A time-delay digital tanlock loop

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A time-delay digital tanlock loop

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Title: A time-delay digital tanlock loop
Author: Hussain, Z.M; Boashash, B; Hassan-Ali, M; Al-Araji, S.R.
Abstract: We propose a nonuniform sampling digital tanlock loop (DTL) that utilizes a constant time-delay unit instead of the constant 90° phase shifter The new structure reduces the complexity of implementation and avoids many of the practical problems associated with the digital Hilbert transformer like the approximations and frequency limitations. The time-delay digital tanlock loop(TDTL) preserves the most important features of the conventional DTL (CDTL), such as reduced sensitivity to the variation of the signal power. It also introduces improvement over the first-order CDTL under suitable choice of the circuit parameters. The first- and second-order loops are analyzed for locking conditions and steady-state phase error.
Description: This paper presents a nonuniform-sampling time-delay digital tanlock loop (TDTL) where the conventional constant 90 degree phase shifter is replaced by a time-delay unit. This is to avoid many of the practical problems associated with the implementation of the digital Hilbert transformer, (Additional details can be found in the comprehensive book on Time-Frequency Signal Analysis and Processing (see http://www.elsevier.com/locate/isbn/0080443354). In addition, the most recent upgrade of the original software package that calculates Time-Frequency Distributions and Instantaneous Frequency estimators can be downloaded from the web site: www.time-frequency.net. This was the first software developed in the field, and it was first released publicly in 1987 at the 1st ISSPA conference held in Brisbane, Australia, and then continuously updated).
URI: http://hdl.handle.net/10576/10763
Date: 2001-08

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