CN2752905Y - Digital code recording device capable of suppressing interference of environment noise - Google Patents
Digital code recording device capable of suppressing interference of environment noise Download PDFInfo
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- CN2752905Y CN2752905Y CNU200420016165XU CN200420016165U CN2752905Y CN 2752905 Y CN2752905 Y CN 2752905Y CN U200420016165X U CNU200420016165X U CN U200420016165XU CN 200420016165 U CN200420016165 U CN 200420016165U CN 2752905 Y CN2752905 Y CN 2752905Y
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- noise
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Abstract
The utility model relates to a digital code recording device capable of suppressing interference of environment noise, which is composed of an audio signal collecting circuit, an audio frequency amplifying circuit, an analog and digital converting circuit, a digital code recording and reproducing microprocessor, a flip-latch, a memory and a supervisory circuit, wherein the audio signal collecting circuit is provided with a noise frequency resisting sensing device which can transmit selected audio signals into the audio frequency sensing circuit after environment noise is filtered, and the noise frequency resisting sensing device is composed of a noise preventing complex microphone module and a suppressor chip for speech background noise. Close range speech signals led by the noise preventing complex microphone and two paths of noise signals which are approximately balanced are respectively led to two input ends of the suppressor chip for speech background noise by two output signal ends. Audio signals after processing and noise filtering are led into the audio frequency amplifying circuit by the input end of the audio signal collecting circuit, and digital signals processed by the analog and digital converting circuit enter into the flip-latch under the control of the digital recording and reproducing microprocessor and are stored in the memory then.
Description
Technical field
The utility model is the improvement to existing digital recording device, and specifically one makes existing digital sound recording device possess the structural design scheme that suppresses neighbourhood noise.
Background technology
Sound pick-up outfit is an indispensable electronic installation in the every field such as medium, communication, record, video display.Popularizing of digitizing technique made recording device produce basic leap, and from traditional disk, tape is converted into number storage to its memory device.The circuit structure of its recording device also is combined into from simple acoustic-electric converting unit and turns to by the audio collection circuit audio amplifier circuit, the combination of analog to digital converter.Analog electrical signal transforms digital signal, micro-computer technology and integrated technology that modernization is ripe, successfully produced digital videocorder microprocessor circuit chip MCU, it can will make it deposit in the F1ash storer by latch according to the requirement of supervisory routine and keyboard instruction in an orderly manner through the audio digital signals of analog-to-digital conversion, and in needs, take out the institute's sound of depositing breath successively and transport to the D/A switch circuit in an orderly manner by latch and become analog electrical signal, remove to drive loudspeaker and reappear the sound signal of recording, the basic circuit structure of Here it is present high-quality digital recording and playing device.It can reproduce the recording primary sound very exactly, and recording quality is good, is easy to preserve, and is difficult for distortion.But no matter how good the effect of its recording is, also can't change the direct interference that former record environmental noise brings.That is to say that under the prerequisite that can't improve neighbourhood noise the digital recording device comes down to rely donkey gold saddle, has no practical significance.Except in the superior recording studio of equipment, in fact the digital recording device can't bring into play its structural advantage.
Summary of the invention
The purpose of this utility model is to provide the structural design of the digital recording device of the anti-ambient noise interference of a kind of energy.
Concrete technical scheme is in the audio signal sample circuit in the digital recording device, to design one road noise resistance separately and keep pouring in induction device.This device can be distinguished microphone 15cm with the background noise beyond interior sound signal and the 15cm, and with the noise elimination, only with effective audio signal output to audio amplifier circuit AGC, then through amplifying, the A/D conversion deposits storer in by latch and finishes recording work under digital recording playback microprocessor management.Recording quality under the rugged surroundings is greatly improved, and having the audio frequency sensing device of filtering the function of making an uproar is to be combined by an anti-noise complex mic integration module CX1110 and voice background noise suppressor chip CX1421.The former is the anti-noise complex mic module that the utility application (200320111202.0) according to the inventor is made, and the latter is the integrated circuit (IC) chip that the patent of invention (03121988.8) according to the inventor designs.The former can take out the ambient noise signal of low coverage sound signal and two-way approximate equilibrium, the latter then can discern this two kinds of signals effectively according to the former two-way output, and export effective sound signal, the undesired signal that the elimination environmental noise produces, thus reach the purpose of design that anti-environmental noise disturbs.
Provide a specific embodiment circuit diagram below, and how to realize in conjunction with the Figure further illustrates the purpose of this utility model.
Description of drawings
Fig. 1 is a structure principle chart that can suppress the digital recording device of ambient noise interference.
