초록 ▼

The present invention relates to process for encoding and transmitting information wherein data, digitalized speech, image, or documents, optionally in colour, are encoded by multilevel combination code with multilevel code elements into a signal, in particular represented by period duration of said

The present invention relates to process for encoding and transmitting information wherein data, digitalized speech, image, or documents, optionally in colour, are encoded by multilevel combination code with multilevel code elements into a signal, in particular represented by period duration of said signal and/or by a different number of periods in connection with amplitude levels of said signal whereby an amplitude level is used as redundance or quasi level for an identification of code combinations. In the case of digital encoding of the information of a sequence of similar code elements, similar code words, similar lines with associated code words in the sequence are combined in such a way that the number of the sequences are provided in code. The processes may be adapted in such way that the half tones of telefax on the transmitting side are either directly provided with a quantification value of the half tones, preferably according to the run length principle, and thereafter transmitted in a multilevel code, and that, at the receiving end, means are foreseen that after decoding convert the signal into pixels according to a dither process. By using these kinds of processes, transmission times are shortened and bandwidths are reduced.

대표청구항 ▼

Method for coding and transmitting information comprising: generating a multilevel phase coding by providing an alternating current of constant frequency and constant phase and providing pulses of predetermined length as code elements, represented by half-periods or periods of said alternating curre

Method for coding and transmitting information comprising: generating a multilevel phase coding by providing an alternating current of constant frequency and constant phase and providing pulses of predetermined length as code elements, represented by half-periods or periods of said alternating current of said frequency, which pulses are transmitted in an uninterrupted series, a change of phase of said pulses being obtained by increasing or decreasing the numbers of half-periods or periods in relation to the number of half-periods or periods of the preceding pulse, or providing the difference phase as code element, for which the preceding code element is used as a reference, wherein also a leading or lagging phase in relation to the reference phase or in relation to the preceding impulse phase is used as level criterion and a change of phase level which cannot be distinguished is marked by a change of the amplitude of said alternating current.