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. X

    Audio annunciator suppression.

    I am searching for an easy solution for an exasperating nuisance. There is a public address system at work and before the start of the messaage a loud audio annunciator frequency has been added to warn people of the upcoming message and I want to locally supress it but still receive the...
  2. C

    Replacing an Audio Transformer: EI-19 Output Specs and Replacement Guide

    I need to replace an Audio transformer, EI-19 Output Transformer. What should I replace it with? I can't find the primary to secondary ratio, or the voltage ratings. Is there something special about audio transformers compared to step up/down transformers used in AC to DC converters? If so, what...
  3. S

    Operation amplifier audio equalizer

    Homework Statement I am to construct a circuit which can provide variable gain for the bass, midrange, and treble frequencies of an input. One of the stipulations is that I should use as few elements as possible. Homework Equations n/a The Attempt at a Solution Right now the only...
  4. B

    Treble and bass audio controls w/o phase shift?

    Simple treble and bass controls in audio equipment use RC networks that have a phase shift equal to a radian per neper, or about 6.6 degrees per dB of boost or attenuation. Are there analog treble or bass control circuits that have no phase shift?
  5. T

    Digital Audio Player Circuit Question

    Hi, First time poster here. I am just wandering if anyone could get me started on this question. I have attached it. I been doing some studying on my own, but I may not be able to cover all the material needed to finish. I know the digital to analog converter can be collapsed to a single...
  6. S

    Audio Editing Software: Add Music to Videos

    hello do u kno of any site that offers a software to separate audio from video and allows us to play some other audio in the background..the way they do on youtube videos...?
  7. glondor

    Stereo Earpieces for Hearing Impaired: Solutions for Half-Sound Audio

    Hi all. Anyone ever heard of a stereo earpiece? My son is deaf in one ear and when he uses headphones he looses half the sound. Ear buds are the same. only half the sound comes thru. I wonder if there is a full sound earpiece out there some where. IE both channels of sound in one earbud.
  8. R

    Solving AC Noise in Fuzz Box Bass Guitar Circuit

    I'm working on a 'Fuzz box' for a bass guitar, ckt diagram below. With fuzz on and gains up, I'm getting a strange (to me) AC artifact -- Oscope images below (AC waveform from isolation xfmr at 10V/div, signal out at 2V/div). With fuzz on, and the input shorted to ground, the artifact is...
  9. S

    MATLAB What is the plot when analyzing audio signals in Matlab?

    Hi, I am trying to get a plot of the sound's magnitude vs. frequency. I have managed to read in a wav file as a matrix. I then compute the fft of this matrix. When I plot the absolute value of this, I get a symmetric plot with peaks at the start and the end. What is this a plot of? Is it...
  10. N

    Audio signal transfer by laser

    I came up with this idea purely because I had some free time over the weekend. Basically, I want to transmit audio signals (i.e. from a standard 1/8" audio jack) by laser (in essence, streaming it by laser to a speaker setup somewhere else). Most of my interest are not on the circuitry side of...
  11. Chandra214

    Is a Wireless Audio Transmitter Feasible with 2.4GHz Band and an Audio Codec?

    Hi All, we are planning to build a wireless audio transmitter. In 2.4GHz Band. I would acknowledge that this is my first audio interfacing project. So i have a lot of doubts about the way i can interface audio and stream the data out. we plan to use an audio codec which can take Mic ( line...
  12. C

    Audio Signal Project: Amplifying Ipod Output for Music System Speakers

    We're studying BJT amplifiers, and the project that I've chosen to do is to get my Ipod to to play on my music system speakers. The idea is to amplify the output signal from the ipod using a biasing circuit and transistor amplifier and use it as input for the pair of speakers. Ill most...
  13. E

    Troubleshooting Audio Noise in SMPS at 50KHz: Tips and Solutions

    I have a problem with my switch mode power supply, smps. It creates audio sound when I power it up, especially at minimum load. As I increase the load then sound disappears and in some designs it is still there. I don't know what to do. It is a bottleneck for me. Anyone who knows what to do...
  14. D

    High Quality Audio CD burning

    What are the things to try and control when attempting to burn a high quality audio CD for my CD player in my truck? I am sure there is a bit rating on the file, but are there other things that I can change to get better quality out of my burns? Do better quality CD's make a difference...
  15. U

    Why audio speaker produces the same sound wave?

    I played the audio song on my 8 Ohm audio speaker. I used my Computer Audio Port to play the song. I played that song on my speaker, it worked perfectly, but when I invert the audio signal 180' out of phase, the voice generated was the same. That is to say, when the speaker used to contract, it...
  16. A

    Physics Audio and Physics career choices?

    Hi, I want to get a bachelor's in physics and math, with a master's in engineering... that's the plan, but what I'm really into is high tech audio hardware; monitors, mixers, etc... I'd really like to design this type of technology---does anyone know how I would go about getting to this...
  17. madmike159

    Free Audio Extractor Tool From Video - No 30 Second Limit!

