CN104537780B - A kind of impulse waveform modulation circuit - Google Patents
A kind of impulse waveform modulation circuit Download PDFInfo
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- CN104537780B CN104537780B CN201510025073.0A CN201510025073A CN104537780B CN 104537780 B CN104537780 B CN 104537780B CN 201510025073 A CN201510025073 A CN 201510025073A CN 104537780 B CN104537780 B CN 104537780B
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Abstract
A kind of impulse waveform modulation circuit disclosed by the invention includes modulated signal input block（001）, carrier signal input block（002）And modulating unit（003）, the modulated signal input block and carrier signal input block modulate the lower modulation completed to modulating signal input unit by modulating unit.The present invention is at present using special audio special chip and other schemes, although can meet standard requirement, all there is that hardware cost is higher substantially, modification is inconvenient, it is necessary to the deficiency of special burning programming.Meeting requirement of the existing professional standard to medical alarm sound simultaneously, and can includes the audio signal of output, and more harmonic wave forms are softer, exquisiteness is resistance to listens, more meet human hearing characteristic so that the hardware cost of circuit is low, implementation method is simple, can quickly meet the requirement of standard.
Description
Technical field
The present invention relates to a kind of impulse waveform modulation circuit.
Background technology
At present, in the professional standard of medicine equipment alarm system, to triggering the medical condition of audible alarm to sound report
Alert frequency and waveform has detailed requirement.When alarm occurs for medical alarm instrument, medical personnel are desirable to from sound clinic
The urgency level, the seriousness of alarm, the rank even alarmed of alarm are inferred in sound alarm, in order to take appropriate measures
Tackled.But also requiring that sound should be non-intrusive property and non-frightening in standard, its sound pressure level is under any circumstance
It all must not exceed middle signal priority.At present using special audio special chip and other schemes, although disclosure satisfy that standard will
Ask, but all have that hardware cost is higher substantially, modification is inconvenient, it is necessary to special burning programming.Such as：Known ISD and DAC
Circuit.ISD circuit production implementation process, first, sound is met into industry mark by external voice tools editor completion
Accurate sound clip, then, by sound collection and the storage part of ISD chips is transcribed into by loudspeaker playback and by microphone,
Put again and first find the sound clip to be put, finally, input playback instruct and record playback duration carry out playback, not only make with
Modification time is grown, and costly.DAC-circuit make implementation process, it is similar therewith but storage position in a control unit, again
Standard requirement can just be met by simulating the overall picture of whole sound, due to being that description Full wave shape there is and store substantial amounts of DAC ripples
Graphic data, and the time of a large amount of control units is taken, in a word, cost is high, modification inconvenience.Therefore, the upper of alarm sound how is made
Rise along with trailing edge be allowed to walk unhurriedly change be one to be solved the problem of.
The content of the invention
Thus the purpose of the present invention produces, propose a kind of impulse waveform modulation circuit.Meeting existing professional standard to doctor
With the requirement of alarm sound, meanwhile, and can make the audio signal of output include more harmonic wave forms it is softer, it is fine and smooth it is resistance to listen, more
Meet human hearing characteristic, there is the characteristics of simple circuit hardware composition, low manufacture cost, simple implementation method.
The present invention realizes that above-mentioned purpose adopts the technical scheme that：A kind of impulse waveform modulation circuit, including modulated signal
Input block, carrier signal input block and modulating unit, the modulated signal input block and carrier signal input block by
The lower modulation completed to modulating signal input unit of modulating unit modulation.
Input modulation waveform of the present invention is modulated by will be inputted by the follower that input modulating signal unit is formed
One end of signal input modulator；Described incoming carrier waveform is by the on-off circuit that input carrier signal unit is formed to input
Modulated signal unit carries out chopping modulation, is adjusted input modulating signal unit and input carrier signal unit by modulating unit
Multiplying processed, the alert audio signal of Industry code requirements that are modulated and meeting alarm sound output is produced in output end.
The present invention for using special audio special chip and other schemes at present, although can meet standard requirement, base
This all has that hardware cost is higher, and modification is inconvenient, it is necessary to the deficiency of special burning programming.Meeting existing professional standard to doctor
With the requirement of alarm sound simultaneously, and can make the audio signal of output include more harmonic wave forms it is softer, it is fine and smooth it is resistance to listen, more accord with
Close human hearing characteristic so that the hardware cost of circuit is low, implementation method is simple, can quickly meet the requirement of standard.
Brief description of the drawings
Fig. 1 is the circuit structure block diagram of the present invention.
Fig. 2 is present invention input modulation waveform figure.
Fig. 3 is incoming carrier oscillogram of the present invention.
Fig. 4 exports modulated oscillogram for the present invention.
Fig. 5-13 is the circuit theory diagrams of the specific embodiment of the invention.
Embodiment
With reference to accompanying drawing, by embodiment, the present invention is described in more detail.
