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Topic: Audio signal processing


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In the News (Sun 16 Jun 19)

  
  Audio signal processing - Wikipedia, the free encyclopedia
Audio signal processing, sometimes referred to as audio processing, is the processing of a representation of auditory signals, or sound.
The focus in audio signal processing is most typically a mathematical analysis of which parts of the signal are audible.
Which parts of the signal are heard and which are not, is not decided merely by physiology of the human hearing system, but very much by psychological properties.
en.wikipedia.org /wiki/Audio_signal_processing   (206 words)

  
 Audio signal processing Info - Encyclopedia WikiWhat.com   (Site not responding. Last check: 2007-11-06)
Audio signal processing, sometimes referred shortly to as audio processing or just audio, is the processing of some representation of auditory signals, that is sound.
The focus in audio signal processing is most typically in an analysis of which parts ofa signal is audible.
Processing methods and application areas include such as storage, compression, transmission, enhancement (e.g., equalization, filtering, noise cancellation, echo removal or addition etc.), source separation, sound effects and computer music.
wikiwhat.com /encyclopedia/a/au/audio_signal_processing.html   (216 words)

  
 Digital signal processing - Wikipedia, the free encyclopedia
Digital signal processing (DSP) is the study of signals in a digital representation and the processing methods of these signals.
DSP and analog signal processing are subfields of signal processing.
Since the goal of DSP is usually to measure or filter continuous real-world analog signals, the first step is usually to convert the signal from an analog to a digital form, by using an analog to digital converter.
en.wikipedia.org /wiki/Digital_signal_processing   (1390 words)

  
 Audio Signal Processing
Dynamic range compression may be used to increase the volume of the softer passages of an audio signal relative to its louder portions, thus making the signal better suited to transmission through or storage on a given medium.
Particularly for audio signals that are sinusoidal in nature, such as vowels of human speech or sustaining tones of a musical instrument, I have been experimenting the idea of watermarking by quantizing the frequency.
Fortunately, musical signals are highly structured--both at the signal level, in terms of the spectrotemporal structure of note events, and at higher levels, in terms of melody and rhythm.
ccrma.stanford.edu /overview/dsp.html   (3109 words)

  
 Signal Encyclopedia Article @ NaturalResearch.org   (Site not responding. Last check: 2007-11-06)
Signal analysis and signal processing are collections of techniques used to extract information from signals.
A signal (computing) is an event (a message, a data structure) transmitted between computational processes;
Signals (biology) are electrochemical activity in an organism;
www.naturalresearch.org /encyclopedia/Signal   (290 words)

  
 Class Definition for Class 381 - ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES
This class provides for: (a) wired one-way electrical transmission or processing systems for audio signals, (b) Stereophonic systems, which are not elsewhere classified, (c) instrument or process for converting an electrical audio information signal to or from humanly audible form.
An "audio" signal is an electrical signal which represents spoken or other sounds which vary with time, and may be in analog or digital form.
Combinations of a loudspeaker or microphone with another audio signal processing device (e.g., amplifier, filter, etc.) or other circuit (e.g., bias circuit) are classified herein even if the loudspeaker or microphone is included by name only.
www.uspto.gov /go/classification/uspc381/defs381.htm   (2760 words)

  
 Class 381: ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES / U.S. Patent Classification Definitions
Subject matter in which the unwanted signal is either at least partially removed by processing a selected frequency or frequency band, such as by subtracting the contents of a particular frequency band from the input signal, or is overcome by preemphasis of a particular frequency or band to enhance the signal to noise ratio.
Subject matter in which audio signals, prior to delivery to the earphone, are processed in order to give an illusion that the spatially related sounds are being emitted from physically distinct locations in the earphone user's environment.
Subject matter in which the particular kind of undesired signal is howling or screeching caused by a return to the hearing aid's input of a sufficient fraction of its output to cause oscillation.
www.uspto.gov /go/taf/def/381.htm   (8693 words)

  
 Welcome to the IEEE Signal Processing Society Homepage
The Signal Processing Society's Field of Interest shall be the theory and application of filtering, coding, transmitting, estimating, detecting, analyzing, recognizing, synthesizing, recording, and reproducing signals by digital or analog devices or techniques.
The Signal Processing Society is an international organization whose purpose is to: advance and disseminate state-of-the-art scientific information and resources; educate the signal processing community; and provide a venue for people to interact and exchange ideas.
We do this by: being a one-stop source of signal processing resources; providing a variety of high quality resources to a variety of users in formats customized to their interests; adapting to a rapidly changing technical community; and being intimately involved in the education of signal processing professionals at all levels.
www.ieee.org /organizations/society/sp   (193 words)

