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The convolutive blind source separation (BSS) problem can be solved efficiently in the frequency domain, where instantaneous BSS is performed separately in each frequency bin. However, the permutation ambiguity in each frequency bin should be resolved so that the separated frequency components from the same source are grouped together. To solve the(More)
The fast affine projection (FAP) adaptation algorithm possesses a superior convergence property, but most of its implementations so far suffer from instability resulting from error propagation and accumulation in a matrix inversion process. In this paper, a stable yet simple FAP algorithm is proposed, where the matrix inversion is performed based on an(More)
This paper proposes two noniterative approaches to solve a symmetric linear system associated with the fast affine projection adaptation algorithm. The first approach, using matrix LDL<sup>T</sup> factorization, can provide an exact solution at a moderate complexity, in contrast with the fact that existing stable approaches are all approximate. Based on a(More)
In general, it is difficult for conventional adaptive interference cancellation schemes to improve speech intelligibility in the presence of interference whose source is obtained asynchronously with the corrupted target speech. This is because there are inevitable timing drifts between the two inputs to the system. To address this problem, a(More)
An echo canceller removes undesired echo in fullduplex speech communication. The cancellation is done by modeling the echo path impulse response with an adaptive finite impulse response filter and subtracting the echo estimate from the received signal. A typical diagram of an echo canceller is depicted in Figure 1. The signal x(n) and v(n) represent the(More)
  • Heping Ding
  • 2004 IEEE International Conference on Acoustics…
  • 2004
This paper proposes a scheme of transmitting or storing a wideband audio stream in a channel or storage medium which is narrowband in nature and with a low resolution data format, such as an 8-bit companded one. In the proposed scheme, signal components in the upper-band part of the wideband beyond the narrowband - are encoded and then the code is embedded(More)
  • Heping Ding
  • IEEE Workshop on Applications of Signal…
  • 2005
This paper proposes two patent-pending stable approaches to solve a symmetric positive-definite linear system associated with the fast affine projection (FAP) adaptation algorithm. The first approach can provide an exact solution at a relatively high complexity. The second, based on a novel reciprocating recursion algorithm, gives a reasonable approximate(More)