CN2108308U - Audiofrequency measurer - Google Patents
Audiofrequency measurer Download PDFInfo
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- CN2108308U CN2108308U CN 91232617 CN91232617U CN2108308U CN 2108308 U CN2108308 U CN 2108308U CN 91232617 CN91232617 CN 91232617 CN 91232617 U CN91232617 U CN 91232617U CN 2108308 U CN2108308 U CN 2108308U
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- China
- Prior art keywords
- signal
- counter
- effect
- latch
- measurement
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- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The utility model relates to a sound frequency measurer which is used for displaying in the digital form, particularly a sound frequency device which is used for measuring a sound source and an electrical signal. The utility model is composed of a preamplifier, an amplitude limiting shaper, a frequency measuring gate, a clock generator, a latch, a decoder, a driver, a digital display and an ejecting and following device, has the advantages of simple and convenient operation, wide use, high accuracy and low cost and can be used for the measurement of loudspeaker response width and industrial noise, medical diagnosis, the reflection of the frequency of the sound source of the running state of a machine, etc.
Description
The utility model relates to a kind of measurement of audio frequency instrument that shows with digital form, especially for the device of measuring sound source and electric signal audio frequency.
The surveying instrument of audio frequency in the prior art, formation is speech amplifier and frequency meter or oscillograph, be earlier audio frequency to be transformed into electric signal, be input to again on frequency meter or the oscillograph and show or calculate, its weak point is a complicated operation, can only measure continuous signal, is difficult to measure twinkling signal, and degree of accuracy is low, can not show with digital form intuitively, the cost height, costs an arm and a leg.
The purpose of this utility model is to avoid above-mentioned weak point of the prior art and a kind of measurement of audio frequency instrument that directly shows with digital form is provided.
In order to address the above problem and purpose, the new technical solution that the utility model provides is: be provided with prime amplifier, amplitude limit reshaper, frequency measurement gate, clock generator, latch, code translator, driver and nixie display in this measurement of audio frequency instrument.Prime amplifier can carry out preposition amplification to electric signal that enters the measurement of audio frequency instrument from the electric signal input port or the sound-source signal of importing from the microphone signal input port, and does electric signal output, delivers on the amplitude limit reshaper; Amplitude limit reshaper, its effect are that the large-signal of prime amplifier output is carried out amplitude limit, and the waveform of different shape is carried out shaping; The frequency measurement gate is in the certain hour signal strobe that clock generator provides, and allows the standard signal of limiter shaping circuit output pass through, for counter provides clock signal; Clock generator, its effect are signal strobe to be provided, to put that rapid pulse dashes, quenching pulse to frequency measurement gate, latch, counter by certain time sequence relation, produce the signal that automatically resets simultaneously and automatically reset; Counter is used for counting by the clock signal of coming from the frequency measurement gate in the certain hour; Latch, its effect are to insert and latch signal strobe to finish the current binary-coded decimal of hour counter; Code translator, it is that the latch binary-coded decimal that binary mode is represented is translated into the sign indicating number of decimal system demonstration intuitively; Driver, its effect is the signal of receiver decoder, and driving display; Nixie display is that the data that counter was counted in a period of time are shown with digital form.
In order to reach better effect, also be provided with emitter follower at the utility model measurement of audio frequency instrument prime amplifier output terminal, its effect is the electric signal that receives after preposition amplification, and the electric signal that receives is penetrated with output, in order to connecting waveform oscilloscope, the waveform of measured signal is shown.
The utility model measurement of audio frequency instrument has following advantage compared to existing technology: simple to operation, have wide range of applications, as be used to detect frequency response of loudspeaker width, measure frequency parameter of man-made noise, medical diagnosis, reflection machine run state or the like, can directly measure frequency of source continuous or moment, the degree of accuracy height, intuitively show with digital form, and with low cost.
Accompanying drawing is the embodiment of the utility model measurement of audio frequency instrument.
Fig. 1 is a measurement of audio frequency instrument electrical principle block scheme.
Fig. 2 is the circuit diagram of prime amplifier, amplitude limit reshaper and emitter follower.
Fig. 3 is the metering circuit schematic diagram.
Below in conjunction with accompanying drawing essentiality content of the present utility model and characteristic thereof are done further detailed explanation.
