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Software for encoding [[comparison of audio codecs|audio]], [[comparison of video codecs|video]], [[character encoding|text]] into s * A [[data compression|compressor]] encodes data (e.g., audio/video/images) into a smaller form (See [[codec]].)

...[[electronics]]. Amongst their many applications are the separation of an audio signal before application to [[bass (music)|bass]], [[mid-range speaker|mid ...or balanced lines dedicated to the purpose, were used for FDM telegraph at audio frequencies. The first of these systems in the UK was a [[Siemens|Siemens a

...o mechanical components which correspond to their electrical counterparts, transducers are needed to convert between the mechanical and electrical domains. There ...nother patent using the same methodology on telephone transmit and receive transducers.<ref>Harrison, 1930.</ref>