CN107358970A - A kind of music generating method and its system of low cost monolithic machine - Google Patents
A kind of music generating method and its system of low cost monolithic machine Download PDFInfo
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- CN107358970A CN107358970A CN201710341231.2A CN201710341231A CN107358970A CN 107358970 A CN107358970 A CN 107358970A CN 201710341231 A CN201710341231 A CN 201710341231A CN 107358970 A CN107358970 A CN 107358970A
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
- G11B27/031—Electronic editing of digitised analogue information signals, e.g. audio or video signals
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Abstract
The invention discloses a kind of music generating method of low cost monolithic machine, comprise the following steps：S1. the note in music score, beat represent frequency and temporal information, note, beat in music score, frequency meter corresponding to generation and delay data table；S2. according to frequency meter and delay data table, single-chip microcomputer is allowed to generate the discrete data sequences of corresponding frequencies periodic signal using CORDIC fast algorithms, and Delay determines the quantity of the discrete data of each frequency；S3. the discrete data of generation, as audio CODEC sampled data, audio CODEC is inputed to, audio CODEC drives loudspeaker to release music again.Corresponding note frequencies are generated sine wave by the present invention using CORDIC fast algorithms, and the sine wave of different frequency is combined composition music by the length of time delay.Audio CODEC described in the present invention is to refer to complete voice, audio signal AD/DA conversions and A rates, the chip of μ rates coding, and the present invention only needs to use audio CODEC AD/DA translation functions.
Description
Technical field
The present invention relates to music generation technique field, in particular it relates to a kind of music generating method of low cost monolithic machine
And its generation system.
Background technology
The real music of the electronic equipment of such as wireless pager, wireless doorbell etc, typically using lower cost solution,
The hardware used is simple, the CPU speeds of service, limited storage space, and the audio for being not suitable for also running such as MP3 standards is soft
Part.The music of this class of electronic devices is typically stored in local with certain forms, supply and demand will when play.Mainly there are two schemes
Realize：1. as shown in figure 1, special Music Clip realizes that is, music data is stored in Music Clip, straight by Music Clip
Connect driving loudspeaker and play music；2. as shown in Fig. 2 SCM PWM realize, music data (namely the frequency meter of music score and when
Prolong table) it is stored in SCM system, single-chip I/O mouth output pwm signal, loudspeaker are driven by audio frequency power amplifier, pwm signal
It is fixed that the parameter such as duration and dutycycle is decided by vote by frequency meter and time delay.In both schemes, although the first scheme realizes letter
It is single, but hardware cost and complexity, increase power consumption can be improved；Two schemes are all more commonly used.But both schemes have individual be total to
The shortcomings that same：Music can only be realized, if also need to play the signals such as voice, both hardware plans all can not be real
It is existing.Voice is played, it is necessary to hardware architecture as shown in Figure 3.If take this mode to play music, it is necessary to similar MP3 it
The audio decoder of class, higher is required to CPU operational capability, while need very big memory space storage music number
It is improper inexpensive embedded to set according to, this to require that only suitable cost is high, the embedded device that power consumption is big, operational capability is strong
It is standby.
The content of the invention
It is an object of the invention to solve the problems, such as the music of Fig. 3 hardware.
To achieve the above object, a kind of music generating method suitable for low cost monolithic machine of present invention offer, including with
Lower step：
S1. the note in music score, beat represent frequency and temporal information, note, beat in music score, and generation is corresponding
Frequency meter and delay data table；
S2. according to frequency meter and delay data table, single-chip microcomputer is allowed to utilize the CORDIC fast algorithms generation corresponding frequencies cycle
The discrete data sequences of signal, and Delay determines the quantity of the discrete data of each frequency；
S3. the discrete data of generation, as audio CODEC sampled data, audio CODEC, audio CODEC are inputed to
Loudspeaker are driven to play music again.
Here, the audio CODEC is to refer to complete voice, audio signal AD/DA conversions and A rates, the core of μ rates coding
Piece, the present invention only need to use audio CODEC AD/DA translation functions.
