Results 251 to 260 of about 88,237 (307)
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Coretractable modules relative to \(\delta\)
2020Summary: Let \(R\) be a ring and \(M\) a right \(R\)-module. We call \(M\), a \(\delta(M)\)-coretractable module if for every proper submodule \(N\) of \(M\) containing \(\delta(M)\), there is a nonzero homomorphism from \(M/N\) to \(M\). We investigate some conditions which under two concepts \(\delta(M)\)-coretractable and coretractable coincide. For
Moniri Hamzekolaee, Ali Reza +2 more
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Multistage sigma-delta modulation
IEEE Transactions on Information Theory, 1989A theoretical basis is provided for multistage sigma-delta modulation (MSM), which is a cascade realization of several single-loop sigma-delta modulators with a linear combinatorial network. Equations are derived describing the output and the quantization noise of MSM for an arbitrary input signal, and the noise-shaping characteristic of MSM is ...
Wu Chou, Ping Wah Wong, Robert M. Gray
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Bell System Technical Journal, 1972
We show how the steady-state distribution and the mean squared error of a delta modulator with an ideal integrator can be computed exactly when the input signal to the modulator is a stationary Gaussian process with a rational power spectral density.
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We show how the steady-state distribution and the mean squared error of a delta modulator with an ideal integrator can be computed exactly when the input signal to the modulator is a stationary Gaussian process with a rational power spectral density.
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A Modified Adaptive Delta Modulator
IEEE Transactions on Communications, 1981This paper presents the results of a study in data compression of adaptive delta modulated video signals. The Song mode ADM is first investigated at a sampling rate of 16 Mbits/s and shown not to produce enough redundancy to warrant entropy encoding. We then present a modified adaptive delta modulator algorithm that operates at a sampling rate of 16 ...
Joseph Barba +4 more
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Analysis of a delayed delta modulator
IEEE Transactions on Information Theory, 1986While delta modulation (DM) simply compares the current predictive estimate of the input with the current sample, delayed delta modulation (DDM) also compares with the upcoming sample so as to detect and anticipate slope overloading. Since this future sample must be available before the present output is determined and the estimate updated, delay is ...
Neil L. Gerr, Stamatis Cambanis
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Proceedings of the 2003 International Symposium on Circuits and Systems, 2003. ISCAS '03., 2003
/spl Sigma//spl Delta/ modulators for portable applications are presented operating within a large range of supply voltages. A 2/sup nd/ order and a cascaded 3rd order modulator are designed in Switched-Opamp (SO) technique with common mode level shift.
Jens Sauerbrey +3 more
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/spl Sigma//spl Delta/ modulators for portable applications are presented operating within a large range of supply voltages. A 2/sup nd/ order and a cascaded 3rd order modulator are designed in Switched-Opamp (SO) technique with common mode level shift.
Jens Sauerbrey +3 more
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Hybrid Companding Delta Modulation
IEEE Transactions on Communications, 1981We present a reasonably complete account of an improved adaptive delta modulation (ADM) system called hybrid companding delta modulation (HCDM). The HCDM system that is far superior to continuously variable slope DM (CVSD) or constant factor DM (CFDM) is advantageous, particularly for speech coding. It employs both syllabic and instantaneous companding
Chong Kwan Un +2 more
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Oversampled Sigma-Delta Modulation
IEEE Transactions on Communications, 1987Summary: Oversampled sigma-delta modulation has been proposed as a practical implementation for high rate analog-to-digital conversion because of its simplicity and its robustness against circuit imperfections. To date, mathematical developments of the basic properties of such systems have been based either on simplified continuous-time approximate ...
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An adaptively sampled delta modulator
ICASSP '80. IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005A new approach to adaptive delta modulation is presented. This method adaptively adjusts the output pulse stream in a way that effectively provides signal tracking with no idle noise. Whereas conventional adaptive delta modulation schemes have a changing step size, the present approach can be viewed as adjusting the sample interval to achieve improved ...
H. F. Vanlandingham, J. F. Bogdanski Jr.
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IEEE Transactions on Communications, 1992
A modulo sigma-delta modulator is introduced, and the behavior of the quantization error is derived. The system consists of a modulo limiter followed by a sigma-delta modulator. The limiter confines the input to the no-overload region of the sigma-delta modulator, and the modulo arithmetic performed by the limiter is amenable to recently developed ...
Wu Chou, Robert M. Gray
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A modulo sigma-delta modulator is introduced, and the behavior of the quantization error is derived. The system consists of a modulo limiter followed by a sigma-delta modulator. The limiter confines the input to the no-overload region of the sigma-delta modulator, and the modulo arithmetic performed by the limiter is amenable to recently developed ...
Wu Chou, Robert M. Gray
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