CN1892873A - Circuit for eliminating running noise of motor of portable multi-media playing apparatus - Google Patents
Circuit for eliminating running noise of motor of portable multi-media playing apparatus Download PDFInfo
- Publication number
- CN1892873A CN1892873A CN 200510080707 CN200510080707A CN1892873A CN 1892873 A CN1892873 A CN 1892873A CN 200510080707 CN200510080707 CN 200510080707 CN 200510080707 A CN200510080707 A CN 200510080707A CN 1892873 A CN1892873 A CN 1892873A
- Authority
- CN
- China
- Prior art keywords
- sound
- motor
- circuit
- playing apparatus
- media playing
- 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
Images
Abstract
The disclosed circuit for eliminating noise of running electrical motor includes following parts: a first sound sensor is in use for inductive measuring first sound signal generated when electrical motor is running, and second sound signal inputted to the portable multimedia player; receiving the first sound signal and the second sound signal, the unit of eliminating noise carries out a comparison operation in order to eliminate the first sound signal, and output the second sound signal. Using two sound sensors to obtain inputted sound signal and signal of noise source, the invention eliminates the signal of noise source from the inputted sound signal. Through architecture of circuit in low cost and simple, the invention eliminates noise of resonance generated from running motor so as to raise quality of recording sound of portable multimedia player.
Description
Technical field
The present invention relates to a kind of noise suicide circuit, particularly a kind of portable multi-media playing apparatus (Portable Multimedia Player, circuit for eliminating running noise of motor PMP).
Background technology
Arriving along with multimedia era, the user can enjoy the multimedia recreation effect whenever and wherever possible by portable multi-media playing apparatus, and portable multi-media playing apparatus, store the multimedia file data by micro hard disk, the micro hard disk device is when running, its drive motor produces vibrations because of running, and then trigger noise problem, therefore in the process of portable multi-media playing apparatus recorded voice, tend to vibrating noise is recorded in the lump, thus the recording quality of reduction portable multi-media playing apparatus.
No. 446258 novel patent disclosure of Taiwan patent announcement a kind of earphone of eliminating environmental noise, it utilizes a near microphone that is arranged at the earphone horn to collect near the interior noise of environment (as the ear chamber), produce the sound wave of an inverted phases (180 °) by a circuit, cancel out each other with original noise sound wave, make in specific environment (as the ear chamber), the balance that keep-ups pressure reaches the purpose that abates the noise.
No. 535967 novel patent disclosure of Taiwan patent announcement the mobile phone communication noise absorber in a kind of car, comprise a sensor that is installed in a noise source side of this vehicle, one with electrical in succession the analog/digital signal conversion device of this sensor, one digital signal processor that is electrically connected with this analog/digital converter, the one digital/analog signal converter that is electrically connected with this digital signal processor, an and audio producing unit that is electrically connected with this digital/analog signal converter, after this audio producing unit receives the analogue audio frequency processing signals that this digital/analog signal converter transmitted, can send out one equates with the noise level of this noise source, the audio frequency that phase place is opposite, in this way, but the noise that utilizes this this noise source of audio frequency interference eliminated to be sent, the radio reception quality of this action phone when improving communication.
Though can improving, listens to and the radio reception quality above-mentioned noise suicide circuit, but its employed digital operation device, compensating circuit or digital signal processor, analog/digital converter and digital/analog converter are the not low circuit unit of price, so the cost of noise suicide circuit will be risen.
How therefore a kind of circuit for eliminating running noise of motor of low cost and portable formula multimedia playing apparatus be provided,, become one of researchist's problem to be solved to promote the recording quality of portable multi-media playing apparatus.
Summary of the invention
In view of above problem, fundamental purpose of the present invention is to provide a kind of circuit for eliminating running noise of motor of portable multi-media playing apparatus, by obtaining the voice signal of motor rotation, running noise of motor in the Recording Process is eliminated, comprise running noise of motor in the sound of avoiding being recorded, promote the recording quality of portable multi-media playing apparatus.
