Synchronizing devices

Claim 1

In a teleprinter communication link, comprising a single transmitting teleprinter apparatus for producing coded signals in a code including a start and a stop bit and a plurality of data bits, a single receiving teleprinter apparatus for receiving said coded signals and a single transmission channel connecting said single transmitting teleprinter to said single receiving teleprinter which operates substantially in synchronism with the information introduced into the transmission channel by means of a flywheel synchronizer associated therewith, the improvement comprising a single converting circuit connected between said transmitting teleprinter and the input of said transmission channel, said converting circuit comprising first serial to parallel conversion means; first storage means for storing a number of information bits derived from said serial to parallel conversion means, said number corresponding at least to the number of bits in said code; and a second parallel to series conversion means for reducing the duration of said stop bit and for feeding arbitrary filler signals, which are insignificant as regards information, to said transmission channel in the time gaps caused by the difference between the signal frequency at said transmitting teleprinter apparatus and the signal frequency supplied to said transmission channel, thereby permitting said receiving teleprinter apparatus to normally operate at maximum rate in the start-stop mode substantially independently of said synchronizing means; said serial to parallel conversion means comprising second temporary storage means for a group of said information bits and read-in means coupled to the transmitting teleprinter for serially inserting the information bits of a group into said first temporary storage means at a first substantially constant rate; said parallel to serial conversion means comprising third temporary storage means for a group of said information bits and readout means for serially transferring the information bit contents of said second temporary storage means into the input of said transmission channel at a second substantially constant rate; first mechanical means for simultaneously transferring the contents of said serial to parallel conversion means to said first storage means when said transmitting teleprinter generates the stop and start codes between adjacent information groups; second mechanical means for simultaneously transferring the contents of said first storage means to said third storage means a predetermined time after operation of said first transferring means; said second constant rate being faster than said first constant rate.