CN2243096Y - Signal numeralization instrument - Google Patents
Signal numeralization instrument Download PDFInfo
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- CN2243096Y CN2243096Y CN 95208886 CN95208886U CN2243096Y CN 2243096 Y CN2243096 Y CN 2243096Y CN 95208886 CN95208886 CN 95208886 CN 95208886 U CN95208886 U CN 95208886U CN 2243096 Y CN2243096 Y CN 2243096Y
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Abstract
The utility model relates to a signal numeralization instrument which integrates signal amplification, antialiasing filtering and analog-to-digital conversion, etc. into an independent instrument. Only through the connection between a printer parallel interface of a microcomputer and the microcomputer, the computer control and the data transfer of the instrument are completed. The signal numeralization instrument is composed of a signal conversion part, a main control part and a manual control part. The control parameters in the signal numeralization process, such as magnification, low-pass cut-off frequency, analog / digital sampling frequency, etc., both can be controlled manually and can also be controlled by programs. The instrument has the advantages of wide amplification gain range, steep antialiasing attenuation, high sampling frequency, simultaneous two-channel sampling and multiple extension channels, etc., which can be used for processing engineering signals.
Description
The utility model relates to a kind of signal digitizer, belongs to the technology of instrument and meter field.
Signal digitalized is the analog voltage signal that needs is carried out the computer digit fractional analysis, as measuring the voltage signal that measures with sensor or any other voltage signal, be subjected to carry out a series of pre-service in the computer-controlled integrated system at one, and finally be converted into the digital quantity signal digitizer and only be connected and swap data by printer parallel port with computing machine.It is that digital information processing system is the most basic, also is one of most important component, is that modern test analysis is requisite, and engineering application background is widely arranged.
Utilize multi-purpose computer to replace the special signal processor to carry out signal Processing and analysis, become a current megatrend of signal Processing both at home and abroad.Present signal digitalized processing is that amplification, anti-aliasing filtering and analog to digital conversion etc. are all linked together by instrument that separates or device and carry out work mostly.Analog to digital conversion then is to insert in the expanded slot of computer with the form of computing machine expander board to work.Need to connect respectively unified debugging during measurement.Make that like this digitalizer kind of signal is numerous and diverse, very lack of standardization, versatility is bad.Some online signal Processing particularly, it is often very difficult to work together.For example, vibration in the vehicle operating process, noise and monitoring of working condition etc. use portable or notebook type microcomputer at present mostly, and existing analog-digital commutator (A/D plate) all is difficult to be installed in this class microcomputer, and that general microcomputer is worked under this environment is very inconvenient, sometimes even be difficult to carry out.In addition, because amplification, anti-aliasing filtering and analog-to-digital released state make that measurement is loaded down with trivial details, and it are program control to be difficult for realization, influenced the reliability and the accuracy of measurement result to a certain extent.
The purpose of this utility model is a kind of signal digitizer of design, to solve the problem that exists in the above-mentioned signal testing, amplification, anti-aliasing filtering and the analog to digital conversion etc. of signal are integrated in the independent device, only be connected with microcomputer, finish computer control and data transfer this device by the printer parallel port on the microcomputer.
The signal digitizer of the utility model design is made up of signal transformation part, main control part and hand control part, and signal transformation wherein partly comprises:
(1) multichannel converter (U51) that outside 8 road voltage signals are inserted;
(2) with the two-stage programmable amplifier that amplifies of voltage signal of input, by chip (U53, U39) and operational amplifier (U101, U102, U103, U104) composition;
(3) signal after the above-mentioned amplification is carried out the low-pass filter (U42) and the operation amplifier circuit (U105) of anti-aliasing filtering;
(4) signal behind the above-mentioned anti-aliasing filtering is carried out sampling holder (U44) and the A/D transducer (U46) that A/D changes;
(5) in order to the digital quantity after the A/D conversion is sent into the data latches (U50, U52 and U54) of computing machine by the printer parallel port line.