Among Fig. 2:
Microphone socket CZ
1-φ 6.5;
Edge connector CZ
2, CZ
3-Q9-FKJ;
Resistor: R
1-100K; R
2-470K; R
3-1K; R
4-5.1K; R
5-1K;
R
7－10K；R
8－30K；R
9－1K；R
10－1M；R
1－10K；
R
12－2.4M；R
13－1.5M；
Potentiometer R
6-100K;
Operational amplifier U
4-LM741; U
5-LM318;
Four Sheffer stroke gate U
10-CD4011;
Diode V
3, V
4-2CK83E;
Triode V
5-3DK2B;
Capacitor C
9, C
10-50V8P; C
11-50V0.1 μ; C
12, C
13, C
14-16V4.7 μ; C
15-50V100P; C
16-16V4.7 μ; C
17-50V0.1 μ; C
23-50V0.1 μ.
Among Fig. 3:
Counter/oscillator U
6-CD4060;
Trigger U
7-CD4013;
Counter U
8-CD40161;
Four Sheffer stroke gate U
9, U
10-CD4011;
Monostalbe trigger U
11, U
12-CD4528;
Capacitor C
18-16V33 μ; C
19, C
20-50V0.1 μ; C
24-50V8P;
Resistor R
14-20K; R
15-10K; R
16-10K; R
20-1M.
Fig. 1 is a measurement of audio frequency instrument electrical schematic diagram.This measurement of audio frequency instrument mainly comprises prime amplifier, amplitude limit reshaper, frequency measurement gate, clock generator, counter, latch, code translator, driver and nixie display.The measurement of audio frequency instrument has two signal inputs, and one is the electric signal input port, and another is the microphone signal input port, and the signal of importing from these two input ports all amplifies through prime amplifier, then to next stage amplitude limit reshaper output electric signal; The amplitude limit reshaper at first carries out amplitude limit to the large-signal of sending here from prime amplifier, and the waveform to different shape carries out shaping then, carries to the next stage metering circuit; The frequency measurement gate is in the certain hour signal strobe that clock generator provides in the metering circuit, allow the standard signal of amplitude limit reshaper output pass through, for the counter of back provides clock signal, at the signal strobe duration of existence, counter begins to counting by the clock signal of coming from the frequency measurement gate, till signal strobe finishes; When signal strobe finishes, clock generator is put rapid pulse to latch output one and is dashed, the current binary-coded decimal of counter is inserted and latched, when putting rapid pulse and dash finishing, clock generator is exported a quenching pulse to counter, with being latched the binary-coded decimal removing that device latchs, wait for counting next time then.The effect of clock generator is signal strobe to be provided, to put that rapid pulse dashes, quenching pulse to frequency measurement gate, latch, counter by certain time sequence relation, it is the control center of whole frequency measurement process, it also produces the signal that automatically resets and automatically resets after sending the counter O reset pulse.The binary-coded decimal of latch is the number of representing with binary mode, must be translated into the demonstration sign indicating number of representing with decimal system form by code translator.Driver, the signal of its receiver decoder, and driving display.The number that nixie display is counted counter within a certain period of time shows intuitively, and the numerical value that shows is exactly the frequency of measured signal.In addition, in order to reach better effect, also be provided with emitter follower at this measurement of audio frequency instrument prime amplifier output terminal, the electric signal of reception after preposition amplification, the electric signal that receives is penetrated with output, in order to connecting oscillograph, the waveform of measured signal is shown.
Fig. 2 is the circuit diagram of prime amplifier, amplitude limit reshaper and emitter follower.Prime amplifier is by two operational amplifier U
4And U
5Form U
4Amplifier the gain here is 1, and input signal is not done any amplification, and it mainly acts on is the gain bandwidth product of following and improve prime amplifier, and measured signal is through U
4Improve behind the gain bandwidth product by U
5Do preposition amplification, prime amplifier amplifies mainly by U input signal
5Bear U
5Amplifier can be by adjusting its feedback resistance R
6Change the size of its gain, thereby make the signal output amplitude of prime amplifier satisfy the demand of subsequent conditioning circuit.The amplitude limit reshaper is mainly by diode V
3, V
4With NAND gate circuit U
10A, U
10BForm, earlier the large-signal of prime amplifier output is carried out amplitude limit, by not circuit the waveform of different shape is carried out shaping then, sine wave signal, triangular signal are become square-wave signal.The formation of emitter follower is triode (V
5), resistor (R
6, R
7, R
9), by C
13What coupling was come does emitter following output after the electric signal after the preposition amplification or acoustical signal are amplified by V5, make waveform oscilloscope obtain the undistorted waveform of original signal.
