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Multiplexer-related

Data-communication-apparatus

Adaptive jitter canceller having sinusoidal accentuator and jitter prediction filter

It is therefore an object of the invention to provide an adaptive jitter canceller in which the ...

Method and apparatus for reducing power dissipation in multi-carrier amplifiers

OF THE DRAWINGS The features and advantages of the present invention outlined above are described ...

High density FM subcarrier modulation with standardized network layer

As illustrated in FIG. 1a, in an FM subcarrier system, a modulated subcarrier is linearly combined ...

Training of level learning modems

FIG. 1 shows, at the left, an analog modem 101 connected to the public switched digital network (PS...

Method and apparatus for a low voltage high current bi-directional termination voltage regulator

Accordingly, the present invention provides a low voltage high current bi-directional termination ...

Time domain equalizer for ADSL

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Automatic gain control circuit for a modem receiver

An object of the present invention is to provide an automatic gain control circuit for a modem ...

All-digital method and apparatus for demodulating an analog signal

It is an object of the invention to provide a demodulator that is totally digital in structure, and ...

Test circuit of multiplex equipment

An object of the present invention is to provide a test circuit for multiplex equipment to be used ...

Echo canceller

OF THE EMBODIMENTS FIG. 1 is a block diagram illustrating an embodiment of an echo canceller of ...

Data communication apparatus

Details

Inventors: Yoshida, Takehiro; Matsuzaki, Susumu;
Assignee: Canon Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Atkinson; Charles E.
Assistant Examiner:
Attorney, Agent or Firm: Fitzpatrick, Cella, Harper & Scinto

A data communication apparatus having an error retransmission mode allows the operator to ascertain an amount of error data when an error is contained in data and when the error is not corrected despite retransmission of the error a predetermined number of times, or makes it possible to reproduce data with respect to correctly received data by discriminating correct data contained in error data, thereby preventing error data from becoming wasted as practically as possible. In addition, at the time of error retransmission, a transmission mode for retransmitting the error data is changed so as to minimize the number of incidents of error retransmission, thereby to enable efficient data transmission.

DETAILED DESCRIPTION Accordingly, a primary object of the present invention is to provide an improved data communication apparatus having an error retransmission function, thereby overcoming the above-described drawbacks of the conventional art.
Another object of the present invention is to provide a data communication apparatus which allows the operator to properly judge the correct or incorrect reception of the communication data in a case where there is an error in communication data although communication is effected in the error retransmission mode.
Still another object of the present invention is to provide a data communication apparatus which is capable of discerning an amount of error occurring in communication data.
A further object of the present invention is to provide a data communication apparatus which is capable of displaying an amount of error occurring in communication data.
A still further object of the present invention is to provide a data communication apparatus which is capable of displaying an amount of error occurring in communication data although communication is carried out in the error retransmission mode.
A further object of the present invention is to provide a data communication apparatus which makes effective use of error data occurring in communication data although communication is carried out in the error retransmission mode.
A further object of the present invention is to provide a data communication apparatus which reproduces normal data contained in error data that occurs in communication data although communication is carried out in the error retransmission mode.
A further object of the present invention is to provide a data communication apparatus which is capable of minimizing an amount of error data occurring in data communication based on the error retransmission mode.
A further object of the present invention is to provide a data communication apparatus which, at the time of occurrence of a frame error in the error retransmission mode, is capable of reducing an amount of error data and enables efficient data transmission by extending the time duration of sending a specific pattern which is sent immediately before transmission of data

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