CN105321547A - Novel recording system based on analog/digital conversion circuit - Google Patents
Novel recording system based on analog/digital conversion circuit Download PDFInfo
- Publication number
- CN105321547A CN105321547A CN201510856064.6A CN201510856064A CN105321547A CN 105321547 A CN105321547 A CN 105321547A CN 201510856064 A CN201510856064 A CN 201510856064A CN 105321547 A CN105321547 A CN 105321547A
- Authority
- CN
- China
- Prior art keywords
- triode
- pole
- amplifier
- resistance
- analog
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Amplifiers (AREA)
Abstract
The invention discloses a novel recording system based on an analog/digital conversion circuit. The novel recording system is characterized by mainly consisting of a microprocessor, a storage, an analog/digital conversion circuit, an audio filtering circuit and a timer which are connected with a microprocessor, an audio acquisition module connected with the analog/digital conversion circuit, and a loudspeaker connected with the audio filtering circuit, wherein the audio acquisition module is connected with the microprocessor. According to the system disclosed by the invention, interfering noise can be suppressed and needed audio signals can be retained; and therefore, the audio playback definition can be improved. The audio signal is converted into a digital electric signal by virtue of the analog/digital conversion circuit, the conversion efficiency of the analog/digital conversion circuit is high, and signal conversion is complete, so that the processing efficiency of the system disclosed by the invention is improved.
Description
Technical field
The present invention relates to a kind of recording system, specifically refer to a kind of Novel recording system based on analog to digital conversion circuit.
Background technology
At present, along with the needs of the development of science and technology and people's routine work, study and life, sound pick-up outfit has become the requisite appliance and electronic of every field, and the digital recorder with high-quality recording effect is then subject to the favor of people more.
But existing sound pick-up outfit all can be recorded various sound when recording, and it cannot well suppress impurity audio frequency when processing sound signal, very large noise interference therefore can be subject to when people return playback.
Summary of the invention
The object of the invention is to overcome existing sound pick-up outfit and well to the defect that impurity audio frequency suppresses, a kind of Novel recording system based on analog to digital conversion circuit cannot be provided.
Object of the present invention is achieved through the following technical solutions: a kind of Novel recording system based on analog to digital conversion circuit, primarily of microprocessor, the storer be connected with microprocessor respectively, analog to digital conversion circuit, audio frequency filtering circuit and timer, the audio collection module be connected with analog to digital conversion circuit, and the loudspeaker be connected with audio frequency filtering circuit forms, described audio collection module is also connected with microprocessor, analog-digital conversion circuit as described is by amplifier P1, amplifier P2, amplifier P3, amplifier P4, triode VT8, one end is connected with the positive pole of amplifier P1, the other end forms the resistance R9 of the input end of this analog to digital conversion circuit, P pole is connected with the output terminal of amplifier P1, the diode D6 that N pole is then connected with the positive pole of amplifier P2, be serially connected in the resistance R11 between the negative pole of amplifier P1 and the N pole of diode D6, positive pole is connected with the N pole of diode D6, the electric capacity C5 of minus earth, N pole is connected with the negative pole of electric capacity C5, the diode D5 that P pole is then connected with the negative pole of amplifier P1 after resistance R10, be serially connected in the resistance R13 between the negative pole of amplifier P2 and output terminal, be serially connected in the resistance R12 between the base stage of triode VT8 and the output terminal of amplifier P4, negative pole is connected with the output terminal of amplifier P2, the electric capacity C6 that positive pole is connected with the positive pole of amplifier P3, N pole is connected with the positive pole of amplifier P4, the diode D7 that P pole is then connected with the positive pole of amplifier P3, one end is connected with the negative pole of amplifier P3, the resistance R14 of other end ground connection, and the resistance R15 be serially connected between the output terminal of amplifier P3 and the negative pole of amplifier P4 forms, grounded collector, its emitter of described triode VT8 are then connected with the positive pole of amplifier P2, the negative pole of described amplifier P4 forms the output terminal of this analog to digital conversion circuit and is connected with microprocessor, the input end of analog-digital conversion circuit as described is connected with audio collection module.
