CN103914006A - Circuit for controlling waveform of edge of audio envelope line - Google Patents

Circuit for controlling waveform of edge of audio envelope line Download PDF

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Publication number
CN103914006A
CN103914006A CN201210592787.6A CN201210592787A CN103914006A CN 103914006 A CN103914006 A CN 103914006A CN 201210592787 A CN201210592787 A CN 201210592787A CN 103914006 A CN103914006 A CN 103914006A
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CN
China
Prior art keywords
circuit
resistance
edge
data selection
selection unit
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CN201210592787.6A
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Chinese (zh)
Inventor
王绥生
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Beijing Aeonmed Co Ltd
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Beijing Aeonmed Co Ltd
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Priority to CN201210592787.6A priority Critical patent/CN103914006A/en
Publication of CN103914006A publication Critical patent/CN103914006A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a circuit for controlling a waveform of an edge of an audio envelope line. The circuit comprises a channel resistance adjustment unit, a data selection unit and a control unit. The control unit generates a control signal at an edge of an audio signal, and controls a conducting sequence of a data transmission channel corresponding to the data selection unit so that the resistance of a data selection channel transmitting the audio signal increases or decreases progressively in a chronological order at the edge of the audio signal. Thus, the waveform of the edge of the audio envelope line can rise or fall, and the rising and falling edge gradient problem of a medical alarm audio is effectively solved. Meanwhile, the envelope waveform of the outputted audio signal can be more gentle, delicate and consistent with human auditory characteristics. The circuit has the advantages of simple implementation method and low hardware cost.