  
 Sonic Flow: dataflow-inspired audio signal processing   (Site not responding. Last check: 2007-11-06)
Sonic Flow is a set of C++ libraries and C wrappers for dataflow-inspired audio signal processing.
Sonic Flow uses the libsndfile or audiofile library for audio file input and output.
This signal processing software project was originally carried out at Tampere University of Technology for the course 80961 Signal Processing Project in fall 1998.
sonicflow.sourceforge.net   (335 words)

  
 HUT Acoustics Laboratory / Teaching / S-89.3580 Audio Signal Processing Seminar
S-89.4820 Postgraduate Course in Audio Signal Processing (8 cr) PV The topic in Fall 2005 is Mobile Audio.
The specific audio processing techniques include sound processing algorithms for headphone listening, audio coding, sound synthesis, and sonification among others.
The seminar (S-89.3580) is targeted for students working for the Master's degree in acoustics, audio signal processing, or digital signal processing.
www.acoustics.hut.fi /teaching/S-89.3580   (1302 words)

  
 Elysian Audio: Rapture Audio System - Control and DSP Audio   (Site not responding. Last check: 2007-11-06)
The most important active functions of the Audio Signal Processing system are to properly send the high frequencies to the ESL amplifier and the low frequencies to the Bass Amplifier.
It is common for consumer electronics gear to have a 3 or 5 band graphic equalizer that breaks the audio signal into 3 or 5 frequency bands and adjusts the gain of each band independently.
An additional function that might be necessary or useful is the ability to delay a portion of the audio signal to correct for the listening room response.
www-personal.engin.umich.edu /~jglettle/section/rapture/dspup.html   (1305 words)

  
 Digital Signal Processing Audio System   (Site not responding. Last check: 2007-11-06)
Analog audio signals (such as cassette tapes or radio broadcasts) must be converted to digital through a converter.
After processing, the digital codes must be converted back to analog to be amplified and sent to the speakers.
Digital Signal Processing allows better/more consistent control over the audio signal, because processing is not dependent on material properties of linear circuit elements (which can vary with environment).
media.ford.com /print_doc.cfm?article_id=2586   (212 words)

  
 Waves Ltd. Digital Audio Processing   (Site not responding. Last check: 2007-11-06)
Waves Ltd. is the world’s leading developer and supplier of audio signal processing software tools to the most demanding audience in the world: professionals who record, mix, and master the world’s top-selling music, movie soundtrack, and multimedia titles.
The Waves mission is to leverage its expertise in audio digital signal processing and psycho-acoustics -- the science of how sound is perceived -- to develop technology that revolutionizes and dramatically improves sound quality for all audio applications.
As a result, all of the major digital audio editing systems need to use third party plug-ins to offer the best audio, and Waves plug-ins are the most recognized and awarded products due to their unsurpassed sound quality and intuitive user interfaces.
www.waves.com /content.asp?id=49   (761 words)

  
 Audio Signal Processing Discussion Group | Forum
Technical discussions related to Audio Signal Processing (digital effects, acoustics, noise reduction, musical signal processing, etc).
My present project is to analyze the correlation between two audio signal.
I want to save time in the process of fft,I know there is one method...
www.dsprelated.com /groups/audiodsp/1.php   (242 words)

  
 Audio Signal Processing in Java and Ptolemy II   (Site not responding. Last check: 2007-11-06)
This project is exploring the implementation of hard-real-time systems, particularly audio signal processing, using abstract models of computation and the Java language.
We are currently implementing a particular audio signal processing algorithm [2,3] under various domains in Ptolemy II and as a stand-alone Java application, and evaluating the performance bottlenecks.
The process of implementing the pitch shifting algorithm in HDF may provide insight as to the intuitiveness of constructing models using this model of computation, and may also influence design decisions such as when to construct static vs. dynamic schedules.
ptolemy.eecs.berkeley.edu /projects/summaries/00/vogel00.html   (353 words)

  
 GPGPU » Audio and Signal Processing   (Site not responding. Last check: 2007-11-06)
In this masters thesis by Marcin Jdrzejewski, ray tracing is implemented on the GPU to accelerate computation of sound paths between sound sources and receivers.
Each ray averages 16-20 wall reflections, and those rays that intersect a sphere approximating the receiver are included in an echogram that is used in the auralization process.
Audio Video Exchange (AVEX) converts digital audio into graphics data, and then performs effect calculations using the 3D architecture of the GPU.
www.gpgpu.org /wp/category/audio-and-signal-processing   (296 words)