Further, described audio frequency filtering circuit is by differential amplifier circuit, and the suppression circuit be connected with differential amplifier circuit output terminal forms; The input end of described differential amplifier circuit is connected with microprocessor, suppresses the output terminal of circuit to be then connected with loudspeaker.
Described differential amplifier circuit is by triode VT1, triode VT2, triode VT3, the electric capacity C1 that negative pole is connected with the base stage of triode VT1 after resistance R1, positive pole then forms the input end of this differential amplifier circuit, the diode D1 that P pole is connected with the collector of triode VT1, N pole connects+20V voltage, and the potentiometer R2 be serially connected between the emitter of triode VT1 and the base stage of triode VT3 forms; The control end of described potentiometer is connected with suppression circuit; The base stage of described triode VT3 is connected with the collector of triode VT2, its emitter is then connected with suppression circuit, its grounded collector; The emitter of described triode VT2 is connected with the collector of triode VT1, its base stage is then connected with suppression circuit.
Described suppression circuit is by filtering chip U, triode VT4, triode VT5, triode VT6, triode VT7, one end is connected with the N pole of diode D1, the resistance R4 that the other end is then connected with the VDD pin of filtering chip U after resistance R5, positive pole is connected with the tie point of resistance R5 with resistance R4, the electric capacity C2 that negative pole is then connected with the base stage of triode VT2, N pole is connected with the VDD pin of filtering chip U, the diode D2 that P pole is then connected with the base stage of triode VT2, one end is connected with the EN pin of filtering chip U, the resistance R3 that the other end is then connected with the emitter of triode VT3, positive pole is connected with the base stage of triode VT5 after resistance R6, the electric capacity C4 that negative pole is then connected with the collector of triode VT5, N pole is connected with the positive pole of electric capacity C4, the diode D3 that P pole is then connected with the DRV pin of filtering chip U, N pole is connected with the emitter of triode VT5, the diode D4 that P pole is then connected with the emitter of triode VT7 after resistance R7, positive pole is connected with the FB pin of filtering chip U, the electric capacity C3 that negative pole is then connected with the P pole of diode D4, and the resistance R8 be serially connected between the base stage of triode VT7 and collector forms, the TOFF pin of described filtering chip U is connected with the control end of potentiometer R2, its COMP pin is then connected with the emitter of triode VT3, its VSS pin is connected with the base stage of triode VT6, its CS pin is then connected with the base stage of triode VT4, the emitter of described triode VT6 is connected with the negative pole of electric capacity C3, its collector is then connected with the base stage of triode VT7, the collector of described triode VT7 is connected with-20V voltage, the output terminal that the emitter of described triode VT4 is connected with the base stage of triode VT5, its collector then forms this suppression circuit.
Described filtering chip U is UCT4392 integrated chip.
The present invention comparatively prior art compares, and has the following advantages and beneficial effect:
(1) the present invention can suppress interfering noise and retain the sound signal of needs, therefore can improve the sharpness that recording is play.
(2) the present invention is provided with timer, this timer can arrange recording starting time and recording stand-by time, when recording starting time then can start recording automatically, and automatically stop according to the recording stand-by time set, range of application of the present invention so can be made wider.
(3) the present invention is converted to digital electric signal by analog to digital conversion circuit sound signal, and the conversion efficiency of this analog to digital conversion circuit is high, and signal conversion is more thorough, thus improves treatment effeciency of the present invention.
Accompanying drawing explanation
Fig. 1 is one-piece construction block diagram of the present invention.
Fig. 2 is the structural drawing of audio frequency filtering circuit of the present invention.
Fig. 3 is the structural drawing of analog to digital conversion circuit of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1, Novel recording system of the present invention, primarily of microprocessor, the storer be connected with microprocessor respectively, analog to digital conversion circuit, audio frequency filtering circuit and timer, the audio collection module be connected with analog to digital conversion circuit, and the loudspeaker be connected with audio frequency filtering circuit forms.Described audio collection module is also connected with microprocessor.