Description

A kind of circuit of controlling audio pack winding thread edge waveform
Technical field
The present invention relates to sound signal envelope manufacturing technology, relate in particular to a kind of circuit of controlling audio pack winding thread edge waveform.
Background technology
The industry standard of medicine equipment warning system, has all carried out detailed description from the medical condition that triggers audible alarm to frequency and the waveform of audible alarm.In the time of medical warning instrument generation alarm, medical personnel expect from audible alarm, to infer the character of urgency level, the warning of warning, the reason of reporting to the police even, so that the reply emergency case that takes appropriate measures.Establish a capital and require sound signal to there is gradient profile according to master gauge, require audible ringing signal to there is rising edge and negative edge.How making the rising edge of alarm sound and negative edge is a problem to be solved.In prior art, can adopt integrated circuit (IC) chip (as A/D conversion chip etc.) to the control of audible ringing signal rising edge and negative edge gradient, this kind of mode hardware cost is higher, and circuit is more complicated.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of circuit of controlling audio pack winding thread edge waveform, adopts analog switch chip to be equipped with associated control signal, has effectively solved the rising of medical alarm sound and the problem of negative edge gradient.
For achieving the above object, the present invention is achieved through the following technical solutions:
A circuit of controlling audio pack winding thread edge waveform, described circuit comprises aisle resistance regulon, data selection unit and control module, described data selection unit is connected with aisle resistance regulon and control module respectively;
Described data selection unit comprises at least two paths of data transmission channel;
Described aisle resistance regulon has multichannel output, input end incoming audio signal, and each output terminal is connected with the data transmission channel of described data selection unit respectively, and wherein, aisle resistance regulon input end is to the resistance difference of each output terminal;
Described control module produces control signal at sound signal edge, control the conducting order of the respective data transfer passage of described data selection unit, make the resistance of data selection passage of transmission of audio signal at sound signal edge increasing or decreasing in chronological order, decline or rise thereby realize sound signal envelope edge waveform.
Further, described aisle resistance regulon comprises multiple resistance of serial connection successively, the corresponding circuit-switched data transmission channel of output terminal of described each resistance.
Further, multiple resistances of described serial connection are successively identical.
Further, described multiple resistances of serial connection successively meet logarithm Changing Pattern.
Further, described each resistance can use equivalent series resistance circuit, equivalent parallel resistance circuit or equivalent string parallel resistance circuit to substitute.
Further, described data selection unit comprises analog switch chip or multichannel data selection chip.
Further, described data selection unit adopts eight to select an analog switch chip.
Further, described data selection unit can be selected an analog switch chip or a slice 16 to select an analog switch chip to realize 16 by two eight and select a function.
Further, described control module comprises microcontroller, and the control signal that described microcontroller changes according to predefined procedure by I/O interface timing output is selected different data transmission channel conductings.
Technical solution of the present invention, produce control signal at sound signal edge by control module, control the conducting order of the respective data transfer passage of described data selection unit, make the resistance of data selection passage of transmission of audio signal at sound signal edge increasing or decreasing in chronological order, the rising of medical alarm sound and the problem of negative edge gradient are effectively solved, simultaneously, can make the sound signal envelope waveform of output softer, fine and smooth, more meet human hearing characteristic, described circuit has advantages of that implementation method is simple, hardware cost is low.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the circuit of control audio pack winding thread of the present invention edge waveform;
Fig. 2 is the circuit theory diagrams of the control audio pack winding thread edge waveform of one embodiment of the invention;
Fig. 3 is the control audio pack winding thread edge oscillogram of one embodiment of the invention;
Fig. 4 is the principle assumption diagram of the aisle resistance regulon of another embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is the structured flowchart of the circuit of control audio pack winding thread of the present invention edge waveform.As shown in Figure 1, described circuit comprises aisle resistance regulon 101, data selection unit 102 and control module 103, and described data selection unit 102 is connected with aisle resistance regulon 101 and control module 103 respectively;
Described data selection unit 102 comprises at least two paths of data transmission channel;
Described aisle resistance regulon 101 has multichannel output, input end incoming audio signal, and each output terminal is connected with the data transmission channel of described data selection unit 102 respectively, and wherein, aisle resistance regulon 101 input ends are to the resistance difference of each output terminal;
Described control module 103 produces control signal at sound signal edge, control the conducting order of the respective data transfer passage of described data selection unit 102, make the resistance of data selection passage of transmission of audio signal at sound signal edge increasing or decreasing in chronological order, decline or rise thereby realize sound signal envelope edge waveform.
Described aisle resistance regulon 101 comprises multiple resistance of serial connection successively, the corresponding circuit-switched data transmission channel of output terminal of described each resistance.
Described data selection unit 102 comprises analog switch chip or multichannel data selection chip.
Described control module 103 comprises the microcontrollers such as single-chip microcomputer, DSP, MCU, and the control signal that described microcontroller changes according to predefined procedure by I/O interface timing output is selected different data transmission channel conductings.
Wherein, in aisle resistance regulon 101, be connected in series successively the resistance that resistance changes according to certain funtcional relationship rule, control audio pack winding thread rising edge or negative edge gradient and carry out respective change according to function rule, for adopting what function rule not have strict restriction.As identical in the multiple resistances that are connected in series successively, control audio pack winding thread rising edge or the linear variation of negative edge gradient; Change as the multiple resistances that are connected in series successively become logarithmic parabola, control audio pack winding thread rising edge or negative edge gradient and change according to logarithmic function, this non-linear rule changes envelope edge and more meets human hearing characteristic.The effect of sound signal envelope rising edge or negative edge is relevant with the data transmission channel quantity of data selection unit 102, and number of channels is more, and the envelope effect of output is softer, fine and smooth.
In described aisle resistance regulon 101, each resistance can use equivalent series circuit, equivalent parallel circuit or equivalent string parallel circuit to substitute.
Embodiment of the present invention adopt the supporting associated control signal of multi-channel data selector part, can effectively control sound signal envelope rising edge or negative edge gradient, make the sound signal of output more meet human hearing characteristic, described circuit implementing method is simple, hardware cost is low.
