CN101799317B - Measuring method of technical parameters of delay-type audio devices of electrophone - Google Patents
Measuring method of technical parameters of delay-type audio devices of electrophone Download PDFInfo
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- CN101799317B CN101799317B CN2009102734526A CN200910273452A CN101799317B CN 101799317 B CN101799317 B CN 101799317B CN 2009102734526 A CN2009102734526 A CN 2009102734526A CN 200910273452 A CN200910273452 A CN 200910273452A CN 101799317 B CN101799317 B CN 101799317B
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Abstract
The invention provides a measuring method of technical parameters of delay-type audio devices of an electrophone. In the method, the characteristics of a digital oscilloscope are utilized to measure parameters of total delay generated by various types of low-frequency wave audio devices generated by utilizing an actuating signal source and the waves generated by the actuating signal source, and to determine the technical parameters of scanning depth, scanning speed and the like. The invention can be used for objectively measuring the values of the technical parameters, breaks through methods which only can carry out subjective judgment in the field, provides a corresponding standard and has simple operation, rapidness and accuracy.
Description
Technical field
The present invention relates to the measuring method of technical parameters of delay-type audio devices of electrophone.
Background technology
Chorus in the time-delay class audio device and fringing audio are to utilize a LF oscillator (LFO) to produce low frequency waves such as sine wave, triangular wave, sawtooth wave to modulate the set time delay that is commonly referred to as initial delay (Initial Delay) that is determined by constant, make total time delay (Total Delay) under the fluctuation amplitude of modulating wave, between maximal value and minimum value, fluctuate, the scope of fluctuation is called scan depths, and the speed of the various ripples that LF oscillator (LFO) produces is called sweep speed.Scan depths and sweep speed are the technical parameter of time-delay class audio device, can determine the good and bad degree of audio device by technical parameter, and the subjective judgement method that the good and bad main musician of leaning on who judges audio device at present listens with ear, and do not have quantitative method of testing, not accurate enough.
Summary of the invention
The technical problem to be solved in the present invention is: a kind of measuring method of technical parameters of delay-type audio devices of electrophone is provided, can measures the numerical value of technical parameter quantitatively.
The present invention solves the problems of the technologies described above the technical scheme of being taked to be: the measuring method of technical parameters of delay-type audio devices of electrophone is characterized in that: it may further comprise the steps:
1) the FEEDBACK CONTROL amount of tested audio device is turned off or transferred to minimum value, other controlled quentity controlled variable transfers to ratings;
2) exciting signal source of peripheral hardware, exciting signal source output single frequency is F, the time interval to be the sinusoidal wave column signal that T, electromotive force satisfy tested audio device input signal ratings, link with the input end of tested audio device, encourage tested audio device, wherein T
d＜T＜2T
d, T
dMaximum delay time for tested audio device;
3) after the correction of oscillograph elapsed time scale and voltage scale, the output terminal of exciting signal source and the output terminal of tested audio device link with oscillographic two input ends respectively, the waveform of the output signal of observation exciting signal source and the output signal of tested audio device, measure the interval of two mark waveforms with oscillographic time ruler, the time interval between x axle shows signal in the measurement result, level difference between y axle shows signal;
4) numerical value of the accurate measuring technique parameter of the oscillographic surveyors' staff of application.
Press such scheme, described frequency F chooses in tested audio device frequency response range as required.
Press such scheme, described exciting signal source is a kind of in LF oscillator, signal generator or the various signal generation software.
Press such scheme, oscillographic CH1 input end is imported the output signal of tested audio device, the output signal in CH2 input end input signal source; Oscillographic triggering mode is adjusted into the CH2 input end and triggers.
Press such scheme, measure inhibit signal respectively with oscillographic time ruler and arrive apart from the interval (T2) of the signal output waveform of the interval (T1) of the signal output waveform closest approach of exciting signal source and the signal output waveform of exciting signal source and inhibit signal waveform arrival solstics and exciting signal source, interval (T1) the gained time that the interval (T2) of the measure output signal that reaches solstics and exciting signal source is deducted the output signal of closest approach and exciting signal source is the scan depths of tested audio device.
Press such scheme, measure the hunting period of inhibit signal, the inverse of hunting period is the sweep speed of tested audio device.
Press such scheme, measure time delayed signal n used time in cycle of swing with the method for timer artificial counting, with institute's survey time divided by n, obtain the hunting period of inhibit signal, repeatedly measurement is averaged.