    Does anyone know where I can get a good free tool that takes the audio from video. I found some but they only do 1/2 of what you want or up to 30 seconds.
  18. C

    Some Audio Related Questions

    Here are some questions that I need help with, I'm a music performance major, but have to take a physics of sound class to graduate, please help! I have three questions: 1. Your city ordinance states that a motor vehicle is in violation if it produces a sound level of 80 dBA at 20 feet from...
  19. O

    Simple Audio Cancellation Techniques for Noise Reduction | Audio Setup Help

    Some background information: I am trying to cancel audio signal/noise in an enclosure I have constructed. I have two identical woofers positioned opposite each other in the enclosure. I have a very accurate sound level measurement microphone positioned between the two drivers. I am using sound...
  20. Evo

    Why Is My Computer's Audio Fine for CDs but Not for Online or Stored Files?

    Can anyone help me with a weird problem I am having on my computer? When I play a CD or DVD in my computer the sound is fine. When I try to listen to something on a website like youtube or even a file already on my hard drive, I can barely hear it. I have already checked all of the volume...
  21. T

    Help with a simple amplifier design for an audio signal.

    Hi, I'm designing an amplifier and need help with some basic ideas (Filtering is already taken care of). My main question is bolded. The output is an audio signal, and it drives an 8 ohm speaker. The power is 1 watt through this speaker. The input signal is coming from another amplifier...
  22. O

    Building an audio phase adjuster to adjust a range of signals

    My colleagues and I are building a phase adjuster for LFN (Low Frequency Noise) audio signals. Since we would like to be able to adjust a range of signals that encompasses a range of around 50-400 Hz, an op amp-driven, analog solution would not be economical, nor efficient. Since we need to be...
  23. M

    MATLAB MATLAB: Using WavWrite to Create a Single Audio File

    I am a MATLAB newbie, and apparently I am having a terrible day because everything that I do in MATLAB has been resulting in an error and/or undesired behavior. I am trying to write out a 'wav' file using a number of MATLAB created audio samples (simply by generating them using a sin...
  24. X

    Solving Audio Stereo Problem: Expression of (M^2) + (D^2)

    Homework Statement The problem is given in the attachment below. The relevant information is provided under the "Stereo Audio" heading. Additionally, I have a couple of pieces of extra information not listed in the Stereo Audio section: M is the component of (column vector) [R, L] on...
  25. marcus

    Noncommutative Geometry blog has audio of David Hilbert

    the NCG blog has various interesting stuff one thing was this link to a 4 minute talk by David Hilbert http://math.sfsu.edu/smith/Documents/HilbertRadio/HilbertRadio.mp3 wide audience, nontechnical here's NCG blog http://noncommutativegeometry.blogspot.com/ and the brief post about...
  26. S

    Can a Simple Relay Switch Between Audio Signals for a Motorcycle Stereo System?

    Please bare with me here, you will quickly see that I know just enough on this subject to be dangerous. I'm trying to switch two audio signals on and off into one Aux audio input of my motorcycles stereo system. I have a Satellite Radio that I want to hear most of the time. I also have a GPS...
  27. berkeman

    Voice Synthesis with a uC - Audio File IP Available?

    Voice Synthesis with a uC -- Audio File IP Available? I'm working on a project that will involve voice synthesis and playing simple tones using a mid-range 8-bit microcontroller (uC). I've done my own proprietary tone synthesis many years ago (with an 8051), but for this present project, I'd...
  28. marcus

    Smolin's Loops 07 talk is up (slides and audio), looks like a biggie

    http://www.matmor.unam.mx/eventos/loops07/talks/PL5/Smolin.pdf http://www.matmor.unam.mx/eventos/loops07/talks/PL5/Smolin.mp3 The Loops 07 website continues gradually posting the slides and audio of the talks and several very interesting new ones are now online as of 14 August. I just...
  29. N

    Powering 12v Air Pump with Audio?

    Hi, I'm currently an art student at the University of Houston, and I've run into a bit of a roadblock. I'm working on an installation in which an audio signal from a headphone jack will be sent to an A/V Receiver Unit. From the A/V unit, the wiring for the left speaker will be hooked up to...
  30. marcus

    Loops '07 has slides for the talks (some audio as well)

    http://www.matmor.unam.mx/eventos/loops07/ click on "program"
  31. M

    Medical Researching Inner Monologue: Experiments & Audio Tools

    Is anyone currently researching the inner monologue? Where can I find information about experiments to alter the inner monologue? Are there any websites which have "audio tools" which, when listened to, can positively alter the tone and function of the inner monologue? Cheers,
  32. Y

    Amplify Audio with Pencil Cells | Class 11 Student

    how to amplify audio? i have a small mono speaker bigger than a headphone roughly the size of the cheap ones one get with a pc.the problem is that i want to amplfy it using pencil cells.Its just to listen to my ipod while traveling without using my earphones.without the amplifier the sound...
  33. E

    Speed of rotation of an audio record or audio tape

    My friend and I wondered this in junior high school: since a record (as in the kind played on a record player) or an audio tape turns at the same speed, doesn't the head reading the record or audio tape move faster on the outer edge? This means that the sound recording is more tightly...
  34. M

    Slow Down Computer Audio: A Guide

    MY COMPUTER PLAYS ALL AUDIO TO FAST HOW TO SLOW IT DOWN?:rofl:
  35. wolram

    Web cam with good picture and audio quality

    Help please, is there such a thing as a wireless web cam that i can just use with out any mods or additions to my desk top? I need one with good picture and audio quality, and i need it to work 4yrds from the desk top. If there is no such thing can some one recommend a standard one for up to £50?
  36. A

    Using Series Resistors for Audio Sources: Is Jumpering Channels Safe?

