Audible vibrations transmitted through air or other medium

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0
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0answers
17 views

Aes/Ebu to Analog Converter IC

I will convert AES/EBU to analog, then monitor it and will convert it again to AES/EBU. Do you have any advice to convert AES/EBU to analog IC and analog to AES/EBU IC.
1
vote
2answers
47 views

Switching between two sine waves using analog circuitry

I'm trying to do a project entirely using analog circuitry. The project involves switching between two sine waves at a constant frequency to power a speaker. I am using a Wien-bridge oscillator to ...
0
votes
1answer
21 views

Simple sound pulse (or frequency) to voltage for switch

I am building a tiny project using an android phone -- it simply has to drive a transistor switch on and off. Instead of going down the route of trying to interface to a micro controller via ...
-4
votes
1answer
49 views

how can i make my own sound emiting personal alarm? [closed]

I'm a jewelry designer who wants to create an attack alarm that looks like jewelry. I'm having trouble finding info online about how one works. Is there anyone here who can help me or teach me how to ...
1
vote
0answers
27 views

Connect electret mics to computer [closed]

I'm trying to do cross correlation on the signals arriving at a microphone pair. I do not want to record anything. Before doing this on a development board (like the beaglebone/board), I decided to ...
-5
votes
1answer
37 views

Understanding the concepts of sounds analysis [closed]

I'm trying to understand many concepts behind sound analysis. Here's what I'm trying to understand: What's sound & sound wave? What's sampling and hertz? And how to do sampling? (starting from ...
2
votes
4answers
289 views

Calculating Wavelength of sound using an Arduino

I'm using an Arduino Uno R3. I need to measure the wavelength of sound of a particular (known) frequency. By substituting in the equation: Vsound = Frequency * Wavelength ...I wish to calculate the ...
1
vote
2answers
69 views

phase shift detection between 2 non-periodic signals

I would like to find the phase shift between two non-periodic signals read from an electret microphone. So what I did so far is the following: read the signals from the mics using an arduino uno ...
1
vote
2answers
85 views

Sound dampening like bose headphones

I'm hearing impaired. I'd like to dampen all the sounds around me filtering out all the stuff I deem unworthy of reaching my ears like the sound of my cars engine, computers fan or the rattling of ...
0
votes
2answers
59 views

Scaling down the sensitivity of an MEMS mic

I'm using an MEMS mic ADMP401, and the datasheet said, that the sensitivity form the chip is -46dbV, my question, how to can the scale it down, mean that I hear only really loud sounds?
1
vote
4answers
156 views

Why use 2 isolated grounds in Mackie 220W Power Supply?

I recently took apart a Mackie 220W power supply for an analog sound board. Much to my surprise I found the following scheme: Earth grounded: 48V -18V 18V Seperate, isolated ground: 12V 5V I am not ...
18
votes
6answers
2k views

Why should I use a logarithmic pot for audio applications?

Just got really curious about it reading this answer from Spehro Pefhany. There Spehro comments that one should use a logarithmic pot for audio applications. So I googled for it. The best I could ...
0
votes
0answers
40 views

Alternative to linear actuator

My application requires that actuator should be such a precise and frequent that would be capable to play sound when attached to some metal plate. Do I need Actuator at all or I should look at ...
0
votes
1answer
150 views

How do I source an Audibly noiseless (< 3dBA) power supply?

This is not a shopping question; this is a "what is the best way to solve this problem" question. To power a medium-size project, I'm looking for a 15W/12V board mount power supply, taking mains AC ...
1
vote
1answer
102 views

Simple melody recognition based on a microcontroller [closed]

Is there a way to implement a simple melody recognition using a hobby-level microcontroller board like Arduino or Tiva Launchpad? By "melody" I mean a sequence of 4-5 clear notes, produced by a ...
1
vote
4answers
126 views

How does electricity represent sound?

I understand that AC electricity can travel through wires to represent sound. But, to be honest, I can't find a good explanation of it. Here are my questions: How exactly is this setup? Does voltage ...
6
votes
2answers
182 views

Where have the 8 bit sound chips gone?

