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Facsimile apparatus, facsimile method, and facsimile system including a modem for determining a data rate
| Details |
Inventors: Kagawa, Tetsuya; Kawaguchi, Tetsuya;
Assignee: Ricoh Company, Ltd. (Tokyo, JP)
Primary Examiner: Johns; Andrew W.
Assistant Examiner:
Attorney, Agent or Firm: Cooper & Dunham LLP
A facsimile apparatus capable of sending and receiving image data by use of a transmission control procedure based on the G3 (Group III) standard of ITU-T (International Telecommunication Union--Telecommunication Standardization Sector) Recommendations, and a transmission control procedure based on ITU-T Recommendation V.34. Whether or not to continue resending image data is determined on the basis of a resending condition or conditions known by a transmitting station or a receiving station. The apparatus enhances efficient communication and reliability. |
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DETAILED DESCRIPTION It is therefore an object of the present invention to provide a facsimile apparatus capable of increasing the communication efficiency and reliability by determining, based on a resending condition or conditions known by a transmitting station or a receiving station, whether or not to shift down the transmission rate and continue resending.
It is another object of the present invention to provide a facsimile apparatus capable of shifting down the transmission rate adequately so as to reduce errors, and thereby enhancing efficient and reliable communication.
In accordance with the present invention, in a facsimile apparatus of the type including a modem capable of determining a data rate for image data communication in accordance with transmission quality of a communication circuit, and using a protocol allowing, at the beginning of a control channel for allowing a transmitting side and a receiving side to interchange control signals including an error frame resending function and following a primary channel assigned to image data communication, either one of the transmitting side and the receiving side to execute a shift-down procedure for shifting down the data rate, a data rate detecting section detects a data rate at the time of error frame resending.
A counting section counts the number of times of resending effected at the same data rate.
A determining section determines whether or not the resending effected at the same data rate has been repeated a preselected number of times.
A controller executes the shift-down procedure when the resending at the same data rate has been repeated the preselected number of times.
Also, in accordance with the present invention, in a facsimile apparatus of the type described, a reading section reads information stored in the modem and relating to the circuit quality of the communication circuit occupied.
A determining section determines the quality of the communication circuit on the basis of the information.
A controller executes the shift-down procedure when the quality is lower than a preselected value
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Cell Phones 