Wherein, audio collection module is for gathering extraneous sound signal, and its SV-2602 sound acquisition module that Wei Linke Science and Technology Ltd. of Shenzhen can be selected to produce realizes.Analog to digital conversion circuit is used for the sound signal collected being converted to digital electric signal and sending to microprocessor.Microprocessor is then as the control center for invention, and it preferentially adopts AT89S52 main control chip to realize.Timer is for setting record length, and storer is then for storing collected sound signal.Audio frequency filtering circuit can suppress the noise signals existed in sound signal, to improve the sharpness exporting sound.This timer, storer and loudspeaker adopt existing technology to realize.
As shown in Figure 2, described audio frequency filtering circuit can suppress the noise signals collected, and it is by differential amplifier circuit, and the suppression circuit be connected with differential amplifier circuit output terminal forms.The input end of described differential amplifier circuit is connected with microprocessor, suppresses the output terminal of circuit to be then connected with loudspeaker.
Described differential amplifier circuit can process the sound signal collected, and it is by triode VT1, triode VT2, triode VT3, resistance R1, electric capacity C1, and potentiometer R2 and diode D1 forms.
During connection, the input end that the negative pole of electric capacity C1 is connected with the base stage of triode VT1 after resistance R1, its positive pole then forms this differential amplifier circuit.The P pole of diode D1 is connected with the collector of triode VT1, its N pole connects+20V voltage.Potentiometer R2 is then serially connected between the emitter of triode VT1 and the base stage of triode VT3.The control end of described potentiometer is connected with suppression circuit; The base stage of described triode VT3 is connected with the collector of triode VT2, its emitter is then connected with suppression circuit, its grounded collector.The emitter of described triode VT2 is connected with the collector of triode VT1, its base stage is then connected with suppression circuit.
Sound signal input come in after first through electric capacity C1 filtering, then after resistance R1, input to the differential amplifier be made up of triode VT1 and triode VT2 amplify.This resistance R1 is biasing resistor, and it can avoid sound signal in the process of amplifying, occur the existing picture of distortion.Diode D1 is the common P pole diode of this differential amplifier, which determines the common-mode rejection ratio of this differential amplifier circuit and the size of static working current at the corresponding levels.
Described suppression circuit by filtering chip U, triode VT4, triode VT5, triode VT6, triode VT7, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, diode D2, diode D3, diode D4, electric capacity C2, electric capacity C3 and electric capacity C4 form.
During connection, one end of resistance R4 is connected with the N pole of diode D1, its other end is then connected with the VDD pin of filtering chip U after resistance R5.The positive pole of electric capacity C2 is connected with the tie point of resistance R5 with resistance R4, its negative pole is then connected with the base stage of triode VT2.The N pole of diode D2 is connected with the VDD pin of filtering chip U, its P pole is then connected with the base stage of triode VT2.One end of resistance R3 is connected with the EN pin of filtering chip U, its other end is then connected with the emitter of triode VT3.The positive pole of electric capacity C4 is connected with the base stage of triode VT5 after resistance R6, its negative pole is then connected with the collector of triode VT5.The N pole of diode D3 is connected with the positive pole of electric capacity C4, its P pole is then connected with the DRV pin of filtering chip U.The N pole of diode D4 is connected with the emitter of triode VT5, its P pole is then connected with the emitter of triode VT7 after resistance R7.The positive pole of electric capacity C3 is connected with the FB pin of filtering chip U, its negative pole is then connected with the P pole of diode D4.Between the base stage that resistance R8 is then serially connected in triode VT7 and collector.
Meanwhile, the TOFF pin of described filtering chip U is connected with the control end of potentiometer R2, its COMP pin is then connected with the emitter of triode VT3, its VSS pin is connected with the base stage of triode VT6, its CS pin is then connected with the base stage of triode VT4.The emitter of described triode VT6 is connected with the negative pole of electric capacity C3, its collector is then connected with the base stage of triode VT7.The collector of described triode VT7 is connected with-20V voltage.The emitter of described triode VT4 is connected with the base stage of triode VT5, its collector then forms the output terminal of this suppression circuit and is connected with loudspeaker.
