Method and apparatus for performing high-density DTMF, MF-R1, MF-R2 detection
a detection method and high-density technology, applied in electrical apparatus, automatic exchanges, substation equipment, etc., can solve the problems of still inefficient dtmf context and achieve significant computational overhead for filtering, reduce computational complexity, and accelerate data acquisition
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[0075] Case 1 corresponds to the upper and lower subband energies being within + / −8.5 dB of each other. In this case, there is a high likelihood that tones are present in both the upper and lower subbands. The MF detector 850b then proceeds exactly as in the case of DTMF, picking one tone from each subband. The bandwidth test is then performed using the lowest output energies from the upper and lower subband notches, as determined in steps 925c, 925b, respectively. If E0>E0,1α1 (step 945a) and E1>E1,uαu (step 930a), where E0,1 and E1,u are the minimum output energies for the lower and upper subbands respectively, then, in step 950a, the MF detector 850b picks the digit referenced by the two tones. Case 2: E0E1>7.08
[0076]FIG. 11B is a flow diagram of an embodiment of a process of Case 2 of the MF detector. In Case 2, it may be that either (i) there is a twist larger then +8.5 dB in the MF signal (with tones present in both subbands) or (ii) all the energy is present in the upper...
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