Journal ArticleDOI
A single-chip VLSI echo canceler
D. L. Duttweiler,Y. S. Chen +1 more
TLDR
In this paper, a single-chip VLSI echo canceler has been fabricated in NMOS(N-channel metaloxide semiconductor), which has a 128-tap (16-ms) delay line and a white-noise convergence rate of 70 dB/s.Abstract:
A single-chip VLSI (very large-scale integration) echo canceler has been fabricated in NMOS(N-channel metal-oxide semiconductor). The canceler has a 128-tap (16-ms) delay line and a white-noise convergence rate of 70 dB/s. The chip measures 313 by 356 mils and contains 35,000 devices.read more
Citations
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Journal ArticleDOI
Silencing echoes on the telephone network
M.M. Sondhi,D.A. Berkley +1 more
TL;DR: Echo cancellers may be applied to the network in a number of ways and the development of a VLSI canceller chip promises inexpensive implementation of these applications.
Journal ArticleDOI
Echo Cancellation in Speech and Data Transmission
TL;DR: This tutorial paper reviews echo cancellation techniques as applied to both voice and data transmission applications, with application to both digital subscriber loop and voiceband data transmission.
Journal ArticleDOI
Adaptive filter performance with nonlinearities in the correlation multiplier
TL;DR: In this paper, the convergence rate and misalignment noise of adaptive transversal filters with arbitrary correlation multiplier nonlinearities are derived and a power-of-two multiplier is suggested as a better alternative.
Journal ArticleDOI
Echo cancellation and applications
TL;DR: Practical echo cancellation techniques, in particular, those used in telecommunications, are reviewed and current international standardization activities are discussed, and echo canceler implementation considerations are set forth.
Journal ArticleDOI
Decomposition of binary integers into signed power-of-two terms
TL;DR: In this article, the completeness, uniqueness, and resolving power of signed powers-of-two representations are studied, and circuits for extracting a prescribed number of signed power of two terms whose sum is the closest approximation to a given integer are presented.
References
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Journal ArticleDOI
An adaptive echo canceller
TL;DR: A novel method is presented for echo-cancellation in long distance telephone connections by means of a replica of the echo synthesized and subtracted from the return signal and shown that under ideal conditions, the echo converges to zero.
Journal ArticleDOI
A Twelve-Channel Digital Echo Canceler
TL;DR: A recently constructed 12-channel digital echo canceler that interfaces directly with the 8-bit μ255 PCM now standard for digital transmission in the telephone plant is described.
Journal ArticleDOI
Echo Canceler with Two Echo Path Models
TL;DR: An adaptive echo canceler with two echo path models is proposed to overcome the false adaptation problem for double-talking and it is shown that virtually complete double- talking protection is actually realizable by the new method.
Journal ArticleDOI
A Phase Adaptive Structure for Echo Cancellation
TL;DR: This paper presents a digital phase-adaptive structure for cancellation which will automatically compensate for echo path frequency offsets as large as 0.001 of the sampling rate without any reduction in return/loss enhancement.
Journal ArticleDOI
Echo cancellation on time-variant circuits
N. Demytko,K.S. English +1 more
TL;DR: In this article, the phase-roll problem was examined and two solutions were discussed; use of compensating frequency offsets and cancellers with high-speed convergence, and a prototype capable of satisfactory performance with speech on circuits exhibiting phase roll rates up to 1.8 Hz was described.