Main control part wherein comprises:
(1) control information that computing machine is sent here by printer parallel port is assigned to the bus driver (U1) on each latch;
(2) signal latch of the gain amplifier signal of latch signal conversion fraction (U3 and U5, U4 and (U6);
(3) in order to the data latches of control A/D enabling signal and frequency filtering signal (U7, U8, U9) and timer (U17, U18);
(4) select the data latches (U10) of 1 control information in order to 8 of control signal conversion fraction;
(5) the address gating signal decoding that computing machine is sent here by the printer parallel port line, the address decoder (U15 and U16) and the trigger (U55-58) of gating.
Hand control part wherein comprises:
(1) receives manual control information, 8 spring-loaded pushbuttons of the amplifier gain of control signal conversion portion and frequency filtering;
(2) accept filter frequency manual ringing counter U23 and with the code translator (U30) of LED display control state;
(3) select gating pulse, and it is delivered to the analog switch (U33) of signal transformation part low-pass filter;
(4) through connect signal that produces according to manual control information generates filtering by-pass governing signal, and it is led to the gate circuit (G1) of signal transformation partial simulation switch (U43) with control filtering bypass;
(5) the manual control information of reception amplifier gain makes its counter that becomes the gain control signal of two-stage amplifier (U25) and code translator (U29 and U31), control signal is latched the latch (U35 and U37) of output again;
(6) coordinate the master control of amplifier gain and the phase inverter G2-G4 and the gate circuit (G5 and G6) of controlling bypass second level amplifier of manual control transformation;
(7) lever indicator (U34 and U36) of the state of a control of control LED display amplifier gain.
Description of drawings:
Fig. 1 is the composition frame chart of the signal digitizer of the utility model design.
Fig. 2 is the circuit theory diagrams of the signal transformation part of signal digitizer.
Fig. 3 is the main control part circuit theory diagrams.
Fig. 4 is the hand control part circuit theory diagrams.
Introduce content of the present utility model in detail below in conjunction with accompanying drawing.This signal digitizer by fully independently, A, B two passages that circuit is identical constitute, for brevity, below to Fig. 2, signal transformation shown in Figure 4 part and manually the composition and the circuit theory of a passage of part give explanation, but in main control part shown in Figure 3, still keep the control information of two passages.
Signal transformation partial circuit principle as shown in Figure 2.Outside 8 road voltage signals (CH0-CH7) insert through multichannel converter U51 (4501), and the control information that U51 sends here according to main control part (ASLC) therefrom selects 1 the tunnel as input.The input signal of choosing is through digital to analog converter U53 and U39 (DAC0832) and operational amplifier U101, U102, and the two-stage programmable amplifier that U103 forms amplifies.The gain controlling information of programmable amplifier (AMA1) and (AMA2) by the control of main control part or hand control part.
Signal after the amplification carries out anti-aliasing filtering by low-pass filter U42 (RF5609).Frequency filtering gating pulse (LPFACLK) is controlled by hand control part analog switch U33.The signal that comes out from anti alias filter carries out the A/D conversion by sampling holder U44 (LF398) and A/D transducer U46 (AD574) and obtains digital quantity.A/D conversion start information (ADRC) is provided by the timer U17 of main control part; Ending message (1/GT1) is also sent the U17 of main control part back to.Digital quantity is through data latches U50, and U52 and U54 (74LS373) divide three times by the printer parallel port line, send into computing machine, and its gating signal (ALIE, AMOE, AHOE) is provided by the address decoder U15 of main control part.U8 (LB1405) is used to show the signal level after the amplification.Analog switch U38 (4053) is used for bypass first order amplifier, its control signal (A
*1) from hand control part ... U31, analog switch U41 (4053) is used for bypass second level amplifier, and its control signal (A/DC/AC) is from the G6 of hand control part.Analog switch U43 (4053) is in order to set the bypass of wave filter, and its control signal (ALPFEN) is provided by the G1 of manual part.
