Communication device and data transmitting method
AssigneeMegasoft, Inc.
InventorsMamoru Takai, Akira Hasebe
Life of this patent
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Abstract
On receiving a digital signal from a computer (2), a frequency detector (28) determines a transmitting speed for computer (2). When the computer (2) has an operating frequency of 7.9872 of MHz, a speed other than one of the standardized speeds is selected to implement communication between the computer (2) and the frequency detector (28) at a speed of more than 9600 bps. To do this communication, the frequency detector (28) has a table for obtaining the speed other than one of the standardized speeds.
Claims12
A communication device having a first reference clock which connects via a first communication line with a digital data processing device having a second reference clock and which connects with an opposite device via a second communication line, comprising:
- a) a first dividing means for dividing the first reference clock having first reference frequency according to a first division number to create a first transmitting speed clock having first transmitting frequency,
- b) a second dividing means for dividing the first reference clock having first reference frequency according to a second division number to create a second transmitting speed clock having second transmitting frequency,
- c) first line side communication means which is able to communicate digital signals with the digital data processing device at a speed determined by the first transmitting speed clock,
- d) second line side communication means which is able to modulate digital signals and demodulate modulated signals and which is able to communicate with the opposite device through the second communication line, at a speed determined by the second transmitting speed clock,
- e) the first dividing means determining the first division number with condition that the first transmitting frequency of the first transmitting speed clock is a divisor of the second reference frequency of the second reference clock and is not less than the second transmitting frequency of the second transmitting speed clock, and
- f) the second dividing means determining the second division number with condition that the second transmitting frequency of the second transmitting speed clock is equal to a frequency corresponding to one of standardized data signal communication speeds through the second communication line.
A communication method using a communication device having a first reference clock which connects via a first communication line with a digital data processing device having a second reference clock and which connects with an opposite device via a second communication line, comprising the steps of:
- a) creating and outputting a first transmitting speed clock having a first transmitting frequency by dividing the first reference clock having first reference frequency by a first division number,
- b) creating and outputting a second transmitting speed clock having a second transmitting frequency by dividing the first reference clock having first reference frequency by a second division number,
- c) communicating with the digital data processing device at a speed according to the first transmitting speed clock by using first line side communication means, said first line side communication means communicating digital signals with the digital data processing device at a speed determined by the first transmitting speed clock,
- d) communicating with the opposite device via the second communication line at a speed according to the second transmitting speed clock by using second line side communication means, said second line side communication means being able to modulate digital signals and demodulate modulated signals and to communicate with the opposite device through the second communication line at a speed determined by the second transmitting speed clock,
- e) the first division number being determined with condition that the first transmitting frequency of the first transmitting speed clock is a divisor of the second reference frequency of the second reference clock and is not less than the second transmitting frequency of the second transmitting speed clock, and
- f) the second division number being determined with condition that the second transmitting frequency of the second transmitting speed clock is equal to a frequency corresponding to one of the standardized data signal communication speed through the second communication line.
Dependencies are inferred from the claim text.