A crystal filter is an electronic filter that uses the mechanical resonance of piezoelectric crystals, usually quartz, to shape a circuit's frequency response. Its early development was driven by carrier telephony, which required steep filters to separate voice channels spaced just a few kilohertz apart.
A crystal filter is an electronic filter that uses the mechanical resonance of piezoelectric crystals, usually quartz, to shape a circuit's frequency response. Its early development was driven by carrier telephony, which required steep filters to separate voice channels spaced just a few kilohertz apart.
Source: Wikipedia "Crystal filter" · CC BY-SA 4.0
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