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This article describes the application of the digital signal processor as a voiceband signal processing element. The application chosen is one of the most stringent voice-frequency signal processing applications in the telephone network — providing transmission treatment (eg., gain, equalization, and echo control) for special service circuits. A detailed description of a prototype transmission treatment unit, which uses the DSP, is provided along with descriptions of the digital filter structures and filter synthesis techniques. Measured results for representative extreme cable facility cases are presented, showing that digital signal processing utilizing the DSP meets the telephone network transmission requirements for special service circuits. |
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