Preferably, the CORDIC fast algorithms, specifically include following steps：
S31. anglec of rotation θ is represented with radian because any angle trigonometric function solve can be transformed into (- pi/2,
Pi/2) solve in the range of this, here, θ scope be limited to (- pi/2, pi/2), it is necessary to the maximum angle solved be pi/2=
1.57075；
S32. as shown in figure 4, on plane right-angle coordinate, by point (x1,y1) along origin of coordinates rotate counterclockwise θ angles
To point (x2,y2), its algebraic expression, i.e. spin equation are：
x2=x1cosθ-y1sinθ
y2=x1sinθ+y1cosθ
Factor cos θ are proposed, spin equation is changed into：
x2=x1cosθ-y1Sin θ=cos θ (x1-y1tanθ)
y2=x1sinθ+y1Cos θ=cos θ (y1-x1tanθ)
S33. remove cos θ items, obtain pseudo- spin equation：
So, x and y value increases 1/cos θ times respectively, because cos θ are less than or equal to 1, so vectorialModulus value become it is big by 1/
Cos θ times, as shown in Figure 5；
S34. each anglec of rotation θ is controllediValue, allow tan θi=2-i, the coordinate of the pseudo- rotation of ith is：
di=+/- 1
Here, rotate counterclockwise di=+1, turn clockwise di=-1；
S35. due to cos θ in rotating every timeiIt is ignored, after n rotation,WithIt is exaggerated KnTimes, precalculate
Go out the accessory substance i.e. contraction-expansion factor K of n pseudo- rotationnValue：
Similar, touch-tone signal can be regarded as special music, this special music does not have rhythm, it is only necessary to
Frequency information includes two kinds of frequencies simultaneously with regard to enough, it is only necessary to while the signal of two kinds of frequencies is generated, directly addition is
Can.Preferably, the signal of the generation is touch-tone signal DTMF.
Here, iterations is adjustable, and due to for playing music, and does not need audio CODEC outputs tight
The sine wave signal of lattice.According to experimental verification, dropped to 6 times when iterations, tonequality is substantially unaffected.
For the present invention is better described, here, a kind of music generation system of low cost monolithic machine, including monolithic are also provided
Machine, audio CODEC, loudspeaker, the audio CODEC are connected with single-chip microcomputer, loudspeaker respectively, the single-chip microcomputer be built-in with including
The program of CORDIC fast algorithms, the single-chip microcomputer are built-in with frequency meter corresponding to music score and delay data table.
Compared with prior art, the beneficial effects of the invention are as follows：Music generating method and its system, according to the frequency of music
Table and time delay table, data sequence is generated with cordic algorithm, make full use of cordic algorithm " only to be transported with addition, displacement, logic
Calculate, small without multiplication and division, computing overhead " the characteristics of, smooth it can also be run in the SCM system of low cost.To reduce cost and
Power consumption is significant.
Brief description of the drawings
Fig. 1 is a kind of structure principle chart of prior art；
Fig. 2 is the structure principle chart of another prior art；
Fig. 3 is the structure principle chart of the embodiment of the present invention one；
Fig. 4 be the embodiment of the present invention one on plane right-angle coordinate by point (x1, y1) along origin of coordinates rotate counterclockwise θ
Angle is to point (x2, y2) coordinate diagram；
Fig. 5 is the pseudo- rotation schematic diagram of the embodiment of the present invention one；
Fig. 6 is the embodiment of the present invention throughout one's life into music signal flow chart；
Fig. 7 is the flow chart that the embodiment of the present invention two generates touch-tone signal DTMF.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
A kind of music generating method suitable for low cost monolithic machine, comprise the following steps：
S1. the note in music score, beat represent frequency and temporal information, note, beat in music score, and generation is corresponding
Frequency meter and delay data table；
S2. according to frequency meter and delay data table, single-chip microcomputer is allowed to utilize the CORDIC fast algorithms generation corresponding frequencies cycle
The discrete data sequences of signal, and Delay determines the quantity of the discrete data of each frequency；
S3. the discrete data of generation, as audio CODEC sampled data, audio CODEC, audio CODEC are inputed to
Loudspeaker are driven to release music again.
In the S2 steps, corresponding note frequencies are generated into sine wave, different frequencies using the CORDIC fast algorithms
The sine wave of rate is combined composition music by the length of time delay.
