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An audio filter is a type of filter used for processing sound signals. Many types of filters exist for applications including graphic equalizers, synthesizers, sound effects, CD players and virtual reality systems. In electronics and signal processing, a filter is a device or process that modifies a signal. ...
A schematic representation of hearing. ...
In information theory, a signal is the sequence of states of a communications channel that encodes a message. ...
In audio processing, equalization (EQ) is the process of modifying the frequency envelope of a sound. ...
A synthesizer (spelling var. ...
Sound effects or audio effects are artificially created or enhanced sounds, or sound processes used to emphasize artistic or other content of movies, video games, music, or other media. ...
The Compact Disc logo was inspired by that of the previous Compact Cassette. ...
Virtual Reality (VR) is an environment that is simulated by a computer. ...
In its simplest form, an audio filter is typically designed to pass some frequency regions through unattenuated while significantly attenuating others. In some applications, such as in the design of graphic equalizers or CD players, the filters are designed according to a set of objective criteria such as pass band, pass band attenuation, stop band, and stop band attenuation, where the pass bands are the frequency ranges for which audio is attenuated less than a specified maximum, and the stop bands are the frequency ranges for which the audio must be attenuated by a specified minimum. An audio frequency (abbreviation: AF) is any frequency from about 20 hertz to about 20 kilohertz, which is the approximate range of sound frequencies that is audible to humans. ...
Attenuation is the decrease of the amount, force, magnitude, or value of something. ...
Usually considered in the context of the applied arts, engineering, architecture, and other such creative endeavours, design is used as both a noun and a verb. ...
In audio processing, equalization (EQ) is the process of modifying the frequency envelope of a sound. ...
In telecommunications, optics, and acoustics, passband is the portion of spectrum, between limiting frequencies (or, in the optical regime, limiting wavelengths), that is transmitted with minimum relative loss or maximum relative gain by a filtering device. ...
Sine waves of various frequencies; the lower waves have higher frequencies than those above. ...
In more complex cases, an audio filter can provide a feedback loop, which introduces resonance (ringing) alongside attenuation. Audio filters can also be designed to provide gain (boost) as well as attenuation. Audio feedback (also known as the Larson effect) is a special kind of feedback which occurs when a loop exists between an audio input (for example, a microphone or guitar pickup) and an audio output (for example, a loudspeaker). ...
The Tacoma Narrows Bridge (shown twisting) in Washington collapsed spectacularly, under moderate wind, in part because of resonance. ...
In other applications, such as with synthesizers or sound effects, the aesthetic of the filter must be evaluated subjectively.
Audio filters can be implemented in analog circuitry as analog filters or in DSP code or computer software as digital filters. An analog filter handles analog stimuli (e. ...
Digital signal processing (DSP) is the study of signals in a digital representation and the processing methods of these signals. ...
Computer software (or simply software) refers to one or more computer programs and data held in the storage of a computer for some purpose. ...
An FIR filter In electronics, a digital filter is any electronic filter that works by performing digital math operations on an intermediate form of a signal. ...
Non-linear filters are also used in audio applications: for example, compressors, fuzz boxes, ring modulators. Audio level compression, also called compression or limiting, is a process that manipulates the dynamic range of an audio signal. ...
A 1965 Gibson Maestro Fuzz Tone FZ-1A, one of the first commercially available fuzz boxes. ...
Ring modulation is an audio effect performed by multiplying two audio signals, where one is typically a sine-wave or another simple waveform. ...
Generically, the term 'audio filter' can be applied to mean anything which changes the timbre, harmonic content, pitch or waveform of an audio signal. In music, timbre, also timber, (French, IPA /tæmbər/ as in the first two syllables of tambourine) is the quality of a musical note or sound which distinguishes different types of sound production or musical instruments. ...
In acoustics and telecommunication, the harmonic of a wave is a component frequency of the signal that is an integer multiple of the fundamental frequency. ...
Pitch may refer to: Pitch is the property of a sound or musical tone measured by its perceived frequency Pitch, or tone of voice, refers to variation of tone in tonal language, and in languages with melodic accent Pitch, a throw of a baseball by a pitcher Pitch, part of...
Waveform quite literally means the shape and form of a signal, such as a wave moving across the surface of water, or the vibration of a plucked string. ...
Analog audio filters typically limit lower frequency range to about 100-600 Hertz. This is done to prevent damage to the speaker due to high energy lower frequencies (This is why Base sounds can actually produce thumping sound). Higher frequencies could also be filtered at around 20 kilo-hertz to prevent mixing with other higher frequencies signals in a system. Sine waves of various frequencies; the lower waves have higher frequencies than those above. ...
The hertz (symbol: Hz) is the SI unit of frequency. ...
External links
- Software Analog Filter emulators by musicrow
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