Fig. 3 is the metering circuit schematic diagram.Metering circuit is made up of frequency measurement gate, counter, latch, clock generator etc.The frequency measurement gate itself is a Sheffer stroke gate, it is in the second signal strobe that clock generator provides, allow the standard signal of shaping circuit output pass through, for the counter of back provides clock signal, one second the signal strobe duration of existence, counter begins to counting by the clock signal of coming from the frequency measurement gate, till a second, signal strobe finished.When one second signal strobe finishes, clock generator is put rapid pulse to latch output one and is dashed, insert and latch putting the current binary-coded decimal of number, when putting rapid pulse and dash finishing, clock generator is exported a quenching pulse to counter, with being latched the binary-coded decimal removing that device latchs, wait for counting next time then.Clock generator mainly is made up of crystal oscillator, frequency divider, trigger, monostable oscillator and Sheffer stroke gate etc.Metering circuit is by frequency divider U
6Draw one second signal strobe and be added to U
7Make to measure sequential and distribute, measured signal is through U
10A, U
10BBe added to U
10DInput end, signal strobe is added to U
10DThe input end other end, when signal strobe is between high period, U is passed through in measured signal
10DBe added to the input end of count display.Behind the display delayed one second, measure timing distributor and send quenching pulse wait measurement next time.The binary-coded decimal of latch is the number of representing with binary mode, and the task of seven-segment decoder is it to be translated into metric seven sections LET show sign indicating number, and drives seven sections LED demonstration charactrons, and the number that counter was counted in a second shows intuitively.Seven sections shown numerals of LET charactron are exactly the frequency of measured signal.
In the counting display part, counter adopts CD4518; Latch/decipher/driver employing CD4511; Nixie display adopts the seven segment numerical display tube.
After tested, the key technical indexes of the utility model measurement of audio frequency instrument is as follows:
1. sensitivity: be not inferior to 30mV;
2. resolution: 1Hz;
3. frequency measurement scope: 50Hz-100KHz;
4. frequency-measurement accuracy: be better than 3 ‰;
5. range 1-24000Hz.
Claims (2)
1, a kind of measurement of audio frequency instrument of the present utility modelly is characterised in that it comprises:
Prime amplifier, its effect are to carry out preposition amplification to the electric signal that enters the measurement of audio frequency instrument from the electric signal input port or from the sound-source signal of microphone signal input port input, and do electric signal output, deliver on the amplitude limit reshaper;
Amplitude limit reshaper, its effect are that the large-signal of prime amplifier output is carried out amplitude limit, and the waveform of different shape is carried out shaping;
Frequency measurement gate, its effect are in the certain hour signal strobe that clock generator provides, and allow the standard signal of limiter shaping circuit output pass through, for counter provides clock signal;
Clock generator, its effect are signal strobe to be provided, to put that rapid pulse dashes, quenching pulse to frequency measurement gate, latch, counter by certain time sequence relation, produce the signal that automatically resets simultaneously and automatically reset;
Counter is used for counting by the clock signal of coming from the frequency measurement gate in the certain hour;
Latch, its effect are to insert and latch signal strobe to finish the current binary-coded decimal of hour counter;
Code translator, it is that the latch binary-coded decimal that binary mode is represented is translated into the sign indicating number of decimal system demonstration intuitively.
Driver, its effect is the signal of receiver decoder, and drives nixie display;
Nixie display, it is that the data that counter was counted in a period of time are shown with digital form.
2, the described measurement of audio frequency instrument of claim 1, it is characterized in that being provided with emitter follower at the prime amplifier output terminal, its effect is the electric signal that receives after preposition amplification, and the electric signal that receives is penetrated with output, in order to connecting oscillograph, the waveform of measured signal is shown.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91232617 CN2108308U (en) | 1991-12-18 | 1991-12-18 | Audiofrequency measurer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91232617 CN2108308U (en) | 1991-12-18 | 1991-12-18 | Audiofrequency measurer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2108308U true CN2108308U (en) | 1992-06-24 |
Family
ID=4937613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91232617 Granted CN2108308U (en) | 1991-12-18 | 1991-12-18 | Audiofrequency measurer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2108308U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109259742A (en) * | 2018-09-28 | 2019-01-25 | 南通市第人民医院 | A kind of obstetrics and gynecology department pregnant woman electronic pulse monitoring bracelet |
-
1991
- 1991-12-18 CN CN 91232617 patent/CN2108308U/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109259742A (en) * | 2018-09-28 | 2019-01-25 | 南通市第人民医院 | A kind of obstetrics and gynecology department pregnant woman electronic pulse monitoring bracelet |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Huang Ming Document name: payment instructions |
|
| 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 |