Method for coding and de-coding audio and video information

A method for coding and de-coding information comprised of video and audio information in an information-transmission system, particularly for pay-television, comprising the steps of:

• for coding:
• (a) converting an input analog signal which includes said information into a digital signal,
• (b) treating said digital signal to produce a treated digital signal of a form which makes the information content thereof unintelligible to normal receiving circuits by:
• (1) defining a base time period according to which said audio information in the form of digital data is cut into identical slices, (2) transposing an order of the information in each slice, and (3) compressing the transposed information in each slice together with a fraction from the directly adjacent slices, and
• (c) converting said treated digital signal to a transmit analog signal to transmit same;
• and
• for receiving and de-coding:
• (a) receiving an input analog coded signal and converting the input analog coded signal into a coded digital signal,
• (b) treating said coded digital signal to form a treated digital signal of a form with an information content which is intelligible for normal receiving circuits, and
• (c) finally converting the treated signal back to analog form for the use thereof.