An efficient multiplexing technique for packet-switched voice-data networks

Article Abstract:

A new computationally-efficient packet-switched voice-data network multiplexing technique uses a synchronous frame structure with the same duration as the voice packet generation interval to enable the synchronous transmission of voice packets without loss or clipping. Packets are sequenced through the use of inter-arrival--delay--times and sequence numbers. The intervals and active voice periods are derived from the received packet streams through use of the frame format. The frame structure is applicable to a variety of enhanced services with varying voice transmission rates and packet sizes.

Computer telephony, Systems analysis, Voice mail, Packet switches, Packet switching, Multiplexing, Integrated Voice/Data, System Design, Packet Switch, Digitized Voice, Packet Switching Technology, Digital Multiplexing

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Fast sequential least squares design of FIR filters with linear phase

Article Abstract:

A new, fast, computationally efficient adaptive filtering algorithm is developed for the sequential least squares estimation of linear phase digital FIR filters. Such filters are useful in digital signal processing for the elimination of noise that may cause frequency dispersion. The algorithm only requires a number of multiplications per data point equal to ten times the filter order. Computer simulations reveal the new algorithm to perform better than the LMS gradient and modified fast Kalman algorithms.

Filtering

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On the convergence speed of nonlinear least-squares IIR adaptive filter

Article Abstract:

A simulation demonstrates that an infinite impulse response (IIR) adaptive digital filter (ADF) based on a nonlinear least-squares (NLS) algorithm offers greater convergence speed than other known IIR ADFs. This is particularly so for low order cases, as is demonstrated by the comparison of the NLS IIR ADF with a modified recursive Gauss-Newton IIR ADF. Development of the NLS IIR ADF algorithm and simulation results are described.

Cost benefit analysis, Signal processing, technical

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