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Topic: Audio-frequency

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Related Topics

Frequency

Sound

Frequency modulation

Frequency modulation synthesis

FM stereo

Mediumwave

Commutator (electric)

Amplitude

Alternating current

FM band

Radio broadcasting

Hertz

Wire

21st century

Audio frequency-shift keying - Wikipedia, the free encyclopedia Audio frequency-shift keying (AFSK) is a modulation technique by which digital data is represented as changes in the frequency (pitch) of an audio tone, yielding an encoded signal suitable for transmission via radio or telephone. Dual-tone multi-frequency (DTMF) is another encoding technique which represents data using pairs of audio frequencies. Normally, the transmitted audio alternates between two tones: one, the "mark", represents a binary one; the other, the "space", represents a binary zero. en.wikipedia.org /wiki/Audio_frequency-shift_keying   (319 words)

Definitions by Category at Audio-Direct.Com The range of signal frequencies supplied by an amplifier or reproduced by a speaker or microphone, as specified by the upper and lower bounds of the frequency range in Hertz (Hz). The range of signal frequencies supplied by an amplifier or reproduced by a speaker or microphone as specified by the upper and lower bounds of the frequency range in Hertz (Hz). Bipolar junction transistor, as often used in the power output stages of audio amplifiers for its superior high-power efficiency. www.audio-direct.com /Questions/feature_guide/definitions.htm   (11178 words)

Audio frequency - Wikipedia, the free encyclopedia An audio frequency (abbreviation: AF) is any frequency from about 20 hertz to about 20 kilohertz, which is the approximate range of sound frequencies audible to humans. The variable whose frequency is being measured can be any physical property capable of oscillating in this frequency range, such as electric current, sound pressure in air, or mechanical vibration. Rhythm frequencies, where the lower and upper bass notes lie. en.wikipedia.org /wiki/Audio_frequency   (139 words)

DSP Voice Frequency Compandor First, the encoder takes an audio signal from a microphone, digitizes it with an A/D converter, and presents it to two specially designed digital filters (Filter #1 and #2) which eliminate all but the most important frequency components. Simply put, frequency companding is a method of removing the most unused frequency components from a given source and then shifting the remaining components together. Frequency shifting can be done quite simply by multiplying a signal in the time domain by a complex exponential. www.wwc.edu /~frohro/qex/qex-art.html   (2443 words)

Nyquist Theorem Details Nyquist's frequency is the frequency that no part of the source material may attain or exceed, which is half of the sampling frequency. But as a hint we will state that the sampling frequency is the frames per second rate and the frequency we are trying to reproduce is the rate at which spokes pass the "6 o'clock position" on the wheel. The other half is that when the highest frequency content of the subject is close to half the sampling rate, the process of turning the samples (digital representation) back into a waveform or video scan line (analog representation) is complicated and sometimes not done right. members.aol.com /ajaynejr/nyquist.htm   (2368 words)

Audio Glossary The former is mechanically connected to the speaker cone and causes the cone to vibrate in response to the audio current in the voice coil. The roll-off frequency is usually defined as the frequency where response is reduced by -3 dB. It is measured in ohms and varies with the frequency of the signal. diyaudiocorner.tripod.com /def.htm   (5241 words)

audio-rate frequency modulation This article explains the phenomenon of audio-rate frequency modulation of sound, which was explored and used compositionally by John Chowning of Stanford University around 1970. Terms: audio rate, modulation, carrier, modulator, sidebands, reflected sidebands, Bessel function, carrier:modulator ratio, linear (Chowning) or exponential FM. The carrier frequency is not necessarily the fundamental frequency. www.indiana.edu /~emusic/fm/fm.htm   (2969 words)

Rane Professional Audio Reference (F) For audio use the most common electronic filter is a bandpass filter, characterized by three parameters: center frequency, amplitude (or magnitude), and bandwidth. The measure of any audio device's ability to respond to a sine wave program, and therefore is a complex function measuring gain and phase shift (see phasor). Digitized samples of the audio signal serve as inputs, and each filtered output is computed from a weighted sum of a finite number of previous inputs. www.rane.com /par-f.html   (3165 words)

Audio frequency signal generator Two-channel multi-tone audio frequency sinusoidal and noise signal generator is intended for adjusting and measuring parameters of audio equipment. WinPortal.com : Windows Software : Multimedia : Audio frequency signal generator The minimum coefficient of nonlinear and intermodulation distortion, precision, stability and range of frequency are limited only by quality of the used sound card. www.winportal.com /file.asp?ObjectID=12570   (145 words)

