EXTRACTING SUPPLEMENTAL DATA IN AN INFORMATION SIGNAL

• Main Authors: LINNARTZ, JOHAN, P., M., G, KRAGT, ERWIN, KAMPERMAN, FRANCISCUS, L., A., J
• Format: Patent
• Language: English; French; German
• Published: 01.03.2006
• Subjects: ACOUSTICS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; MUSICAL INSTRUMENTS; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; SPEECH ANALYSIS OR SYNTHESIS; SPEECH OR AUDIO CODING OR DECODING; SPEECH OR VOICE PROCESSING; SPEECH RECOGNITION; TRANSMISSION

A method and an arrangement are disclosed for embedding supplemental data in an information signal such as a sigma-delta modulated audio signal. The encoded signal includes two or more channels, e.g. a left channel bit stream (z1) and a right channel bit stream (z2). The same supplemental data (w) is accommodated at corresponding predetermined bit positions, e.g. every M bit position, of the bit streams. This allows detection and extraction of the supplemental data without the need for accommodating a sync pattern in the signal. At the receiving end, a sequence of M bits from the first channel is compared with a corresponding sequence of M bits from the second channel. If they are identical, the sequence is a candidate supplemental data sequence. This is done for different sequence positions (m) until the supplemental data has been found.