The control information that the main control part receiving computer is sent here is to control the work of whole signal transformation part.Fig. 3 is the circuit theory diagrams of main control part.The control data that computing machine is sent here by the printer parallel port line (DIN0-7) is assigned on each latch through bus driver U1 (74HCT245).Data latches U3 and U5 (74HC373) latch and send the gain of A channel two-stage amplifier.Data latches U7, U8 (74HC373) and timer U17 (8253) joint coordination work, generate A/D enabling signal (ADRC) with control, and this signal is sent into the analog to digital converter U46 of signal transformation part, and receive the A/D end signal (1GT0) that U46 sends back to, send A/D end signal (AOUT) to printer parallel port thus.The clock input (CLK2) of timer U17 is from the standard time clock pulsing circuit.Data latches U9, U8 (74HC373) and timer U18 (8253) jointly control the frequency filtering control signal (2OUT0,2OUT1) that generates A, B two passages.A channel frequency filtering control signal (2/OUT0) is sent to the analog switch U33 of manual control part, coordinates with the control frequency filtering with manual part again.The input clock CLK0 of U18 is from the standard time clock pulsing circuit.Data latches U10 (74HC273) latchs 8 of A, B two passages and selects 1 control information (ASLC, BSLC), and the information of A channel (ASLC) is sent to the U51 of conversion of signals part.The address gating signal that computing machine is sent here by the printer parallel port line (AIN0-2 and AIN3) is through address decoder U15 and U16 (74HC138) decoding, and the delay pulse that produces through trigger U55-U58 (74HC221) is controlled the gating of each latch again.U15 also translates the A/D translation data gating control signal (ALOE, AMOE, AHOE, BLOE, BMOE, BHOE) of A, B two passages, and the gating control signal of A channel (ALOE, AMOE, AHOE) is sent to U50, U52 and the U54 of conversion of signals part respectively.
The circuit theory of manual control part as shown in Figure 4, this instrument is by 8 spring-loaded pushbutton (A, B two passages) (A channel is LPAU to receive manual control information, LPAD, AMAU, AMAD), amplifier gain and frequency filtering with the control signal conversion portion, counter U23 (74HC193) accepts the manual control information of frequency filtering, use the LED display control state through code translator U30 (74LS138), and control analog switch U33 (74LS151) selects from the gating pulse (2/OUT0) of main control part still from one of gating pulse (CLK1-6) of standard time clock circuit, as the gating pulse (LPFACLK) of anti-aliasing filtering frequency, be sent to the U42 of conversion of signals part then.Gate circuit G1 generates filtering by-pass governing signal (ALPFEN) according to the through connect signal that manual control information produces, and the U43 that is sent to the signal transformation part is with control filtering bypass.The manual control information of counter U25 (74HC193) reception amplifier gain, the gain control data through code translator U29 and U31 (74HC138) become two-stage amplifier latchs output (AMA1, AMA2) through latch U35 and U37 (74HC240) again.Latch U61 (74HC373) locking gain is 1 o'clock a control data (AMA1).Phase inverter G2-G4 coordinates the master control of amplifier gain and the manually conversion of control; Gate circuit G5 and G6 control second level amplifier gain are 1 o'clock, generate control signal (A/DC/AC), and it is sent to conversion of signals part U41 with control bypass second level amplifier.Draw the control signal (A that first order amplifier gain manually is controlled to be at 1 o'clock from U31
*1), is sent to conversion of signals part U38, with the bypass of control first order amplifier.The state of a control of lever indicator U34 and U36 (74LS373) control LED display amplifier gain.