For achieving the above object, the invention provides a kind of circuit for eliminating running noise of motor of portable multi-media playing apparatus, comprising:
One first sound transducer, a second sound signal of one first voice signal that produces during the described motor rotation of measurement of inductance and the described portable multi-media playing apparatus of input, described first voice signal is combined in the described second sound signal when recording;
One second sound sound sensor, described first voice signal that produces during the described motor rotation of measurement of inductance; And
One noise eliminating unit, receive described first voice signal and second sound signal that described first sound transducer and second sound sound sensor institute measurement of inductance arrive respectively, and carry out a comparison operation, eliminate described first voice signal and export described second sound signal.
The circuit for eliminating running noise of motor of above-mentioned portable multi-media playing apparatus is characterized in that, also includes the sound recording unit, is used to record the second sound signal by the output of noise eliminating unit.
The circuit for eliminating running noise of motor of portable multi-media playing apparatus of the present invention, obtain the voice signal and the noise source signal of input respectively by at least two sound transducers, again the noise source signal is eliminated in the voice signal of input, so, by simple and easy and circuit framework cheaply, eliminate the resonance noise that produces by motor rotation, promoted the recording quality of portable multi-media playing apparatus.
Description of drawings
Fig. 1 is the system block diagrams of noise eliminating of the present invention;
Fig. 2 A and Fig. 2 B are the circuit diagram of differential amplifier of the present invention; And
Fig. 3 is the diagrammatic cross-section of portable multi-media playing apparatus sound transducer of the present invention position.
Wherein, Reference numeral:
10 first sound transducers
11 second sound sound sensors
12 noise eliminating unit
13 sound recording unit
20 motors
21 first voice signals
22 second sound signals
30 casings
The 30a MIC
The Iss current source
The Q1 transistor
The Q2 transistor
The Q3 mos field effect transistor
The Q4 mos field effect transistor
R1～R3 resistance
The V1 input end
The V2 input end
The Vo output terminal
The VCC positive voltage source
The VEE negative voltage source
Embodiment
As shown in Figure 1, the system block diagrams for noise eliminating of the present invention includes: first sound transducer 10, second sound sound sensor 11 and noise eliminating unit 12 and motor 20.
Second sound sound sensor 11, be arranged in the portable multi-media playing apparatus, the vibrating noise (first voice signal 21) that is produced when being used for measurement of inductance by motor 20 runnings, wherein second sound sound sensor 11 can be made of Electret Condencer Microphone, dynamic microphones or silicon crystal microphone etc.
Motor 20 is arranged in the portable multi-media playing apparatus, is used to provide Storage Media (as micro hard disk) running required power.
Fig. 2 A is the circuit diagram of differential amplifier, includes: resistance R 1, resistance R 2, resistance R 3, transistor Q1, transistor Q2 and current source Iss.
At first, with first sound transducer, 10 measurement of inductances to first voice signal 21 input to input end V1 with second sound signal 22, and input end V1 is connected to the base stage of transistor Q1, next, with second sound sound sensor 11 measurement of inductances to first voice signal 21 input to input end V2, and input end V2 is connected to the base stage of transistor Q2, the collection utmost point of transistor Q1 is connected to an end of resistance R 1, and the other end of resistance R 1 is connected to positive voltage source VCC, the emitter-base bandgap grading of transistor Q1 is connected to the end of current source Iss, and the other end of current source Iss is connected to negative voltage source, resistance R 3 is connected in parallel with current source Iss, the collection utmost point of transistor Q2 is connected to an end of resistance R 2, and the other end of resistance R 2 is connected to positive voltage source VCC, the emitter-base bandgap grading of transistor Q2 is connected to the end of current source Iss, and the other end of current source Iss is connected to negative voltage source.
