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.
Read more about this topic: Multi-frequency Receiver
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