CN204349939U - A kind of audio signal edge waveform control circuit - Google Patents
A kind of audio signal edge waveform control circuit Download PDFInfo
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- CN204349939U CN204349939U CN201520034529.5U CN201520034529U CN204349939U CN 204349939 U CN204349939 U CN 204349939U CN 201520034529 U CN201520034529 U CN 201520034529U CN 204349939 U CN204349939 U CN 204349939U
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Abstract
Disclosed in the utility model, a kind of audio signal edge waveform control circuit comprises the pulse width modulator unit (001) containing microcontroller, low-pass filter unit (002) and final stage follow unit (003), the described pulse width modulator unit containing microcontroller modulates the modulating wave of the corresponding pulsewidth of rear generation to input signal, namely this modulating wave forms audio signal edge control waveform again after the high order harmonic component in low-pass filter unit filtering modulating wave, what this audio signal edge control waveform was formed after following unit again can output audio signal edge control waveform signal.Efficiently solve the rising of medical alarm sound and the problem of trailing edge gradient.Meanwhile, the audio signal envelope waveform of output can be made softer, fine and smooth, more meet human hearing characteristic, described circuit has the advantage that implementation method is simple, hardware cost is low.
Description
Technical field
The utility model relates to audio signal edge wave control technology, particularly relates to a kind of audio signal edge
Waveform control circuit.
Background technology
The industry standard of medicine equipment warning system, the frequency from the medical condition of toggle sound warning to audible alarm and waveform have all carried out detailed description.When the generation alarm of medical alarm instrument, medical personnel expect to infer from audible alarm the urgency level of warning, the character of warning, the reason of even reporting to the police, so that the reply emergency case that takes appropriate measures.Establish a capital according to standard gauge and require that audio signal has gradient profile, namely require that audible ringing signal has rising edge and trailing edge.How making the rising edge of alarm sound and trailing edge is a problem to be solved.Can adopt integrated circuit (IC) chip (as DAC conversion chip etc.) to the control of audible ringing signal rising edge and trailing edge gradient in prior art, this kind of mode hardware cost is higher, and circuit is more complicated.
Summary of the invention
The technical problems to be solved in the utility model is to provide a kind of audio signal edge waveform control circuit, adopts containing the pulse width modulator unit of microcontroller, low-pass filter unit and the technical scheme of following unit, has
Solve the rising of medical alarm sound and the problem of trailing edge gradient to effect.
For achieving the above object, the utility model is achieved through the following technical solutions: a kind of audio signal edge waveform control circuit, comprise the pulse width modulator unit containing microcontroller, low-pass filter unit and final stage follow unit, the described pulse width modulator unit containing microcontroller modulates the modulating wave of the corresponding pulsewidth of rear generation to input signal, this modulating wave is formation control audio pack winding thread edge waveform again after the high order harmonic component in the middle of low-pass filter unit filtering, this audio signal edge waveform is followed through final stage can exporting of being formed after unit again and is controlled audio pack winding thread edge waveform signal.
The utility model is exported by the pulse width modulator unit containing microcontroller and presents the pulse train that duty ratio linearly rises gradually or decline changes, via low-pass filter unit by after the high order harmonic component filtering in interior, make the rising edge of generation or trailing edge produce linear change, then export via the edge alarm sound that final stage is followed needed for unit generation.
The time that corresponding duty ratio and this duty ratio continue is transferred to the pulse width modulator of its inside by the pulse width modulator unit containing microcontroller described in the utility model according to time sequencing, namely pulse width modulator exports the modulation waveform of corresponding pulsewidth; The low-passing part of radio-frequency component in the middle of input modulation waveform via low-pass filter unit carries out filtering and low-frequency component is carried out integration by this modulation waveform under the effect of input low pass filter, after low-pass filter unit, namely change duty ratio in time in turn after low-pass filter unit, be converted into the wave character at waveform envelope line rising edge or trailing edge.
Low-pass filter unit described in the utility model comprises a joint RC low-pass filter circuit or two joint or more piece RC low-pass filter circuits.
