CN102387235A - Method for using single chip computer to generate DTMF (Dual Tone Multiple Frequency) press key prompt tone - Google Patents
Method for using single chip computer to generate DTMF (Dual Tone Multiple Frequency) press key prompt tone Download PDFInfo
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- CN102387235A CN102387235A CN2011103104757A CN201110310475A CN102387235A CN 102387235 A CN102387235 A CN 102387235A CN 2011103104757 A CN2011103104757 A CN 2011103104757A CN 201110310475 A CN201110310475 A CN 201110310475A CN 102387235 A CN102387235 A CN 102387235A
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Abstract
The invention provides a method for using a single chip computer to generate a DTMF (Dual Tone Multiple Frequency) press key prompt tone. The method comprises the following steps of: respectively determining a high-frequency frequency fh and a low-frequency frequency f1 according to needed DTMF signals and establishing an array A and an array B; determining the element numbers and element values of the array A and the array B and distributing two groups of the element values according to a sine law; when detecting that a press key is triggered, starting an interrupter in the single chip computer; circulating and overlapping two groups of elements of the array A and the array B in a pre-set overlapping time, generating a PWM (Pulse-Width Modulation) signal by using an overlapping result and outputting the PWM signal; transmitting the output PWM signal to a driver after the PWM signal passes through an analogue filter, namely driving sound producing equipment to obtain the needed DTMF press key prompt tone; and after the sound of the DTMF press key prompt tone is produced, closing the interrupter in the single chip computer. The method provided by the invention is simple and practical; and by utilizing the method provided by the invention, the system which needs to generate the DTMF press key prompt tone is easy to realize miniaturization and the cost is saved at the same time.
Description
Technical field
The present invention relates to DTMF key prompting voice technical field, particularly relate to a kind of method of using single-chip microcomputer to produce the DTMF key prompting voice.
Background technology
Dual tone multi-frequency dtmf (Dual Tone Multi Frequency) is a kind ofly to come numeral method in voice channel with tone, and it can be used at the analog voice channel command transmitting, therefore in communication, is widely used.Dual tone multi-frequency dtmf (Dual Tone Multi Frequency) is made up of high frequency group and low frequency group, and the height frequency group respectively comprises 4 frequencies, shown in table one:
Table one
A composite signal is formed in a high-frequency signal and a low frequency signal stack, represents a numeral, for example the low-frequency band of 770Hz and the high frequency band combination of 1336Hz is represented numeral 5.Therefore, the numeral of each telephone number has the unique low-frequency band and the combination of high frequency band, thereby forms dtmf signal.
In SCM system; Button is the input equipment that generally uses; Current DTMF key prompting voice be mostly through external speech chip or in advance the mode of stored sound data realize that except needs software was controlled, they all needed hardware resources such as extra speech chip or storage chip.
Summary of the invention
The shortcoming of prior art in view of the above; The object of the present invention is to provide a kind of method of using single-chip microcomputer to produce the DTMF key prompting voice, being used for solving prior art DTMF key prompting voice can only be through external speech chip or the problem that realizes of the mode of stored sound data in advance.
For realizing above-mentioned purpose and other relevant purposes, the present invention provides a kind of method of using single-chip microcomputer to produce the DTMF key prompting voice, and described method comprises:
(1) as required dtmf signal is confirmed high frequency frequency f h and low frequency frequency f l respectively;
(2) in SCM program, set up array A and array B, array A element number is for to round the result of sample rate divided by high frequency frequency f h, and array B element number is for to round the result of sample rate divided by low frequency frequency f l; The value of each element of array A is at one-period being the sampling point value in the sinusoidal waveform of 1/fh; The value of each element of array B is at one-period being the sampling point value in the sinusoidal waveform of 1/fl; Array A and array B are stored in the single-chip microcomputer internal storage;
(3) when having detected button and be triggered, start the interruption in the single-chip microcomputer, in the stack time of setting,, and utilize stack result generation pwm signal to export with the stack that circulates of two group elements of array A and array B;
(4) pwm signal with output flows to driver behind analog filter, can drive audible device and obtain required DTMF key prompting voice;
(5) pronunciation of DTMF key prompting voice finishes, and closes the interruption in the single-chip microcomputer.
