Pulse or digital communications – Repeaters – Testing
Patent
1982-10-25
1988-08-16
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
333 18, 333 28R, 381103, H03H 730
Patent
active
047649380
ABSTRACT:
A circuit and method are provided to compensate for the non-linear delay characteristics of a digital audio system introduced by the systems anti-aliasing filter. The circuit and method provide for introducing time delay to the digital system at the low and mid range frequencies, and adding decreasing amounts of time delay at the high frequency ranges to produce an overall composite time delay for the digital system which is relatively constant over its operating frequency range. The delay equalizer used to achieve such delay compensation is made up of active delay equalizer sections which are non-interactive, and which are independently tunable in terms of each sections center frequency and Q. An active delay equalizer section with a second order bandpass transfer functions has been devised to achieve this capability. It is comprised of an operational amplifier having input resistance and feedback resistance connected to its inverting input and a twin-T network connected in its non-inverting input. The twin-T is a driven twin-T for variable Q, and provides a delay equalizer wherein the time delay of each section can readily be tailored to the designers requirements.
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Beeson Donald L.
Chin Stephen
Meyer Sound Laboratories, Inc.
Safourek Benedict V.
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