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Browse Prior Art Database

Pulse Detector

IP.com Disclosure Number: IPCOM000095930D
Original Publication Date: 1964-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Cackowski, VH: AUTHOR [+2]

Abstract

When data is transduced from high density tape, the demodulated signals provided by the transducing apparatus have considerable variation in reference level. This pulse detecting circuit accepts these demodulated signals and provides substantially constant output signals. These are independent of any variation in the reference level of the demodulated signals.

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Pulse Detector

When data is transduced from high density tape, the demodulated signals provided by the transducing apparatus have considerable variation in reference level. This pulse detecting circuit accepts these demodulated signals and provides substantially constant output signals. These are independent of any variation in the reference level of the demodulated signals.

The circuit has two parallel channels which accept the demodulated signals. The upper channel includes a phase shifter, an amplifier and level setter. The lower channel comprises an amplifier and level setter. The outputs of the two channels are compared to produce a signal which is independent of the variations in reference level of the input signal.

Thus, if an input signal having an amplitude variable between +V1 and -V2 is supplied to the two channels, the lower channel amplifies and level sets this signal at a predetermined level, e. g., two volts, to provide the A signal. This input signal is phase-shifted in the upper channel and then amplified so that the amplitude of this phase-shifted signal matches the amplitude of the non-phase- shifted signal. The B signal provided by this channel is also level set at a predetermined level, e. g., one volt, with respect to the level established in the lower channel. The A and B signals are compared in the comparator to provide the C output signal every time that the phase-shifted signal becomes more positive than the non-phase-shifted signal.

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