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OVERVIEW OF APOLLO PCM HARDWARE
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The DSP based ApolloPCM is a multimode PCM Processor board that contains a DSP implemented digital bit synchronizer, IRIG Class II PCM decommutator, PCM simulator, IRIG Time Code Reader and optional Viterbi Decoder designed in various form factors. Using state-of-the-art DSP dedicated Field Programmable Gate Arrays (FPGA), ApolloPCM is the most flexible and technically advanced PCM Processor board available. The functional blocks (i.e. bit synchronizer, decommutator,PCM simulator, etc.) of the ApolloPCM can be used individually or as a seamless combined PCM processing system. All of the circuitry for the PCM Processor Board is located on a single PCB, without the need for any mating daughter or add-on cards. |
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By using DSP based algorithms including Finite Impulse Response (FIR) filters, multistage recursive decimation filters,Modulated Numerically Controlled Oscillators (MNCO) and DSP implemented Phase- Locked Loops (PLL).ApolloPCM bit synchronizer section eliminates the need for calibration and tuning. User-friendly Windows based Graphic User Interface (GUI) software is supplied for easy installation in to a Windows based host computer system. DSP algorithms are implemented in state-of-the-art FPGAs allowing for rapid enhancements or customization.There are two independent input serial bit stream inputs that are user selectable and received in analog form, conditioned with a digital auto gain control circuit, and fed into a sophisticated anti-alias filter prior to a 14-bit digitizer.
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