CN204347988U - A kind of pulse waveform modulation circuit - Google Patents
A kind of pulse waveform modulation circuit Download PDFInfo
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- CN204347988U CN204347988U CN201520034579.3U CN201520034579U CN204347988U CN 204347988 U CN204347988 U CN 204347988U CN 201520034579 U CN201520034579 U CN 201520034579U CN 204347988 U CN204347988 U CN 204347988U
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Abstract
A kind of pulse waveform modulation circuit disclosed in the utility model comprises modulation signal input block (001), carrier signal input block (002) and modulating unit (003), and described modulation signal input block and carrier signal input block are modulated down the modulation completed modulation signal input unit by modulating unit.For adopting special audio special chip and other schemes at present, although can meet standard-required, substantially all there is hardware cost higher in the utility model, amendment is inconvenient, needs the deficiency that special burning is programmed.Meeting existing industry standard to the requirement of medical alarm sound simultaneously, the sound signal of output can be made again to comprise, and more multiple-harmonic waveform is softer, fine and smooth resistance toly listens, more meet human hearing characteristic, such that the hardware cost of circuit is low, implementation method is simple, the requirement of standard can be met fast.
Description
Technical field
The utility model relates to a kind of pulse waveform modulation circuit.
Background technology
At present, in the industry standard of medicine equipment warning system, there is detailed requirement to the medical condition that toggle sound is reported to the police to the frequency of audible alarm and waveform.Clinical in the generation alarm of medical alarm instrument, medical personnel expect to infer from audible alarm the urgency level of warning, the seriousness of warning, the rank of even reporting to the police, and are tackled so that take appropriate measures.But also require in standard that sound should be non-intrusive and non-frightening, its sound pressure level must exceed medium priority signal in no instance., although can meet standard-required, substantially all there is hardware cost higher in current employing special audio special chip and other schemes, amendment is inconvenient, needs special burning programming.Such as: known ISD and DAC-circuit.ISD circuit production implementation procedure, first, sound to be completed by external voice tools editor the sound clip meeting industry standard, then, by microphone, sound collection is transcribed the storage area of ISD chip by loudspeaker playback, then put the sound clip first finding and will put, finally, input playback instruction the duration recording playback carries out playback, not only make and modification time long, and costly.DAC-circuit makes implementation procedure, similar with it but store position in a control unit, the overall picture of simulating whole sound again just can meet standard-required, owing to being describe Full wave shape just to exist and will store a large amount of DAC Wave datas, and take the time of a large amount of control module, in a word, cost is high, amendment inconvenience.Therefore, how to make the rising edge of alarm sound and negative edge and make it to walk unhurriedly that to change be a problem to be separated.
Summary of the invention
The purpose of this utility model produces thus, proposes a kind of pulse waveform modulation circuit.Meeting the requirement of existing industry standard to medical alarm sound, simultaneously, the sound signal of output can be made again to comprise, and more multiple-harmonic waveform is softer, fine and smooth resistance toly listens, and more meets human hearing characteristic, have circuit hardware form simple, cost of manufacture is low, the simple feature of implementation method.
The utility model realizes the technical scheme that above-mentioned purpose takes: a kind of pulse waveform modulation circuit, comprise modulation signal input block, carrier signal input block and modulating unit, described modulation signal input block and carrier signal input block are modulated down the modulation completed modulation signal input unit by modulating unit.
Input modulation waveform described in the utility model by the follower that is made up of input modulating signal unit by one end of input modulating signal input modulator; The on-off circuit that described incoming carrier waveform is made up of input carrier signal unit carries out chopping modulation to input modulating signal unit, by modulating unit, input modulating signal unit and input carrier signal unit are done modulation multiplying, produce modulated at output terminal and meet the alert audio signal of the Industry code requirements that alarm sound exports.
For adopting special audio special chip and other schemes at present, although can meet standard-required, substantially all there is hardware cost higher in the utility model, amendment is inconvenient, needs the deficiency that special burning is programmed.Meeting existing industry standard to the requirement of medical alarm sound simultaneously, the sound signal of output can be made again to comprise, and more multiple-harmonic waveform is softer, fine and smooth resistance toly listens, more meet human hearing characteristic, such that the hardware cost of circuit is low, implementation method is simple, the requirement of standard can be met fast.
Accompanying drawing explanation
Fig. 1 is circuit structure block scheme of the present utility model.
Fig. 2 is the utility model input modulation waveform figure.
Fig. 3 is the utility model incoming carrier oscillogram.
Fig. 4 is that the utility model exports modulated oscillogram.
Fig. 5-13 is the circuit theory diagrams of the utility model embodiment.
