What is Audio: Definition and 264 Discussions

DVD-Audio (commonly abbreviated as DVD-A) is a digital format for delivering high-fidelity audio content on a DVD. DVD-Audio uses most of the storage on the disc for high-quality audio and is not intended to be a video delivery format.
The first discs entered the marketplace in 2000. DVD-Audio was in a format war with Super Audio CD (SACD), and along with consumers' tastes tending towards downloadable music, these factors meant that neither high-quality disc achieved considerable market penetration; DVD-Audio has been described as "extinct" by 2007. As of June 2019, Amazon lists only 155 albums available on "Audio DVD". DVD-Audio remains a niche market but some independent online labels offer a wider choice of titles.

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  1. Phil Freihofner

    What are the physics of acoustics and how do they apply to music and the oboe?

    Hi - My name is Phil Freihofner. I live in Albany, CA. I am an alumni of UC Berkeley with an AB in Music. My main interests (pertaining to this site) involve the physics of acoustics, especially as they apply to music in general and the oboe in particular. I am also a Java programmer and am...
  2. Planobilly

    What is the effect on audio of using larger wattage resistor

    Hi, In general 1/2 watt resistors is what I see in tube guitar amps. I built one with 1 watt resistors and can not hear any difference. I assume shot noise will decrease with larger wattage values. Other than heat dissipation, how is a 1 watt resistor different from a 1/2 watt resistor...
  3. B

    Why does the picture on my videos not keep up with the audio

    I frequently download videos from youtube onto Real Player on my laptop. Lately, when I have played videos on Real Player, the picture of the video on my laptop's monitor will freeze for 10 or 15 seconds, but the audio keeps playing normally. Then after 10 or 15 seconds of my picture being...
  4. D

    Smearing an audio recording using Fourier transform

    Hi! I'd like to smear an audio recording, where the frequency content audibly changes, into an audio recording where it does not. Here's a recording of a sampled piano playing a melody, which will serve as an example: https://dl.dropboxusercontent.com/u/9355745/oldmcdonald.wav The frequency...
  5. slick_willy

    Jobs in audio amplifier circuit design?

    Hey guys (and ladies), I am a junior year EEE student at CSU Sacramento and am hoping to get a job in audio amplifier design as a career after graduating. I have always loved music and electronics and working in this field would honestly be like a dream come true. As far as my experience in...
  6. Sveral

    Can a Piezoelectric Transducer Double as a Microphone?

    Hello, I wanted to know, if a piezoelectric transducer can be used similarly to a microphone to output sound, when connected to the user? Here`s an example...
  7. Sveral

    Connecting an External Audio Source to a DDS-100 Function Generator

    Hello, I wanted to know, if it`s possible and how it to go about connecting an external audio source, for example, an mp3 player to the circuit of a DDS-100 Function generator, so that it outputs the audio from the mp3 in the selected wave form...
  8. Apoorv_7

    Can Audio Cancellation Occur in Space?

    Homework Statement I created a 180 degree phase shifted version of a song using matlab. They cancel each other out when i play them together using any mixer software,but do not do so when i play the actual and the shifted versions from different sources. Homework Equations Is this possible.Can...
  9. Marcin H

    Audio Amp with negative feedback

    Homework Statement Homework Equations The Attempt at a Solution I am not really sure how to do this problem. How can I convert from db to linear terms just given db? Don't I need more information? For do I have to do a system of equations or something using the Power gain =...
  10. V

    Audio amp for sonoluminescense

    I'm trying to replicate a simple single bubble sonoluminescence (SBSL) experiment. I have several sources that I'm using for reference and my setup is pretty similar to the one here: http://techmind.org/sl/ but our lab does not have an amplifier. I have tested the circuit w/o one (just running...
  11. I

    Help with my math in this 2nd order audio filter circuit

    I understand how to use the reactance equations (for capacitor, xc=1/(2PiFC), & for inductor xL=2PiFL when the filter circuit is of first order to get the component values I need, but I don't understand how the math works when the circuit is of second order. The man at the electronics store told...
  12. O

