Patent ID: 8374322
Filing Date: 2013-02-12
Classification: H04Q

Abstract:
1. A telephone communications system having a function for receiving a multifrequency signal, comprising: a quantizing device quantizing said multifrequency signal at a sampling frequency which is twice or more as large as a sampling frequency necessary for sampling said multifrequency signal to produce quantized data; a low-pass filter low-pass filtering said quantized data at a cutoff frequency higher than a maximum frequency of said multifrequency signal to produce low-pass filtered data; and a multifrequency signal receiver alternately performing an odd-numbered receiver processing and an even-numbered receiver processing on said low-pass filtered data, wherein said multifrequency signal receiver comprises: a numbering processing unit numbering said low-pass filtered data to produce numbered data with a data number; a least significant bit discriminating unit discriminating a least significant bit of the data number added to said numbered data; an even-numbered receiver processing performing unit performing the even-numbered receiver processing on said numbered data when the least significant bit of the data number is “0”; and an odd-numbered receiver processing performing unit performing the odd-numbered receiver processing on said number data when the least significant bit of the data number is “1”.