Abstract: A micro cassette recorder-player is disclsoed having capactity for increased signal-to-noise ratio by utilizing a mobile capstan which pulls tape out of a micro cassette and across an enlarged head placed distal to and shielded from all electric motors, solenoids, and inductors which typically create spurious electric and magentic flux fields that traditionally diminish S/N.

Abstract: A method for large scale and economical manufacture of a second surface optical recording disk is disclosed. An optically transparent disk cover with tracking grooves and data etched on a mating side thereof is mated and embossed into an optically reactive layer of a first surface optical recording laminate web or sheet having an optically active layer, a reflective layer and a web support layer. The second surface optical recording device thereby created is then cut from the laminate web to yield a very inexpensive second surface optical recording disk.

Abstract: A process for manufacture of a second surface optically recordable disc having ultraviolet (UV) inhibiting characteristics is disclosed. A reflective lamina of aluminum, superimposed on a glass lamina substratum, is flow process produced by pyrolysis and precipitation of a lamina of aluminum from gasified triisobutyl aluminum onto a lamina web of silicate (amorphous glass) which is concomitantly pyrolized from tetraethoxy silane, with or without alkoxide additives, and precipitated upon a flowing body of molten tin to form a composite lamination sheet. To complete the process, an optically active lamina which is applied over the reflective lamina is embossed with optically transparent ultraviolet (UV) inhibiting polycarbonate, protective covers, the mating surface of which, may be, pregrooved and coded to form second surface optically active media. Covers with bonded lamination are then successively severed from the laminated sheet to yield independent second surface optically recordable media.

Abstract: A process for manufacture of a second surface optically recordable disk is disclosed. A reflective sheet of aluminum, flow process produced by precipitation of a layer of aluminum from gasified triisobutyl aluminum onto a layer of molten indium, is mated with a polymer substratum sheet. In completion of the process, an optically active layer which is applied over the reflective layer is embossed with an optically transparent polycarbonate, protective cover, the mating surface of which, may be, pregrooved and coded with data relative to address and sector codes. Covers with bonded laminae are then successively severed from the lamina sheet to yield independent second surface optically recordable media.

Abstract: A system for detection, measurement, analysis and plotting of electrocardiographic signals with amplitudes ranging down to one microvolt (micropotentials) employing long term ambulatory (Holter) recordings. Multi-channel electrocardiograms are recorded on a Holter recorder that inscribes calibration pulses at the beginning of each tape. The tape is played back at high speed on a scanner which uses the recorded calibration pulses to automatically calibrate the signal gains for each signal channel. The played back signals are digitized at sufficient resolution and sampling rate to permit analysis of micropotentials. The digitized raw data is stored in a permanent computer file available for multiple further analyses. A template heart beat is designated and the raw data file is signal averaged to reduce random noise.

Abstract: A remote scoring system for an air-to-ground strafing range is disclosed which utilizes a pair of vector sensors for each target to pinpoint a target hit and/or miss by means of shell shock wave amplitude and time of arrival (TOA) differentials of the shock wave between the two sensors. The invention also encompasses at least one down range cease-fire sensor that utilizes a TOA of the shell shock wave and its respective muzzle blast to determine a ceasefire distance from the target. Unique signal processing of data is designed for immediate display and/or printout.

Abstract: The specification discloses a self propelled stress testing apparatus for providing graded levels of exercise and for measuring human energy output. An adjustable frictional load calibrated in terms of patient weight and operatively coupled to a pair of translational platforms provides the exercising drag force to a flywheel against which the effort of the user is applied. Reciprocal exercising motion applied to the translational platforms is converted into rotary motion via a pair of unidirectional sprockets. Alternative embodiments employing bifilar and elastically centered slideable guide platform configurations are disclosed as well as special adaptions for use in a weightless space environment.

Abstract: The specification discloses an exercise treadmill for diagnostic and therapeutic purposes incorporating an improved drive and control system. High efficiency at low rpm is effectuated through the use of a DC motor which maintains the belt speed constant by varying the width of the applied pulse duration as a function of load. Additional load buffering between the belt and motor is effectuated by a double flywheel configuration.

Abstract: An opto-electronic end-of-tape sensor has a pulsed light source for producing high intensity, short duration light pulses and a photodetector controlling a clock driven digital counter. In a normal condition with tape blocking the light pulses, the counter is kept in a reset state. If a clear light path of sufficient time duration is detected the photodetector output enables the counter to reach a predetermined count to obtain an end-of-tape signal output. The sensor circuit discriminates against pinholes in the tape by requiring detection of an uninterrupted predetermined number of light pulses to generate the end-of-tape signal.

Abstract: A system for ambulatory monitoring and subsequent analysis and evaluation of pacemaker performance includes a recorder module which detects pacemaker spikes and in response to each spike generates a signal having a waveform compatible with commericially-available ambulatory ECG recorders, to permit ECG signals to be recorded in one channel of the recorder while simultaneously the pacemaker spike signals are recorded in another channel. The magnetic tape on which the signals are recorded is played back at 120 times the recording speed, typically, on a commercially-available playback analyzer which presents the pacemaker and ECG signals as separate outputs. The system further includes an analysis module connected to the playback unit and receiving from it the ECG signals and the pacemaker spike signals. The analysis module has counters which accumulate the number of paced beats and of fusion beats. The analysis module also includes circuits for sensing manifestations of pacemaker malfunction.