    Is my lecturer incorrect or did I just misunderstand? (sound quality)

    I'm a first year electrical engineering student and I had a lecture on Analogue and power electronics today. The main topic the lecturer was talking about was headphones and stereo systems etc. We learned about frequency responses and looked at product specifications and circuit analysis and...
  13. hypnoticdesign

    What exactly is a sample in terms of sample rate (audio)

    I can't seem to find an answer anywhere to this just by searching. I'm trying to understand samplerate more thoroughly. I know 44000 samples per second means that the highest frequency that can be recorded is 22000 hz but what is each sample? Does it mean there is a constant 44000 snippets of...
  14. 3301

    How Do I Set Up My New Audio System with Various Components?

    Can someone help me with this system. I need some basic guide what is going into what to make all of them work. CommunityVERIS V2-210S Subwoofer - 1 BLU50 (4x4 Signal processor) - 1 EC-4BV-BLK-US - Ethernet Controller 4 Buttons and Volume - 1 XLC2500 - power amp - 1 Cable,CAT5E 8P8C-8P8C Blk...
  15. F

    Determine speed of roulette ball through audio analysis?

    I'm trying to find a way to track the speed of a spinning roulette ball in real time through audio analysis, i.e. have a computer report the speed of the spinning ball it hears through a microphone.Here is a video of a spinning ball: I've tried watching a real time spectrum analyser (FFT), but...
  16. U

    Audio Amplifier Using TIP 147, 142

    << Obnoxious all caps post fixed by Moderators >> I have made an audio amplifier using an LM386 IC, but it does not amplify any sound from the microphone. Please help me to improve this using a Darlington pair or any other power transistor like the TIP147/142...
  17. PhysicoRaj

    Design an audio power amplifier

    Hello, I was dissecting an old TV when I came across a set of speakers. They're 8 ohms, though I'm not sure if they're 8w or 6w.. I decided to make my own portable speakers (mono), which could be connected by means of an aux cable to my smartphone. I don't know what's the output voltage of...
  18. C

    Effect of noise cancelling audio equipment

    Noise cancelling earbuds/headphones differ from noise isolating earbuds/headphones. Noise isolation just keeps the sound out, whereas noise cancellation actively produces sound in order to "cancel" noise.I understand how this works technologically, however do these sound waves cancel out so that...
  19. C

    Noisy audio preamp circuit, how to reduce hiss?

    Hello all, I am designing a microphone preamp with some odd conditions. The microphone is dynamic. The impedance of the microphone is around 4 to 8 ohms (very odd mic, M-87/AIC). The goal is to interface the mic with a PC sound card which is designed to operate with an electret type. I have...
  20. Gary Trinder

    Audio Crossover Frequency Equation....

    Can anyone verify or correct this equation to work out the crossover frequencies of a three tier sound system please? I never was the best in my physics classes... (Please find attached "Crossover Freq.dpf") And thank you in advance for your time. Sorry about the way i have had to write...
  21. T

    How do I analyze an audio amplifier circuit?

    Hi. I'm trying to analyse an audio amplifier circuit (DC, frequency response, stability, etc.). I began with the DC bias analysis but I'm having troubles finding where to start. I've attached the full circuit and a DC simplified version. I've placed an 8 ohm resistor as the load (8 ohm...
  22. J

    How can I stretch audio waves without distortion?

    Hello to anyone who reads this, and good day.I am an intermediate C++ programmer and I am looking to understand how to stretch or lengthen audio waves as long as I want without distortion. What I mean by "stretch" is to prolong the duration of every instance of sound. As of now I am assuming...
  23. davenn

    Tuesday Giggle - a little and cute bit of audio humour

    a fun play on words
  24. Gingerbunny82

    Analyse this amplifier for me please :)

    Hi folks, I've designed this amplifier, it uses an Ne5532p op-amp for the voltage amplification and feedback in the non-inverting configuration. The output stage is handled by two Darlington transistors, TIP 121 and TIP 126, these are hopefully biased by TIP 117 and TIP 112. I was hoping that...
  25. Natanijel

