H - Electricity – 04 – B
Patent
H - Electricity
04
B
354/97
H04B 1/06 (2006.01) H03J 3/18 (2006.01) H03J 5/02 (2006.01) H03M 1/00 (2006.01)
Patent
CA 1076261
S0838 METHOD OF AND APPARATUS FOR CONVERTING A PLURAL-BIT DIGITAL SIGNAL TO A PULSE WIDTH MODULATED SIGNAL ABSTRACT OF THE DISCLOSURE A method of and apparatus for converting a plural-bit digital signal to a pulse width modulated signal which, there- after, can be filtered to derive an analog signal level corre- sponding to the value of the digital signal. A periodic timing signal is produced and each period thereof is divided into pre- determined sections. The value of the digital signal is divided by a factor equal to the number of predetermined sections, and the divided digital signal is converted into a corresponding pulse width modulated signal during each of the timing sections. The pulse width of the pulse width modulated signal in selected ones of the timing sections is selectively increased by a pre- determined amount In the event that the divided digital value is not an integral number. In particular, the number of such timing sections wherein the pulse width of the pulse width modulated signal is increased is equal to the remainder obtained after the value of the digital signal is divided. -i-
260033
Mogi Takao
Taki Akira
Yamazaki Hiroshi
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