Handango Pocket PC Software - Handheld Audio Spectrum Analyzer (HASA) HASA is a handheld audio frequency spectrum analyzer for the Pocket PC 2003 and 2002 devices. Frequency components of sounds picked up by the built-in microphone are shown and analyzed in real-time. The user may choose to average the frequency response data over an extended period of time, and exclude a region of the measured time data in order to remove any observed transient anomalies that may appear. www.handango.com /PlatformProductDetail.jsp?productType=2&optionId=1_2_2&jid=D821BB82C12FX452111352C2285BX13E&platformId=2&siteId=1&productId=26550§ionId=0&catalog=30&txtSearch=hasa   (789 words)

Detecting MP3-Sourced Audio The basic approach to detecting mp3-sourced audio is to run spectral and frequency analysis on some of the wav files. Detecting mp3-sourced audio is not entirely simple or 100% reliable, but there are a couple of reasonably easy things to try. If you decode an mp3 to wav and do a frequency analysis on the wav, you will often see a sudden drop to much lower volume (db) level at around 17-19khz (or on old, bad mp3s, you will see it at much lower frequencies). www.audiohub.org /get/fa/fa.htm   (800 words)

audio frequency. The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. AF A range of frequencies, usually from 15 hertz to 20,000 hertz, characteristic of signals audible to the normal human ear. www.bartleby.com /61/70/A0517000.html   (85 words)

Placette Audio - preamplifiers pre-amps and volume controls I believe these predictions are so much stuff and nonsense (few audiophiles I know are giving up their vinyl, their tuners, even their cassette decks). "According to some audio pundits, the preamplifier is fast becoming a superfluous component. Placette Audio - Guy Hammel (owner) - 682 Granite Way - Boise, Idaho 83712 www.placetteaudio.com   (393 words)

Audio Downloads : Frequency Converter /// AnalogX Freq takes some of the guesswork out of the process, by allowing you to easily convert between frequencies and notes, which can then be used to help target specific areas in the mix. One of the most common problems when you're working with an EQ is identifying exactly what it is you want to tweak. Freq also outputs 'cents' based from A0 (27.5hz), for eq's that do not use named frequencies, and supports fractional notes +/- 50 cents. www.analogx.com /contents/download/audio/freq.htm   (132 words)

ipedia.com: A440 Article Since 1939, it has served as the audio frequency reference for the calibration of pianos, violins, and other musical instruments. A440 is the musical note A above middle C. Since 1939, it has served as the audio frequency reference... The smallest frequency offset that a piano tuner can hear depends on lots of factors, including the sound volume, the duration of the tone, the suddenness of the frequency change, and the musical training of the listener. www.ipedia.com /a440.html   (236 words)

MSN Encarta - Dictionary - audio frequency Search for "audio frequency" in all of MSN Encarta frequency heard by human ear: a frequency that is audible to the human ear, between 20 and 20,000 hertz in people with normal hearing Click here to search all of MSN Encarta encarta.msn.com /encnet/features/dictionary/DictionaryResults.aspx?refid=1861685652   (63 words)

audio frequency on Encyclopedia.com Wireless audio and data using frequency hopping at 2.4 Ghz. Carrier Signal The radio station transmits its audio signal encased in its carrier frequency. Radio Frequency Investigation launches audio testing capability for latest handsets. www.encyclopedia.com /html/X/X-audiofre.asp   (252 words)

SciFi Audio and Frequency science fiction Audio Over the past two years, Frequency Audio has brought you the best in new and classic science fiction, fantasy and horror. And while Frequency has been pleasing to the ears - with the finest in all-digital audio production values - it's also been good for your eyes, with cover art by award-winners like Bob Eggleton. With the advent of the MP3, audio will never be the same, and the music industry is still trying to figure out how to deal with it. www.scifiaudio.com   (445 words)

NPR : Audio Blogs: Online Diarists Sound Off Since audio blogs are relatively new, they don't yet cover the range of their written equivalents. Text blogs have around since the mid-1990s, but audio is just entering the mainstream. But some people are already using audio in creative ways. www.npr.org /templates/story/story.php?storyId=1220496   (619 words)