U wherein
1Be an anti-noise complex mic module, specifically adopting model is CX1110, U
2Be the ground unrest suppressor chip, specifically adopting model is CX1421, U
3Be a controlled electronic switch, specifically adopting model is CD4053, U
4ABe an electronic switch, specifically can adopt CD4066, U
4BBe reverser, specifically can adopt CD40106, AGC representative simulation signal amplification circuit, A/D represents analog to digital conversion circuit, LCD represents monitor scope, KEY representative input supervisory keyboard, USB represents computer numeral signal download interface, MCU represents digital recording playback microprocessor, and 74LS represents intermediate latch, and Flash represents storer, MP3D/A is analog-to-digital MP3 integrated chip, W represents the power amplifier unit with loudspeaker, and I/O represents the interface with other digital transmission equipment, and RADIO represents the FM radio machine chip.J is a socket, R
1-R
5Be resistance, C
1-C
12Be electric capacity.
Embodiment
By shown in Figure 1, if the simplified design scheme, then by two output terminal (OUT of anti-noise complex mic module CX1110
1, OUT
2) the two-way audio signal of drawing directly suppresses two input end (IN of electrical equipment chip CX1421 to ground unrest
1, IN
2), what its output terminal OUT is drawn promptly is the sound signal of filtering after making an uproar again, directly it is caused audio amplifier circuit AGC, be processed into digital signal through analog to digital conversion circuit A/D again, under the instruction of digital recording playback microprocessor MCU, can enter the latch 74LS storer Flash that restores according to the order of sequence, can reach design object of the present utility model.
In the audio signal sample circuit in the utility model, except that above-mentioned noise resistance keeps pouring in the induction device, also comprise a FM radio machine chip RADIO, FM signal from this chip is connected to audio amplifier circuit AGC by a controllable electronic switch CD4053, comprise that in addition can connect the special purpose interface USB that computer is downloaded digital audio file, and with other digital audio device, as DVD, the interface I/O that is connected, they all can directly be connected on the input port of digital recording playback microprocessor MCU, the sound signal input mode of this sample recording device is promptly deposited four, wherein with two kinds of analog signaling input, with two kinds of the digital signal input, CD4053 selects by controllable electronic switch.
Wherein another purpose of the setting of CD4053 is the coupling that suppresses between voice signal and modulus converter A/D behind the interference noise, the speech amplifier AGC in order further to make.Audio output OUT after making an uproar from filter especially connects a controlled attenuation circuit, and this attenuator circuit is connected on resistance R by an electronic switch CD4066
2And R
4Between form, the trigger end of electronic switch is connected on the B pin of ground unrest suppressor chip 1421 by a reverser CD40106.Only the sound signal after making an uproar causes controllable electronic switch CD4053 from electronic switch CD4066, the controlled then note amplifier AGC that is connected to.During recording, when the background noise interference of sound signal occurred, the B pin of CX1421 can be exported a low level, transfers high level unlocking electronic switch CD4066 to by CD40106, by resistance R
2, R
4Connect the formation decay, the coupling of sound signal and next stage after the adjustment filter is made an uproar automatically.And when not having interfering noise, CD4066 closes, R
2Can ignore when sealing in the speech amplifier AGC of high impedance input, be equivalent to sound signal from the direct accessing to audio amplifying circuit of the OUT of CX1421 AGC this moment.In fact this circuit structure has had the function of automatic de-noising.
Also comprise the supervisory circuit part in the design of the present utility model, comprising supervisory keyboard KEY, LCD display devices, monitoring device MP3D/A and power amplifier unit W, this partial devices all directly links to each other with the related port of digital recording playback microprocessor MCU.The utility model can be selected under following situation, and the one, disturb very at office or ground unrest and to record in the circlet border, the 2nd, do not record, such as by monolithic FM receiver or external audio frequency input by microphone.By button or keyboard input selection instruction, MCU can send corresponding instruction, and control CD4053 analog switch is selected combination, under first kind of situation, the two-way input that makes CX1421 wherein one the tunnel with the two-way output of CX1110 in a road be connected another road input passing through R
5Ground connection, the A of CX1421
1, A
2The pin short circuit connects, and promptly CX1421 is placed and does not suppress the interference noise duty.Under second kind of situation, the combination of control analog switch disconnects the output of CX1421 chip and speech amplifier, and the output of the audio frequency of monolithic FM radio machine chip is connected with the input of speech amplifier.Or the output that directly disconnects CX1421 by socket J inserts outside audio electrical signal.Under the control of MCU,, the digital signal after the conversion is deposited in storer Flash by the A/D conversion.