The CORDIC fast algorithms, specifically include following steps：
S31. anglec of rotation θ is represented with radian because any angle trigonometric function solve can be transformed into (- pi/2,
Pi/2) solve in the range of this, here, θ scope be limited to (- pi/2, pi/2), it is necessary to the maximum angle solved be pi/2=
1.57075；
S32. shown in reference picture 4, on plane right-angle coordinate, by point (x1, y1) along origin of coordinates rotate counterclockwise θ angles
Spend point (x2, y2), its algebraic expression, i.e. spin equation are：
x2=x1cosθ-y1sinθ
y2=x1sinθ+y1cosθ
Factor cos θ are proposed, spin equation is changed into：
x2=x1cosθ-y1Sin θ=cos θ (x1-y1tanθ)
y2=x1sinθ+y1Cos θ=cos θ (y1-x1tanθ)
S33. remove cos θ items, obtain pseudo- spin equation：
Shown in reference picture 5, the angle of puppet rotation is correct, but x and y value increases 1/cos θ times respectively, due to cos θ
Less than or equal to 1, so vectorialModulus value become big 1/cos θ times；
S34. each anglec of rotation θ is controllediValue, allow tan θi=2-i, the coordinate of the pseudo- rotation of ith is：
di=+/- 1
Here, rotate counterclockwise di=+1, turn clockwise di=-1；
S35. due to cos θ in rotating every timeiIt is ignored, after n rotation,WithIt is exaggerated KnAgain, it is necessary in advance
Calculate the accessory substance i.e. contraction-expansion factor K of pseudo- rotationnValue：
The detailed process that the CORDIC fast algorithms are iterated is：
First time iteration：45 ° of rotation；Second of iteration：26.6 ° etc. of rotation, but the direction rotated every time may not
Equally, otherwise counterclockwise, or clockwise, principle is exactly less and less with the angle of object vector.Anglec of rotation θ and correspondence are just
Cut value tan θ and cosine value cos θ are as shown in table 1 below：
| i | tanθ | cosθ | θ (radian) |
| 0 | 1/20 | 0.707106781 | 0.78539816339 |
| 1 | 1/21 | 0.894427191 | 0.46364760900 |
| 2 | 1/22 | 0.9701425 | 0.24497866312 |
| 3 | 1/23 | 0.992277877 | 0.12435499454 |
| 4 | 1/24 | 0.998052578 | 0.06241880999 |
| 5 | 1/25 | 0.999512076 | 0.03123983342 |
| 6 | 1/26 | 0.999877952 | 0.01562372862 |
| 7 | 1/27 | 0.999969484 | 0.00781234106 |
| 8 | 1/28 | 0.999992371 | 0.00390623013 |
| 9 | 1/29 | 0.999998093 | 0.00195312251 |
Table 1
Assuming that there is initial vectorAnd object vector WithAngle be z °, it is assumed that z ° is
Counterclockwise,By n pseudo- rotation, make postrotational vectorWithFolder
Angle infinitely approaches 0,Algebraic expression can be written as：
xn=Kn(x0cosz0–y0sinz0)
yn=Kn(y0cosz0+x0sinz0)
If make x0=1/Kn, y0=0, then it can obtain sinz0And cosz0Value, sinz0≈yn, cosz0≈xn。
Assuming that z °=30 °, it is the suitable pseudo- number of revolutions of 8BIT, 16BIT or 32BIT selection according to CPU, that is, change
Generation number, iterations is higher, and precision is higher, and it is 10 times to select iterations here, Kn=1.64675921097, calculate
sinz0And cosz0Value it is as shown in table 2 below, yiCorresponding sinz0Value, xiCorresponding cosz0Value.Thus table is understood, the 10th time repeatedly
Result ratio of precision after generation is higher.
| i | di | θi | zi | yi | xi |
| 0 | +1 | 45 | +30 | 0 | 0.6073 |
| 1 | -1 | 26.6 | -15 | 0.6073 | 0.6073 |
| 2 | +1 | 14 | +11.6 | 0.3036 | 0.9109 |
| 3 | -1 | 7.1 | -2.4 | 0.5313 | 0.8350 |
| 4 | +1 | 3.6 | +4.7 | 0.4270 | 0.9014 |
| 5 | +1 | 1.8 | +1.1 | 0.4833 | 0.8747 |
| 6 | -1 | 0.9 | -0.7 | 0.5106 | 0.8596 |
| 7 | +1 | 0.4 | +0.2 | 0.4972 | 0.8676 |
| 8 | -1 | 0.2 | -0.2 | 0.5040 | 0.8637 |
| 9 | +1 | 0.1 | +0 | 0.5006 | 0.8657 |
Table 2
Cordic algorithm is told about below asks realization of the sine value in fixed-point CPU.
Iterations is determined first, then determines two kinds of initial values,
1.x0Initial value 1/Kn；
2. anglec of rotation θ constant value table, radian represents, altogether ten values, as table 1 the 4th arranges, by rotation
The order turned, that is, descending order arrangement, first is 45 ° of radian value.
Here, all data are all decimals, so data are represented with scalar number i.e. Q forms.Agreement asks sinusoidal
Function is short cordicsine (short theta), and theta is the angle value of input.In order to save memory space, we
Arrange a minimal time delay unit minibeat, the time delay of each frequency i.e. note is minibeat integer on music score
Times, actually frequency also can be operated so.