Principle of work of the present invention is: the characteristic of utilizing digital oscilloscope, various types of low frequency wave modulation audio devices that measurement utilizes exciting signal source to produce, parameter between the ripple that generation total delay time and exciting signal source produce is determined technical parameters such as scan depths and sweep speed.
Beneficial effect of the present invention is: the numerical value of 1, measuring technical parameter objectively; 2, broken through the method that this field can only subjective judgement, respective standard is provided; 3, simple to operate, quick and precisely.
Description of drawings
Fig. 1 is chorus and flange basic model
Fig. 2 is the relation between the ripple that produces of total delay time and LF oscillator
Fig. 3 is that the measuring method of scan depths shows
Fig. 4 is that the device of the embodiment of the invention connects figure
Embodiment
Fig. 1 is chorus and flange basic model, chorus and fringing are to utilize a LF oscillator (LFO) to produce low frequency waves such as sine wave, triangular wave, sawtooth wave to modulate the set time delay that is commonly referred to as initial delay (Initial Delay) that is determined by constant, make total time delay (Total Delay) under the fluctuation amplitude of modulating wave, between maximal value and minimum value, fluctuate, the scope of fluctuation is called scan depths, the speed of the various ripples that LF oscillator (LFO) produces is called sweep speed, as shown in Figure 2.
Fig. 4 is that the device of the embodiment of the invention connects figure, during measurement the FEEDBACK CONTROL amount of tested audio device turned off or transfer to minimum value, other controlled quentity controlled variable transfers to ratings, it should be closed if any temporary transient other accident effect, exciting signal source of peripheral hardware, the output single frequency is that F, the time interval are the sinusoidal wave column signal that T, electromotive force satisfy tested audio device input signal ratings, encourages tested audio device, wherein T
d＜T＜2T
d, T
dMaximum delay time for tested audio device, the output end signal of tested audio device is added to oscillographic CH1 and CH2 input end respectively by the output signal that connects behind the nominal load with exciting signal source, oscillographic triggering mode is adjusted into CH2 input end (the output signal input end that promptly connects exciting signal source) and triggers, with the gear of x axial adjustment to the suitable benefit of observation, after connecting tested audio device power supply, in that we can be observed inhibit signal and swing on the x axle on the oscillograph, as shown in Figure 3.
Wherein exciting signal source can be LF oscillator, signal generator or various signal generation softwares etc. for sending any programmed signal source of required waveform.
Measure scan depths: measure the inhibit signal waveform respectively with the time scale and arrive, survey time T 2 is deducted the scan depths that the T1 gained time is tested audio device apart from the interval (T2 shown in Figure 3) of the signal output waveform of the interval (T1 shown in Figure 3) of the signal output waveform of the signal output waveform closest approach of exciting signal source and exciting signal source and arrival solstics waveform and exciting signal source.
Measure sweep speed: according to the measuring method of scan depths, measure inhibit signal hunting period, the method of available timer artificial counting is measured n used time t of cycle of time delayed signal swing, with institute's survey time divided by n, i.e. (t/n) obtains the hunting period of inhibit signal, the inverse in this cycle is sweep speed, for the accuracy that guarantees to measure, repeatedly duplicate measurements, and when single is counted suitable n cycle of many meters.
Get the multi-functional effect device of model EMF-3 and measure as tested audio device, its frequency response range is 20Hz-20kHz, and requiring scan depths is 5ms, the sweep speed setting range be 0.032Hz to 4.5Hz, initial time delay is 3ms.According to mode current in the electric crying musical instrument industry: when frequency input signal is not had specific requirement, incoming frequency is 1kHz, therefore when measuring with F=0.001s (1/1000Hz), T=2* interval time (5+3) ms=16ms, the wave train signal of bursting inputs to tested device, with the output signal of oscillographic CH2 input end input signal source, oscillographic CH1 input end is imported tested audio device output signal, and oscillographic triggering mode is adjusted into the CH2 input end and triggers.
Measuring the inhibit signal waveform with the time scale arrived apart from the time interval of the signal output waveform closest approach of exciting signal source, this time interval T1 is 3ms, measuring the inhibit signal waveform with the time scale, to arrive apart from the time interval T2 in the signal output waveform solstics of exciting signal source be 8ms, the scan depths that T2-T1 can be obtained tested audio device is 5ms, meets the demands.
