Copyright © Philip M. Parker, INSEAD. Terms of Use.
| Year | Description |
| 1998 | Invention patented by Kazuo Kawai on March 16th, 1998. Abstract: An AFC circuit for a frequency scanning FSK receiver is so constructed that through put of data which can be transmitted is improved by shortening a header of a packet signal owing to the fact that frequency errors remaining when an object signal is caught by the frequency scanning and the frequency scanning is stopped are eliminated in a short period of time. In the frequency scanning FSK receiver having an AFC function, the scanning is stopped, when either one of upper and lower side band waves of a bit synchronizing signal of a desired signal is caught by the frequency scanning by means of a VCO, to which a scanning voltage from a scanning signal generator is applied. An operating circuit calculates a set voltage applied to the VCO at the AFC convergence to form it on the basis of a control voltage (scanning voltage) applied to the VCO at that time and a control sensitivity thereof as well as a detection voltage and a detection sensitivity of a frequency error detector at that time. The AFC circuit is made active after having applied this set voltage to the VCO. |
| Source: selected by the editor from original sources. | |
Copyright © Philip M. Parker, INSEAD. Terms of Use.