Preferably, the concrete grammar of two group elements of said array A and array B circulation stack is:
Array A{a
1, a
2... a
k, a
K+1... a
m; Array B{b
1, b
2... b
m, b
M+1... b
n;
Each element of array A multiply by a stack coefficient c (wherein 0＜c＜1), obtains:
A
1{a
1*c，a
2*c，...a
k*c，a
k+1*c，...a
m*c}；
Each element of array B multiply by coefficient (1-c), obtains:
B
1{b
1*(1-c)，b
2*(1-c)，...b
m*(1-c)，b
m+1*(1-c)，...b
n*(1-c)}；
And then with the element of two arrays circulation stack;
With array A
1First element a
1* c and array B
1First element b
1* (1-c) stack, A
1Second element a
2* c and B
1Second element b
2* A is carried out in (1-c) stack successively
1Last element a
m* c and B
1M element b
m* (1-c) superposes, then A
1The 1st element a
1* c and B
1M+1 element b
M+1* (1-c) stack is carried out, up to A successively
1K element a
k* c and B
1Last element b
n* (1-c) superposes, afterwards A
1K+1 element a
K+1* c and B
1First element b
1* (1-c) stack goes on so successively, up to the stacking fold that reaches setting, and k＜m＜n wherein.
Preferably, the span of said array A and array B element is [0～2
n]; Span after described array A and the stack of array B element is [0～2
n], wherein, n is a positive integer.
Preferably,, said array A and array B are one-dimension array.
Preferably, stack total time of comprising array A and array B time of finishing of said DTMF key prompting voice pronunciation and stack are accomplished the back and are arrived impeding shutdown preceding free time.
Preferably, the stacking fold of said array A and array B is the single stack time of stack total time/array A and the array B of array A and array B.
Preferably, described sampling point value is sinusoidal rule distribution.
Preferably, the described sinusoidal wave y=2 that adopts
nThe function of sin (ω x), wherein, n is a positive integer.
As stated, a kind of method of using single-chip microcomputer to produce the DTMF key prompting voice of the present invention has following beneficial effect:
External speech chip or storage chip have been saved; Simplify the hardware circuit of SCM system, utilize the single-chip microcomputer own resources, adopt timer to interrupt; The mode that produces pwm signal that will superpose by two arrays that sine wave distributes generates the DTMF key prompting voice; Method of the present invention is simple and practical, makes the system that needs to produce the DTMF key prompting voice more be prone to realize miniaturization, provides cost savings simultaneously.
Description of drawings
Fig. 1 is shown as the inventive method flow chart.
Fig. 2 is shown as the Interrupt Process flow chart of the inventive method.
Fig. 3 is shown as pwm signal and converts required DTMF key prompting voice flow chart into.
The element numbers explanation:
S11-S15, the S141-S144 step
Embodiment
Below through specific instantiation execution mode of the present invention is described, those skilled in the art can understand other advantages of the present invention and effect easily by the content that this specification disclosed.The present invention can also implement or use through other different embodiment, and each item details in this specification also can be based on different viewpoints and application, carries out various modifications or change under the spirit of the present invention not deviating from.
See also Fig. 1 to Fig. 3.Need to prove; The diagram that is provided in the present embodiment is only explained basic conception of the present invention in a schematic way; Satisfy only show in graphic with the present invention in relevant assembly but not component count, shape and plotted when implementing according to reality; Kenel, quantity and the ratio of each assembly can be a kind of random change during its actual enforcement, and its assembly layout kenel also maybe be more complicated.