Abstract: An improved system for displaying annotated physiological signals processes the signals for two dimensional display on an oscilloscope, for annotation with time-of-day and patient information, and for marking relative to a plurality of detected, abnormal physiological events. The physiological signal is traced during a first time interval after which the time-of-day and patient information is annotated appropriately on the display during a second time interval. During a third time interval, the display is marked to identify those physiological events which have been detected by the system as being abnormal. The display is created with maximum fidelity and without loss of signal information by this three pass process. Two independent channels of physiological signals are displayed on alternate horizontal lines in the display, again without loss of signal fidelity, by tracing the first channel during a first sweep and simultaneously storing the second channel within a memory for display during a second sweep.

Abstract: The system enables ambulatory monitoring of a patient's blood pressure and heart rate without the need for the patient to wear a portable magnetic tape recorder. The system takes the place of the tape recorder. ECG electrodes and a blood pressure cuff are affixed to the patient and are connected to a blood pressure measuring apparatus worn by the patient. The Data Acquisition and Storage System (DAS) is connected to the blood pressure measuring apparatus and includes a solid state storage device in which the successive measurements are stored. After the monitoring session, which may last 24 hours, the patient returns to the clinic, where the DAS is connected to a stationary charter that prints and plots the stored data in tabular and graphical form. The DAS includes a clock for determining the time of day at which the successive blood pressure readings are taken, and these times are stored along with the data.

Abstract: An improved system for displaying annotated physiological signals processes the signals for two-dimensional display on an oscilloscope, for annotation with time-of-day and patient information, and for marking relative to a plurality of detected, abnormal physiological events. The physiological signal is traced during a first time interval after which the time-of-day and patient information is annotated appropriately on the display during a second time interval. During a third time interval, the display is marked to identify those physiological events which have been detected by the system as being abnormal. The display is created with maximum fidelity and without loss of signal information by this three pass process. Two independent channels of physiological signals are displayed on alternate horizontal lines in the display, again without loss of signal fidelity, by tracing the first channel during a first sweep and simultaneously storing the second channel within a memory for display during a second sweep.

Abstract: A single-beam CRT printer, used as a validator record of electrocardiographic data played back from a magnetic tape at a much higher speed than the speed at which it was recorded, includes a scan circuit for generating signals for steering the beam alternately through an ECG scan pattern and through a character scan pattern and further includes a character generator for modulating the intensity of the beam in relation to the instantaneous location of the beam within the character scan pattern to cause the beam to print characters, the intensity of the beam and its linear velocity being increased during execution of the character scan pattern to permit the characters to be printed at such a high speed that only an insignificant part of the ECG plot is omitted while the characters are being printed.

Abstract: Apparatus for printing alpha-numeric characters for plotting an incoming signal at rates on the order of one page every seven seconds for rapidly verifying that the system producing the incoming signal is operating properly. Both printing and plotting are done by styli mounted on a moving carriage and individually electrified to produce marks on a specially prepared paper. The stylii are moved back and forth across the paper, marking in both directions. The carriage is not stepped across the page, but instead is moved smoothly from one side to the other side under control of a velocity servo. A controller generates and applies velocity command inputs to the servo, based on the position of the carriage as sensed by an optical encoder, and based on certain characteristics of the incoming signal. A first buffer memory accumulates the incoming signal until a line has been stored for plotting, while a second buffer memory is applying its accumulated contents to the printhead.

Abstract: Apparatus for printing alpha-numeric characters for plotting an incoming signal at rates on the order of one page every seven seconds for rapidly verifying that the system producing the incoming signal is operating properly. Both printing and plotting are done by styli mounted on a moving carriage and individually electrified to produce marks on a specially prepared paper. The styli are moved back and forth across the paper, marking in both directions. The carriage is not stepped across the page, but instead is moved smoothly from one side to the other side under control of a velocity servo. A controller generates and applies velocity command inputs to the servo, based on the position of the carriage as sensed by an optical encoder, and based on certain characteristics of the incoming signal. A first buffer memory accumulates the incoming signal until a line has been stored for plotting, while a second buffer memory is applying its accumulated contents to the printhead.

Abstract: A computer controlled method and apparatus for displaying an electrocardiograph utilizes a computer to store and display multiple channels of an ECG signal and to develop an AVSEP and arrhythmic display. A video ECG signal is stored in memory and the R waves of the ECG complexes are detected to form an R wave pulse train. Intervals of ECG memory are displayed from adresses representing a few cycles of the ECG signal. The display of the ECG signal is triggered by a corresponding R pulse train which is stored in an address which is offset sufficiently from the address of the ECG signal so that the entire ECG complex is displayed. The method and apparatus has the option wherein the display may be switched from a time moving scan display mode to a time stationary display mode over a fixed or variable interval of scanned ECG signals.

Abstract: Magnetic tape transport using DC current drive variable speed motors directly coupled to take-up and supply reels between which a tape is moved under tension. A crystal controlled PLL is referenced to a tape reference signal during steady speed operation and to a tape drive tachometer signal during start, stop and speed change cycles. The PLL controls the take-up motor drive amplifier which has a current drive output for developing motor torque. A second tension servo loop controls the supply reel motor drive amplifier which also supplies a current drive amplifier to develop motor torque. The tension servo loop has a major feedback signal component C2 which sums the motor currents as representative of the sum of the torques in the motors and the tension resulting in the tape. Additional tension components representing a steady bias C1, a take-up follower C3 and rapid deceleration signal C4 are also employed.