Fig. 2 is the circuit theory diagrams of the control audio pack winding thread edge waveform of first embodiment of the invention.As shown in Figure 2, in the present embodiment data selection unit 102 to adopt model be the analog switch chip of 74HC4051.74HC4051 is 8 tunnels analogy MUX/demultplexers, with 3 digital selecting sides (9,10 and 11 pins are respectively by A2, B2 and C2 mark), 1 low effective Enable Pin (6 pin identify with INH), 8 independent input/output terminals (pin one, 2,4,5,12~15 pins) and 1 public input/output terminal (3 pins identify with COM).Chip enable end (INH) be low level constantly, one of them of 8 switches will be chosen (low resistance state) by the control signal of A2, B2 and C2 input.When Enable Pin (INH) is high level, all switches all enter high-impedance state.The VCC of chip and GND are the energization pins of digital control end (A2, B2, C2 and INH), and VCC to the GND scope of 74HC4051 is 2.0V~10.0V.Analog input/output terminal (pin 0-7, COM) of 74HC4051 swings between upper limit VCC and lower limit VEE, and VCC-VEE should be no more than 10.0V.As MUX/demultplexer, VEE will be connected to GND upper (being generally ground connection).
Aisle resistance regulon 101 adopts 7 resistance to be connected in series successively (R0~R7), and the upper end of resistance string is carried out filtering processing by input capacitance C1 to the alarm signal of access, and the lower end of resistance string connects GND.Described aisle resistance regulon 101 has multichannel output, and the output terminal of each resistance is exported as a road, and each output terminal is connected on the data transmission channel of data selection unit.In the present embodiment, data selection unit has 8 data selector channel, except each resistance output terminal is connected on data transmission channel, aisle resistance regulon 101 input ends is also exported to the data transmission channel that is connected to data selection unit as a road.
The control signal of 74HC4051 analog switch chip comes from the I/O mouth of microprocessor 103, the control signal that microprocessor changes according to predefined procedure by I/O interface timing output at sound signal edge, described sound signal is as the signal producing for microprocessor, microprocessor can be judged sound signal edge in the time of output audio signal, as as described in sound signal be the outputs of other circuit units, after by supporting testing circuit, signal edge being detected, pass to microcontroller.By changing the conducting order of state control data transmission channel of A2, B2, C2, make aisle resistance regulon 101 input ends to output terminal resistance value increasing or decreasing in order, thereby realize decline or the rising of sound signal output packet winding thread edge waveform.Before output audio signal, also comprise and adopt output capacitance C2 to carry out filtering processing to output signal.
For example digital control end A2, B2 and C2 accept microprocessor according to the signal difference 000,001,010,011,100,101,110 and 111 of time sequencing output, control respectively 0 to 7 data selection passage conducting, data selection passage access resistance increases progressively, the voltage signal of output is decayed successively, now, sound signal envelope edge waveform presents negative edge; Digital control end A2, B2 and C2 accept microprocessor according to the signal difference 111,110,101,100,011,010,001 and 000 of time sequencing output, control respectively 0 to 7 data selection passage conducting, data selection passage access resistance successively decreases, make the voltage signal of output increase successively, now, sound signal envelope presents rising edge.
Hence one can see that, as long as the data transmission channel of in good time change 74HC4051 analog switch chip just can obtain standard compliant alarm sound and rise and negative edge envelope.
The present embodiment is just illustrated with 8 tunnels analogy switch chips, and in actual applications, number of channels can be selected as required.As described in 8 tunnels analogy switch chips can also with the analog switch chip of two 4 passages substitute.As in order to make alarm sound edge envelope waveform softer, fine and smooth, can adopt 16 to select a data selection device to realize.16 select a function can directly adopt 16 select one switch chip to complete or select a tunnels analogy switch chip to realize by two 8.
Described aisle resistance regulon 101 adopts 7 resistance to be connected in series successively, the resistance of resistance can be selected as required, when resistance changes according to certain funtcional relationship rule, this circuit control audio pack winding thread rising edge or negative edge gradient are carried out respective change according to function rule.Fig. 3 is the envelope edge oscillogram of the sound signal of one embodiment of the invention.For sound signal envelope waveform is changed according to shown in Fig. 3, the linear rule of resistance string R0~R7 resistance, as identical in all resistances, be all made as 1K, as shown in a in Fig. 3, input signal is an amplitude modulation sound signal, after the processing of circuit of the present embodiment, there is rising edge and negative edge gradient envelope in the sound signal of output, as shown in b in Fig. 3 in the time starting with end, according to the standard-required of medicine equipment warning sound, the rising edge of output audio and negative edge Tr=10 ~ 20%Td.In this embodiment, resistance crosstalk resistance is all identical value, so output audio signal envelope waveform is carried out linear change according to identical gradient.If resistance value in resistance string is to be also linear rule to change, but the resistance of each resistance is different, and the sound signal presenting comprises that wave form varies gradient can be variant.
In addition,, while variation according to non-linear rule as resistance string R0~R7 resistance, the sound signal envelope rising edge of output and negative edge gradient non-linear change.Change as resistance string R0~R7 resistance is logarithmic parabola, sound signal envelope rising edge and the negative edge gradient of output are nonlinearities change, more meet human auditory system feature.
Fig. 4 is the principle assumption diagram of the aisle resistance regulon of another embodiment of the present invention.In Fig. 2, aisle resistance regulon adopts independently resistance to be connected on the data transmission channel of data selection unit as output.In addition, described each individual resistors unit can substitute by equivalent electrical circuit.Describe as an example of the R0 in aisle resistance regulon 101 example, if the resistance of R0 is 1K, in Fig. 2, directly select the measuring resistance access of 1K, in the situation that there is no 1K measuring resistance, can realize by the resistance of two 2K is in parallel, or can realize by the resistance series connection of two 0.5K, or can carry out connection in series-parallel realization by the resistance of suitable resistance.In Fig. 4, a represents to adopt two resistance parallel connections to carry out equivalent circuit structure, and figure b represents to adopt two resistance series connection to carry out equivalent circuit structure.In aisle resistance regulon 101, each resistance can carry out equivalence as required.
According to the structure in Fig. 4, passages regulate resistance unit is carried out after equivalence, whole circuit can carry out the variation of various ways.
Technical scheme of the present invention adopts MUX to be equipped with associated control signal, the rising of medical alarm sound and the problem of negative edge gradient are effectively solved, make the sound signal envelope waveform of output softer, fine and smooth, more meet human hearing characteristic, described circuit has advantages of that implementation method is simple, hardware cost is low.
Above are only preferred embodiment of the present invention and institute's application technology principle, any be familiar with those skilled in the art the present invention disclose technical scope in, the variation that can expect easily or replacement, all should be encompassed in protection scope of the present invention.

