Patent EP0205200B1 successfully refreshed from Google Patents.
EP0205200B1
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EP
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Method for transmitting audio and additional information in digital form
Assignee: Polygram GmbH
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Filing: 1986-05-21
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Granted: 1990-08-01
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Expires: 2006-05-21
Abstract
Abstract The invention relates to a method of transmitting audio information in digital form, in which for the transmission of additional information in digital form data bits of said additional information replace one or a plurality of least significant bits in every nth code word of the audio information. For this purpose one or a plurality of least significant bits of the audio information in every nth code word is/are replaced in predetermined manner by additional information bits, the number of bits being replaced depending on the value of the instantaneous code word of the audio information. This dependence is such that for larger values of the audio information more bits are replaced than for smaller values.
Inventors
- 👤 Björn Blüthgen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 07:49
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/00007; H; H04; H04J; H04J3/00; H04J3/02; H04J3/12; H04J3/125
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
122 words
A method of transmitting audio information in digital form, in which each of a predetermined number of code words represents a sample of an analog audio signal and in which, for the additional transmission of additional information in digital form, one or more least significant bits in every n th code word of the digital audio information is/are replaced by bits of the additional information, n being a natural whole number larger than zero, characterized in that the number of bits being replaced depends on the encoded amplitude value of the relevant code word of the audio information in such a way that when larger predetermined reference values are exceeded more bits are replaced than when smaller predetermined reference values are exceeded.
Claim 2
Independent Claim
122 words
A method of transmitting audio information in digital form, in which each of a predetermined number of code words represents a sample of an analog audio signal and in which, for the additional transmission of additional information in digital form, one or more least significant bits in every n th code word of the digital audio information is/are replaced by bits of the additional information, n being a natural whole number larger than zero, characterized in that the number of bits being replaced depends on the encoded amplitude value of the relevant code word of the audio information in such a way that when larger predetermined reference values are exceeded more bits are replaced than when smaller predetermined reference values are exceeded.
Claim 3
Dependent Claim
18 words
A method as claimed in Claim 1, characterized in that the number n is preferably two or larger.
Claim 4
Dependent Claim
123 words
A method as claimed in Claim 1 or 2, characterized in that when predetermined values of the code words are exceeded one or more least significant bits of the digital audio information are replaced by bits of the additional information not only in each n'" code word but also in the other code words, depending on the magnitude of the encoded amplitude value which is exceeded in such a way that in a predetermined manner more bits are replaced when larger predetermined reference values are exceeded than when smaller predetermined reference values are exceeded, which smaller predetermined reference values are at least for the majority, larger than the reference values for the replacement of the least significant bits in each nt" code word.
Claim 5
Independent Claim
67 words
A method as claimed in any one of the Claims 1 to 3, characterized in that the clock-pulse counting operation for the number n is restarted each time that fixed predetermined values of the code words or sequences of a code word appear and proceeds cyclically until the next appearance of the predetermined code words or sequences of code words which again restart the clock-pulse counting operation.
Claim 6
Independent Claim
51 words
A method as claimed in any one of the Claims 1 to 4, characterized in that after the transmission the additional information bits are separated from the data bits of the audio information and the vacated bit positions in the code words are filled with bits from a digital noise oscillator.
Claim 7
Dependent Claim
269 words
A method as claimed in Claim 1, characterized in that the code words together with synchronising information, sub-code information and, if applicable, error-code information are combined to form blocks of fixed predetermined length, the method comprising the following steps: A. at the system input side (SE), a. dividing the successive code words (1, 2, ... 24) in the block (B) of the main information (H-SIG/C) into a plurality of identical code-word groups (CW1, CW2) comprising code words, which succeed each other directly, b. dividing each code group (CW1, CW2) into reference data words whose information content is invariable and into variable mixed code words, the reference code words preferably constituting the beginning of a code-word group, c. replacing a number of least significant bits of the mixed code words by bits of suitably encoded additional information (Z-SIG), which number of bits to be replaced may be a predetermined number or a number which depends on the value of the digital audio information, more bits being replaced in the case of larger values than in the case of smaller values, B. at the system output side (SA) a. detecting the temporal position of the reference code words and the mixed code words of the code word groups (CW1, CW2) by means of the synchronising information (T4), b. separating the bits representing the additional information (Z-SIG) from the mixed code words and filling the vacated bit positions with bits of suitable significance from a substitution auxiliary-signal source (SQ), c. decoding the reconstructed code words of the main information (H-SIG/C) and of the additional information (Z-SIG) recovered from the mixed code words.
Claim 8
Dependent Claim
20 words
A method as claimed in Claim 6, characterized in that the substitution auxiliary-signal source (SQ) is a digital dither oscillator.
References Cited (Backward Citations)
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