplitude limit, it is to avoid signal peak-to-peak value is larger and exceedes the magnitude of voltage that single-chip microcomputer is allowed, to list
Piece machine collection input pin is protected.
When key is pressed, touching signal compares the level of output VCC by comparator U1A, and then changes logic successively
The output voltage of arithmetic unit U2 and the input voltage of single-chip microcomputer, produce external interrupt signal, triggering single-chip microcomputer to start.Meanwhile, it is single
Piece machine is judged to be grouped belonging to touching signal also by external interrupt signal, starts the multiplexer channel controlling switch of the group, passes through
The multiplexer channel controlling switch opens whether key Air conduct measurement has touching signal, until be switched to producing corresponding touching signal
Key passage.Touching signal by the quantity of electric charge by after key passage, through charge amplifying circuit, being converted to voltage, and then deliver to
Low-pass filter circuit, high-pass filtering circuit and 50Hz trap circuits filtering out the interference signal beyond 0.5-30Hz, then through many
Output signal peak-to-peak value is the touching signal of 1-2V after level amplifying circuit and level lifting circuit, and the touching signal is by amplitude limit electricity
Single-chip microcomputer is sent into behind road.
As shown in figure 5, present invention also offers the above-mentioned touching for piezo-electric electret fexible film electronic organ of application
The processing method of signal band-wise processing circuit structure, is equally divided into multiple packets, every group of correspondence one by electronic organ key first
Individual above-mentioned packet circuit；Touching signal is detected whether secondly by single-chip microcomputer；Then occur by monolithic machine testing
The affiliated packet of touching signal；And corresponding key passage is opened by the multiplexer channel controlling switch of respective packets, detection is produced
The key of raw touching signal；Then single-chip microcomputer is sent into after signal processing circuit 4 is by touching signal transacting；Finally by monolithic
Machine carries out the calculating of the frequency and amplitude of touching signal.
The touching signal band-wise processing method is comprised the following steps that：
1), it is grouped.The key of the present embodiment Zhong Jiang No. 88 electronic organs is equally divided into 11 groups, and every group includes 8 keys.Each
Key all has a piezo-electric electret sensor, and when key is pressed, sensor can produce corresponding touching signal.
2), determine whether that touching signal occurs.When there is key to press, sensor produces touching signal, touching letter
Number differentiate that channel circuit 1 produces external interrupt signal, single-chip microcomputer to believe by gathering the external interrupt by the signal of respective packets
Number to determine whether touching signal produces, so that starting single-chip microcomputer carries out key scanning, next step is carried out.If oncontacting key signals
Occur, single-chip microcomputer is not taken action then.
3) specific packet, is detected.Single-chip microcomputer determines the packet that touching signal occurs by external interrupt signal, so as to start
Multiplexer channel controlling switch in the channel selector switch circuit 3 of respective packets carries out key scanning, produces touching to believe to detect
Number key.
4) specific key, is detected.Multiplexer channel controlling switch opens key passage, gathers the signal in corresponding passage,
If the passage oncontacting key signals, switch key passage, until under detecting that corresponding touching signal makes touching signal pass through to enter
One step.
5) touching signal, is gathered.Touching signal after the treatment of signal processing circuit 4 by sending into single-chip microcomputer.
6) amplitude and frequency of touching signal, are calculated.Schematic diagram such as Fig. 4 is calculated, abscissa represents the electronic organ working time,
Ordinate represents the output voltage of key sensor, and A peaks are the ripple that sensor output voltage changes with time when pressing key
Shape figure, B peaks are the oscillogram that sensor output voltage is changed over time when discharging key, and Vth is for excluding low-voltage fluctuation
Interference voltage threshold value is exempted from produced interference.When touching signal voltage is detected more than Vth, then the time now is write down,
It is very first time t1；When signal voltage rises, and when being re-lowered to Vth, then the time now is write down, be the second time t2.
The frequency of touching signal can be calculated by t2-t1, i.e., frequency=1/ (t2-t1).Meanwhile, according to touching signal peak-to-peak value electricity
Pressure V0, you can draw the amplitude of touching signal, i.e. amplitude=V0.
Wherein, the output of the FREQUENCY CONTROL qin sound tone of touching signal, qin sound tone is with the quickening of touching signal frequency
And increase.Amplitude controls the output of qin sound volume, and qin sound volume increases as touching signal amplitude increases.The change of qin sound tone
Change the change joint effect qin change of tune with volume.
General principle of the invention, principal character and advantages of the present invention has been shown and described above.The technology of the industry
Personnel it should be appreciated that the present invention is not limited to the above embodiments, simply explanation described in above-described embodiment and specification this
The principle of invention, various changes and modifications of the present invention are possible without departing from the spirit and scope of the present invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.
