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59 Threads found on Microphone Noise
waqas5304, I see 2 potential causes. When the microphone is unplugged, the IA provides a very high impedance to the outside world 60 Megohms), making it very susceptible to capacitively coupled noise pickup. You can solve this problem by connecting resistors from both differential inputs to signal ground. These ristors can be high compared to t
First of all, I must admit that my knowledge on opamp is very limited. Would someone pls advise what are the functions of IC1A and IC1B in the circuit? How do we relate the sound -> microphone ->
As a start, instead of dealing with the complexity of a microphone feeding a transformer which feeds an amp, why not say that any complex network can be modeled with a voltage source and a series resistance? If you say this, then you could analyze a simple voltage divider circuit, which is what power transfer is after all. Next, if you want a
Probably you need a system similar to biomedical systems. You need a microphone instead of electrodes and follow it up with preamp. This must be followed by filters to filter out unwanted frequency components. For this you need to know the exact frequency pattern of the termites. Finally you need a simple event detector like a comparator.
Hi, Need to convert my electrect PC desk microphone into a directional electrect PC desk microphone in order to reduce pickup of enviroment noise like PC PSU and or PC CPU fan, street noise and so on. If possible with automatic level control (compressor/limiter). This mic will be used in a HAM 80m SSB station. (...)
Hi all, I need a schematic of a MFJ-655 hamProAudio Equalizer / Conditioner like desktop mic. It must not have graphic equalizer, universal microphone interfacing, impedance matching, level control and even a low noise preamp, this is all easy to implement but the rest ... Downward Expansion noise gate, clean Compressor and smooth (...)
Hey everyone, I'm new to this forum. I am working with a group of Virginia Tech EE undergraduate students doing our senior project. We are designing a digital controller for noise canceling headphones. We have a pair of headphones equipped with an internal microphone. We've done initial testing of our system, and designed our controller. The tra
You question is vague. Quality and pattern of microphone, eg directional microphone to reduce pickup of background noise. Quality of codec. Bit rate
I am looking for references on how to calculate SNR, THD?.. for audio applications. For example, if one wants to find the SNR of a condenser microphone what does he/she consider as noise? Does noise include the distortion caused by the non-linearity of the condenser or is noise the floor when no input is applied. I am asking (...)
Mic - do you mean microphone? When talking about audio equipment, "line level" usually means 700mV RMS for 0 dB level. A microphone outputs a much smaller signal, usually a few millivolts.
One example is for a high impedance sensor such as a piezoelectric microphone. Putting this to a source follower which is driving a 100 ohm load causes more signal power in the load than is out of the microphone. (p=v*v/r)
when we use microphones usually we receive noise sometimes, in the sense we feel a high pitch disturbing sound coming out of it sometimes. This even happens only if we stand at particular places with it. What is the reason for that?
Hi , I need to design a microphone preamp circuit using CMOS technology. Anyone knows what is the detailed spec. for microphone , that means , does the preamp need very low noise or high gain ?
Hi, This may be the ambigious project. I want to make my room completed with the Audio Cancelation circuit. The aim is to keep the room quit from the sound or noise from outside room (from door or windows). The idea is to put the microphone to sense the audio (noise), and then use the Microcontroller or DSP to make the opposite wave (...)
I work 2 years in small company that developed microphones for some special application, mostly - security. I check a lot of them, include number of sound concentrators. 1. Resonance tube concentrator will not work for high frequencies (more than 15 kHz), because holes between tubes will be re- sonators too and this increase background
which cap has the lowest noise at 0.22-1uF? I am using a X7R and it picks up a lot of noise when I use it couple ac signal for inverting amplifier. Found that out after a lot of probing. If I remove the cap and leave it hanging, no noise at all. What cap should I use? this is for pre-amp for electret microphone. (...)
Try to be more specific. Maybe upload the schematics of the input stage. What kind of microphone you are using (dynamic)? What is input impedance of prestage?
Maybe You can use LINE-IN instead of microphone in Your soundcard ? With responce, Kit-the-great
Low-noise microphone Amplifier The signal from a microphone is too weak for a standard line input. This low-noise DC-coupled microphone amplifier provides a solution for anyone who wants to connect a microphone to his or her hi-fi installation.

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