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A frequency band in which the attenuation of a filter is essentially zero.



the frequency range within which the amplitude-frequency characteristic of an acoustic, radio-engineering, or optical device is sufficiently uniform to assure the transmission of a signal without substantial distortion of the signal’s shape.

The basic parameters of a passband are the width of the band and the nonuniformity of the amplitude-frequency characteristic within the band. The bandwidth is usually defined as the difference between the upper and the lower limiting frequencies of the section of the amplitude-frequency curve where the minimum amplitude of the oscillations is not less than 0.707, or Passband, of the maximum amplitude. The nonuniformity of the amplitude-frequency curve quantitatively characterizes the degree to which the curve deviates from a straight line parallel to the frequency axis. The bandwidth is expressed in frequency units, such as hertz (Hz), and nonuniformity is expressed in relative units or in decibels.

The passband required for a particular device depends on the device’s purpose. For example, telephone systems require band-widths of 300 to 3400 Hz, high-quality reproduction of musical performances requires 30 to 16,000 Hz, and television broadcasting uses bandwidths of up to 8 MHz. The widening of a passband permits the transmission of a greater amount of information; by reducing the nonuniformity of the amplitude-frequency characteristic within the passband, the reproduction of the shape of the transmitted signal can be improved. Passbands are sometimes defined also in terms of the device’s phase-frequency characteristic.


Gonorovskii, I. S. Radiotekhnicheskie tsepi i signaly. 2nd ed. Moscow, 1971.

A. S. Grinchik

References in periodicals archive ?
The pass-band ripple characteristic of LP response is preserved through the transformation process.
Goknar, "Pole frequency and pass-band gain tunable novel fully-differential current-mode all-pass filter", in Proc.
It can be seen that the measured group delay in the pass-band is about 0.
Firstly, we anticipated very early on by placing broadband at the heart of our company strategy from the beginning of the 21st century and this allowed us to make major investments over the years to acquire an IP network that now covers almost 100 % of the fixed line network and to gradually introduce all the modern broadband technologies (ADSL, CDMA, EDGE and 3G), while increasing our international pass-band to 4.
In standard narrowband VoIP calls, the voice signal is sampled at 8,000 times per second, resulting in an effective voice pass-band of about 200 to 3,300 Hz.
According to the company, the voice signal in typical narrowband VoIP calls is sampled at 8,000 Hz, consequently the effective voice pass-band is approximately 200 to 3,300 Hz.
If you try to do something a filter cannot, such as design a low-pass filter with the same pass-band upper frequency and stop-band lower frequency, an error "balloon" alerts you to the problem.
For example, I work in a department that's part of an electromagnetic interference testing laboratory, and I checked on the words passband for spelling (pass band versus pass-band versus passband) and wobbulate for meaning.
This is considered unlikely in light of the findings cited earlier that the pass-band width is wider in binaural listening than in monaural situations.
The power spectrum of this noise shows a relatively broad pass-band matching the dynamic transfer-function for sinusoidally modulated light (4).
Our paper focuses on the filtering solution that allows reconnection-less and switch-less control of the type of the transfer function electronically by the parameter(s) of advanced active element and also tuning of the stop-band and/or pass-band attenuation.