Polygram Gmbh

Bjoern Bluethgen

A method for encoding analog signals for storage or transmission includes the steps of sampling momentary values of the analog signals and converting the sampled values into PCM code words and forming PCM differential code words from two successive PCM words, each of the differential PCM words being of a prescribed length. The length of the generated differential PCM words are continuously compared to a reference code word and upon the length of a differential code word exceeding a specified length the word is either abbreviated by a companded differential PCM word by eliminating some of the least significant code elements, or by division of the excess-length word into two successive code words respectively comprising the least significant and most significant bits of the excess-length word, the differential PCM words additionally being replaced by PCM words when the associated signal content does not exceed the length prescribed by the reference code word.

Method for encoding analog signals

A method is disclosed for the joining or mixing-in or fading of two program segments which appear in the form of digital pulse sequences, free of interfering signals, particularly audio signals digitally stored on magnetic tape, whereby code word sequences which are present in both signal segments in the region of an editing location or fading location are scanned, together with their associated time codes, and are fed to respective intermediate memories. Then, by an acoustically-monitored cyclical circulation of the contents of the intermediate memories, controlled in frequency and direction, an editing location of comparable information for each program segment is determined which is free of interfering signals. A transition, controlled by the time codes is then occasioned from the first signal segment to the second signal segment or a fading of the second signal segment is occasioned relative to the first signal segment. The two time codes which are associated with the editing locations are read for carrying out a mechanical and/or electrical connection of two signal program segments which are acoustically free of interfering signals at the proper time corresponding to a common edit point identified by the two time codes.

Method for the joining, or mixing-in or fade-in of two audio digital

A method for encoding analog signals for storage or transmission purposes, particularly for the digital recording of audio signals in studio devices, samples periodic values of the analog signals and converts the sampled values into pulse-code modulation code words. Successive pulse-code modulation code words are transformed by means of subtraction into pulse-code modulation difference code words and, together with additional auxiliary code elements, form a reference code word having a selected constant length. A reduction of the digital signal flow is achieved as a result of the reference code word, including the auxiliary code elements, being selected shorter than the maximum possible length of a pulse-code modulation difference code word. The generated pulse-code modulation difference code words are continuously monitored as to length, and upon the identification of a difference code word having an excess length, that is, greater than the reference code word, either the excess-length difference code word is abbreviated or is replaced by a pulse-code modulation code word of suitable length.

Growing community of inventors

Celle, Germany

Bjoern Bluethgen