As shown in Figure 1, the present invention is a kind of method of using single-chip microcomputer to produce the DTMF key prompting voice, and described method comprises:
Step S11, dtmf signal is as required confirmed high frequency frequency f h and low frequency frequency f l respectively;
Because the only corresponding unique dtmf signal of numeral, and the corresponding high frequency frequency of each numeral is fixing with the low frequency frequency, so as long as contrast the frequency meter of dtmf signal, can confirm the concrete numerical value of high frequency frequency f h and low frequency frequency f l;
Step S12 sets up array A and array B in SCM program, and element number and the element value of definite array A and array B, is convenient stack, and array A and array B should be one-dimension array;
Confirm the element number of array A and array B: array A element number is for to round the result of sample rate divided by high frequency frequency f h, and array B element number is for to round the result of sample rate divided by low frequency frequency f l;
Confirm the element value of array A and array B: can adopt y=2
nSin (ω x) function according to the array A number value of in one-period is the sinusoidal waveform of 1/fh, sampling, is the tonequality that guarantees the DTMF key prompting voice, and the sampling point value of sampling value should be tried one's best evenly, and makes described sampling point value be sinusoidal rule distribution; Can adopt y=2
nSin (ω x) function; According to the element number of the array B value of in one-period is the sinusoidal waveform of 1/fl, sampling; For guaranteeing the tonequality of DTMF key prompting voice, the sampling point value of sampling value should be tried one's best evenly, and makes described sampling point value be sinusoidal rule distribution; The span of array A and array B element is [0～2
n]; And array A and array B be stored in the single-chip microcomputer internal storage;
Step S13 when having detected button and be triggered, starts the interruption in the single-chip microcomputer;
Step S14 opens after the interruption in the single-chip microcomputer, and response button is included in stack time of setting the stack that circulates of two group elements with array A and array B, and utilizes stack result generation pwm signal to export;
The concrete grammar of the two group elements circulation stack of said array A and array B is:
Array A{a
1, a
2... a
k, a
K+1... a
m; Array B{b
1, b
2... b
m, b
M+1... b
n;
Each element of array A multiply by a stack coefficient c (wherein 0＜c＜1), obtains:
A
1{a
1*c，a
2*c，...a
k*c，a
k+1*c，...a
m*c}；
Each element of array B multiply by coefficient (1-c), obtains:
B
1{b
1*(1-c)，b
2*(1-c)，...b
m*(1-c)，b
m+1*(1-c)，...b
n*(1-c)}；
And then with the element of two arrays circulation stack;
With array A
1First element a
1* c and array B
1First element b
1* (1-c) stack, A
1Second element a
2* c and B
1Second element b
2* A is carried out in (1-c) stack successively
1Last element a
m* c and B
1M element b
m* (1-c) superposes, then A
1The 1st element a
1* c and B
1M+1 element b
M+1* (1-c) stack is carried out, up to A successively
1K element a
k* c and B
1Last element b
n* (1-c) superposes, afterwards A
1K+1 element a
K+1* c and B
1First element b
1* (1-c) stack goes on so successively, up to the stacking fold that reaches setting, and k＜m＜n wherein.
The stacking fold of said array A and array B is the single stack time of the stack total time of array A and array B divided by array A and array B; The single stack time of stack total time and array A and array B should just preestablish according to the performance of single-chip microcomputer and the length of required DTMF key prompting voice;
The pwm signal of output is flowed to driver behind analog filter, can drive audible device and obtain required DTMF key prompting voice; The pronunciation of DTMF key prompting voice finishes, and closes the interruption in the single-chip microcomputer;
The stack total time that the time that the pronunciation of said DTMF key prompting voice finishes comprises array A and array B and stack are accomplished the back and are arrived impeding shutdown preceding free time, and this free time should preestablish.
In sum; A kind of method of using single-chip microcomputer to produce the DTMF key prompting voice provided by the invention; According to the characteristics of dtmf signal, inner at single-chip microcomputer, utilize and interrupt; Produce pwm signal through setting, thereby obtain required DTMF key prompting voice with the stack that circulates of corresponding two arrays that distribute by sine wave of dtmf signal frequency.