It is integrated circuit or NPN transistor or N channel field-effect pipe that final stage described in the utility model follows unit.
The utility model, by the technical scheme adopting the pulse width modulator unit containing microcontroller, low-pass filter unit and final stage to follow unit, efficiently solves the rising of medical alarm sound and the problem of trailing edge gradient.The pulse width modulator unit containing microcontroller arranged produces the modulating wave of corresponding pulsewidth after the pulse width modulator unit modulation containing microcontroller to input signal, namely this modulating wave is formed and a kind ofly controls audio pack winding thread edge waveform after the high order harmonic component in the middle of low-pass filter unit filtering again, and this is a kind of controls one that audio pack winding thread edge waveform formed after following unit again and can export and control audio pack winding thread edge waveform signal.As long as the input signal that to sum up suitable control contains the pulse width modulator unit of microcontroller just can realize the edge waveform of alert audio signal required increasing or decreasing in chronological order, efficiently solve the rising of medical alarm sound and the problem of trailing edge gradient.Meanwhile, the audio signal envelope waveform of output can be made softer, fine and smooth, more meet human hearing characteristic, described circuit has the advantage that implementation method is simple, hardware cost is low.
Accompanying drawing explanation
Fig. 1 is block diagram of the present utility model.
Fig. 2 is the circuit theory diagrams of the utility model embodiment 1.
Fig. 3 is that microcontroller of the present utility model transfers to pulse width modulator oscillogram.
Fig. 4 is alarm sound output waveform figure of the present utility model.
Fig. 5 is the circuit theory diagrams of the utility model embodiment 2.
Fig. 6 is the circuit theory diagrams of the utility model embodiment 3.
In figure: 001, pulse width modulator unit, 002, low-pass filter unit, 003, final stage follows unit.
Embodiment
By reference to the accompanying drawings, by embodiment, the utility model is further described.
Embodiment 1
As shown in Figure 1: pulse width modulator unit 001, low-pass filter unit 002 and final stage that a kind of audio signal edge waveform control circuit described in the present embodiment comprises containing microcontroller follow unit 003, and described low-pass filter unit 002 is followed unit 003 with the pulse width modulator unit 001 containing microcontroller and final stage respectively and is connected.What the described pulse width modulator unit 001 containing microcontroller was selected is known products, comprises and realizes by one chip microcomputer, microcontroller, dsp chip, fpga chip, CPLD chip etc. all hardware configuration that pulse width modulator function contains controller.What the present embodiment was selected is PIC16F690 and all microcontrollers comprising pulse width modulator, can realize the modulation range of 0-100% and there is not dead band; Described low-pass filter unit 002 comprises a joint RC low-pass filter circuit, and described low-pass filter circuit can be also two joints or more piece, and what select is also known products (wherein, R specification: 24k Ω, 0.24W; C specification: 0.01uF, 25V); Described final stage follows unit 003 for integrated circuit U1, and what select is also known products (model: LMV324I).
When the present embodiment uses, by control inputs (timing waveform shown in Fig. 3), according to step signal.As control inputs signal linearly rises or the change that declines gradually; Export via the pulse width modulator unit 001 containing microcontroller and present the pulse train that duty ratio linearly rises gradually or decline changes, this duty ratio gradually linearly rise or the pulse train of the change that declines via low-pass filter unit 002 by after the high order harmonic component filtering in interior, the rising edge of generation or trailing edge is made to produce linear change, follow via final stage alarm sound output (timing waveform shown in Fig. 4) that unit 003 produces required energy again, it is also softer, fine and smooth and smooth that alarm sound output in this edge more meets human hearing characteristic.