    Solve the Audio Jack Mystery with Nat

    Hello everyone :) I came across a strange situation today when I was listening to my music with my headphones on. When I pressed play to a song, the instrumental intro started off fairly normally (although the audio sounded a little "thinner" than usual, as if compressed), and then, when...
  26. S

    Audio amplified VSM (vibrating sample magnetometer) sample

    Hello, I am trying to get the induced emf reading from a sample in a vsm. A lock in amplifier is being used to read the signal. The problem is that the output voltage fluctuates heavily. Should I apply an audio amplified signal to my sample to make it vibrate ?
  27. P

    Engineer's Audio Guide to Higher Math Learning

    Hi, I'm an engineering major. I began my college years with a substandard understanding of math. I am now taking Calculus 3 and Differential Equations this semester. I have made average grades up to this point and I am actually improving in that respect. Hopefully I'll come out with an A and B...
  28. W

    Geophone Audio recording advice

    Hello, I am a music student and most of my work is concerned with field recording/ phonography. I am very keen to record the output of a geophone but I do not know how to connect/ convert the outputs for audio. I also know there is a similar thread to this but I don't think it's specifically...
  29. Alexandra7

    How to calculate audio power level?

    Homework Statement I am given 5 frequencies but I would like to know how to calculate the power level for both ears just for one of the frequencies (1000Hz) to get a general idea for the rest. In this experiment, we used audio headsets and recorded the voltage and resistance for the left ear...
  30. Greg Bernhardt

    AudioQuest Diamond: most expensive HDMI cables worth it?

    I was browsing amazon for some basic HDMI cables and was flabbergasted when I came across some by AudioQuest Diamond. They cost $1,494.75 for 6.5FT. https://www.amazon.com/dp/B003CT2A2M/?tag=pfamazon01-20 The information gives Solid Perfect-Surface Silver (PSS) Conductors Low Jitter, Low...
  31. AustinTahir

    Transformation of electronic audio signal into audible Sound

    Hello Guyz I've got a little Question For Seniors I hope You answer it Briefly , I know that whenever i plug in my USB Drive in my Loudspeaker or plug Speaker itself in my PC and play anything like a song an Electrical audio Signal is Produced which is transformed by Speaker into a audible...
  32. Krack

    Shielding & ground loop for audio

    I have a 3 conductor wire that are all wrapped in a foil shield with wire conductor, for a total of 4 wires. I am connecting the 3 inside wires to audio left, right, and ground. This is an unbalanced setup, right? Where/how do I connect the shielding? Do I connect both sides (i think no)...
  33. B

    How is this sound generated? / reverse engineer sound

    http://mynoise.net/NoiseMachines/twilightSoundscapeGenerator.php does anyone know how this sound is generated? are do anyone how to reverse engineer? Audacity to record the sound and do a fft ... anyone else know what I can do to reverse engineer this sound?
  34. M

    What is the cause of an increase in volume (audio)

    This is just a question I posed to myself while learning about waves, I was wondering how the volume of an audible noise is increased or decreased, is it related to the compression of the wave and therefore the force generating it? If somebody could explain this in mathematical terms or provide...
  35. R

    Filtering Audio Voltages <4VPK with IC/Circuitry

    I'm working on a circuit involving an incoming audio signal via a 3.5mm headphone jack. The circuit cannot handle voltage spikes greater than 4 VPK. Is there any sort of IC, or circuit that allows voltage under 4 VPK to pass through, but filters any voltage over 4 VPK to exactly 4 VPK? The only...
  36. P

    Coilgun with car audio capacitors

    Hi guys, I'm new to this forum and I just started working on my first coilgun. I've watched several tutorials on how to build a coilgun but all the capacitors they use in the coilguns are electrolytic capacitors. The capacitors don't deliver as much energy as the car audio capacitors. I'm...
  37. B

    Would a guitar tuner work on a human voice ?