Embodiment:
The present invention produce to continue 120ms (total time that promptly superposes is 120ms) to use the MSP430F147 single-chip microcomputer, break off 50ms (i.e. stack accomplish the back to impeding shutdown preceding free time be 50ms), sampling precision is 8-bit, the value of n is 8; Sample rate is that the DTMF keypad tone of the key number " 5 " of 32k is an example, and concrete embodiment is described, supposes that the single stack time is 10us:
As shown in Figure 1:
Step S11 confirms high frequency frequency and low frequency frequency, can know according to dtmf signal, and the corresponding high frequency frequency f h of numeral " 5 " is 1336Hz, and low frequency frequency f l is 770Hz;
Step S12 sets up array A and array B in SCM program, array A element number is for to round the result of sample rate divided by high frequency frequency f h, and promptly the element number of array A is int (32kHz/1336Hz)=24; Array B element number is for to round the result of sample rate divided by low frequency frequency f l, and promptly the element number of array B is int (32kHz/770)=41.
Array A and array B are one-dimension array; The value of each element of array A is at one-period being the sampling point value in the sinusoidal waveform of 1/fh; The value of each element of array B is at one-period being the sampling point value in the sinusoidal waveform of 1/fl; The span that should guarantee array A and array B element is [0～2
8], the span after array A and the stack of array B element is [0～2
8]; And make that these two groups of integers all change by sinusoidal trend and the distribution in a sinusoidal period is tried one's best evenly, specifically can use y=2
8Sin (ω x) function produces the element value of array A and array B, and adjustment gets final product a little then:
The element of optional array A and array B is two following group elements:
A＝{0x04，0x0E，0x018，0x22，0x2C，0x38，0x40，0x4A，0x54，0x5E，0x68，0x72，0x7C，0x86，0x90，0x9A，0XA4，0xAE，0XB8，0XC2，0XD4，0XE0，0xEC，0XF8}；
B＝{0x02，0x08，0x0E，0x14，0x1A，0x20，0x26，0x2C，0x32，0x38，0x3E，0x44，0x4A，0x50，0x56，0x5C，0x62，0x68，0x6E，0x74，0x7A，0x80，0x8A，0x8E，0x94，0x9A，0xA0，0XA6，0xAE，0XB4，0xBA，0XC0，0XC6，0xCC，0XD2，0XdD8，0xDE，0XE4，0xEA，0XF0，0XF6}；
Each element of array A multiply by a stack coefficient c, and c is taken as 0.5, obtains:
A
1＝{0x02，0x07，0x0C，0x11，0x16，0x1B，0x20，0x25，0x2A，0x2F，0x34，0x39，0x3E，0x43，0x48，0x4D，0x52，0x57，0x5C，0x61，0x6A，0x70，0x76，0x7C}；
Each element of array B multiply by coefficient (1-c), obtains:
B
1＝{0x01，0x04，0x07，0x0A，0x0D，0x10，0x13，0x16，0x19，0x1C，0x1F，0x22，0x25，0x28，0x2B，0x2E，0x31，0x34，0x37，0x3A，0x3D，0x40，0x43，0x47，0x4A，0x4D，0x50，0x53，0x57，0x5A，0x5D，0x60，0x63，0x66，0x69，0x6C，0x6F，0x72，0x75，0x78，0x7B}；
Array A and array B are stored in the single-chip microcomputer internal storage;
Step S13, main program adopt the mode of inquiry to detect button, when having detected button and be triggered, start the interruption in the single-chip microcomputer, interrupt adopting the CCR0 of timer A to interrupt;
Step S14, after the opens interrupters, response button.The Interrupt Process flow process of response button is as shown in Figure 2;
Step S141, keypad tone then gets into step S15 if finish, and closes interruption, if keypad tone does not finish, gets into step S142, judges whether audible segment is accomplished;
Step S142 if audible segment is accomplished, gets into step S143, judges whether to reach the free time before the impeding shutdown, if audible segment is not accomplished, gets into step S144, carries out the stack of array A and array B;
Step S143 if reach the free time before the impeding shutdown, then gets into step S15, closes interruption, if reach the free time before the impeding shutdown, then returns;
Step S144; If audible segment is not accomplished; Stack circulated two group elements of array A and array B in the stack time of setting; And in the stack of in the CCR0 of timer A interruption, carrying out array A and array B; The number of times of stack is that the stack total time/array A of array A and array B and the single of array B superpose the time promptly 120ms/10us=12000 time;
The concrete grammar of the two group elements circulation stack of said array A and array B is:
With array A
1First element 0x02 and array B
1First element 0x01 stack, A
1Second element 0x07, and B
1Second element 0x04 stack, carry out A successively
1Last element 0x7C and B
1The 24th element 0x47 stack, A then
1The 1st element 0x02 and B
1The 25th element 0x4A stack, carry out successively, up to A