This electric capacity C3, triode VT6, triode VT7, resistance R7 and resistance R8 form a constant-current source circuit, and it provides constant working current to filtering chip U.After sound signal is delivered into filtering chip U, because the useful sound signal in sound signal is different from the frequency of noise signals, this filtering chip U retains accounting for most useful sound signal in sound signal, and right noise signals suppresses, what therefore export from the CS pin of this filtering chip U is useful sound signal, this useful sound signal, via triode VT4, exports to loudspeaker after the high-pass filtering circuit that triode VT5, resistance R6 and electric capacity C4 form carries out filtering.In order to reach better implementation result, this filtering chip U is preferably UCT4392 integrated chip to realize.
As shown in Figure 3, this analog to digital conversion circuit by amplifier P1, amplifier P2, amplifier P3, amplifier P4, triode VT8, resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, electric capacity C5, electric capacity C6, diode D5, diode D6 and diode D7 form.
Wherein, amplifier P1, resistance R9, resistance R10, resistance R11, diode D5 and diode D6 form a filtering and amplifying circuit.During connection, one end of resistance R9 is connected with the positive pole of amplifier P1, its other end forms the input end of this analog to digital conversion circuit and is connected with audio collection module.The P pole of diode D6 is connected with the output terminal of amplifier P1, its N pole is then connected with the positive pole of amplifier P2.Resistance R11 is then serially connected between the negative pole of amplifier P1 and the N pole of diode D6.The positive pole of electric capacity C5 is connected with the N pole of diode D6, its minus earth.The N pole of diode D5 is connected with the negative pole of electric capacity C5, its P pole is then connected with the negative pole of amplifier P1 after resistance R10.This filtering and amplifying circuit carries out amplification filtering process the sound signal of input.
In addition, between the resistance R13 negative pole that is serially connected in amplifier P2 and output terminal.Resistance R12 is serially connected between the base stage of triode VT8 and the output terminal of amplifier P4.The negative pole of electric capacity C6 is connected with the output terminal of amplifier P2, its positive pole is connected with the positive pole of amplifier P3.The N pole of diode D7 is connected with the positive pole of amplifier P4, its P pole is then connected with the positive pole of amplifier P3.One end of resistance R14 is connected with the negative pole of amplifier P3, its other end ground connection.Resistance R15 is serially connected between the output terminal of amplifier P3 and the negative pole of amplifier P4.Meanwhile, the grounded collector of described triode VT8, its emitter are then connected with the positive pole of amplifier P2.The negative pole of described amplifier P4 forms the output terminal of this analog to digital conversion circuit and is connected with microprocessor.
This amplifier P2 and resistance R13 forms a buffering buffer circuit.Amplifier P3, amplifier P4 and diode D7 then form a change-over circuit, and this change-over circuit is converted to digital electric signal sound signal and exports.This buffering buffer circuit then plays a part to form a connecting link, and it can avoid sound signal to occur the existing picture of loss at the filtering and amplifying circuit of prime, and can guarantee that the digital electric signal after change-over circuit conversion is undistorted.
During work, operator sets recording starting time and recording stand-by time in timer, when recording starting time then microprocessor send a signal to audio collection module, this audio collection module starts gather extraneous sound signal and flow to analog to digital conversion circuit.This analog to digital conversion circuit is converted to digital electric signal the sound signal collected and is transferred to microprocessor, and this storer then stores sound signal.When recording stand-by time to after microprocessor send a signal to audio collection module stop record.When needing to play recorded audio frequency, microprocessor then sends to audio frequency filtering circuit sound signal, and this sound signal is play by loudspeaker after audio frequency filtering circuit.
As mentioned above, just well the present invention can be implemented.