Claims (8)
1. the touching signal band-wise processing circuit of piezo-electric electret fexible film electronic organ is used for, it is characterised in that：It is described to touch
Key signals band-wise processing circuit is respectively connecting to the packet circuit of single chip circuit (5) including multiple, and electricity is grouped described in every group
Road is individual with key including signal differentiation channel circuit (1), signal behavior treatment channel circuit (2) and on electronic organ key
The corresponding piezo-electric electret sensor of number, the signal behavior treatment channel circuit (2) is opened including the channel selecting being sequentially connected in series
Powered-down road (3) and signal processing circuit (4)；
The output end of the piezo-electric electret sensor on packet circuit described in every group is respectively connected to the signal and differentiates
The input of channel circuit (1) and the channel selector switch circuit (3), the signal differentiates the output end of channel circuit (1)
It is connected with the single chip circuit (5), the output end of the channel selector switch circuit (3) is through the signal processing circuit (4)
The single chip circuit (5) is connected to, the channel selector switch circuit (3) is also believed with the control of the single chip circuit (5)
The connection of number output end；The channel selection circuit (2) includes multiplexer channel controlling switch, the piezo-electric electret sensor it is defeated
Go out end to be connected one to one respectively with the input of the multiplexer channel controlling switch, the piezo-electric electret sensor is in correspondence
Touching signal is produced when key is pressed.
2. the touching signal band-wise processing circuit of piezo-electric electret fexible film electronic organ is used for as claimed in claim 1,
It is characterized in that：The signal differentiate channel circuit (1) including integrating capacitor (C1), first resistor (R1), second resistance (R2),
Adjustable resistance (RP), comparator (U1A) and logical-arithmetic unit (U2), the piezo-electric electret sensor and the integrating capacitor
(C1) it is grounded after connecting；The normal phase input end of the comparator (U1A) is connected on the piezo-electric electret sensor, the ratio
The second resistance (R2) and the adjustable resistance (RP) being concatenated compared with the inverting input of device (U1A) are grounded afterwards, the ratio
Output end compared with device (U1A) is connected with the input of the logical-arithmetic unit (U2), comparator (U1A) power end and output
The first resistor (R1) is in series between end.
3. the touching signal band-wise processing for piezo-electric electret fexible film electronic organ as described in claim 1 or 4 is electric
Road, it is characterised in that：The signal processing circuit (4) includes the charge amplifying circuit, low-pass filter circuit, the high pass that are sequentially connected in series
Filter circuit, 50Hz trap circuits, multistage amplifier circuit circuit, level lifting circuit and amplitude limiter circuit.
4. the touching signal band-wise processing circuit knot of piezo-electric electret fexible film electronic organ is used for as claimed in claim 1
The processing method of structure, it is characterised in that：Comprise the steps：1) key of electronic organ is equally divided into some packets, every group pair
Answer a packet circuit；2) touching signal is detected whether by the single-chip microcomputer；3) by the monolithic machine examination
Survey the affiliated packet that touching signal occurs；4) corresponding key is opened by the multiplexer channel controlling switch of respective packets to lead to
Road, detection produces the key of touching signal；5) monolithic is sent into after the signal processing circuit 4 is by touching signal transacting
Machine；6) calculating of the frequency and amplitude of touching signal is carried out by the single-chip microcomputer.
5. the touching signal band-wise processing method of piezo-electric electret fexible film electronic organ is used for as claimed in claim 4,
It is characterized in that：Step 2) in, the touching signal in every group of key produces corresponding external interrupt signal when occurring, by described
External interrupt signal described in monolithic machine testing determines whether that touching signal occurs.
6. the touching signal band-wise processing method of piezo-electric electret fexible film electronic organ is used for as claimed in claim 4,
It is characterized in that：Step 3) in, the single-chip microcomputer determines the packet that touching signal occurs by external interrupt signal, and in step
It is rapid 4) in key scanning is carried out by the multiplexer channel controlling switch of the packet, with detect produce touching signal key.
7. the touching signal band-wise processing method of piezo-electric electret fexible film electronic organ is used for as claimed in claim 4,
It is characterized in that：Step 6) in, single-chip microcomputer calculate when be provided with for exclude low-voltage fluctuation produced by interference exempt from interference
Voltage threshold (Vth), when detect touching signal voltage exceed it is described exempt from interference voltage threshold value (Vth) when, then when writing down first
Between (t1)；When signal voltage rises, and it is re-lowered to described when exempting from interference voltage threshold value (Vth), then write down for the second time
(t2) frequency of touching signal, is calculated by the time difference of time twice, and according to touching signal peak crest voltage (V0),
Draw the amplitude of touching signal.
8. the touching signal band-wise processing side for piezo-electric electret fexible film electronic organ as described in claim 4 or 7
Method, it is characterised in that：Step 6) in, the output of the FREQUENCY CONTROL qin sound tone of the touching signal, qin sound tone is with described
The quickening of frequency and increase；The amplitude of the touching signal controls the output of qin sound volume, and qin sound volume increases with the amplitude
It is high and increase；The change and the change joint effect qin change of tune of the volume of the qin sound tone.
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| CN201710114143.9A CN106683653B (en) | 2017-02-28 | 2017-02-28 | Touch key signal multi-channel processing circuit and method for piezoelectric electret flexible film electronic organ |
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| CN201710114143.9A CN106683653B (en) | 2017-02-28 | 2017-02-28 | Touch key signal multi-channel processing circuit and method for piezoelectric electret flexible film electronic organ |
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| CN106683653B CN106683653B (en) | 2020-11-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108492805A (en) * | 2018-04-24 | 2018-09-04 | 凯涛电子（上海）有限公司 | Multi-mode portable electronics audio device and system |
| CN109429138A (en) * | 2017-08-22 | 2019-03-05 | 上海汽车集团股份有限公司 | A kind of method, apparatus and system for realizing interior sound control |
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| CN106683653B (en) | 2020-11-10 |
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