1The 17th element 0x52 and B
1Last element 0x7B stack, A afterwards
1The 18th element 0x57 and B
1First element 0x01 stack, go on so successively, up to the stack total time 120ms that reaches setting; After stack is accomplished, utilize the output unit of timer A that the pwm signal that stack result produces is exported;
Step S15, the pronunciation of DTMF key prompting voice finishes, and closes the interruption in the single-chip microcomputer, returns; The stack total time that the time that DTMF key prompting voice pronunciation finishes comprises array A and array B and stack are accomplished the back and are arrived impeding shutdown preceding free time; Promptly after stack was all accomplished, timer still can work on, but does not superpose; After stack is accomplished after time of 50ms; Just regard as once to pronounce to finish, process stack total time 120ms adds and arrives the preceding free time 50ms of impeding shutdown 170ms altogether after stack is accomplished that a DTMF key prompting voice pronunciation finishes.
As shown in Figure 3; The pwm signal of output can be produced the waveform by frequency f h and two kinds of sine-wave superimposed of fl behind analog filter; Promptly selected DTMF waveform signal; Can flow to driver after this signal process amplifier and power amplifier are handled, can drive audible device and obtain required DTMF key prompting voice.
In the additive process; Different stack result can produce the pwm signal of different frequency; The frequency of next pwm signal will be provided by in the interruption that responds behind previous PWM end cycle; The pwm signal crowd of these different frequencies can produce selected dtmf signal after through analog filter, and what this signal obtained through driving arrangement output is the DTMF key prompting voice of expectation.
In sum, a kind of method of using single-chip microcomputer to produce the DTMF key prompting voice provided by the invention is utilized the single-chip microcomputer own resources; In conjunction with the form of software, the mode that produces pwm signal that will superpose by two arrays that sine wave distributes produces the DTMF key prompting voice, need not external speech chip or storage chip; Simplify the hardware circuit of SCM system; Method of the present invention is simple and practical, makes the system that needs to produce the DTMF key prompting voice more be prone to realize miniaturization, provides cost savings simultaneously.So the present invention has effectively overcome various shortcoming of the prior art and the tool high industrial utilization.
The foregoing description is illustrative principle of the present invention and effect thereof only, but not is used to limit the present invention.Any be familiar with this technological personage all can be under spirit of the present invention and category, the foregoing description is modified or is changed.Therefore, have common knowledge the knowledgeable in the affiliated such as technical field, must contain by claim of the present invention not breaking away from all equivalence modifications of being accomplished under disclosed spirit and the technological thought or changing.
Claims (8)
1. method of using single-chip microcomputer to produce the DTMF key prompting voice is characterized in that described method comprises:
A) as required dtmf signal is confirmed high frequency frequency f h and low frequency frequency f l respectively;
B) in SCM program, set up array A and array B, array A element number is for to round the result of sample rate divided by high frequency frequency f h, and array B element number is for to round the result of sample rate divided by low frequency frequency f l; The value of each element of array A is at one-period being the sampling point value in the sinusoidal waveform of 1/fh; The value of each element of array B is at one-period being the sampling point value in the sinusoidal waveform of 1/fl; Array A and array B are stored in the single-chip microcomputer internal storage;
C) when having detected button and be triggered, start the interruption in the single-chip microcomputer, in the stack time of setting,, and utilize stack result generation pwm signal to export with the stack that circulates of two group elements of array A and array B;
D) pwm signal with output flows to driver behind analog filter, can drive audible device and obtain required DTMF key prompting voice;
E) pronunciation of DTMF key prompting voice finishes, and closes the interruption in the single-chip microcomputer.