    So I have a program that works for a guitar, and sinewave and a saw tooth wave . so If a have person sing a note, it should work for that right ? I am not talking about sing a whole song but just a note. so like when people sing the scales: do ra me fa so la ti do is should would for that right...
  38. K

    Question based on folllowing diagram (TDA audio amp):

    guys for the critical frequency for low pass is it the following: 1/2pi* 2.2*10^(-6)*100k?
  39. R

    How calculate a single frequency of a multifrequency signal?

    I'm just coding a program where I've to calculate the individual frequencies inside an audio file *.wav file. The modulation is pcm and the information I've is a lots of points, like this: http://www.renesas.com/media/support/faqs/faq_results/Q1000000-Q9999999/samp_1.gif To be exact, I've...
  40. WineRedPsy

    Audiobooks or lectures to listen to at highschool-level

    (Not a 100% this goes here but oh well) I imagine there's not a lot of this, since visual presentation is pretty important in these subjects, but does anyone know any good lectures or audiobooks on highscool/Secondary mathematics or physics that one could listen too while taking a promenade...
  41. S

    Ending bachelor - Audio Spotlight

    Hi there, I am trying to finish my bachelor - meaning I have to prepare the document at the and of my studies at first bologna stage - studying Physics. Well I don't really have any good ideas on what to research - what topics, but I did manage to find out this...
  42. B

    C# Karplus-strong algorithm in c# with Naudio

    Mod note: Added [ code ] tags to the following code. I wrote the karplus-strong algorithm in c# using Naudio. I plays the sound, but it does not stop. It should get to 0 and you should not hear anything. but I code get point where it just repeats the same value over and over. so I when in and...
  43. BeautifulLight

    Help designing 2-way audio crossover

    Mid-woofer Tweeter Links: https://www.parts-express.com/vifa-oc25sc65-04-1-textile-dome-tweeter--264-1018 https://www.madisoundspeakerstore.com/silver-flute-woofers-6-7/silver-flute-w17rc38-04-ohm-6-1/2-wool-cone/ For tweeters, they say to take the resonant frequency and multiply that by...
  44. E

    LaTeX Creating a PDF Audio Presentation

    Hello all, I have created a PDF presentation using LateX. I want to add my commentary on the slides by recording my explanation using a mic and mark some parts of the slides while I am commenting, at least to be able to point where I want using the cursor. How can I do that? Thanks
  45. S

    Audio for Wikipedia math articles

    The Wikipedia has a project for creating audio articles. https://en.wikipedia.org/wiki/Wikipedia:WikiProject_Spoken_Wikipedia What would be a good way to use audio in mathematical articles?
  46. gaba

    EMF generator from audio speaker

    Hello everybody, I am trying to figure out how to build an electro magnetic generator. I was wondering if an audio transducer such a speaker could act as a EMF generator, when the paper woofer is removed and the device connected to a function generator and an amplifier, in order to play the...
  47. gaba

    EMF generator from audio speaker

    Hello everybody, I am trying to figure out how to build an electro magnetic generator in order to stimulate my home and my brain with beneficial frequencies such as the Schumann resonance and doing perceptive experiments on all the surrounding frequencies. I was wondering if an audio transducer...
  48. preston8

    Digitally Controlled Audio Splitter Switch

    Hello, I'm needing to send an intercom signal from a lobby to one of eight different rooms. I am creating a touch-screen interface with a Raspberry Pi under the hood that acts as an intercom. The user needs to be able to select any room they wish to speak to (even all of them at the same...
  49. M

    What causes latency from audio signal in to out in computers

    I am just a beginner so if I am asking in the wrong forum please move it to the more relevant one. From my understanding, electromagnetic waves are what carry audio signals and dependent on the conductor, this speed varies. I have read coxial will carry at about 2/3 speed of light, and...
  50. M

    Feynman Audio Lectures: Complete Set Available?

    I love Feynman's Lectures on Physics and want to go over them again, but I find there's so much of his character is lost when just reading them. I have found a few selected audio versions of his lectures, but I would like to find the COMPLETE set. I know they exist somewhere, as that's how they...
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