Multi-frequency Receiver - Features

Features

  • The MFR firmware, written entirely in TMS320 assembly language due to the poor efficiency of DSP C compilers at the time, was capable of decoding multiple channels of PCM digital audio while detecting the following signaling systems:
    • MF, Multi-Frequency Tones
    • DTMF, Dual-Tone Band, Multi-Frequency Tones
    • Call Progress Tones
    • Other system audio frequencies as needed for on-line, and off-line system testing
  • A highly optimized version of the Goertzel algorithm was used as part of the firmware's frequency detection algorithms.
  • Due to the tight timing involved in the designs, controlled impedance printed circuit board design techniques was introduced with the MFR-I layout in 1983.

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