| http://www.w3.org/ns/prov#value | - Signals to be processed by the system, such as speech or other audio frequency signals, are delivered to an input at 13 from any of myriad possible sources, such as the output of a microphone, preamplifier, an intermediate amplification stage in a modulation system, or tape recorders, the output of an intermediate frequency stage of an RF transmitter, receiver, etc.
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