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Alban Graf

Gustav Guanella

Method and apparatus for encoding transmitted data and decoding the data at a receiving facility. The data is divided into elements of equal length. Each element is assigned an age number having a value within a prescribed range. The age value determines the number of delay intervals experienced by each element before being transmitted. Delays of the proper length are obtained by the use of storage elements. Age numbers are assigned arbitrarily. The age numbers are incremented upon the passage of each delay interval. Values within the aforementioned range are randomly generated. A data element is removed from storage and transmitted when: (1) its age number compares with the randomly generated value; or (2) when its age number reaches the extreme value; or (3) when its age number is zero. A new element is placed in storage simultaneously with the removal of an element therefrom. At the receiver end elements are stored and their age numbers are incremented upon the occurrence of each delay interval. Elements are removed from storage (and replaced by a newly received element) when they reach the extreme value. Elements having age numbers of zero (i.e. 'no delay') are transferred to the receiver output line without delay. The re-transposed elements at the receiver output line reconstruct the message elements into the arrangement of the original data as it was before its encoding (i.e. transposition) at the transmitting end. Various modifications of the basic technique are provided to encode various types of data and to solve other technical problems.

Methods of and apparatus for the encoded transmission of information

The known process for transmitting two or more audio signals over a single transmission channel by eliminating alternate small segments from a first signal and filling the gaps with alternate small segments of a second signal and then filling in the gaps in the received signals with repeated segments, is found to be significantly improved with respect to comprehension or understandability, etc., if the audio signals are divided into a low frequency subband and one or more high frequency subbands and if the lowest frequency subband is transmitted substantially continuously while the higher frequency subbands are segmented and transmitted as before. Processes and apparatuses for splitting the audible signals into high and low frequency subbands and for treating the signals both on the sending and receiving sides to take advantage of the above discovery are disclosed.

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Gebenstorf, Switzerland

Alban Graf