  
 Clear, Efficient Musical Signal Processing in ANSI C
There is therefor a bias in the example code towards audio signal processing, but the recommendations apply to numerical computing in general.
An important use of the frequency parameter is in the representation of a phase increment for synthesis of periodic signals using linear oscillators.
If the signal to be synthesized is read from a table that has a length which is a power of 2, a very efficient oscillator implementation is possible by accumulating integer phase increments [Hartmann].
www.cnmat.berkeley.edu /~adrian/Csigproc.html   (4189 words)

  
 networked_performance: Audio Signal Processing Workshop
Audio Signal Processing/Digital Sound Workshop: Rotterdam, 1 - 4 September 2005; Applications Deadline August 19, 2005--In a four-day workshop hosted by V2_, sound artists Frank Barknecht and Aymeric Mansoux will introduce the basics of Audio Signal Processing (ASP) in the fields of real-time music production.
This workshop specifically targets people who want to develop their work in the digital sound field or those people curious about the processes involved behind the audio software they already use.
The workshop also teaches and demonstrates which free technologies are available for audio streaming, such as icecast, ogg and vorbis.
www.turbulence.org /blog/archives/001163.html   (294 words)

  
 ELEC 484 - Digital Audio Signal Processing   (Site not responding. Last check: 2007-11-06)
There are 18 copies of this clipping, each pitched shifted to produce a sound similar to a guitar pluck.
This is similar to sending an amplified signal into a stero, but keeping the stereo volume down.
This produces non-linearities in the output signal as one might expect at the top level of an inexpensive amplifier.
web.uvic.ca /~nej/assignment1.htm   (379 words)

  
 Amazon.com: Digital Audio Signal Processing: Books: Udo Zölzer   (Site not responding. Last check: 2007-11-06)
At present there is no single source which covers signal processing, audio processing in computer music and advanced analyses of real-time signal processing.
Presented in two parts: the first section shows a basis for hardware systems used in digital audio signal processing and the second part discusses algorithms for processing digital audio signals.
In this introductory chapter, the fields of application for digital audio signal processing are presented.
www.amazon.com /exec/obidos/tg/detail/-/0471972266?v=glance   (898 words)

  
 Wiley::Digital Audio Signal Processing   (Site not responding. Last check: 2007-11-06)
Well established in the consumer electronics industry, Digital Audio Signal Processing (DASP) techniques are used in audio CD, computer music and DAT components.
In addition the applications afforded by this versatile technology now range from real-time signal processing to room simulation.
For Research Students in Signal Processing or Applied Physics it transforms erudite audio signal processing theory into tangible concepts.
www.wiley.com /remtitle.cgi?isbn=0471972266   (220 words)

  
 Digital Audio Signal Processing
The digital audio signal processing laboratory is beginning its second year of operation in the Engineering Department at Hofstra University.
The lab work of the DSP course is centered around the design of real-time digital audio effects for the electric guitar.
The professional audio equipment in the lab consists of a Yamaha FX 770 Digital Effects rack unit, a Fender Stratocaster electric guitar, a Epiphone Les Paul electric guitar, a Mackie 1202 mixing board, a Denon CD player, a Samson power amplifier, and a pair of Tannoy near-field loudspeakers.
www.hofstra.edu /Academics/HCLAS/Engineering/egg_adio_lab.cfm   (199 words)

  
 HUT Acoustics Laboratory / Teaching / S-89.580 Audio Signal Processing Seminar
In fall 2004, the topic of the seminar on audio signal processing is model-based sound synthesis.
The seminar (S-89.580) is targeted for students working for the Master's degree in acoustics, audio signal processing, or digital signal processing.
Matti Karjalainen (HUT, Laboratory of Acoustics and Audio Signal Processing): "
www.acoustics.hut.fi /teaching/S-89.580/2004   (1689 words)

  
 Events of the AES: AES 112th Convention: W11 Digital Audio Signal Processing - The Good, the Bad, and the Ugly
High-quality digital audio signal processing is not as straightforward as it appears at first sight; and, as we move into the era of high-resolution digital audio, the quality of the associated signal processing must increase commensurately.
Traps abound, and some of the more esoteric types of processing errors may not be revealed without careful listening tests or special test signals.
Although this Workshop will assume that the audience has some familiarity with digital signal processing theory and practice, the presentations will be such that even those without much background will benefit from attending.
www.aes.org /events/112/workshops/w11.cfm   (474 words)

  
 Unique Selling Points for ARX Audio Signal Processing
ARX Systems is owned and run by Audio Engineers with over 60 years combined experience in our industry.
And because we're dedicated audio professionals, there is comprehensive 3 way EQ on the microphone and 2 way EQ on the stereo audio sources.
Unbalanced Hi Z ins, Balanced XLR outs, with individual audio ground lift switches, the DI6s is a total pro audio interface solution.
www.arx.com.au /USPs.htm   (1729 words)

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