Sweep speed control turned round transfer to minimum bit, in the time of t=60s, writing down tested audio device signal output waveform is 1.8 times by the signal output waveform solstics frequency n from the signal output waveform closest approach of distance exciting signal source to the distance exciting signal source, (t/n) can get with formula, the minimum sweep speed of tested audio device is 0.03Hz, in like manner, sweep speed control turned round transfer to dominant bit, in the time of t=60s, writing down tested audio device signal output waveform is 276 times by the signal output waveform solstics frequency n from the signal output waveform closest approach of distance exciting signal source to the distance exciting signal source, (t/n) can get with formula, the maximum scan speed of tested audio device is 4.6Hz, meets the demands.
Claims (7)
1. the measuring method of technical parameters of delay-type audio devices of electrophone, it is characterized in that: it may further comprise the steps:
1) the FEEDBACK CONTROL amount of tested audio device is turned off or transferred to minimum value, other controlled quentity controlled variable transfers to ratings;
2) exciting signal source of peripheral hardware, exciting signal source output single frequency is F, the time interval to be the sinusoidal wave column signal that T, electromotive force satisfy tested audio device input signal ratings, link with the input end of tested audio device, encourage tested audio device, wherein T
d＜T＜2T
d, T
dMaximum delay time for tested audio device;
3) after the correction of oscillograph elapsed time scale and voltage scale, the output terminal of exciting signal source and the output terminal of tested audio device link with oscillographic two input ends respectively, the waveform of the output signal of observation exciting signal source and the output signal of tested audio device, measure the interval of two mark waveforms with oscillographic time ruler, the time interval between x axle shows signal in the measurement result, level difference between y axle shows signal;
4) numerical value of the accurate measuring technique parameter of the oscillographic surveyors' staff of application.
2. the measuring method of technical parameters of delay-type audio devices of electrophone according to claim 1, it is characterized in that: described frequency F chooses in tested audio device frequency response range as required.
3. the measuring method of technical parameters of delay-type audio devices of electrophone according to claim 1 is characterized in that: described exciting signal source is a kind of in signal generator or the various signal generation software.
4. according to the measuring method of claim 1 or 2 or 3 described technical parameters of delay-type audio devices of electrophone, it is characterized in that: oscillographic CH1 input end is imported the output signal of tested audio device, the output signal in CH2 input end input signal source; Oscillographic triggering mode is adjusted into the CH2 input end and triggers.
5. the measuring method of technical parameters of delay-type audio devices of electrophone according to claim 4; It is characterized in that: with oscillographic time ruler respectively the transfer delay signal arrive apart from the interval (T2) of the signal output waveform of the interval (T1) of the signal output waveform closest approach of exciting signal source and the signal output waveform of exciting signal source and inhibit signal waveform arrival solstics and exciting signal source, interval (T1) the gained time that the interval (T2) of the measure output signal that reaches solstics and exciting signal source is deducted the output signal of closest approach and exciting signal source is the scan depths of tested audio device.
6. the measuring method of technical parameters of delay-type audio devices of electrophone according to claim 4 is characterized in that: measure the hunting period of inhibit signal, the inverse of hunting period is the sweep speed of tested audio device.
7. the measuring method of technical parameters of delay-type audio devices of electrophone according to claim 6, it is characterized in that: measure time delayed signal n used time in cycle of swing with the method for timer artificial counting, with institute's survey time divided by n, obtain the hunting period of inhibit signal, repeatedly measure and average.
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| CN108074555B (en) * | 2016-11-18 | 2021-05-14 | 北京酷我科技有限公司 | Evaluation method and system for piano playing |
| CN110113231B (en) * | 2019-04-30 | 2022-10-14 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Method for testing burst communication low detection probability performance |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2847246Y (en) * | 2005-10-28 | 2006-12-13 | 中国海洋大学 | Muscial instrument audio frequency characteristic resonance meter |
| CN101415141A (en) * | 2008-11-21 | 2009-04-22 | 瑞声声学科技(常州)有限公司 | System and method for measuring microphone response time |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2847246Y (en) * | 2005-10-28 | 2006-12-13 | 中国海洋大学 | Muscial instrument audio frequency characteristic resonance meter |
| CN101415141A (en) * | 2008-11-21 | 2009-04-22 | 瑞声声学科技(常州)有限公司 | System and method for measuring microphone response time |
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