Abstract:
A method for storing a crypto key and an associated checkword of the crypto key stored in a non-volatile memory within a micrcontroller and then providing the crypto key and associated checkword to an encryption device. The method next loads the crypto key and associated checkword into the encryption device.
Abstract:
A digital audio signal processing circuit for eliminating the amplitude and phase components of logic induced modulation from a left right clock signal, a bit clock signal and digital data bits generated by a digital signal processor within a compact disk player. The digital audio signal processing circuit includes a trio of optical couplers for removing the amplitude component of logic induced modulation from the left right clock signal, the bit clock signal and the digital data bits; a clock circuit for generating a system clock signal and a trio of D Flip-Flops for removing the phase component of logic induced modulation from the left right clock signal, the bit clock signal and the digital data bits and a digital to analog converter for separating the data bits into left channel data bits and right channel data bits and for converting the left channel data bits into a first analog signal and the right channel data bits into a second analog signal for use by speakers or the like to provide stereo sound. An isolated power supply provides both analog and digital voltages to the electronic elements of digital audio signal processing circuit.
Abstract:
A PCM encoder which receives asynchronous serial data and incorporating the serial data and eight channels of analog data into a PCM data stream. The encoder includes a microprocessor which processes the serial data provided in eight bit digital words and the analog data which the microprocessor converts to twelve bit digital words. The encoder also has a programmable gate array which receives six bits of data during each transfer of data from the microprocessor to the gate array. The gate array for the PCM encoder also receives a Frame Sync, and then processes the data to provide a data stream containing NRZL data and Bi Phase data.
Abstract:
A system which is packaged within a projectile fuze body and obtains data relative to the projectile during a launch. Sensors are provided which obtain in-bore data as well as in-flight data. The in-bore data is recorded at a fast rate during in-bore travel of the projectile and is read out, continuously, at a slower rate during in-flight travel. Both in-bore data and in-flight data are encoded and transmitted to a ground station for analysis.