Claims (5)
1. the Novel recording system based on analog to digital conversion circuit, it is characterized in that, primarily of microprocessor, the storer be connected with microprocessor respectively, analog to digital conversion circuit, audio frequency filtering circuit and timer, the audio collection module be connected with analog to digital conversion circuit, and the loudspeaker be connected with audio frequency filtering circuit forms, described audio collection module is also connected with microprocessor, analog-digital conversion circuit as described is by amplifier P1, amplifier P2, amplifier P3, amplifier P4, triode VT8, one end is connected with the positive pole of amplifier P1, the other end forms the resistance R9 of the input end of this analog to digital conversion circuit, P pole is connected with the output terminal of amplifier P1, the diode D6 that N pole is then connected with the positive pole of amplifier P2, be serially connected in the resistance R11 between the negative pole of amplifier P1 and the N pole of diode D6, positive pole is connected with the N pole of diode D6, the electric capacity C5 of minus earth, N pole is connected with the negative pole of electric capacity C5, the diode D5 that P pole is then connected with the negative pole of amplifier P1 after resistance R10, be serially connected in the resistance R13 between the negative pole of amplifier P2 and output terminal, be serially connected in the resistance R12 between the base stage of triode VT8 and the output terminal of amplifier P4, negative pole is connected with the output terminal of amplifier P2, the electric capacity C6 that positive pole is connected with the positive pole of amplifier P3, N pole is connected with the positive pole of amplifier P4, the diode D7 that P pole is then connected with the positive pole of amplifier P3, one end is connected with the negative pole of amplifier P3, the resistance R14 of other end ground connection, and the resistance R15 be serially connected between the output terminal of amplifier P3 and the negative pole of amplifier P4 forms, grounded collector, its emitter of described triode VT8 are then connected with the positive pole of amplifier P2, the negative pole of described amplifier P4 forms the output terminal of this analog to digital conversion circuit and is connected with microprocessor, the input end of analog-digital conversion circuit as described is connected with audio collection module.
2. a kind of Novel recording system based on analog to digital conversion circuit according to claim 1, is characterized in that: described audio frequency filtering circuit is by differential amplifier circuit, and the suppression circuit be connected with differential amplifier circuit output terminal forms; The input end of described differential amplifier circuit is connected with microprocessor, suppresses the output terminal of circuit to be then connected with loudspeaker.
3. a kind of Novel recording system based on analog to digital conversion circuit according to claim 2, it is characterized in that: described differential amplifier circuit is by triode VT1, triode VT2, triode VT3, the electric capacity C1 that negative pole is connected with the base stage of triode VT1 after resistance R1, positive pole then forms the input end of this differential amplifier circuit, the diode D1 that P pole is connected with the collector of triode VT1, N pole connects+20V voltage, and the potentiometer R2 be serially connected between the emitter of triode VT1 and the base stage of triode VT3 forms; The control end of described potentiometer is connected with suppression circuit; The base stage of described triode VT3 is connected with the collector of triode VT2, its emitter is then connected with suppression circuit, its grounded collector; The emitter of described triode VT2 is connected with the collector of triode VT1, its base stage is then connected with suppression circuit.
4. a kind of Novel recording system based on analog to digital conversion circuit according to claim 3, it is characterized in that: described suppression circuit is by filtering chip U, triode VT4, triode VT5, triode VT6, triode VT7, one end is connected with the N pole of diode D1, the resistance R4 that the other end is then connected with the VDD pin of filtering chip U after resistance R5, positive pole is connected with the tie point of resistance R5 with resistance R4, the electric capacity C2 that negative pole is then connected with the base stage of triode VT2, N pole is connected with the VDD pin of filtering chip U, the diode D2 that P pole is then connected with the base stage of triode VT2, one end is connected with the EN pin of filtering chip U, the resistance R3 that the other end is then connected with the emitter of triode VT3, positive pole is connected with the base stage of triode VT5 after resistance R6, the electric capacity C4 that negative pole is then connected with the collector of triode VT5, N pole is connected with the positive pole of electric capacity C4, the diode D3 that P pole is then connected with the DRV pin of filtering chip U, N pole is connected with the emitter of triode VT5, the diode D4 that P pole is then connected with the emitter of triode VT7 after resistance R7, positive pole is connected with the FB pin of filtering chip U, the electric capacity C3 that negative pole is then connected with the P pole of diode D4, and the resistance R8 be serially connected between the base stage of triode VT7 and collector forms, the TOFF pin of described filtering chip U is connected with the control end of potentiometer R2, its COMP pin is then connected with the emitter of triode VT3, its VSS pin is connected with the base stage of triode VT6, its CS pin is then connected with the base stage of triode VT4, the emitter of described triode VT6 is connected with the negative pole of electric capacity C3, its collector is then connected with the base stage of triode VT7, the collector of described triode VT7 is connected with-20V voltage, the output terminal that the emitter of described triode VT4 is connected with the base stage of triode VT5, its collector then forms this suppression circuit.
