Facsimile communication system专利检索-压缩失真图形技术专利检索查询-专利查询网

Facsimile communication system

阅读：412发布：2022-04-07

专利汇可以提供Facsimile communication system专利检索，专利查询，专利分析的服务。并且A facsimile communication system is described wherein the transmission of data between a transmitting and receiving apparatus over a voice quality transmission medium is accomplished by providing spectrum compressing encoding of a video signal and by frequency modulation and vestigial sideband transmission of the frequency modulated video signal. In a principal mode of operation, the transmission of video data is preceded by receiver alerting, equalizing, synchronizing and scan pitch signals for respectively shifting the receiver from a standby to an operating status, for correcting distortions in the transmission medium, for causing line by line synchronization between sending and receiving units and for establishing the scanning pitch at the printing unit. A transceiving unit of the system when operating as a receiver in the principal mode generates reverse signalling information for acknowledging a ready to receive status at the initiation of communication and a printer ready status for enabling the transmission of video information. A high degree of reliability in interaction between the sending and receiving units is thereby imparted to the system and facilitates scanning and electrostatographic printing techniques. The transceiving system of the invention is further adapted for operating in optional modes including an automatic document feeding mode, an unattended sending mode and a printer polling mode. The communication system is further adapted to operate with existing facsimile systems which transmit at relatively lower document transmission rates, exhibit different signal formats and have different internal controlling.，下面是Facsimile communication system专利的具体信息内容。

权利要求

1. A facsimile transmission system having a transmitting station and a receiving station, said transmission station adapted for line scanning graphic information which is to be transmitted to said receiving station and for forming a video signal therefrom for transmission, said receiving station adapted for receiving and detecting the video components of said signal and for line scanning a record medium to form a graphic image in accordance with information contained in the video signal and conforming to the image at said transmitting station, the improvement comprising: said transmitting station including means for generating a sequence of control signals preceding the transmission of said video signals, said receiving station including means for responding to said sequence of control signals, and transmitting a response signal to said transmitting station indicative thereof, said transmitting station further including timing means for terminating operation thereof within a predetermined interval of time after said control signals in the absence of the occurrence of said response signal.

2. A facsimile transceiver selectively operable in a transmitting mode or a receiving mode, said transceiver comprising: means for generating a sequence of control signals preceding the transmission of facsimile data; timer means responsive to said control signals for initiating a predetermined period in the absence of a subsequent input signal within said period, means responsive to a predetermined sequence of events for generating said input signal upon the occurrence of each of said events, and means responsive to said timer means timing said predetermined period for terminating operation of said transceiver.

3. In a facsimile transmission system having a transmitting station and a receiving station, said transmitting station adapted to establish a connection to said receiving station and said receiving station adapted to provide a ready signal to said transmitting station, the improvement comprising: means for generating a sequence of control signals preceding the transmission of facsimile data; timer means responsive to said control signals for timing a predetermined period in the absence of a subsequent receipt of said ready signal within said period, means included in said receiving station for generating said ready signal in response to said control signals, and means responsive to said timer means timing said predetermined period for terminating operation of said transmitting station.

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