    My understanding of a passive summing mixer is to use series resistors to limit the voltage from multiple sources so as to not over drive the destination? If you are combining two audio channels say from a VCR and jumper the left and right channel will this have serious reprocutions for the...
  37. K

    Looking for an expert with .VOB and audio files

    Does anybody know how to export audio from a .VOB file and still have it match the video? I'm able to export 6 tracks of audio from a stereo .VOB file but (perhaps because of a difference in frame rate) the audio comes out slightly longer than the .VOB file and I can't get it to match up...
  38. H

    Looking for some app to capture audio from video

    Hello guys, I'm looking for an application to capture audios from videos, best if into .mp3 format. It'd also be great if I can modify quality by myself. I'd rather prefer it to be free, but doesn't have to. Thanks,
  39. U

    Sry, wit pci audio, intel 82810 controller

    heya, recently i had to have a buddy of mine kill my comp and install windows 98se, now i got mostly everything working except the audio device, i think maybe even my video isa bit screwy...anyway igotta p3, 733mhz, 158mb ram, intel graphics controller which Used to work withan intel 82810...
  40. D

    Designing Audio Amplifier with BJT and MOSFET Components

    Hi, I'm new here. can somebody put here an a schematic of Class AB, D,G or T. I need an audio amplifier that work with bjt and mosfet simultaneously, i think that kind of amplifier is class g, but I'm not sure,for example i saw an 5000w amplifier with 2sc5200 and his pnp pair working with...
  41. N

    Exploring Car Audio Amplifiers

    Hello everyone. I have been roaming around these forums but just finally decided to join. I did not exactly know where to post this so bare with me if you will. Anyways, I am in my second freshman semester as an EE undergrad and I am taking Honors Physics II. As a requirement of this...
  42. M

    Finding a PC Application for Audio Recording & Fourier Analysis

    Can anyone recommend an application for PC that can take an audio recording, perform a Fourier transform, and return the audio recordings' frequency spectrum AND phase information? I can find plenty of programs that return the frequency spectrum, but I've had no luck finding one that...
  43. V

    Famous cosmologists discuss dark matter/energy (Audio)

    http://www.chicagopublicradio.org/programs/atoz_specials.asp#universe Conclusion: America is wasting money yet again on extravagant missions (Mars/moon) when it could be going to more worthwhile projects with bigger scientific returns.
  44. exequor

    Buy Dual Pair Audio Wire for RCA Connectors

    Does anyone happen to know where I can purchase dual pair audio wire for use with rca connectors. In the event that you are puzzled I'm speaking of the audio cable like the one you have to connect your dvd player to your television, but without the connectors. I can only seem to find single pair...
  45. T

    Physics Audio Lessons | Quality Radio Stations & MP3s

    Heu does anyone know of any quality physics radio stations or different lessons of maybe even books read as mp3s or such that you could post some links to?
  46. dduardo

    Desktop Headphone Audio System w/ USB DAC, Amp & Insulated Headphones

    I'm looking for a good headphone audio system for my desktop that incorporates a USB DAC to plug into my computer, an amp and a comfortable pair of headphones. The amp should use transistor technology and be class A or AB. In terms of the headphone I'm looking for a closed design that is...
  47. K

    Audio - mixing Mono with stereo?

    Hi. I am designing a very basic audio mixer circuit for use in my car before my amplifier. I need to mix one mono signal, and three stereo signals. I think my diagram is basically correct so far: http://img464.imageshack.us/img464/7110/mixer9lb.jpg I plan to measure the average...
  48. K

    Physics Audio Tapes: Learning, Lectures & More for Your Drive

    I'm just curious as to if there are any physics audio tapes (CDs, mp3s, cassette, or whatever else) out there. It takes me about an hour to drive to work & then back. Just seems such a waste to not use that time :smile:. These could be lectures, learning, etc. that would be prefably intro to...
  49. Averagesupernova

    Advice on Using BASIC for Instrument Control & Audio Playback

    Ok I suspect it may be pointless to post here considering the bad rap that BASIC gets. I have a fair amount of BASIC experience in instrument control. I started out with Commodore BASIC and moved up through QBASIC and Quick BASIC (yes there is a difference) and through Visual BASIC 6.0. BASIC...
  50. dduardo

    Gentoo Linux PC in a Mazda: Amazing Audio & Automobile Control

    This guy installed a pc with gentoo linux in this mazda: http://www.timekiller.org/carpc/ Things he could do:
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