Patent
Piecewise linear predictive coding system
TLDR
In linear predictive coding (LPC) as discussed by the authors, the input analog signal is divided by filters into multiple, contiguous, substantially equal bandwidth signal components and each component is digitized and processed by a separate standard LPC transmit-receive system.Abstract:
Improved fidelity and reduced computational requirements are achieved in a linear predictive coding (LPC) system that utilizes multichannel signal processing and reduced sampling rates. The input analog signal is divided by filters into multiple, contiguous, substantially equal bandwidth signal components and each component is digitized and processed by a separate standard LPC transmit-receive system. Each transmit-receive system operates at a sampling rate that is equal to the normal sampling rate for the signal being processed divided by the number of channels or signal components used. The received signal components are filtered, converted to analog, and summed.read more
Citations
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References
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Patent
Feedback residue compression for digital speech systems
TL;DR: In this paper, a digital speech compression system using a predictive feedback loop is described, which consists of a first adder into which the digital signal is fed followed by a quantizer and a compression logic.
Patent
Speech signal pitch detector using prediction error data
TL;DR: In this article, the pitch periods in a complex speech signal are determined by evaluating the error in predicting the value of a sample of the signal on the basis of past sample values, and by locating samples for which the prediction error is large.
Patent
Speech predictive encoding communication system
TL;DR: In this paper, a sample assignment word (SAW) is used to identify the circuits corresponding to the unpredictable samples, and the receiver updates the stored samples which were transmitted during previous frames as unpredictable samples by substituting the received unpredictable samples for the stored instances in accordance with the SAW, thereby enabling proper reconstruction of all samples in the given frame.
Patent
Prediction differential pulse code modulation system with adaptive compounding
TL;DR: In this article, the adaptive differential PCM transmission system uses a first-order prediction and a simple quantizing step-wise adaptation to improve signal-to-quantizing noise ratio.