Difference just can be generated using different input angle step-length step, short cordicsine (short theta)
The sine wave of frequency.Step-length step is exactly each increments of theta, by sample frequency samplerate and needs the frequency generated
Freq determines that calculation formula is as follows：
Step=2 π/(samplerate/freq)
The whole flow process figure for generating music is as shown in Figure 6.
Shown in reference picture 3, here, a kind of sound generating system of low cost monolithic machine, including single-chip microcomputer, audio are also provided
CODEC, loudspeaker, the audio CODEC are connected with single-chip microcomputer, loudspeaker respectively, and the single-chip microcomputer is built-in with quick including CORDIC
The program of algorithm, the single-chip microcomputer are built-in with the frequency meter and delay data table of music score.
Embodiment two：
Shown in reference picture 7, except generating music signal, the present embodiment is applied to generation touch-tone signal DTMF, can be with
Touch-tone signal is regarded as special music, this special music does not have rhythm, it is only necessary to frequency information with regard to enough, and
Include two kinds of frequencies simultaneously, it is only necessary to while the signal of two kinds of frequencies is generated, directly it is added.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of changes, modification can be carried out to these embodiments, replace without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (5)
1. a kind of music generating method suitable for low cost monolithic machine, it is characterised in that comprise the following steps：
S1. the note in music score, beat represent frequency and temporal information, note, beat in music score, generate corresponding frequency
Rate table and delay data table；
S2. according to frequency meter and delay data table, single-chip microcomputer is allowed to utilize CORDIC fast algorithms generation corresponding frequencies periodic signal
Discrete data sequences, and Delay determines the quantity of the discrete data of each frequency；
S3. the discrete data of generation, as audio CODEC sampled data, audio CODEC is inputed to, driving loudspeaker play.
2. the music generating method according to claim 1 suitable for low cost monolithic machine, it is characterised in that the S2 steps
In rapid, using the CORDIC fast algorithms by n times iteration, here, N can be done suitably according to the operational capabilities of CPU in itself
Adjustment, N is smaller, and operand is also smaller, but precision is lower, corresponding note frequencies is generated into sine wave, different frequency is just
String ripple is combined composition music by the length of time delay.
3. the music generating method according to claim 2 suitable for low cost monolithic machine, it is characterised in that described
CORDIC fast algorithms specifically include following steps：
S31. anglec of rotation θ is represented with radian, can be transformed into (- pi/2, pi/2) because any angle trigonometric function solves
Solved in the range of this, here, θ scope is limited to (- pi/2, pi/2), it is necessary to which the maximum angle solved is pi/2=1.57075；
S32. on plane right-angle coordinate, by point (x1,y1) along origin of coordinates rotate counterclockwise θ angles to point (x2,y2), its generation
Number expression formula, i.e. spin equation are：
x2=x1cosθ-y1sinθ
y2=x1sinθ+y1cosθ
Factor cos θ are proposed, spin equation is changed into：
x2=x1cosθ-y1Sin θ=cos θ (x1-y1tanθ)
y2=x1sinθ+y1Cos θ=cos θ (y1-x1tanθ)
S33. remove cos θ items, obtain pseudo- spin equation：
So, x and y value increases 1/cos θ times respectively, because cos θ are less than or equal to 1, so vectorialModulus value become big 1/cos θ
Times；
S34. each anglec of rotation θ is controllediValue, allow tan θi=2-i, the coordinate of the pseudo- rotation of ith is：
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The accessory substance of rotation is contraction-expansion factor KnValue：
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4. the music generating method according to claim 3 suitable for low cost monolithic machine, it is characterised in that the generation
Signal be music or touch-tone signal DTMF.
5. the music generation system of a kind of low cost monolithic machine, it is characterised in that including single-chip microcomputer, audio CODEC, loudspeaker, institute
State audio CODEC to be connected with single-chip microcomputer, loudspeaker respectively, the single-chip microcomputer is built-in with the program for including CORDIC fast algorithms, institute
State single-chip microcomputer and be built-in with frequency meter corresponding to music score and delay data table.
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| CN111627411A (en) * | 2020-06-16 | 2020-09-04 | 深圳市陶顿电子有限公司 | Electronic musical instrument based on electronic gyroscope and electronic accelerometer |
| CN112202462A (en) * | 2020-10-15 | 2021-01-08 | Oppo广东移动通信有限公司 | Time delay compensation method and device, electronic equipment and storage medium |
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Application publication date: 20171117 |