The analog output is connected to a low-pass filter, which filters out high-frequency aliases when the Amiga is using a lower sampling rate ( see Nyquist limit ).

The brightness of the Amiga's power LED is used to indicate the status of the Amiga's low-pass filter.

In case of a low-pass filter or baseband signal, the bandwidth is equal to its upper cutoff frequency.

As an example take a simple low-pass RC filter.

In order to remove aliasing, all rendering algorithms ( if they are to produce good-looking images ) must use some kind of low-pass filter on the image function to remove high frequencies, a process called antialiasing.

The output pulses contain inaccurate spectral components ( that is, the pulse frequency and its harmonics ) which must be removed by a low-pass passive filter.

For instance, if all of the coefficients were equal to unity, a so-called boxcar function, then it would implement a low-pass filter with a low frequency gain of N + 1 and a frequency response given by the sinc function.

* DSL filter, a low-pass filter installed between analog devices and a telephone line

The Amiga contains an analog low-pass filter ( reconstruction filter ) which is external to Paula.

The filter is a 12 dB / oct Butterworth low-pass filter at approximately 3. 3 kHz.

Models released before Amiga 1200 also have a static " tone knob " type low-pass filter that is enabled regardless of the optional " LED filter ".

This filter is a 6 dB / oct low-pass filter with cutoff frequency at 4. 5 or 5 kHz.

Basic radiosity also has trouble resolving sudden changes in visibility ( e. g., hard-edged shadows ) because coarse, regular discretization into piecewise constant elements corresponds to a low-pass box filter of the spatial domain.

In 1966, Moog filed a patent application for his unique low-pass filter, issued in October, 1969.

While subtractive synthesis can be applied to any source audio signal, the sound most commonly associated with the technique is that of analog synthesizers of the 1960s and 1970s, in which the harmonics of simple waveforms such as sawtooth, pulse or square waves are attenuated with a voltage-controlled resonant low-pass filter.

# We then pass the sound through a shallow low-pass filter:

The upper frequency limit in humans ( approximately 20 kHz ) is due to limitations of the middle ear, which acts as a low-pass filter.

This is usually accomplished by means of a suitable low-pass filter ; for example, if it is desired to sample speech waveforms at 8 kHz, the signals should first be lowpass filtered to below 4 kHz.

When software rescales an image ( the same process that creates the thumbnail shown in the lower image ) it, in effect, runs the image through a low-pass filter first and then downsamples the image to result in a smaller image that does not exhibit the moiré pattern.

The outputs of these low-pass filters are inputs to another phase detector, the output of which passes through noise-reduction filter before being used to control the voltage-controlled oscillator.

A low-pass filter is an electronic filter that passes low-frequency signals but attenuates ( reduces the amplitude of ) signals with frequencies higher than the cutoff frequency.

A filter in which the signal passes through an inductor, or in which a capacitor provides a path to ground, presents less attenuation to low-frequency signals than high-frequency signals and is therefore a low-pass filter.

One solution to the problem is to operate with a low loop gain and to include low-pass filters.

* Treble-cut or low-pass filter, which attenuates high frequencies while passing low frequencies

An optical filter could correctly be called low-pass, but conventionally is described as " longpass " ( low frequency is long wavelength ), to avoid confusion.

If there is a frequency ( usually a high frequency ) where the phase shift reaches 180 °, then the designer must ensure that the amplifier gain at that frequency is very low ( usually by low-pass filtering ).

A second-order low-pass filter with a very low quality factor has a nearly first-order step response ; the system's output responds to a step input by slowly rising toward an asymptote.

It is an " ideal " low-pass filter in the frequency sense, perfectly passing low frequencies, perfectly cutting high frequencies ; and thus may be considered to be a brick-wall filter.

Low frequency content below the low-pass part of the crossover filter is sent to a circuit where harmonics are synthesized above the low notes.

Likewise, for the illustrated low-pass π filter, the circuit can be connected to a transmission line, transmitting low frequencies and reflecting high frequencies.

For the same reason, the output of a DAC requires a low-pass analog filter, called a reconstruction filter, as the output signal must be bandlimited, to prevent aliasing ( here meaning Fourier coefficients being reconstructed as low frequency waves, not as higher frequency aliases ), as in the Whittaker – Shannon interpolation formula.

The analog optical image intensity function which is sampled by the sensor device is not in general bandlimited, and the non-ideal sampling is itself a useful type of low-pass filter, though not always sufficient to remove enough high frequencies to sufficiently reduce aliasing.

On the subscriber's end of the circuit, inline low-pass DSL filters ( splitters ) are installed on each telephone to filter the high-frequency " hiss " that would otherwise be heard, but pass voice ( 5 kHz and below ) frequencies.

Loading coils inserted periodically in series with a pair of wires reduce the attenuation at the higher voice frequencies up to the cutoff frequency of the low-pass filter formed by the inductance of the coils ( plus the distributed inductance of the wires ) and the distributed capacitance between the wires.

The stopband of a low-pass filter is the frequencies from the stopband corner frequency ( which is slightly higher than the passband 3 dB cut-off frequency ) up to the infinite frequency.

In addition, many amplifiers include an adjustable low-pass filter, which prevents undesired higher frequencies from reaching the subwoofer driver.

A stiff physical barrier tends to reflect higher sound frequencies, and so acts as a low-pass filter for transmitting sound.

In an electronic low-pass RC filter for voltage signals, high frequencies contained in the input signal are attenuated but the filter has little attenuation below its cutoff frequency which is determined by its RC time constant.

An ideal low-pass filter completely eliminates all frequencies above the cutoff frequency while passing those below unchanged: its frequency response is a rectangular function, and is a brick-wall filter.

If the transfer function of a first-order low-pass filter has a zero as well as a pole, the Bode plot will flatten out again, at some maximum attenuation of high frequencies ; such an effect is caused for example by a little bit of the input leaking around the one-pole filter ; this one-pole – one-zero filter is still a first-order low-pass.

The quantization noise at these high frequencies is removed or greatly attenuated by use of an analog low-pass filter at the output ( sometimes a simple RC low-pass circuit is sufficient ).

If the chosen anti-aliasing filter ( a low-pass filter in this case ) has a transition band of 2000 Hz, then the cut-off frequency should be ≤ 20050 Hz to yield a signal with negligible power at frequencies ≥ 22050 Hz and complete pass of frequencies ≤ 20 kHz ( within the human hearing range ).

* VCF-Voltage Controlled Filter, which attenuates frequencies below ( high-pass ), above ( low-pass ) or both below and above ( band-pass ) a certain frequency.

A low-pass filter removes the higher frequencies, while a band-pass filter removes all frequencies except the particular range of interest.

Because of that, very steep low-pass filters are used on frequencies above 20 kHz ( the theoretical limit of human hearing ) that may introduce slight distortions into the audible-range signal.