| 摘要 |
TELEPHONE COMMUNICATIONS SYSTEM INCREASING A RECEPTION COUNT TWOFOLD A telephone communications system (10) includes a quantizing device (20) quantizing a multifrequency signal at a sampling frequency which is twice or more as large as a sampling frequency necessary for sampling the multifrequency signal to produce quantized data, a low-pass filter (30) low-pass 1o filtering the quantized data at a cutoff frequency higher than a maximum frequency of the multifrequency signal to produce low-pass filtered data, and a multifrequency signal receiver (40) alternately performing an odd-numbered receiver processing and an even-numbered receiver processing on the low-pass filtered data. TELEPHONE COMMUNICATIONS SYSTEM 50 QUANTIZING 2kHz MULTIFREQUENCY +DEVICE LOW-PASS SIGNAL RECEIVER FILTER (DSP) (DSP) SAMPLING PERIOD (80) ODD-NUMBERED EVEN-NUMBERED ODD-NUMBERED RECEIVER RECEIVER RECEIVER PROCESSING PROCESSING PROCESSING |