I know it's 2014 and you can get an MP3 player and 40 bazillion terabytes on a microscopic chip. But I want to build a 6502 based retro computer and, in a perfect world, I would order up about 200 ...
1
vote
0answers
46 views

How multiple sounds together is sampled and reproduced? [closed]

I searched and understood up to the point that device samples the input at frequent interval and store that digitally and later that can retrieved and recreated that sampled sound. What I am not able ...
0
votes
1answer
326 views

Playing sounds using WTV020SD mini

I'm a beginner when it comes to electronics. So I want to play sounds using my controller and I am using a WT020-SD-16P I connected the module to my microcrontroller like in the picture. and added ...
3
votes
2answers
88 views

What might cause audible noise in an inductive charging system?

I have a pair of Qi-compatible wireless charging pads, and I've noticed that when a device is charging, the pad will emit a quiet but noticeable squeal in a relatively high frequency range. Perhaps ...
2
votes
2answers
228 views

How to convert Volts in dB SPL

I am taking input from an electret mic amplified using LM358 amplifier from my PIC16F877A's ADC unit. I am getting the readings in Volts from the ADC which ranges from 2.5V to 5V. How can I convert ...
1
vote
3answers
150 views

Detect string plucking in electric bass guitar? [closed]

Anyone knows any idea of how can I detect plucking in a string of a guitar with an arduino (possibly using the pickup signal)? Thanks in advance ! ;)
1
vote
1answer
56 views

Synchronising two microcontrollers for LED sequence and piezo speaker

I am making a piano keyboard which has a subsystem that plays a song whilst lighting up the corresponding notes that are to be played. I have used a PICAXE 20M2 microcontroller for the LED sequence ...
3
votes
2answers
162 views

FFT + filtering sound = triggering signal

I'm trying to FFT the live input sound and filter it to have only 350 to 500 HZ. So, my goal is to turn the LED light on only when some sound has frequency between 350-500. I looked at FFT codes, but ...
6
votes
5answers
734 views

Circuit that measures the speed of sound in concrete

I need a circuit to measure the speed of sound in concrete to 1μs or better. This is for a school demonstration where students who study construction will use this circuit to measure the speed of ...
3
votes
1answer
131 views

Why do library book detectors make my headphones buzz?

Whenever I enter or exit a library while wearing headphones (cheaper intra-aural type), I hear loud buzzing as I pass through the book detector gate. I can vaguely speculate at a high level that ...
0
votes
1answer
143 views

Detecting location of infrasound noise in a building

I am working in a large office building with a lot of people. Pretty frequently there is a very weak and low frequency noise that is very irritating. Unfortunately, I have found just one other person ...
1
vote
1answer
81 views

Humming Sound of UPS vs DSP Inverter

I have a APC 1000VA BR Smart UPS.I have noted that the UPS Produces a Humming Sound when running on Battery Power.But my older a normal 500VA UPS(not from APC) seems to produce far lesser humming.The ...
2
votes
1answer
139 views

Amplified 80dBA 40KHz Sound From 3V Square Wave?

How can a loud high-frequency tone be produced from a 3V square wave? Given that: the square wave is 3V and can have a varying frequency (max 4mA) 12VDC high-current supply is available ...
1
vote
1answer
271 views

How to produce a simple beep/sound without using piezo-buzzer

I am designing a fairly simple board where I need to sound a simple chirp/beep every couple of minutes, however, layout space is extremely limited. Therefore, a full-blown piezo buzzer is a no-go; ...
3
votes
0answers
71 views

Sound measurement settings [closed]

Not sure it's a 100% appropriate forum, but we're having a project at school in which we faff around with noise measurements. The problem is we haven't really been given proper instructions on how to ...
2
votes
4answers
91 views

Generating sound with VCO

I have an extremely basic electronics experience (op amps, filters...not much past that) and need to generate sound from a varying voltage voltage signal. I simply want it to increase in ...
0
votes
2answers
314 views

Simple Ray gun sound - buzzer

I am trying to put together a ray gun wrist gauntlet for my son's Buzz Lightyear Halloween costume. I think am going to do a little circuit with a big red LED and a 555 timer to make it flash (maybe a ...
5
votes
3answers
195 views

How are loudspeakers able to play many different sounds at the same time?