Claims (5)
1, can suppress the digital recording device that environmental noise disturbs, this device comprises the audio signal sample circuit, audio amplifier circuit (AGC), analog to digital conversion circuit (A/D), digital recording playback microprocessor (MCU), latch (74LS), storer (Flash) and supervisory circuit are formed, it is characterized in that having in the audio signal sample circuit noise resistance to keep pouring in induction device, this device with the external audio signal elimination neighbourhood noise that collects after the selected audio signal send into audio amplifier circuit (AGC), through amplifying the A/D conversion, deposit storer (Flash) after latching in, this anti-noise audio sensor is specifically combined by anti-noise complex mic module (CX1110) and voice background noise suppressor chip (CX1421), the low coverage voice signal of being drawn by anti-noise complex mic module (CX1421) and the two-way noise signal of approximate equilibrium are respectively with two output signal end (OUT
1, OUT
2) cause two input end (IN of voice background noise suppressor chip (CX1421)
1, IN
2), filter noise after treatment signal is frequently introduced audio amplifier circuit (AGC) by the output terminal (OUT) of CX1421, digital signal is subjected to enter latch (74LS) under digital recorder microprocessor (MCU) control after analog to digital conversion circuit is handled, and storer (Flash) is gone in storage again.
2, the digital recording device that can suppress the environmental noise interference according to claim 1, it is characterized in that also comprising in the audio signal sample circuit monolithic FM radio machine chip (RADIO), signal from this chip is connected to audio amplifier circuit (AGC) by gate-controlled switch circuit (CD4053), also comprise being communicated with the special purpose interface (USB) and the serial or parallel interface (I/O) that links to each other with digitalized audio equipment that computerized information is downloaded, two interfaces directly are connected on the input port of digital recording playback microprocessor (MCU).
3, the digital recording device that can suppress the environmental noise interference according to claim 1, it is characterized in that keeping pouring in filter that induction device the draws back sound signal of making an uproar by noise resistance is connected to audio amplifier circuit (AGC) by selected on-off circuit (CD4053), one tunnel contrast sound signal of anti-noise complex mic module (CX1110) output is forwarded to the input end (IN of background noise inhibition chip (CD1421) by selected on-off circuit (CD4053)
2).
4, the digital recording device that can suppress the environmental noise interference according to claim 1, it is characterized in that comprising supervisory keyboard (KEY), display device (LCD), monitoring circuit (MP3 D/A) and power amplifier unit (W) in the supervisory circuit of recording device, this part all directly links to each other with digital recording playback microprocessor (MCU) related port.
5, the digital recording device that can suppress the environmental noise interference according to claim 3 is characterized in that being taken from by resistance (R through the filter noise frequency signal of controlled selector switch (CD4053)
2, R
4), gate-controlled switch (CD4066) and phase inverter (CD40106) are formed from matched attenuator, are connected to switch (CD4053) by socket (J) again, are forwarded to audio amplifier circuit (AGC) again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200420016165XU CN2752905Y (en) | 2004-05-08 | 2004-05-08 | Digital code recording device capable of suppressing interference of environment noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200420016165XU CN2752905Y (en) | 2004-05-08 | 2004-05-08 | Digital code recording device capable of suppressing interference of environment noise |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2752905Y true CN2752905Y (en) | 2006-01-18 |
Family
ID=35914314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200420016165XU Expired - Fee Related CN2752905Y (en) | 2004-05-08 | 2004-05-08 | Digital code recording device capable of suppressing interference of environment noise |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2752905Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010145278A1 (en) * | 2009-09-23 | 2010-12-23 | 中兴通讯股份有限公司 | Device and method for eliminating environmental noise |
| CN105988049A (en) * | 2015-02-28 | 2016-10-05 | 惠州市德赛西威汽车电子股份有限公司 | Debugging method for noise suppression |
| CN108074581A (en) * | 2016-11-16 | 2018-05-25 | 深圳诺欧博智能科技有限公司 | For the control system of human-computer interaction intelligent terminal |
| CN114206449A (en) * | 2019-08-08 | 2022-03-18 | 3M创新有限公司 | Wireless voice communication for self-contained breathing apparatus (SCBA) |
-
2004
- 2004-05-08 CN CNU200420016165XU patent/CN2752905Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010145278A1 (en) * | 2009-09-23 | 2010-12-23 | 中兴通讯股份有限公司 | Device and method for eliminating environmental noise |
| CN105988049A (en) * | 2015-02-28 | 2016-10-05 | 惠州市德赛西威汽车电子股份有限公司 | Debugging method for noise suppression |
| CN105988049B (en) * | 2015-02-28 | 2019-02-19 | 惠州市德赛西威汽车电子股份有限公司 | A kind of adjustment method of noise suppressed |
| CN108074581A (en) * | 2016-11-16 | 2018-05-25 | 深圳诺欧博智能科技有限公司 | For the control system of human-computer interaction intelligent terminal |
| CN114206449A (en) * | 2019-08-08 | 2022-03-18 | 3M创新有限公司 | Wireless voice communication for self-contained breathing apparatus (SCBA) |
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| 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 |