Audible vibrations transmitted through air or other medium

learn more… | top users | synonyms

0
votes
2answers
43 views

Ratio of two RMS values in recorded audio

Hey guys quick(ish) question: I produce music and am having a discussion on the difference between two RMS values in a specific record (Nero-- The Thrill (Porter Robinson Remix)). In the verse, the ...
0
votes
2answers
89 views

Circuit that could replace DSO [closed]

Currently I have a Pipeline leakage detection system the concept is that we are using a striker to strike the pipe at the generator side and receive the sound waves at the receiver side both separated ...
0
votes
0answers
33 views

Designnig a Simple Ultrasonic Phased array system

I want to design a Phased array Ultrasonic System, I want to detect pipeline leakage in the PVC pipes so I am going to keep the Array in contact with the pipe, I have retrieved the Tx and Rx from the ...
0
votes
0answers
15 views

Are there any sound design guidelines for high-loudness piezoelectric sirens?

This is a somewhat tricky question so if the title is not clear please correct it. I have disassembled a siren used for auto and home alarm. It was originally driven by a digital circuit with lots of ...
0
votes
0answers
29 views

Conversion of dBFS value to dBSPL value

Can anyone please help me on that how can I convert my dBFS value of speech signal to dBSPL value in Matlab? Should I use a SPL meter instead of using Matlab? thanks
0
votes
4answers
87 views

Frequency to dB

As I understand for a sound wave the intensity is determined by the amplitude, frequency and properties of the space, but for amplifiers I have seen that the gain is expressed in dB and is a function ...
0
votes
4answers
111 views

how much energy is required to create a sound with constant frequency and amplitude?

Ok, this is a theoretical question, (Forgive my poor English, I am not a native speaker). Lets assume that I have a power-source with p unknown. this power-source provides energy to a speaker to ...
1
vote
1answer
92 views

What is the best way to play music through speakers

I have these speakers I recovered from an old iPod dock. I want to hook these up to a big remote control truck I have but I have never worked with playing music. What is the easiest way to get ...
5
votes
4answers
728 views

Audio signal trying to go back to zero zeroes

I created a two differrent signals on my android phone, one to act as the clock signal (lower signal), and the other to be the data signal (lower signal), but the problem is that the audio the signal ...
1
vote
1answer
29 views

ASP solution for sound enhancement [closed]

I built a stereo speaker and to an extent it sounds good. But I noticed, by changing the EQ to "Rock" genre in my MP3 player, the instrument clarity became more clear and vocals were more fuller, ...
-2
votes
1answer
46 views

What could cause sound system to occasionally become weak and mono until clicking 'Test' in Windows? [closed]

edit I am not looking for a repair, I am trying to learn about what could cause the strange behavior simply for the sake of science. Ok so I have an old Yamaha sound system that is mostly broken ...
3
votes
2answers
185 views

Creating a loud cracking sound to scare cats away forever and ever

So we have some hardcore cats in our area, recording their glorious conquests with excrement. They don't scare easily. I'll be conducting psychological warfare, they must start associating some form ...
0
votes
2answers
73 views

Possible to imitate a wolf's howling with a simple electronic circuit?

I would love to build a small circuit board that outputs something that sounds similar to a wolf howl to a small speaker. With "simple", I mean I would prefer if I could use simple components such as ...
5
votes
1answer
161 views

Custom WAVE file results in different sound profile than created

My problem is as following: I'm trying to use my sound card to produce a custom repeating wave pattern which I will use in some laboratory test setup. My curve is based on a combination of a couple ...
1
vote
2answers
109 views

What is the simplest sound-reacting led circuit?

A few years ago (around 3 years) I've made a very basic circuit to make a led blink to the sound. The circuit a single regulator connected to a USB port to extract 5V, with a 3.3V led, conected to a ...
6
votes
5answers
2k views

Can computer speakers emit ultrasound?

