Abstract
Dictating apparatus is enhanced for normal and conference speech recording by simple circuitry for detecting "long periods of silence" and compressing the record during these periods, as for example by discontinuing the recording process. Starting and stopping the recording transducing apparatus is a basic concept. Conventional recording apparatus is adapted to function under control of circuitry using available digital circuit modules. Analog speech and like waves are converted to incremental digital form by delta modulating circuitry. "Silence periods" are recognized by digital sensing circuitry coupled to triggering logical control circuitry for operating the recording apparatus only in the presence of desired sound. Basically a predetermined series of indications of "silence" serve to trigger a latching flip-flop circuit for disabling substantially conventional dictating apparatus and the like until the desired sound resumes and the latching circuit is reset for continuing the recording of dictation. The same subcircuitry is applicable to analog or digital recording apparatus. Several embodiments are described within respect to additional desirable features.
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