Embodiment
By reference to the accompanying drawings, by embodiment, the utility model is further described.
As shown in Figure 1 with Figure 2: the medicine equipment warning circuit of the modulation waveform described in the present embodiment comprises input modulating signal unit 001, input carrier signal unit 002 and modulating unit 003, and described modulating unit 003 is connected with input modulating signal unit 001 and input carrier signal unit 002 respectively.The follower that the modulation waveform (shown in Fig. 2) inputted is passed through to be made up of input modulating signal unit 001 is by one end of input modulating signal input modulator; The on-off circuit that incoming carrier waveform (shown in Fig. 3) is made up of input carrier signal unit 002 carries out chopping modulation to input modulating signal unit 001, input modulating signal unit 001 and input carrier signal unit 002 done modulate multiplying by modulating unit 003, produce modulated at output terminal and meet the alert audio signal (the tune oscillogram shown in Fig. 4) of the Industry code requirements that alarm sound exports.This edge alarm sound export more meet human hearing characteristic also softer, harmonic content abundant, fine and smooth.
Described input modulating signal unit 001 is known products (model: Q-8050), but is not limited to this single model, as long as NPN or N raceway groove non-switch type all can.Input carrier signal unit 002 is also known products (model: Q-9013), but is not limited to this single model, as long as NPN or N channel switches type all can, R1(1k Ω 0.25W); Modulating unit 003 adopt be known technology means: by Q1, sound signal out connector (extraneous 8 Ω 1W Φ 28 × 5.2 loudspeaker), R3(10 Ω 1W), Q2 jointly formed modulate and be converted into current direction loudspeaker realization modulate and complete driving.
Modulating unit 003 described in the utility model can adopt various ways to realize to the mode that the modulation signal of input and carrier signal are modulated.Figure 5 shows that and all adopt NPN type triode to modulate; Figure 6 shows that carrier signal adopts NPN type triode to modulate, modulation signal then adopts integrated circuit to modulate; Figure 7 shows that carrier signal adopts integrated circuit to modulate, modulation signal then adopts NPN type triode to modulate; Figure 8 shows that and all adopt integrated circuit to modulate; Figure 9 shows that and all adopt PNP type triode to modulate; Figure 10 shows that modulation signal adopts integrated circuit to modulate, carrier signal then adopts PNP type triode to modulate; Figure 11 shows that carrier signal adopts PNP type triode to modulate, modulation signal then adopts integrated circuit to modulate; Figure 12 shows that and all adopt integrated circuit to modulate; Figure 13 shows that as all adopting operational amplifier to modulate.
When the present embodiment uses: square wave carrier completes the open and close controlling to Q2 here by Q2 input modulating unit, R2(1k Ω 0.25W); Modulation wave signal is input to modulating unit by Q1 and here completes and follow; Loudspeaker, resistance R3 that modulation wave signal, the sound signal out connector of input outreach and jointly complete modulation wave signal cutting in time as Q2 during switch, thus, complete square wave carrier signal and the modulation wave signal relation that is multiplied in time, and complete and modulate and form corresponding waveform.
Claims (2)
1. a modulation waveform circuit, it is characterized in that: comprise modulation signal input block (001), carrier signal input block (002) and modulating unit (003), described modulation signal input block and carrier signal input block are modulated down the modulation completed modulation signal input unit by modulating unit.
2. modulation waveform circuit according to claim 1, is characterized in that: the follower that described input modulation waveform is passed through to be made up of input modulating signal unit (001) is by one end of input modulating signal input modulator; The on-off circuit that described incoming carrier waveform is made up of input carrier signal unit (002) 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 done modulation multiplying, produce modulated at output terminal and meet the alert audio signal of the Industry code requirements that alarm sound exports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520034579.3U CN204347988U (en) | 2015-01-19 | 2015-01-19 | A kind of pulse waveform modulation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520034579.3U CN204347988U (en) | 2015-01-19 | 2015-01-19 | A kind of pulse waveform modulation circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204347988U true CN204347988U (en) | 2015-05-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520034579.3U Expired - Fee Related CN204347988U (en) | 2015-01-19 | 2015-01-19 | A kind of pulse waveform modulation circuit |
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| CN (1) | CN204347988U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104537780A (en) * | 2015-01-19 | 2015-04-22 | 河南辉瑞生物医电技术有限公司 | Pulse waveform modulation circuit |
-
2015
- 2015-01-19 CN CN201520034579.3U patent/CN204347988U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104537780A (en) * | 2015-01-19 | 2015-04-22 | 河南辉瑞生物医电技术有限公司 | Pulse waveform modulation circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150520 |
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| CF01 | Termination of patent right due to non-payment of annual fee |