Method for transmitting information, in which the signals are coded as amplitudes of the half-waves or periods of a sinusoidal alternating current

A method for pulse amplitude modulation as a means for transmitting information, comprising the steps of:

• generating unipolar analog values from a signal to be transmitted and sampling the unipolar analog values at a preset sampling frequency;
• generating at least two code alternating currents in synchronism with subsets of said sampled unipolar analog values, and with a frequency equal to or half of said frequencies of said subsets;
• phase shifting said code alternating currents such that pairs of code alternating currents have a mutual phase difference of 90.degree.;
• modulating the amplitudes of said code alternating currents and of the phase shifted alternating currents in time multiplex mode with the sampled unipolar analog values of the respective subset, and generating an uninterrupted sequence of positive and negative half waves in the form of a continuous sinusoidal signal;
• superposing said pairs of said modulated code alternating currents;
• and
• transmitting each said superposed code alternating current over one transmission channel in the form of a continuous sinusoidal signal as a means for transmitting information based on said generated unipolar analog values.