H - Electricity – 03 – B
Patent
H - Electricity
03
B
H03B 21/00 (2006.01) H04M 1/50 (2006.01) H04M 19/02 (2006.01) H04Q 1/457 (2006.01)
Patent
CA 2326873
An arithmetic processing section is designed to repeatedly execute product-sum arithmetic processing a number of times equal to the number of samples corresponding to each of the frequencies, in which a value obtained by subtracting a product-sum arithmetic value two sampling periods before from an input signal and a value obtained by multiplying a product-sum arithmetic value one sampling period before by a coefficient corresponding to a reference frequency contained in a DTMF signal are added. A comparator extracts an output value equal to or larger than a predetermined threshold value from the product-sum arithmetic values obtained by the arithmetic processing section. A matrix section determines the type of DTMF signal on the basis of at least two output values extracted by the comparator.
Hase Yoshiko
Otsuka Eiji
Yamashita Takeshi
Gowling Lafleur Henderson Llp
Kabushiki Kaisha Toshiba
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