Hearthero, Inc.

U.S. Robotics Corporation

Other

Clifford H Wallach

Michael C Garrett

Robert C Suffern

Dale M Walsh

The disclosure describes various aspects of an automated external defibrillator (AED) system, including shock generating electronics, a battery configured for providing power to the shock generating electronics, power management circuitry configured for managing the shock generating electronics and the battery, at least one environmental sensor configured for monitoring environmental conditions in which the AED system is placed, and a controller configured for controlling the power management circuitry and the at least one environmental sensor. The at least one environmental sensor includes a temperature sensor configured for providing a temperature measurement, and the controller is further configured for adjusting operations of the power management circuitry in accordance with the temperature measurement provided by the temperature sensor. The disclosure further describes associated methods of using the AED system.

Automated external defibrillator systems with operation adjustment features according to temperature and methods of use

An improved data compression system and method is disclosed. The data compression method uses smaller fixed bit words to represent streams of digital data. The fixed bit words are sent instead of the streams of digital data. A table relating the fixed bit words and streams of digital data is provided as a dictionary. Each entry has a node which is indexed in a stored index. As additional fixed bit words are established for new streams of digital data, older fixed bit words are deleted from the dictionary. The older fixed bit words are prevented from being deleted if they are used for subsequent streams of data. There are a number of methods to determine how the older fixed bit words are retained which are disclosed.

System and methods for improving data compression

A modem for connecting data terminal equipment (DTE) to a remote DTE via a general switched telephone network or leased lines at data rates of 300, 1200 and 2400 bps using standard modulation techniques, and additonally providing virtual full duplex transmission capability at 9600 bps using trellis code modulation (TCM). The high-speed 9600 bps path is implemented by asymmetrical frequency division of the available bandwidth into a high speed, wideband forward channel (9600 bps) and a low speed, narrowband backchannel (300 bps). The high speed transmitting channel is assigned to that modem having the greatest data demand and the direction is dynamically reversed whenever the amount of data awaiting transmission over the low speed channel exceeds a predetermined maximum backlog, provided that a direction reversal has not taken place for at least a specified minimum interval during which use of the forward channel is guaranteed. To improve the efficiency of the backchannel, extended data formats are added to the MNP link protocol for use in backchannel transmission and to control direction reversals on the line. The modem is implemented with three available general purpose microprocessors with interprocessor communications being synchronized by a timer driven interrupt mechanism. A hardware timer/counter built into one of these processors is used to monitor the signals on the telephone line to detect and distinguish answer tones, voice signals, busy signals, ringback signals and dial tones. A hardware counter/timer is also used to measure the width of the start bit from the serial port to form the basis for a calculation of the baud rate being used by the DTE.

Asymmetrical duplex error-controlled modem

A modem for connecting data terminal equipment (DTE) to a remote DTE via a the general switched telephone network or leased lines at data rates of 300, 1200 and 2400 bps using standard modulation techniques, and additionally providing virtual full duplex transmission capability at 9600 bps using trellis code modulation (TCM). The high-speed 9600 bps path is implemented by asymmetrical frequency division of the available bandwidth into a high speed, wideband forward channel (9600 bps) and a low speed, narrowband backchannel (300 bps). The high speed transmitting channel is assigned to that modem having the greatest data demand and the direction is dynamically reversed whenever the amount of data awaiting transmission over the low speed channel exceeds a predetermined maximum backlog, provided that a direction reversal has not taken place for at least a specified minimum interval during which use of the forward channel is guaranteed. The transmission speed of the high speed channel is adaptively adjusted in response to changes in the quality of the data link provided by the dial up telephone facility. Cyclic redundancy checking is used to monitor error rates and failed retraining attempts are also used to indicate the need for lower transmission speeds. The trellis decoding algorithm generates a metric value which is used during high speed transmission to indicate when a speed up should be attempted, and the equalization eyescatter signal is used for the same purpose when transmission is taking place at 4800 baud when trellis coding is not used. Rate change requests are sent over the low speed backchannel to the high speed channel which then executes a mandatory speed switch.

Growing community of inventors

Buffalo Grove, IL, United States of America

Clifford H Wallach