Audio Frequency The user-interface is based on Qt, while almost all audio functionality is taken directly from ecasound libraries. Unlimited tracks, realtime rendering, and video4linux capture are supported, as well as the audio features you expect from a hard disk recorder. As ecawave is designed for editing large audio files, all processing is done direct-to-disk. www.audio-frequency.com   (464 words)

Audio Terminology Below are the definitions to various audio related words and phrases. its frequency, and in turn the musical pitch of a note. Audio: A term used to describe sounds within the range of www.enjoythemusic.com /magazine/definitions/audioterminology.htm   (3430 words)

Frequency For more info, visit the homepage of Frequency Audio Journal. If you would like to have your work considered for an upcoming issue, please send a recording on an audio CD or standard cassette tape to: We'd like to dedicate this, our first issue, to the memory of Douglas Oliver, the featured reader on this disc, who died in the spring of 2000. www.writing.upenn.edu /pennsound/x/Frequency.html   (290 words)

AF - a Whatis.com definition - see also: audio frequency AF (audio frequency) (also abbreviated af or a.f.) refers to alternating current (AC) having a frequency such that, if applied to a transducer such as a loudspeaker or headset, will produce acoustic waves within the range of human hearing. AF - a Whatis.com definition - see also: audio frequency whatis.techtarget.com /definition/0,,sid9_gci213765,00.html   (187 words)

Shuttle Audio Frequencies The frequencies below may carry shuttle audio during space shuttle missions. Forward any new frequencies, corrections, and verifications to WD4IXI. Most are in the amateur bands, but a few originate from NASA centers. www.amsat.org /amsat/sarex/shutfreq.html   (83 words)

Protek Audio Frequency Generators HC Protek audio generators are the ideal instruments for use in all audio work or other applications where low frequency signals are required. Output to 450MHz is possible using the 3rd Harmonic. Low distortion Sine wave and Square wave output. www.lashen.com /Vendors/protek/AudioGenerators.asp   (60 words)

BKAA43 Valves For Audio Frequency Amplifiers Copyright ©2001 Audio Amateur, Inc. All rights reserved. A Philips publication reprinted by Audio Amateur Press Originally published as part of the Philips series on electronic valves in 1954, this book encourages the amateur and professional amplifier builder to experiment with design elements, not just work from a blueprint. www.audioxpress.com /bksprods/books/bkaa43.htm   (253 words)

AskOxford: audio frequency • noun a frequency capable of being perceived by the human ear, generally between 20 and 20,000 hertz. www.askoxford.com /concise_oed/audiofrequency?view=uk   (101 words)

findvalues.html 107.9) { alert('Enter a frequency between 87.9 and 107.9 MHz.\nDecimal point must be odd, e.g. 89.7\n\n\nThis corresponds to FM channels 200 to 300.'); form1.answer1.value = ''; form1.number.value = ''; } else { if(number2==.2number2==.4number2==.6number2==.8number2==.0) { alert('Frequency value must end in an odd decimal:\n\n.1.3.5.7 or.9\n\n\nThe entered frequency will be increased to the next odd decimal.\n'); form1.number.value = Math.round(form1.number.value * 10. = 2997924561) { alert('Wavelength must be less than 2997924560 meters\nwhich corresponds to 0.0001 kHz (0.1 Hz).\n Please enter a new wavelength value\nafter clearing the Frequency field.'); form9.DFREQ.value = ''; form9.EDEG.value = ''; form9.wavelength_at_freq.value = ''; form9.wavelength_computed.value = ''; form9.answer9.value = ''; } else if(form9.wavelength_at_freq.value www.fcc.gov /mb/audio/bickel/findvalues.html   (748 words)

Audio Frequency - compare prices, reviews and buy at NexTag - Price - Review Audio-Technica Audio Technica ATW2110H UHF frequency agile headworn system ATM75cW... Audio Frequency - compare prices, reviews and buy at NexTag - Price - Review Audio-Technica Audio Technica ATW2110L UHF Frequency Agile Lavalier System AT829cw... www.nextag.com /serv/main/buyer/OutPDir.jsp?search=audio+frequency   (178 words)

AllRefer.com - audio frequency (Electrical Engineering) - Encyclopedia More articles from AllRefer Reference on audio frequency You are here : AllRefer.com > Reference > Encyclopedia > Electrical Engineering > audio frequency AllRefer.com - audio frequency (Electrical Engineering) - Encyclopedia reference.allrefer.com /encyclopedia/X/X-audiofre.html   (119 words)

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