High Frequencies

Some articles on high, frequencies, high frequencies:

Gramophone Record - Limitations - Equalization
... and manufacturing limitations, both high and low frequencies were removed from the first recorded signals by various formulae ... With low frequencies, the stylus must swing a long way from side to side, requiring the groove to be wide, taking up more space and limiting the ... At high frequencies, hiss, pops, and ticks are significant ...
Electronic Filter - Classification By Technology - Passive Filters - T and π Filters
... 'T' or 'π' topology and in either geometries, a low-pass, high-pass, band-pass, or band-stop characteristic is possible ... The high-pass T filter in the illustration, has a very low impedance at high frequencies, and a very high impedance at low frequencies ... in a transmission line, resulting in the high frequencies being passed and low frequencies being reflected ...
Loudness Compensation
... a setting found on some hi-fi equipment and equalisers that increases the level of the high and low frequencies ... the ear's lower sensitivity to extreme high and low frequencies may cause these signals to fall below threshold ... that older speakers needed a boost in bass and the high frequencies to balance losses in the speakers, and sometimes the media itself ...
Turntables - Equalization
... This required very high tracking forces that rapidly wore out both the stylus and the record on lateral cut 78 rpm records ... Because bass sounds have a higher amplitude than high frequency sounds (for the same perceived loudness), the space taken in the groove by low frequency sounds needed to be ... Records are made with boosted high frequencies and reduced low frequencies ...
Oscilloscope - Features and Uses - Description - Probes
... Furthermore, the leads have a high inductance, so they are not suitable for high frequencies ... At low frequencies (where the resistance of R is much less than the reactance of C), the circuit looks like a resistive divider at high frequencies (resistance much greater than reactance), the circuit ... The result is a frequency compensated probe for modest frequencies that presents a load of about 10 megohms shunted by 12 pF ...

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