The utility model has the advantages that not only to make and measure conveniently that system is terse, and the numeral of signal Control parameter in the change process, such as multiplication factor, low-pass cut-off frequencies, A/D sample frequency etc. both Can be manual, also can be fully program control. And gain amplifier wide ranges (72Bd) is arranged, and anti-mixed decay is precipitous (80dB/Oct), the highest sample frequency reaches 32KHz, and binary channels is sampled simultaneously, Multi-channel extension etc. Can satisfy the processing of most of Engineering Signals. This machine is also with easy to use, powerful microcomputer Oscillograph software detects usefulness for test. This machine can by the printer parallel port on the microcomputer directly with Various microcomputers link to each other, wide adaptability, highly versatile, but and the input condition of Real-Time Monitoring signal, Carry out photoelectric alarm.
Claims (1)
1, a kind of signal digitizer is characterized in that this digitizer is made up of signal transformation part, main control part and hand control part, and wherein said signal transformation partly comprises:
(1) multichannel converter (U51) that outside 8 road voltage signals are inserted;
(2) with the two-stage programmable amplifier that amplifies of voltage signal of input, by chip (U53, U39) and operational amplifier (U101, U102, U103, U104) composition;
(3) signal after the above-mentioned amplification is carried out the low-pass filter (U42) and the operation amplifier circuit (U105) of anti-aliasing filtering;
(4) signal behind the above-mentioned anti-aliasing filtering is carried out sampling holder (U44) and the A/D transducer (U46) that A/D changes;
(5) in order to the digital quantity after the A/D conversion is sent into the data latches (U50, U52 and U54) of computing machine by the printer parallel port line;
Wherein said main control part comprises;
(1) control information that computing machine is sent here by printer parallel port is assigned to the bus driver (U1) on each latch;
(2) signal latch of the gain amplifier signal of latch signal conversion fraction (U3 and U5, U4 and (U6);
(3) in order to the data latches of control A/D enabling signal and frequency filtering signal (U7, U8, U9) and timer (U17, U18);
(4) select the data latches (U10) of 1 control information in order to 8 of control signal conversion fraction;
(5) the address gating signal decoding that computing machine is sent here by the printer parallel port line, the address decoder (U15 and U16) and the trigger (U55-58) of gating;
Hand control part wherein comprises:
(1) receives manual control information, 8 spring-loaded pushbuttons of the amplifier gain of control signal conversion portion and frequency filtering;
(2) accept filter frequency manual ringing counter U23 and with the code translator (U30) of LED display control state;
(3) select gating pulse, and it is delivered to the analog switch (U33) of signal transformation part low-pass filter;
(4) through connect signal that produces according to manual control information generates filtering by-pass governing signal, and it is led to the gate circuit (G1) of signal transformation partial simulation switch (U43) with control filtering bypass;
(5) the manual control information of reception amplifier gain makes its counter that becomes the gain control signal of two-stage amplifier (U25) and code translator (U29 and U31), control signal is latched the latch (U35 and U37) of output again;
(6) coordinate the master control of amplifier gain and the phase inverter G2-G4 and the gate circuit (G5 and G6) of controlling bypass second level amplifier of manual control transformation;
(7) lever indicator (U34 and U36) of the state of a control of control LED display amplifier gain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95208886 CN2243096Y (en) | 1995-04-28 | 1995-04-28 | Signal numeralization instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95208886 CN2243096Y (en) | 1995-04-28 | 1995-04-28 | Signal numeralization instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2243096Y true CN2243096Y (en) | 1996-12-18 |
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ID=33860067
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95208886 Expired - Fee Related CN2243096Y (en) | 1995-04-28 | 1995-04-28 | Signal numeralization instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2243096Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105654951A (en) * | 2016-01-29 | 2016-06-08 | 中国航空无线电电子研究所 | Universal multifunctional voice signal adapter |
-
1995
- 1995-04-28 CN CN 95208886 patent/CN2243096Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105654951A (en) * | 2016-01-29 | 2016-06-08 | 中国航空无线电电子研究所 | Universal multifunctional voice signal adapter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |