Abstract: A multi-mode mobile station independently determines the radio signal quality of a serving mobile system by evaluating the error rate associated with the received forward-link-channel messages. In response to a determination that the calculated error rate is greater than an acceptable threshold level, the mobile station then attempts to access an alternative service system capable of providing better and more reliable telecommunications service.

Abstract: A multi-mode mobile station independently determines the radio signal quality of a serving mobile system by evaluating the error rate associated with the received forward-link-channel messages. In response to a determination that the calculated error rate is greater than an acceptable threshold level, the mobile station then attempts to access an alternative service system capable of providing better and more reliable telecommunications service.

Abstract: A method for encoding and decoding digital signals, particularly speech signals, by separating the original signal into a linear and nonlinear portions, the nonlinear portion may have linear aspects. The linear portion is encoded by LPC techniques and the nonlinear portion is encoded by use of a fractal transform. The encoded signal consists of LPC filter coefficients and fractal transform coefficients. The encoded signal is decoded by separating the LPC coefficients and fractal coefficients, using the LPC coefficients to generate an LPC filter, decoding the fractal coefficients using a fractal transform decoding method to obtain an error signal, and exciting the LPC filter with the decoded error signal to obtain decoded digital signals.

Abstract: An encoder and decoder system for compressing discrete data sequences is disclosed. The encoder includes a self-affine map generator and a backward adaptive map generator which model source vectors formed from a discrete data sequence. The self-affine map generator uses known modeling techniques to determine map parameters for mapping functions. The mapping functions are evaluated by computing a collage error and the mapping function corresponding to the smallest collage error is selected. The backward adaptive map generator determines map parameters for mapping functions which map vectors previously generated to represent the discrete data sequence to the source vector. A distance measurement is computed for each target vector/mapping function combination and the mapping function corresponding to the smallest distance measurement is selected.