| 摘要 |
PURPOSE:To attain low cost for a modulator by applying the MSK conversion of an NRZ signal by means of software while dividing it into plural samples per 1 bit in a personal radio equipment or the like. CONSTITUTION:The NRZ signal is applied with the MSK conversion at the inside of a microprocessor 13, the converted result is outputted to a D/A converting section 15 as 3-bit data and outputted from the converting station 15 as an analog signal. When 1-bit transmission data is inputted, the processor 13 discriminates whether the data is 1 or 0, and when 0, an output inverting flag is inverted and the address of the MSK conversion data table corresponding to the transmission data is set initially. The conversion data of the address is read, the 2's complement of the data is calculated according to output inverting flag information and the data subjected to the MSK conversion is outputted to the converting section 15. After the address of the MSK conversion data table is incremented by one, whether or not one-bit data transmission is finished is discriminated and this operation is repeated. The machine cycle number in this repetitive interval is brought into a prescribed number. |