As shown in Figure 2: the pulse width modulator unit 001 containing microcontroller is averaged the waveform after dividing as Fig. 2 in time according to the All Time of the rising edge that will realize or trailing edge, then, voltage when relevant voltage and 100% is divided by and transforms into corresponding duty ratio D1, D2, D3,, the time that corresponding duty ratio and this duty ratio continue is transferred to the pulse width modulator of its inside by microcontroller according to time sequencing, namely pulse width modulator exports the modulation waveform of corresponding pulsewidth; Namely this modulation waveform is the input signal transferring to low-pass filter unit, under the effect of input low pass filter, the low-passing part of the radio-frequency component in the middle of input modulation waveform via low-pass filter unit is carried out filtering and low-frequency component is carried out integration, after low-pass filter unit, namely change duty ratio in time in turn after low-pass filter unit, be converted into the wave character at waveform envelope line rising edge or trailing edge.Because, low-pass filter unit can not with the cause of very large load, thus end add follow isolation that unit completes with rear class after export for signal.
Embodiment 2
As shown in Figure 5: the audio signal edge waveform control circuit described in the present embodiment is on the architecture basics of embodiment 1, described final stage is followed unit 003 and is adopted NPN transistor Q1 to substitute integrated circuit U1 to play final stage Following effect.The operation principle of the present embodiment is identical with embodiment Fig. 1, before explained and do not repeated them here.
Embodiment 3
As shown in Figure 6: the audio signal edge waveform control circuit described in the present embodiment is on the architecture basics of embodiment 1, described final stage is followed unit 003 and is adopted N channel field-effect pipe Q1 to substitute integrated circuit U1 to play final stage Following effect.The operation principle of the present embodiment is identical with embodiment Fig. 1, before explained and do not repeated them here.
Claims (5)
1. an audio signal edge waveform control circuit, it is characterized in that: comprise the pulse width modulator unit (001) containing microcontroller, low-pass filter unit (002) and final stage follow unit (003), the described pulse width modulator unit containing microcontroller modulates the modulating wave of the corresponding pulsewidth of rear generation to input signal, namely this modulating wave forms audio signal edge control waveform again after the high order harmonic component in low-pass filter unit filtering modulating wave, what this audio signal edge control waveform was formed after following unit again can output audio signal edge control waveform signal.
2. audio signal edge according to claim 1 waveform control circuit, it is characterized in that: the described pulse width modulator unit (001) containing microcontroller exports and presents the pulse train that duty ratio linearly rises gradually or decline changes, via low-pass filter unit (002) by after the high order harmonic component filtering in interior, make the rising edge of generation or trailing edge produce linear change, then export via the edge alarm sound that final stage is followed needed for unit (003) generation.
3. audio signal edge according to claim 1 waveform control circuit, it is characterized in that: the time that corresponding duty ratio and this duty ratio continue is transferred to the pulse width modulator of its inside by the described pulse width modulator unit (001) containing microcontroller according to time sequencing, namely pulse width modulator exports the modulation waveform of corresponding pulsewidth; The low-passing part of radio-frequency component in the middle of input modulation waveform via low-pass filter unit carries out filtering and low-frequency component is carried out integration by this modulation waveform under the effect of input low pass filter, after low-pass filter unit, namely change duty ratio in time in turn after low-pass filter unit, be converted into the wave character at waveform envelope line rising edge or trailing edge.
4. audio signal edge according to claim 1 waveform control circuit, is characterized in that: described low-pass filter unit (002) comprises a joint RC low-pass filter circuit or two joint or more piece RC low-pass filter circuits.
5. audio signal edge according to claim 1 waveform control circuit, is characterized in that: described final stage follows unit (003) for integrated circuit U1 or NPN transistor Q1 or N channel field-effect pipe Q1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520034529.5U CN204349939U (en) | 2015-01-19 | 2015-01-19 | A kind of audio signal edge waveform control circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520034529.5U CN204349939U (en) | 2015-01-19 | 2015-01-19 | A kind of audio signal edge waveform control circuit |
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| CN204349939U true CN204349939U (en) | 2015-05-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104518761A (en) * | 2015-01-19 | 2015-04-15 | 河南西瑞医疗电子技术有限公司 | Audio signal edge waveform control circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104518761A (en) * | 2015-01-19 | 2015-04-15 | 河南西瑞医疗电子技术有限公司 | Audio signal edge waveform control circuit |
| CN104518761B (en) * | 2015-01-19 | 2018-01-30 | 河南西瑞医疗电子技术有限公司 | A kind of audio signal edge waveform control circuit |
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