As shown in Figure 1 with Figure 2：The medicine equipment alarm circuit of modulation waveform described in the present embodiment includes input and modulated
Signal element 001, input carrier signal unit 002 and modulating unit 003, the modulating unit 003 are believed with input modulation respectively
Number unit 001 and input carrier signal unit 002 connect.The modulation waveform of input（Shown in Fig. 2）By by input modulating signal
The follower that unit 001 is formed is by one end of input modulating signal input modulator；Incoming carrier waveform（Shown in Fig. 3）By inputting
The on-off circuit that carrier signal unit 002 is formed carries out chopping modulation to input modulating signal unit 001, by modulating unit 003
Input modulating signal unit 001 and input carrier signal unit 002 are made into modulation multiplying, output end produce it is modulated and
Meet the alert audio signal of the Industry code requirements of alarm sound output（Tune oscillogram shown in Fig. 4）.This edge alarm sound
Output more meets that human hearing characteristic is also softer, harmonic content is abundant, fine and smooth.
Described input modulating signal unit 001 is known products（Model：Q-8050）, but it is not limited to this single type
Number, as long as NPN or N-channel non-switch type all may be used.Input carrier signal unit 002 and known products (model：Q-
9013), but be not limited to this single model, as long as NPN or N-channel switching mode all can, R1（1kΩ 0.25W）；Modulation is single
Member 003 is using known technology means：Pass through Q1, audio signal out connector（External world's loudspeakers of 8 Ω 1W Φ 28 × 5.2
）、R3（10Ω 1W）, Q2 collectively constitute complete to modulate and be converted into current direction loudspeaker realize modulate and complete to drive.
The mode that modulating unit 003 of the present invention is modulated to the modulated signal and carrier signal of input can use more
Kind mode is realized.Fig. 5 is shown to be modulated using NPN type triode；Fig. 6 show carrier signal and uses the pole of NPN type three
Pipe is modulated, and modulated signal is then modulated using integrated circuit；Fig. 7 is shown carrier signal and adjusted using integrated circuit
System, modulated signal are then modulated using NPN type triode；Fig. 8 is shown to be modulated using integrated circuit；Shown in Fig. 9
To be modulated using PNP type triode；Figure 10 is shown modulated signal and is modulated using integrated circuit, and carrier signal is then
It is modulated using PNP type triode；Figure 11 is shown carrier signal and is modulated using PNP type triode, and modulated signal is then
It is modulated using integrated circuit；Figure 12 is shown to be modulated using integrated circuit；Figure 12 is shown to use computing
Amplifier is modulated.
When the present embodiment uses：Square wave carrier completes the open and close controlling to Q2, R2 by Q2 input modulating units herein
（1kΩ 0.25W）；Modulation wave signal is input to modulating unit by Q1 and completes to follow herein；Modulation wave signal, the sound of input
The loudspeaker of frequency signal output connector external connection, resistance R3 and Q2 during as switch are completed to modulation wave signal in the time jointly
On cutting, so as to complete be multiplied relation of the square wave carrier signal with modulation wave signal in time, and complete to modulate and formed
Corresponding waveform.
Claims (1)
1. a kind of modulation waveform circuit, it is characterized in that：Including modulated signal input block（001）, carrier signal input block
（002）And modulating unit（003）, input modulating signal passes through by modulated signal input block（001）The follower of composition will be defeated
Enter modulated signal and be input to modulating unit（003）One end；Input carrier signal passes through carrier signal input block（002）Form
On-off circuit be input to modulating unit（003）The other end, and pass through modulating unit（003）By modulated signal input block
（001）With carrier signal input block（002）Make chopping modulation multiplying, produce modulated in output end and meet alarm sound
The alert audio signal of the medicine equipment alarm Industry code requirements of output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510025073.0A CN104537780B (en) | 2015-01-19 | 2015-01-19 | A kind of impulse waveform modulation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510025073.0A CN104537780B (en) | 2015-01-19 | 2015-01-19 | A kind of impulse waveform modulation circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104537780A CN104537780A (en) | 2015-04-22 |
| CN104537780B true CN104537780B (en) | 2017-12-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510025073.0A Expired - Fee Related CN104537780B (en) | 2015-01-19 | 2015-01-19 | A kind of impulse waveform modulation circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN104537780B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102081825B (en) * | 2010-12-24 | 2012-09-19 | 埃泰克汽车电子(芜湖)有限公司 | Automobile instrument alarming sound control device and control method |
| KR101871360B1 (en) * | 2011-03-09 | 2018-06-26 | 삼성전자주식회사 | Method for outputting an audio signal and apparatus for outputting an audio signal thereof |
| CN104077862A (en) * | 2013-03-29 | 2014-10-01 | 北京谊安医疗系统股份有限公司 | Medical alarm circuit device and method |
| CN104201997B (en) * | 2014-09-01 | 2018-01-05 | 矽力杰半导体技术(杭州)有限公司 | A kind of D audio frequency amplifier |
| CN204347988U (en) * | 2015-01-19 | 2015-05-20 | 河南辉瑞生物医电技术有限公司 | A kind of pulse waveform modulation circuit |
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2015
- 2015-01-19 CN CN201510025073.0A patent/CN104537780B/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN104537780A (en) | 2015-04-22 |
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Granted publication date: 20171201 |