Can computer speakers emit ultrasound? What is the maximum frequency that computer speakers can produce?
5
votes
2answers
286 views

Limits of my Arduino <-> Smartphone communication

I want to transfer signals from my smartphone to my Arduino Uno by using the audio jack. I have directly connected one channel of the audio to the analog in on the board. The smartphone is sending ~ ...
0
votes
2answers
110 views

How to create this opamp circuit for mind machine

I'm trying to create a circuit to blink lights at the precise frequency for a mind machine. The lights need to be in sync with audio. Audio channel 1 300 hz Audio channel 2 310 hz The led needs to ...
0
votes
4answers
120 views

Sound Chips for attiny [closed]

Is there some kind of chip ( that doesnt use an SD Card ) so i can play prerecorded sounds using my ATtiny? I'm talking about the kinds of things in toys like Zoomer and furby etc
5
votes
1answer
349 views

FFT Beat Detection Circuit

I have for over a year now tried to figure out both the electronic aspect and the software aspect of my project. I have somewhat successfully managed to make the overall idea to work, the bumps I ...
1
vote
1answer
58 views

Voltage at netbook's earphones output. [closed]

Is there any standrad that specifies max voltage at earphones output in netbooks? What values can I expect, can it be 5V or rather 1,8V ? Is there any way to monitor current (current I mean adjective, ...
2
votes
1answer
47 views

Switching tone on and off at 120 bpm not working

I am trying to make a design that toggles a sound at a rate of 120 BPM (once every .5 seconds), and I am using a 50 MHz clock. Here's the tone module: ...
2
votes
2answers
412 views

Capacitor/resistor effect on audio signal

I have a pair of 20 years old electrostatic speakers that have an analog first order high-pass filter before the electrostatic panels, so there is a capacitor in the audio signal path. The original ...
0
votes
0answers
93 views

Electret Mic Capsule to Piezoelectric Disk

I'm working on a project that involves creating units/cells that "listen" and "talk" to each other. The principle being the circuitry I've tried is to use an Electret MIC Capsule to pick up sound, ...
1
vote
1answer
131 views

Stereo heaphone doesn't work properly when the balance is centered [closed]

I have an old headphone (Philips SHP1900) and it used to work fine, until the day which I accidentally stepped on it... Since then, when I listen to music, the instruments sound really loud and the ...
0
votes
0answers
227 views

ADC input to raspberry pi - I2C vs I2S

I'm trying to create a microphone array and take readings into a raspberry pi. I'm having an 8 bit ADC connected to the pi via I2C (SCL and SDA pins). I'm able to read samples (0-255) into my pi using ...
0
votes
0answers
225 views

How can I output sound using my BeagleBone Black without the audio cape?

Is the problem that the analog output doesn't give up to 22kHz, and thus cannot output good quality sound? What capabilities are needed to output sound to a small speaker from an analog output pin, ...
0
votes
0answers
100 views

Non line-of-sight distance sensor

I am working on a project and need help with one of the systems. I have a car (4 feet by 5 feet) that starts off at a docking station and without user input moves around a driveway. One of my ...
0
votes
2answers
474 views

What is the impedance of audio output of cell phones [closed]

What is the impedance of audio output in cell phone. I mean 3.5 jack for headphones. Is that somehow standardized? Do we know ranges among cellphones? Or mp3 players. I haven't found any information ...
1
vote
1answer
57 views

Converting analog stereo to digital stereo

Analog stereo has two channels. One for every speaker. Now, when can sample and convert the two streams of data from analog to digital. But the problem, is what we will have is two streams of digital ...
0
votes
0answers
106 views

Can a PC sound card (realtek) be used to transmit radio signals

If I were to use software such as PureData to generate a 20 KHz sine wave and perform AM on the wave, played it out the line-out on the right channel, with the ground and the left channel sent to a ...
1
vote
1answer
85 views

Why does this circuit oscillate and produce sound?

