Abstract: Water resistant acoustic ports and electronic hearing protection devices incorporating such ports are described. More specifically, water proof acoustic ports that provide water protection for an internal sealed chamber by providing acoustically transparent inlets that are capable of withstanding external water pressure at given depth due to their volume relation to that of the internal chamber, as well as hearing protection devices incorporating such ports, are described.

Abstract: A passive interface for connecting an electronic memory device to an exterior circuit is provided. The passive interface includes a signal connection point, a power connection point and a ground connection point on an electronic memory device. A first passive component forms an electrical connection between the signal connection point and the power connection point. A second passive component forms an electrical connection between the power connection point and the ground connection point. And the power connection point receives a conditioned voltage signal through the electrical connection between the signal connection point and the power connection point. Such a passive interface can be used in a variety of devices, including headsets for intrinsically save applications.

Abstract: A concha-fit electronic hearing protection device including an eartip and an earpiece body. When the device is fitted in the ear of a user, the eartip externally occludes the ear canal and the earpiece body internally occludes the eartip.

Abstract: Water resistant acoustic ports and electronic hearing protection devices incorporating such ports are described. More specifically, water proof acoustic ports that provide water protection for an internal sealed chamber by providing acoustically transparent inlets that are capable of withstanding external water pressure at given depth due to their volume relation to that of the internal chamber, as well as hearing protection devices incorporating such ports, are described.

Abstract: A concha-fit electronic hearing protection device including an eartip and an earpiece body. When the device is fitted in the ear of a user, the eartip externally occludes the ear canal and the earpiece body internally occludes the eartip.

Abstract: A passive interface for connecting an electronic memory device to an exterior circuit is provided. The passive interface includes a signal connection point, a power connection point and a ground connection point on an electronic memory device. A first passive component forms an electrical connection between the signal connection point and the power connection point. A second passive component forms an electrical connection between the power connection point and the ground connection point. And the power connection point receives a conditioned voltage signal through the electrical connection between the signal connection point and the power connection point. Such a passive interface can be used in a variety of devices, including headsets for intrinsically save applications.

Abstract: A reset signal generator includes circuitry for detecting conditions indicating that a reset signal is necessary and generating a reset signal in response. Such conditions may include low power supply voltage (i.e., "brown out") or the presence of transient signal spikes. Circuitry is provided for extending the duration of the reset signal after power is initially applied, because at this time associated digital circuitry may not be fully powered-up, and may require a longer than normal reset pulse. In contrast, a reset pulse of a normal duration is generated when the digital circuitry is fully powered-up and a transient signal spike is detected. Isolating circuitry is coupled between the detecting circuit and the extending circuit to isolate the detecting circuit from the extending circuit when there is no power-on condition, (i.e. when normal operating voltage is present) in order to prevent the duration of the reset pulse from being extended.

Abstract: In a television system including closed caption circuitry for receiving and decoding closed caption data, a controller continually monitors the closed caption circuitry for an indication of the presence of any of a plurality of predetermined valid closed caption data codes. Every time any of the predetermined valid closed caption data codes is detected, a timer is reset to begin timing a predetermined time interval, and an on-screen display indicating that closed caption data are available is enabled. If a subsequent one of the predetermined valid closed caption data codes is not detected before the expiration of the time interval, then the on-screen display indicating that closed caption data are available is disabled. In another embodiment of the invention, a lamp is illuminated to indicate the availability of useful closed-caption data.