5. a kind of Novel recording system based on analog to digital conversion circuit according to claim 4, is characterized in that: described filtering chip U is UCT4392 integrated chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510856064.6A CN105321547A (en) | 2015-11-27 | 2015-11-27 | Novel recording system based on analog/digital conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510856064.6A CN105321547A (en) | 2015-11-27 | 2015-11-27 | Novel recording system based on analog/digital conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105321547A true CN105321547A (en) | 2016-02-10 |
Family
ID=55248781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510856064.6A Pending CN105321547A (en) | 2015-11-27 | 2015-11-27 | Novel recording system based on analog/digital conversion circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105321547A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110037736A (en) * | 2019-04-08 | 2019-07-23 | 深圳市贝斯曼精密仪器有限公司 | A kind of ultrasonic listening circuit with analog-digital conversion function |
| CN110299899A (en) * | 2019-07-18 | 2019-10-01 | 恒大智慧充电科技有限公司 | Signal pickup assembly, method, charging equipment, onboard control device and electric car |
-
2015
- 2015-11-27 CN CN201510856064.6A patent/CN105321547A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110037736A (en) * | 2019-04-08 | 2019-07-23 | 深圳市贝斯曼精密仪器有限公司 | A kind of ultrasonic listening circuit with analog-digital conversion function |
| CN110037736B (en) * | 2019-04-08 | 2023-11-17 | 深圳市贝斯曼精密仪器有限公司 | Ultrasonic detection circuit with analog-to-digital conversion function |
| CN110299899A (en) * | 2019-07-18 | 2019-10-01 | 恒大智慧充电科技有限公司 | Signal pickup assembly, method, charging equipment, onboard control device and electric car |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105321547A (en) | Novel recording system based on analog/digital conversion circuit | |
| CN104967947A (en) | Low-pass filtering amplification audio processing system based on step-down constant current circuit | |
| CN105489238A (en) | Novel recording system | |
| CN105321544A (en) | Analog-digital conversion type novel recording system based on pre-amplification circuit | |
| CN105321545A (en) | Pre-amplification type novel recording system based on audio power amplification circuit | |
| CN105323422A (en) | High-definition image processing system based on coupling circuit | |
| CN106301372A (en) | A kind of high precision image data acquisition stocking system based on low-pass filtering treatment | |
| CN105355231A (en) | Novel recording system based on audio power amplifying circuit | |
| CN105321546A (en) | Novel recording system based on pre-amplification circuit | |
| CN105357416A (en) | High-definition image processing system based on coupled circuit and level conversion circuit | |
| CN106330191A (en) | Signal error correction type image data collection and storage system | |
| CN107680628A (en) | A kind of buffer protection catalog system for electrical teaching | |
| CN209488797U (en) | Sound pick-up | |
| CN106374971A (en) | Pulse regulating type wireless audio data acquisition and storage system | |
| CN105516544A (en) | High-definition image processing system | |
| CN105430235A (en) | High-definition image processing system based on level conversion circuit | |
| CN105516543A (en) | High-definition image processing system based on constant-voltage driving circuit | |
| CN104469611A (en) | Audio processing system for widening range | |
| CN106205667A (en) | A kind of ANTENNAUDIO data acquisition stocking system | |
| CN104700351A (en) | High-precision image processing system based on image coding processing | |
| CN107657972A (en) | A kind of preposition scale-up version recording system of Audio Buffer | |
| CN107886974A (en) | A kind of Audio Buffer recording system | |
| CN107731248A (en) | A kind of power amplification catalog system for electrical teaching based on Audio Buffer | |
| CN106330190A (en) | Error correction type image data collection and storage system based on lowpass filtration | |
| CN107659873A (en) | A kind of preposition amplifying type Audio Buffer recording system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160210 |