Claims (9)

1. a circuit of controlling audio pack winding thread edge waveform, is characterized in that, described circuit comprises aisle resistance regulon, data selection unit and control module, and described data selection unit is connected with aisle resistance regulon and control module respectively;
Described data selection unit comprises at least two paths of data transmission channel;
Described aisle resistance regulon has multichannel output, input end incoming audio signal, and each output terminal is connected with the data transmission channel of described data selection unit respectively, and wherein, aisle resistance regulon input end is to the resistance difference of each output terminal;
Described control module produces control signal at sound signal edge, control the conducting order of the respective data transfer passage of described data selection unit, make the resistance of data selection passage of transmission of audio signal at sound signal edge increasing or decreasing in chronological order, decline or rise thereby realize sound signal envelope edge waveform.
2. the circuit of control audio pack winding thread according to claim 1 edge waveform, is characterized in that, described aisle resistance regulon comprises multiple resistance of serial connection successively, the corresponding circuit-switched data transmission channel of output terminal of described each resistance.
3. the circuit of control audio pack winding thread according to claim 2 edge waveform, is characterized in that, multiple resistances of described serial connection are successively identical.
4. the circuit of control audio pack winding thread according to claim 2 edge waveform, is characterized in that, described multiple resistances of serial connection successively meet logarithm Changing Pattern.
5. according to the circuit of the control audio pack winding thread edge waveform described in claim 3 or 4, it is characterized in that, described each resistance can use equivalent series resistance circuit, equivalent parallel resistance circuit or equivalent string parallel resistance circuit to substitute.
6. according to the circuit of the control audio pack winding thread edge waveform one of claim 1 to 5 Suo Shu, it is characterized in that, described data selection unit comprises analog switch chip or multichannel data selection chip.
7. the circuit of control audio pack winding thread according to claim 6 edge waveform, is characterized in that, described data selection unit adopts eight to select an analog switch chip.
8. the circuit of control audio pack winding thread according to claim 6 edge waveform, is characterized in that, described data selection unit can be selected an analog switch chip or a slice 16 to select an analog switch chip to realize 16 by two eight and select a function.
9. the circuit of control audio pack winding thread according to claim 6 edge waveform, it is characterized in that, described control module comprises microcontroller, and the control signal that described microcontroller changes according to predefined procedure by I/O interface timing output is selected different data transmission channel conductings.
CN201210592787.6A 2012-12-29 2012-12-29 Circuit for controlling waveform of edge of audio envelope line Pending CN103914006A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104539268A (en) * 2015-01-19 2015-04-22 河南辉瑞生物医电技术有限公司 Circuit for controlling edge waveform of audio envelope line

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1624656A (en) * 2003-08-19 2005-06-08 微软公司 System and method for implementing a flat audio volume control model
US20050267402A1 (en) * 2004-05-27 2005-12-01 Janice Stewart Multi-state alarm system for a medical pump

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1624656A (en) * 2003-08-19 2005-06-08 微软公司 System and method for implementing a flat audio volume control model
US20050267402A1 (en) * 2004-05-27 2005-12-01 Janice Stewart Multi-state alarm system for a medical pump
CN1950118A (en) * 2004-05-27 2007-04-18 巴克斯特国际公司 Multi-state alarm system for a medical pump

Non-Patent Citations (1)

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Title
陈廷侠、张东亮: "基于89C51单片机控制放大器增益的设计", 《新乡学院学报(自然科学版)》, vol. 29, no. 4, 31 August 2012 (2012-08-31), pages 313 - 315 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104539268A (en) * 2015-01-19 2015-04-22 河南辉瑞生物医电技术有限公司 Circuit for controlling edge waveform of audio envelope line
CN104539268B (en) * 2015-01-19 2017-12-19 河南辉瑞生物医电技术有限公司 A kind of circuit for controlling audio envelope edgewave shape

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