After the comparison operation by differential amplifier, output end vo amplifies output second sound signal 22, and output end vo is connected with sound recording unit 13, to record second sound signal 22, in addition, shown in Fig. 2 B, circuit diagram for another embodiment of differential amplifier of the present invention, be transistor Q1 and transistor Q2 are replaced into mos field effect transistor Q3 and mos field effect transistor Q4 with the difference of Fig. 2 A, all the other are partly identical, are not giving unnecessary details.
As shown in Figure 2, diagrammatic cross-section for sound transducer of the present invention position, wherein first sound transducer 10 and the 11 adjacent settings of second sound sound sensor, place at casing 30 offers MIC 30a, be used to provide first voice signal 21 of first sound transducer, 10 measurement of inductance external environments input, in the process of recording, motor 20 runnings shake and make casing 30 produce resonance, and then produce first voice signal 21, and second sound sound sensor 11 is used for measurement of inductance second sound signal 21, there is not the MIC of offering 30a in the position of second sound sound sensor 11, with first voice signal 21 of complete measurement of inductance by motor 20 and casing 30 resonance.
Circuit for eliminating running noise of motor by this portable multi-media playing apparatus, obtain the voice signal and the noise source signal of input respectively by at least two sound transducers, again the noise source signal is eliminated from the voice signal of input, so, by simple and easy and circuit framework cheaply, the resonance noise that elimination is produced by motor rotation, and promoted the recording quality of portable multi-media playing apparatus.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (11)
1, a kind of circuit for eliminating running noise of motor of portable multi-media playing apparatus is characterized in that, comprising:
One first sound transducer, a second sound signal of one first voice signal that produces during the described motor rotation of measurement of inductance and the described portable multi-media playing apparatus of input, described first voice signal is combined in the described second sound signal when recording;
One second sound sound sensor, described first voice signal that produces during the described motor rotation of measurement of inductance; And
One noise eliminating unit, receive described first voice signal and second sound signal that described first sound transducer and second sound sound sensor institute measurement of inductance arrive respectively, and carry out a comparison operation, eliminate described first voice signal and export described second sound signal.
2, the circuit for eliminating running noise of motor of portable multi-media playing apparatus according to claim 1 is characterized in that, described first sound transducer is an Electret Condencer Microphone.
3, the circuit for eliminating running noise of motor of portable multi-media playing apparatus according to claim 1 is characterized in that, described first sound transducer is a dynamic microphones.
4, the circuit for eliminating running noise of motor of portable multi-media playing apparatus according to claim 1 is characterized in that, described first sound transducer is a silicon crystal microphone.
5, the circuit for eliminating running noise of motor of portable multi-media playing apparatus according to claim 1 is characterized in that, described second sound sound sensor is an Electret Condencer Microphone.
6, the circuit for eliminating running noise of motor of portable multi-media playing apparatus according to claim 1 is characterized in that, described second sound sound sensor is a dynamic microphones.
7, the circuit for eliminating running noise of motor of portable multi-media playing apparatus according to claim 1 is characterized in that, described second sound sound sensor is a silicon crystal microphone.
8, the circuit for eliminating running noise of motor of portable multi-media playing apparatus according to claim 1 is characterized in that, described noise eliminating unit is a differential amplifier.
9, the circuit for eliminating running noise of motor of portable multi-media playing apparatus according to claim 8 is characterized in that, the described first sound signal sensing device is connected to the inverting input of described differential amplifier.
10, the circuit for eliminating running noise of motor of portable multi-media playing apparatus according to claim 8 is characterized in that, described second sound signal sensor is connected to the only phase input end of described differential amplifier.