I've connected an 8-ohm speaker in series with coil. When I apply 5 volts / 500 mA to the combination (coil and speaker), I heard a very high frequency sound (something like whistling). The coil is ...
0
votes
1answer
46 views

Architecture of speaker (drivers) to get an acceptable level with small dimensions

I'm trying for a couple of days now how to get a good volume out of a small speaker. My reference is e.g. an iPhone internal speaker which has a good loudness (up do 100dB) in the higher and middle ...
2
votes
5answers
197 views

Speakers as microphone

I've seen this following post regarding using the speakers as a microphone: http://skeptics.stackexchange.com/questions/5664/can-a-computer-be-hacked-to-use-a-connected-speaker-as-a-microphone There ...
0
votes
2answers
57 views

Getting the maximum range of a mic

I've asked yesterday a question about choosing a mic, and I conclude that I need a mic that can "hear" a sound louder than 160SPL , after Googling and reading wikis about mics, I still can't find a ...
-1
votes
2answers
68 views

how to choose a mic and make sure not to overcahrge it [closed]

I'm not sure that's the right forum to ask this question but I'll do it anyway . in my project, I've to listen to different machines using an MEMS mic by fixing the mic directly on the machine , the ...
0
votes
1answer
93 views

What device would be the best for producing the loudest beep possible with the smallest size?

I need to have my device be able to produce sounds of at least two different frequencies, as loud as possible at around 3/5V. So far it seems like the best thing to go for would be a piezo speaker but ...
1
vote
2answers
295 views

What is Sensitivity in an ultrasonic transducer Specification?

So far I understand that Sensitivity of the transducer is defined as the ratio of its electrical output to mechanical input. While going through ultrasonic transducer specs, they have a rated ...
0
votes
2answers
159 views

How can I Improve the quality of an amplifier?

I amplify using LM358 Op-amp and 2 resistors. I played a song on my mobile. The output of the Mobile is the input of my circuit. The output of my circuit is connected to 8 ohm speaker. I hear ...
0
votes
1answer
47 views

Loss of pressure during sound propagation [closed]

I try to understand some things about acoustics and seems that I haven't understood many things. Suppose that the sound pressure at mouth is p_lips and the sound pressure at a microphone that is ...
0
votes
1answer
108 views

Relationship between transducer voltage and sound pressure

I understand that transducers produce a voltage that is approximately proportional to the sound pressure. For a given transducer supplied with 1000mV, how can I work out the sound pressure (Pa) ...
0
votes
1answer
47 views

Convert A weighted voltage output into sound pressure

I have designed an A weighting network circuit. but i cant understand how to convert it's voltage output in to corresponding sound pressure level in dB. So How can I convert these voltage readings ...
29
votes
8answers
6k views

How can “purely” electrical circuits emit sound?

Moving membranes or piezoelectric materials obviously produce sound waves, but how can "purely" electrical circuits such as transformers or DCDC choppers (and others) often have an audible noise? Is ...
0
votes
2answers
97 views

Electret Microphone recognize music with FFT

Do you think is possible that this Electret Microphone https://www.sparkfun.com/products/9964 plus a DSPIC can recognize music frequencys with a FFT, or the electret only recognize the sound levels?
3
votes
1answer
115 views

Fire pit dancing to music — increasing the voltage from a subwoofer out

I am creating a propane "regulator" which allows the user to connect a speaker output to control a valve (0-10V max:0.185A) which opens more with higher voltage. Here's a video of it operating ...
1
vote
1answer
206 views

Do smartphones and tablets generally use dynamic or condenser electret mics?

I've heard electret microphones are usually what's in a smartphone, but I've never heard about them. Is it the most common type or is it condenser or dynamic? Or a mixture of the three?
0
votes
0answers
458 views

One-shot sound button/trigger for Arduino Sound Player

I've succeeded in making a simple Arduino ATMega328 sound player on my breadboard following this guide. . . http://highlowtech.org/?p=1963 http://playground.arduino.cc/Code/PCMAudio But, here's my ...
-1
votes
1answer
119 views

Strange sound in speakers when the refridgerator goes standby [closed]

I live in a room which has two power sockets and the following devices, as illustrated in this diagram: https://docs.google.com/file/d/0Byu0T6y2SLeENDdvNGVCWHFBWmc/edit All devices look exactly as ...
0
votes
2answers
215 views

Advice on building a noise sensor

I'm attempting to build a noise sensor that detects loud environmental noise. The idea is that the sensor would be able to detect loud music or a loud television within 30 feet, in order to record a ...
0
votes
1answer
112 views

How does sonar locate an object in three dimensional space to output data for imaging?

I'm working on a small learning project where I want to connect sonar back to an android phone over bluetooth. I'm working with an hc- sr04 that a friend gave to me and I'm trying to piece together ...