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
Famous quotes containing the word features:
““It looks as if
Some pallid thing had squashed its features flat
And its eyes shut with overeagerness
To see what people found so interesting
In one another, and had gone to sleep
Of its own stupid lack of understanding,
Or broken its white neck of mushroom stuff
Short off, and died against the windowpane.””
—Robert Frost (1874–1963)
“These, then, will be some of the features of democracy ... it will be, in all likelihood, an agreeable, lawless, particolored commonwealth, dealing with all alike on a footing of equality, whether they be really equal or not.”
—Plato (c. 427–347 B.C.)
“It is a tribute to the peculiar horror of contemporary life that it makes the worst features of earlier times—the stupefaction of the masses, the obsessed and driven lives of the bourgeoisie—seem attractive by comparison.”
—Christopher Lasch (b. 1932)