11, the circuit for eliminating running noise of motor of portable multi-media playing apparatus according to claim 1 is characterized in that, also comprises a sound recording unit, is used to record the described second sound signal of described noise eliminating unit output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510080707 CN1892873A (en) | 2005-07-05 | 2005-07-05 | Circuit for eliminating running noise of motor of portable multi-media playing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510080707 CN1892873A (en) | 2005-07-05 | 2005-07-05 | Circuit for eliminating running noise of motor of portable multi-media playing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1892873A true CN1892873A (en) | 2007-01-10 |
Family
ID=37597626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510080707 Pending CN1892873A (en) | 2005-07-05 | 2005-07-05 | Circuit for eliminating running noise of motor of portable multi-media playing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1892873A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106029500A (en) * | 2015-03-31 | 2016-10-12 | 深圳市大疆创新科技有限公司 | Flight system, aircraft, sound apparatus and sound processing method |
| CN108800476A (en) * | 2018-06-20 | 2018-11-13 | 广东美的制冷设备有限公司 | The detection device of environmental noise and the control method of air-conditioning, device and system |
| CN109059210A (en) * | 2018-06-20 | 2018-12-21 | 广东美的制冷设备有限公司 | Control the device and method and air conditioner of air conditioner rotation speed of fan |
| CN111385709A (en) * | 2018-12-27 | 2020-07-07 | 鸿富锦精密电子(郑州)有限公司 | Electronic device and noise elimination method |
-
2005
- 2005-07-05 CN CN 200510080707 patent/CN1892873A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106029500A (en) * | 2015-03-31 | 2016-10-12 | 深圳市大疆创新科技有限公司 | Flight system, aircraft, sound apparatus and sound processing method |
| CN108800476A (en) * | 2018-06-20 | 2018-11-13 | 广东美的制冷设备有限公司 | The detection device of environmental noise and the control method of air-conditioning, device and system |
| CN109059210A (en) * | 2018-06-20 | 2018-12-21 | 广东美的制冷设备有限公司 | Control the device and method and air conditioner of air conditioner rotation speed of fan |
| CN111385709A (en) * | 2018-12-27 | 2020-07-07 | 鸿富锦精密电子(郑州)有限公司 | Electronic device and noise elimination method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102314871B (en) | De-noising method and de-noising device for mechanical noise of microphone | |
| US9976713B2 (en) | Apparatus and method for providing a frequency response for audio signals | |
| CN1168350C (en) | Digital electroacoustic transducer | |
| CN106126181A (en) | A kind of screen sounding controller, method and terminal | |
| US20150010173A1 (en) | Apparatus and method for providing a frequency response for audio signals | |
| CN1602116A (en) | Microphone apparatus, noise reduction method and recording apparatus | |
| JP2011013403A (en) | Ambient noise removal device | |
| CN101924973A (en) | Signal processing apparatus and signal processing method for loudspeaker motional feedback | |
| US11190869B1 (en) | Phantom powered FET circuit for audio application | |
| CN1805278A (en) | Method and apparatus to record a signal using a beam forming algorithm | |
| CN1956599A (en) | Speaker | |
| CN1892873A (en) | Circuit for eliminating running noise of motor of portable multi-media playing apparatus | |
| CA2760220A1 (en) | Apparatus, systems and methods for controlling an electronic device using an accessory | |
| US20130044901A1 (en) | Microphone arrays and microphone array establishing methods | |
| US20070041588A1 (en) | Motor operation noise elimination circuit of portable multimedia player | |
| CN105872909B (en) | A kind of method and device for realizing Audio Signal Processing | |
| CN201323620Y (en) | Movable network camera and noise eliminating circuit thereof | |
| CN1968010A (en) | Apparatus and method to control volume of received sound signals | |
| CN101902675B (en) | Thin speaker capable of strengthening bass/mega bass sound effect | |
| CN101998199A (en) | Earphone | |
| CN1691702A (en) | Noise cancellation apparatus, method, and electronic communication device using noise cancellation apparatus | |
| CN1545822A (en) | Microphone | |
| CN1878429A (en) | Earphone apparatus integrated microphone | |
| CN209882018U (en) | Novel noise-reducing earphone line control board | |
| CN217788019U (en) | Sound pickup device and stringed instrument |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |