Abstract: The presence of a first human fingerprint at the fingerprint scanner. The first human fingerprint is analyzed to determine whether the first human fingerprint has been previously learned by the barrier movement operator. When the first human fingerprint is determined to be previously learned, a first command is sent to actuate a moveable barrier operator. Within a predetermined time period after the first human fingerprint has been determined to be previously learned, the presence of a second human fingerprint is sensed at the fingerprint scanner. Without analyzing the second fingerprint, a second command is sent to actuate the moveable barrier operator. The first fingerprint and the second fingerprint may be from the same or different users.

Abstract: A differential amplifier (701) has an input for coupling to one or more signal sources (702). An offset error correction parameter input (704) is provided proximal to this input and serves to facilitate the reduction or elimination of undesired DC or low frequency offsets while further permitting a relatively large gain to be applied to the incoming signal without also amplifying considerable undesired DC/low frequency offset content.

Abstract: An expert system-controlled defibrillator for delivering precise energy doses to a patient who's heart is in fibrillation. An energy source connects to the patient's chest (during emergency resuscitation) or directly to the heart (during open-heart surgery) and discharges energy in one or more pulses. The apparatus measures a patient-dependent parameter or parameters, and determines, from an expert based system, the waveform morphology and the precise amount of energy to deliver.

Abstract: A medical treatment device includes a plurality of digitally controlled medical treatment modules with a feature authorizing system to enable selected treatment modules in response to the entry and subsequent validation of a user's passcode.

Abstract: Defibrillator capacitors are charged according to duty cycle control implemented by several stages of clocking circuits. A first frequency clocking circuit is reset on demand to introduce additional clock pulses for a fast charge of the capacitors.

Abstract: A discharge resistor is thermally monitored under computer supervisory control. Current flow through the resistor is duty-cycle controlled to prevent thermal damage.