EP0209839A2
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EP
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Apparatus and method for decoding a sequence of pseudo-ternary digital signals
Assignee: International Business Machines Corp
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Filing: 1986-07-15
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Granted: —
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Expires: 2006-07-15
Abstract
Abstract The present invention relates to apparatus for decoding a sequence of pseudo-ternary digital signals (100), wherein each signal can have one of three possible values, a zero value, a positive value or a negative value. The apparatus is of the type which comprises storage means (116) for storing an estimator (E) representing each of the possible positive and negative values, sampling means (102) for sampling the sequence of signals (100) at predetermined time intervals and obtaining sample signals (S), and comparison means (94, 112) for comparing each sample signal (S) with the estimator (E) to determine whether each sample signal (S) is equivalent to any one of the possible values. Apparatus in accordance with the invention is characterised in that the comparison means comprises estimator changing means (114) for changing the current amplitude of the estimator (E) to the amplitude of a sample signal (S) when the amplitude of the sample signal appears to represent one of the possible positive or negative values more accurately than the current amplitude of the estimator. The invention also relates to a method of decoding a sequence of pseudo-ternary digital signals, wherein each signal can have one of three possible values, a zero value, a positive value or a negative value, utilising apparatus as defined above.
Inventors
- 👤 John Scott Eggenberger
- 👤 David Price Turner
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 01:41
CPC Classifications
H; H03; H03M; H03M5/00; H03M5/02; H03M5/16; H03M5/18; H03M13/00; H03M13/03; H03M13/23
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
154 words
Apparatus for decoding a sequence of pseudo-ternary digital signals (100), wherein each signal can have one of three possible values, a zero value, a positive value or a negative value, comprising storage means (116) for storing an estimator (E) representing each of said possible positive and negative values, sampling means (102) for sampling said sequence of signals (100) at predetermined time intervals and obtaining sample signals (S), and comparison means (94, 112) for comparing each sample signal (S) with said estimator (E) to determine if each sample signal (S) is equivalent to any one of said possible values, characterised in that said comparison means comprises estimator changing means (114) for changing the current amplitude of said estimator (E) to the amplitude of a sample signal (S) when the amplitude of said sample signal appears to represent one of said possible positive or negative values more accurately than the current amplitude of said estimator (E).
Claim 2
Dependent Claim
154 words
Apparatus for decoding a sequence of pseudo-ternary digital signals (100), wherein each signal can have one of three possible values, a zero value, a positive value or a negative value, comprising storage means (116) for storing an estimator (E) representing each of said possible positive and negative values, sampling means (102) for sampling said sequence of signals (100) at predetermined time intervals and obtaining sample signals (S), and comparison means (94, 112) for comparing each sample signal (S) with said estimator (E) to determine if each sample signal (S) is equivalent to any one of said possible values, characterised in that said comparison means comprises estimator changing means (114) for changing the current amplitude of said estimator (E) to the amplitude of a sample signal (S) when the amplitude of said sample signal appears to represent one of said possible positive or negative values more accurately than the current amplitude of said estimator (E).
Claim 3
Dependent Claim
57 words
Apparatus as claimed in Claim 1, characterised in that said estimator changing means comprises detection means for detecting that the amplitude of a sample signal (S) is greater than the current amplitude of said estimator (E), and replacing means (114) for replacing the current amplitude of said estimator (E) with the amplitude of said sample signal (S).
Claim 4
Dependent Claim
32 words
Apparatus as claimed in Claim 2 characterised in that said comparison means comprises means for interpreting the current amplitude of said estimator (E) as representing a zero value signal in said sequence.
Claim 5
Dependent Claim
64 words
Apparatus as claimed in any one of the preceding claims, characterised in that said comparison means comprises detection means for detecting that the amplitude of a sample signal (S) is less than the current amplitude of said estimator (E), and means, responsive to the output of said detection means, for confirming that said estimator (E) represents one of said possible positive or negative values.
