Abstract: An apparatus and method for transmitting data over a wireless connection uses a transmitter and receiver. The receiver assembles received data packets according to an identified predefined template and sequence numbers assigned at the transmitter. The transmitter also maintains an optimum packet load of the wireless connection at a selected level responsive to a packet count maintained at the transmitter.

Abstract: A cover for a LED sign is manufactured from a stainless steel sheet that is dimensionally larger than the array of light emitting diodes comprising the LED sign. The stainless steel sheet is laser cut and then bent to simultaneously form a plurality of apertures and a corresponding plurality of louvers each extending adjacent one of the apertures. The apertures facilitate viewing of the LED sign and the louvers shield the light emitting diodes comprising the LED sign from excessive light.

Abstract: An apparatus and method for transmitting data over a wireless connection uses a transmitter and receiver. The receiver assembles received data packets according to an identified predefined template and sequence numbers assigned at the transmitter. The transmitter also maintains an optimum packet load of the wireless connection at a selected level responsive to a packet count maintained at the transmitter.

Abstract: A system and method for providing security to at least one mass transit vehicle is disclosed wherein a memory at the at least one mass transit vehicle is used for storing a plurality of digital images that are provided from at least one camera. Upon detection of an alarm signal at the at least one mass transit vehicle at least a portion of the plurality of digital images are transmitted from the mass transit vehicle to a remote monitoring site responsive to the alarm signal.

Abstract: Apparatus and method for allowing an operator of a transit vehicle to make public address announcements to passengers internal and external to the vehicle. The safety of the vehicle and passengers is maintained through providing a hands-free directional microphone having noise canceling characteristics. The microphone is used as an input device for receiving an audio signal and provides the signal to a processing module that converts the signal into a digital signal. The digital signal is then processed by a digital signal processor to cancel undesirable noise common to a transit vehicle. The noiseless signal can then be converted into an analog signal and recorded within the memory of the public address system where, upon needed, the signal can be transferred to an output device such as a speaker system internal or external to the vehicle. After playback, the recorded message can also be easily repeated by means of a repeat switch.

Abstract: A retainer clip for ribbon cable connectors comprises spaced, parallel feet which are received in transversely extending apertures extending through the female component of a ribbon cable connector. Legs extend upwardly and inwardly from the feet, and male component engaging arms extend from the upper ends of the legs for resiliently securing the male component in engagement with the female component of the connector. Camming members extend from the ends of the male component engaging arms and a handle extends from the ends of the cramming members for connecting the two sides of the retainer clip.

Abstract: Apparatus and method for allowing an operator of a transit vehicle to make public address announcements to passengers internal and external to the vehicle. The safety of the vehicle and passengers is maintained through providing a hands-free directional microphone having noise canceling characteristics. The microphone is used as an input device for receiving an audio signal and provides the signal to a processing module that converts the signal into a digital signal. The digital signal is than processed by a digital signal processor to cancel undesirable noise common to a transit vehicle. The noiseless signal can then be converted into an analog signal and recorded within the memory of the public address system where, upon needed, the signal can be transferred to an output device such as a speaker system internal or external to the vehicle. After playback, the recorded message can also be easily repeated by means of a.repeat-switch.

Abstract: A multi-channel digital random access recorder-player receives an analog audio signal, converts the audio signal into a digital signal, and stores the digital signal in a memory for random access. The memory includes sixteen channels, each channel having sixteen memory boards, each channel and each memory board being assigned a unique four bit binary address by an address counter. An external control is provided by which the user selects an address for recording or playback and a comparator compares the selected address with the addresses of the memory. When the memory address corresponding to the selected address is detected, that memory board is enabled so that data can be recorded on the memory board or retrieved from the memory board for playback through an audio output device such as a loudspeaker. The recorder-player thereby provides random access to a memory. Also provided is a system in which several modules, each with a logic board and a memory, are combined into a single system.

Abstract: The invention is a digital record/playback apparatus including an input digital filter, and A/D converter, a solid state memory, a D/A converter and an output digital filter. The entire system is driven off a single clock source which allows the frequent response of the filters to be modified simultaneous with the sampling frequency of the A/D and D/A converter. This allows the record/playback apparatus to record low frequency signals, such as medical data, as well as relatively high frequency signals such as voice, by simply changing the frequency of the clock source. In addition, the apparatus includes an expandable memory which allows recording of up to one hour or more of program material.