I know this is kind of a lame question, but I wanted to know how loudspeakers are able to play so many different sounds at the same time. Like, in a song we can hear the voice of the singer and all ...
0
votes
0answers
165 views

Use Dell Laptop internal speakers with Raspberry Pi

I have some speakers from an old Dell Latitude D600 that I and a friend took apart (his brother had managed to fry the motherboard?!!?) and so we salvaged some parts, one of which is the speakers. ...
1
vote
1answer
78 views

Sensing signal from computer > triggering a MCU

I am to develop a system that senses an alert from a software running on the computer and triggered the MCU In more detail, there is a program that is running on the computer that alerts the person ...
0
votes
2answers
122 views

Sound when sensor leaves proximity

I am trying to play a sound when two devices are more than a certain distance apart, say 30ft. Some notes: The device this is for is very small, about the size of a large keychain I would like a ...
0
votes
1answer
85 views

Proximity Sensor [closed]

I am trying to make a circuit that as an object moves closer to a proximity sensor it triggers a dimmer switch controlling a light and amplifier for loudspeakers. Basically as an object moves closer ...
0
votes
1answer
78 views

Why to multiply all audio input with 1000/sqrt(sumsofInputSquare/datalength) [closed]

My thesis is about voice segeration. I am reading a code which has been used in this field. It most probably not needed but here is the fullCode I can't understand something which owner code did , ...
-2
votes
2answers
116 views

How does a digital sound card's electric circuit make different pitches, etc. measured in just electrons? [closed]

I was wondering how hardware engineers, electrical engineers, or any and all inbetween design a circuit diagram for something that measures pitches, tones, etc. all in the form of bits/bytes and ...
2
votes
1answer
114 views

How can I create the characteristic warp core sound?

I'm trying to build a miniature warp core (purely decorative, not functional) with the main element being an LED chaser circuit with 10 LEDs. I'm planning on using a 555 timer and a 4017 decade ...
2
votes
2answers
728 views

Small piezo buzzer with low voltage, low current

I am designing a board which communicate wirelessly with a smart phone. When I send a specific command, I want it to sound an alarm to the user, making it able to be found when lost. My board runs on ...
4
votes
1answer
185 views

Music through RF

I have recently been fascinated with wireless-ness. I thought of a little project so I could do a little research in this area. This project uses a circuit board found in a Christmas card or birthday ...
1
vote
1answer
60 views

Microphone time delay estimation

I'm trying to estimate the direction of arrival of sound using a microphone array. This requires me to find the delay of the sound signal upon arriving the different microphones. For convenience, I ...
1
vote
3answers
252 views

How many harmonics are needed to produce a proper square/saw/triangle/etc wave?

I'm new to software sound synthesis, but I have a question that I can't seem to find the answer to. I understand that, for example, a square wave at 100 Hz has its third harmonic at 300 Hz with 1/3 ...
2
votes
4answers
241 views

Detection of weak periodical sound signal having negative SNR (will lock-in-amplifier be useful)

I'm trying to understand whether it is possible to detect human's heartbeat from a distance. I'm not a specialist, but it seems to me that the following issues must be addressed: Very sensitive ...
2
votes
1answer
208 views

How to turn analog audio into AM/FM signal for radio receiver?

Because I have several good (but older) sound systems in my apartment I am looking for a way to play audio from an iPhone or computer (anything with a headphone jack) synchronously on all of them. All ...
1
vote
1answer
184 views

Line level voltage to drive LED display

EDIT: Please read the whole post before automatically down voting. I KNOW the diagram is crap. That is what I am asking about. It isn't my diagram. Original post: I Web searched a bit and ...
0
votes
1answer
105 views

Electronic component which produces a clear clicking sound

A surprisingly hard thing to search for as most references are to defects with other components. Are there any such devices mass produced? or any good alternatives. I've considered over-driving a ...
4
votes
2answers
449 views

Is there any way to differentiate the sound of blowing air from normal sound through phone microphone?

I have been working on an Android app that takes input from microphone when user blows into it. I am using FFT based sound analysis and converting the values in frequency by using a zero crossing ...