Claim 6
Dependent Claim
73 words
Apparatus as claimed in any one of the preceding claims, characterised in that said comparison means comprises additional detection means for detecting that the amplitude of a sample signal (S) is less than the current amplitude of said estimator (E) by more than a predetermined amount (A), and means, responsive to the output of said additional detecting means, for identifying said sample signal (S) as repesenting a zero value signal in said sequence.
Claim 7
Dependent Claim
125 words
Apparatus as claimed in any one of the preceding claims characterised in that said comparison means operates in two alternative modes, a first mode in which it detects sample signals (S) which are equivalent to said possible positive value and a second mode in which it detects sample signals (S) which are equivalent to said possible negative signals, and in that said apparatus comprises switch means (80) for switching said comparison means from said first mode of operation into said second mode of operation when it has detected a sample signal (S) equivalent to said possible positive value, and from said second mode of operation into said first mode of operation when it has detected a sample signal (S) equivalent to said possible negative value.
Claim 8
Independent Claim
137 words
A method of decoding a sequence of pseudo-ternary digital signals (100), wherein each signal can have one of three possible values, a zero value, a positive value or a negative value, comprising storing an estimator (E) representing each of said possible positive and negative values, sampling said sequence of signals at predetermined time intervals and obtaining sample signals (S), and comparing each sample signal (S) with said estimator (E) to determine if each sample signal (S) is equivalent to any one of said possible values, characterised in that said comparison operation comprises changing the current amplitude of said estimator (E) to the amplitude of a sample signal (S) when the amplitude of said sample signal (S) appears to represent one of said possible positive or negative values more accurately than the current amplitude of said estimator (E).
Claim 9
Independent Claim
137 words
A method of decoding a sequence of pseudo-ternary digital signals (100), wherein each signal can have one of three possible values, a zero value, a positive value or a negative value, comprising storing an estimator (E) representing each of said possible positive and negative values, sampling said sequence of signals at predetermined time intervals and obtaining sample signals (S), and comparing each sample signal (S) with said estimator (E) to determine if each sample signal (S) is equivalent to any one of said possible values, characterised in that said comparison operation comprises changing the current amplitude of said estimator (E) to the amplitude of a sample signal (S) when the amplitude of said sample signal (S) appears to represent one of said possible positive or negative values more accurately than the current amplitude of said estimator (E).
Claim 10
Dependent Claim
51 words
A method as claimed in Claim 7, characterised in that said estimator changing operation comprises detecting that the amplitude of a sample signal (S) is greater than the current amplitude of said estimator (E), and replacing the current amplitude of said estimator (E) with the amplitude of said sample signal (S).
Claim 11
Dependent Claim
31 words
A method as claimed in Claim 8 characterised in that said comparison operation comprises interpreting the current amplitude of said estimator (E) as representing a zero value signal in said sequence.
Claim 12
Independent Claim
63 words
A method as claimed in any one of claims 7, 8 or 9, characterised in that said comparison operation comprises detecting that the amplitude of a sample signal (S) is less than the current amplitude of said estimator (E), and, in response to the result of this detection operation, confirming that said estimator (E) represents one of said possible positive or negative signals.
Claim 13
Independent Claim
73 words
A method as claimed in any one claims 7, 8, 9, 10. 11 or 12, characterised in that said comparison operation comprises additionally detecting that the amplitude of a sample signal (S) is less than the amplitude of said estimator (E) by more than a predetermined amount (A), and, in response to the result of this additional detection operation, identifying said sample signal (S) as repesenting a zero value signal in said sequence.
Claim 14
Independent Claim
136 words
A method as claimed in any one of claims 7, 8, 9, 10, or 11 characterised in that said comparison operation operates in two alternative modes of operation, a first mode in which it results in the detection of sample signals (S) which are equivalent to said possible positive value and a second mode in which it results in the detection of sample signals (S) which are equivalent to said possible negative signals, and switches from said first mode of operation into said second mode of operation when it has resulted in the detection of a sample signal (S) equivalent to said possible positive value, and from said second mode of operation into said first mode of operation when it has resulted in the detection of a sample signal (S) equivalent to said possible negative value.
References Cited (Backward Citations)
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