2. use single-chip microcomputer according to claim 1 produces the method for DTMF key prompting voice, it is characterized in that: the concrete grammar of the two group elements circulation stack of said array A and array B is:
Array A{a
1, a
2... a
k, a
K+1... a
m; Array B{b
1, b
2... b
m, b
M+1... b
n;
Each element of array A multiply by a stack coefficient c (wherein 0＜c＜1), obtains:
A
1{a
1*c，a
2*c，...a
k*c，a
k+1*c，...a
m*c}；
Each element of array B multiply by coefficient (1-c), obtains:
B
1{b
1*(1-c)，b
2*(1-c)，...b
m*(1-c)，b
m+1*(1-c)，...b
n*(1-c)}；
And then with the element of two arrays circulation stack;
With array A
1First element a
1* c and array B
1First element b
1* (1-c) stack, A
1Second element a
2* c and B
1Second element b
2* A is carried out in (1-c) stack successively
1Last element a
m* c and B
1M element b
m* (1-c) superposes, then A
1The 1st element a
1* c and B
1M+1 element b
M+1* (1-c) stack is carried out, up to A successively
1K element a
k* c and B
1Last element b
n* (1-c) superposes, afterwards A
1K+1 element a
K+1* c and B
1First element b
1* (1-c) stack goes on so successively, up to the stacking fold that reaches setting, and k＜m＜n wherein.
3. use single-chip microcomputer according to claim 1 produces the method for DTMF key prompting voice; It is characterized in that: the value of said array A and array B element is associated with the resolution n of the DTMF keypad tone that expectation produces, and the span of array A and array B is [0～2
n]; Span after described array A and the stack of array B element is [0～2
n], wherein, n is a positive integer.
4. use single-chip microcomputer according to claim 1 produces the method for DTMF key prompting voice, and it is characterized in that: said array A and array B are one-dimension array.
5. use single-chip microcomputer according to claim 1 produces the method for DTMF key prompting voice, it is characterized in that: the stack total time that the time that said DTMF key prompting voice pronunciation finishes comprises array A and array B and stack are accomplished the back and are arrived impeding shutdown preceding free time.
6. use single-chip microcomputer according to claim 1 produces the method for DTMF key prompting voice, it is characterized in that: the stacking fold of said array A and array B is that the stack total time/array A of array A and array B and the single of array B superpose the time.
7. use single-chip microcomputer according to claim 1 produces the method for DTMF key prompting voice, it is characterized in that: described sampling point value is sinusoidal rule and distributes.
8. use single-chip microcomputer according to claim 1 produces the method for DTMF key prompting voice, it is characterized in that: the described sinusoidal wave y=2 that adopts
nThe function of sin (ω x), wherein, n is a positive integer.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114979814A (en) * | 2021-09-07 | 2022-08-30 | 中移互联网有限公司 | Dialing detection method and device under dual-tone multi-frequency-band transmission scene and electronic equipment |
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| CN101001146A (en) * | 2006-06-28 | 2007-07-18 | 华为技术有限公司 | Audio service processing circuit and audio card terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101001146A (en) * | 2006-06-28 | 2007-07-18 | 华为技术有限公司 | Audio service processing circuit and audio card terminal |
Non-Patent Citations (1)
| Title |
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| 刘高潮: "用单片机实现DTMF信号译码", 《电子测量技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114979814A (en) * | 2021-09-07 | 2022-08-30 | 中移互联网有限公司 | Dialing detection method and device under dual-tone multi-frequency-band transmission scene and electronic equipment |
| CN114979814B (en) * | 2021-09-07 | 2023-09-05 | 中移互联网有限公司 | Dialing detection method and device under double-tone multi-band internal transmission scene and electronic equipment |
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