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59 Threads found on Microphone Noise
Okay, so here is my current circuit: values that are not given are either irrelevant or not present on the actual board. I shorted the mic to ground to see what noise the circuit itself is generating which proved to be just about undetectable on my scope. Removing the short revealed the 'noise
Hi can anyone pls explain to me what equivalent input referred noise is. I found this "A microphone converts acoustical energy to electrical energy. microphones have some level of electrical noise at their output. This noise may have contributions from random diaphragm movement, thermal (...)
The same concept is also applied to the microphone wrapped in parabolic dishes that are able to hear weak audible sources from far away, and with the advantage of being less subjected to the surrounding noise.
If the microphone can hear the speaker then you will have acoustical feedback howling. Start with the microphone. Is it an electret type that has a Jfet inside and it needs to be powered or is it a dynamic type with a coil and magnet like a small speaker? The mic needs a low noise preamp. An LM386 is not low noise and is not (...)
There is a large common mode noise generated with floating SMPS that can be problematic for unbalanced sensitive circuits. e.g. external microphone inputs on laptops. Although primary side grounding reduces conducted noise getting back into the line, there is always a coupling capacitance from primary to secondary coil. When no secondary (...)
I'm an expert in falling down but not sky diving. I have experienced similar problems with mobile ham radio on a motorcycle where the engine and road noise operated the vox circuit. The best solution is vox with a throat microphone, one that sits inside a loose fitting elastic collar. It goes under clothing so the wind rush doesn't reach it and bei
" Arduino type microphones ", Surely an Aduino is a microprocessor and has nothing to do with microphones. If you use an Electret type mic (Google "electret"), with a BC548 pre-amp (gain X 10) then any OP amp with a gain of 500X. You will get volts of good audio. To measure its amplitude, it has to be turned into DC and displayed on some device. I
Your attachments are almost completely hidden since they have faint green text to their links. Please post the actual documents HERE. You show a fairly noisy video buffer amplifier with no voltage gain, not a low noise microphone preamp with plenty of voltage gain. You did not describe the noise caused by the circuit. Low frequency hum or (...)
Hello, I would like to connect audio signal from pc sound card to SIM900 GSM module. I am using simple breakout board from Itead studio, I connected the grounds together and signal form sound card to board input. Only thing that I can hear is noise. If I connect microphone I am able to hear sound. Can somebody help me connect sound to [URL="ftp://i
Hi All, I need some advice if possible on how to make the first investigations on a system for noise cancellation/ noise removal. My plan is to place a speaker and a microphone (standard speaker/mike, low cost, non callibrated type) in a room, connect it to a PC audiocard and test if it can attenuate the sound level in the room, being (...)
Hello everyone, I'm using dspic33fj128gp802 to background noise cancellation project. What i did was i'm taking the input from a microphone(headphone mic) as my input(In) and I'm giving my desire input by delaying some miliseconds then i have built a neural network using weights and updating weights. I tried this using simulink in matlab and it
I am working on a project to take an input signal from a microphone and turn on leds depending on the noise intensity. This is my first time using this microprocessor and I was wondering if anyone knew of a good sample code I could reference for this. Any help would be appreciated
hey friends, i'm doing noise suppression and communication project. what i basically doing is I'm going take the speech from the microphone that in headphone. and i have another mic and i'm taking background noise from that. Then i'm giving that noise and voice to dsPIC30f4011. i want know how i detect sound coming from the (...)
When dealing with very weak signals, e.g. in a microphone preamp, using a low noise transistor helps to minimize the noise added to the signal. noise in audio signals sounds like hiss - it's what you hear from an FM radio when it's tuned between stations (or to a very weak station).
Hi All, I am new around here. I using frost beam former matlab code as part of phased tool box. I have conducted an experiment with microphone array of 8, spacing of 3cm with noise and signal . The steering direction is 0 degrees . The noise is 90 degrees to the array. Due to the fact
i need a miniature microphone my application. going to use along with two miniature speakers in a ear probe. the self noise should be less than 5dB. please recommend any product with this specification I dont know why, but I have feeling that you are student with some big exams in near future. :grin:
1)Should the Mic be powered in order to work or not?? 2)With 10K resistor and 9V,the mic can only draw 1mA of it enough for it to work?? Both times, clearly yes. 0.5 mA is a typical current consumption. The mic doesn't draw any current Obviously, the schematic refers to an electrete microphone with b
You need a noise cancelling mic on phone, -external hands-free mic/earbuds with noise cancelling mic (double sided) is best bet. Test for quality. cheapest one I found just now..
If I understand your intention right, I don't expect, that mixing/adding the microphone signals from multiple rooms and locations serves the purpose. It will reduce overall signal-to-noise ratio by a considerable factor and possibly causing failure of a system, that works well with a single microphone. For reliable operation, you would (...)
try a new microphone. You may have a break in the ground shield wiring.