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. For example, radio receivers generally include a tunable band-pass filter with a passband that is wide enough to accommodate the bandwidth of a single station. Telecommunication is the extension of communication over a distance. ... See also list of optical topics. ... Acoustics is a branch of physics and is the study of sound, mechanical waves in gases, liquids, and solids. ... For limiting related to the Law of the Minimum, see limiting factor. ... Loss has several meanings including: Loss in electronics is the ratio of the system output to system input In electronics, loss is the ratio of system output to system input. ... Electronics In electronics, gain is usually taken to meaning the ratio of the signal output of a system to the signal input of the system. ... The frequency axis of this symbolic diagram would be logarithmically scaled. ...

Passbands are found in many systems outside of telecommunications. For example, most traditional musical instruments are tunable sonic band-pass filters with narrow passbands. Woodwind instruments such as the flute and penny whistle are good examples: the flute is stimulated by broad-band sonic noise at the mouthpiece but resonates only in a narrow passband around the fingered note. Overblowing a flute (that is, playing higher notes with the same fingering as a lower note) is possible because the flute has multiple passbands for any given fingering: the note that emerges is dependent on both the fingering and the spectrum of wind noise at the mouthpiece. The frequency axis of this symbolic diagram would be logarithmically scaled. ... A woodwind instrument is a musical instrument in which sound is produced by blowing through a mouthpiece against an edge or by a vibrating reed, and in which the pitch is varied by opening or closing holes in the body of the instrument. ... This article pertains to the musical instrument. ... Tin whistles in a variety of makes and keys The tin whistle, also called the flageolet, pennywhistle, Irish whistle, or simply whistle, is a simple six-holed breath instrument. ... Mouthpiece was a straight edge hardcore punk band that featured Tim McMahon on vocals. ... Overblowing is producing a different note in a wind instrument by forcing air harder. ... Mouthpiece was a straight edge hardcore punk band that featured Tim McMahon on vocals. ...

In general, there is an inverse relationship between the width of a filter's passband and the time required for the filter to respond to new inputs: broad passbands yield faster response. This is a consequence of the mathematics of Fourier analysis. Mathematics is the study of quantity, structure, space and change. ... Harmonic analysis is the branch of mathematics which studies the representation of functions or signals as the superposition of basic waves. ...

Note 1: The limiting frequencies are defined as those at which the relative intensity or power decreases to a specified fraction of the maximum intensity or power. This decrease in power is often specified to be the half-power points, i.e., 3 dB below the maximum power. In physics, intensity is a measure of the time-averaged energy flux. ... Mechanical power In physics, power (symbol: P) is the amount of work W done per unit of time t. ... Although it is widely used as a measure of the loudness of sound, the decibel (dB) is more generally a measure of the ratio between two quantities, and can be used to express a wide variety of measurements in acoustics and electronics. ...

Note 2: The difference between the limiting frequencies is called the bandwidth, and is expressed in hertz (in the optical regime, in nanometers or micrometers). // Analog For analog signals, bandwidth is the width, usually measured in hertz, of a frequency band f2 − f1. ... The hertz (symbol Hz) is the SI unit of frequency. ...

Note 3: The related term "bandpass" is an adjective that describes a type of filter or filtering process; it is frequently confused with "passband", which refers to the actual portion of affected spectrum. The two words are both compound words that follow the English rules of formation: the primary meaning is the latter part of the compound, while the modifier is the first part. Hence, one may correctly say 'A dual bandpass filter has two passbands'. The frequency axis of this symbolic diagram would be logarithmically scaled. ... A compound is a word (lexeme) that consists of more than one free morpheme. ...

Source: original from Federal Standard 1037C and from MIL-STD-188 Federal Standard 1037C entitled Telecommunications: Glossary of Telecommunication Terms is a U.S. Federal Standard, issued by the General Services Administration pursuant to the Federal Property and Administrative Services Act of 1949, as amended. ... MIL-STD-188 is a series of U.S. military standards relating to telecommunications. ...

See also

• Stopband