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Page "MOS Technology SID" ¶ 112
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ReSID and .
GoatTracker allows you to write music using modern OS's and uses the ReSID engine.

filter and distortion
While there is currently no consensus on how to categorize effects, the following are seven common classifications: distortion, dynamics, filter, modulation, pitch / frequency, time-based and feedback / sustain.
# Equalization filtering, for example a matched filter, compensation for multipath propagation, time spreading, phase distortion and frequency selective fading, to avoid intersymbol interference and symbol distortion.
If F is a linear function, for instance a filter whose gain and / or delay varies with frequency, then the signal will experience linear distortion.
In a filter, group delay tends to peak near the cut-off frequency, resulting in pulse distortion.
The distortion of a waveform relative to a pure sinewave can be measured either by using a wave analyser to analyse the output wave into its constituent harmonics and noting the amplitude of each relative to the fundamental ; or by cancelling out the fundamental with a notch filter and measuring the remaining signal, which will be total aggregate harmonic distortion plus noise.
Analog signals that have not already been bandlimited must be passed through an anti-aliasing filter before conversion, to prevent the distortion that is caused by audio signals with frequencies higher than the Nyquist frequency, which is half of the system's sampling rate.
This phase distortion can create the perception of a " ringing " sound around the filter band, or other coloration.
The main reason for this is that the filter produces strong distortion that is sometimes used to produce simulation of instruments such as a distorted electric guitar.
In addition to nonlinearities in filter, the D / A circuitry used in the waveform generators produces yet more additional distortion that made its sound richer in character.
In 2008, Antti Lankila significantly improved the filter and distortion simulation in reSID.
If the signals are wideband, this will cause aliasing distortion, so it is common to oversample the operation or low-pass filter the signals prior to ring modulation.
An alternative technique, total harmonic distortion measurement, cancels out the fundamental with a notch filter and measures the total remaining signal, which is total harmonic distortion plus noise ; it does not give the harmonic-by-harmonic detail of an analyser.
Alligator also is capable of adding delay, distortion, phasing and stereo panning effects to each channel, and each of the filters can be modulated with a filter envelope embedded in the unit.
To filter this noise, the high-frequency response of theatre playback systems was deliberately curtailed … To make matters worse, to increase dialogue intelligibility over such systems, sound mixers were recording soundtracks with so much high-frequency pre-emphasis that high distortion resulted.
ReBirth also features mixers, a pattern controlled filter ( PCF ) and some of the standard effects in software synthesizers like delay, compressor and distortion.
After feeding the equipment under test with low distortion input sinewaves, the output distortion can be measured by using a electronic filter to remove the original frequencies, or spectral analysis may be made using Fourier Transformations in software or a dedicated spectrum analyser, or when determining intermodulation effects in communications equipment, may be made using the receiver under test itself.
Kaufman had been known to lament what he regarded as the distortion of judicial opinion and finding, as it passed through the filter of the media: " The judge is forced for the most part to reach his audience through the medium of the press whose reporting of judicial decisions is all too often inaccurate and superficial.
showing the distortion of a returned pulse due to the receiver matched filter ( commonly, but not exclusively, used in pulse compression radar ) due to the Doppler shift of the return from a moving target.
By contrast, a filter with non-linear phase has a group delay that varies with frequency, resulting in phase distortion.
When distortion due to clipping occurs after the anti-aliasing filter, it can create components outside the passband of the anti-aliasing filter ; these components can then alias, causing the reproduction of other non-harmonically-related frequencies.

filter and patch
* NN-XT: an advanced sampler, which features the option of tweaking the various modulation, oscillation, and filter parameters of a preloaded sample or patch
Although the MS-20 follows a conventional subtractive synthesis architecture of oscillators / filter / vca, its patch panel allows some rerouting of both audio and modulation, and it includes an external signal processor.

filter and improve
Melitta continued to develop new techniques to improve the shape, performance, material and production process of the Melitta filter systems.
The Comprehensive Everglades Restoration Plan ( CERP ) proposed more than 60 construction projects over 30 years to store water that was being flushed into the ocean, in reservoirs, underground aquifers, and abandoned quarries ; add more Stormwater Treatment Areas to filter water that flowed into the lower Everglades ; regulate water released from pumping stations into local waterways and improve water released to Everglades National Park and Water Conservation Areas ; remove barriers to sheetflow by raising the Tamiami Trail and destroying the Miami Canal, and reuse wastewater for urban areas.
Modern systems with point-to point links use broadcast methods with snoop filter options to improve performance.
Some cassette decks have a MPX filter to improve the sound quality and the tracking of the noise reduction system when recording from a FM stereo broadcast.
Marshes also improve water quality by acting as a sink to filter pollutants and sediment from the water that flows through them.
* Oversampling is a way to improve the performance of the low pass filter present at the output of most CD players.
Crystal filter design continued to improve in the 1970s and 1980s with the development of multi-pole monolithic filters, widely used today to provide IF selectivity in communication receivers.
Many ground-based radars exploit Doppler filter to improve sensitivity to objects having a radial velocity component with respect to the radar.
Laminated door glass also became available to deter break-ins and thefts, reduce road and wind noise, improve protection from flying glass in a collision and filter out ultraviolet rays, reducing heat buildup and fading of the interior.
Neon indicator lamps are normally orange, and are frequently used with a coloured filter over them to improve contrast and change their colour to red or a redder orange, or less often green.
Amplifiers included in a filter design can be used to improve the performance and predictability of a filter, while avoiding the need for inductors ( which are typically expensive compared to other components ).
The buffer bootstraps the " bottom " of the component to the output of the filter, which will improve upon the simple two divider case.
However, in 2002 Paul Graham was able to greatly improve the false positive rate, so that it could be used on its own as a single spam filter.
Homomorphic filtering is used in the log-spectral domain to separate filter effects from excitation effects, for example in the computation of the cepstrum as a sound representation ; enhancements in the log spectral domain can improve sound intelligibility, for example in hearing aids.
The fuel tank is located below the saddle ( the tank at the usual location is actually the cover for the air filter ) to improve the riding behaviour.
The full-sized cars were the beginning of a " corporate-wide " downsizing of vehicles in order to improve fuel economy ratings following the 1973-74 energy crisis that would filter down to intermediates in 1978, personal-luxury cars in 1979 and compacts in 1980 with subsequent downsizings of each line of vehicles scheduled in subsequent years.
It is important to note that HEPA filters filter to 0. 3 Microns and help to eliminate larger particles but are not certified through the FDA to improve indoor air quality.
Reducing receiver filter size below average amount of FM transmit noise will not improve range performance.
More elements are needed when it is desired to improve some parameter of the filter such as stop-band rejection or slope of transition from pass-band to stop-band.
The screenshot was slightly edited to improve quality, mostly a filter to remove JPEG artifacts.
CDSS used during diagnoses help review and filter the physician ’ s preliminary diagnostic choices to improve their final results.
This allows the use of one air filter instead of many, and allows the designers to exploit the properties of air to improve performance.
Edge enhancement is an image processing filter that enhances the edge contrast of an image or video in an attempt to improve its acutance ( apparent sharpness ).

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