Signal processing utilizing a tree-structured array

Abstract

A communication system for sending a sequence of symbols on a communication link. The system includes a transmitter for placing information indicative of the sequence of symbols on the communication link and a receiver for receiving the information placed on the communication link by the transmitter. The transmitter includes a clock for defining successive frames, each of the frames including M time intervals, where M is an integer greater than 1. A modulator modulates each of M carrier signals with a signal related to the value of one of the symbols thereby generating a modulated carrier signal corresponding to each of the carrier signals. The modulated carriers are combined into a sum signal which is transmitted on the communication link. The carrier signals include first and second carriers, the first carrier having a different bandwidth than the second carrier. In one embodiment, the modulator includes a tree-structured array of filter banks having M leaf nodes, each of the values related to the symbols forming an input to a corresponding one of the leaf nodes. Each of the nodes includes one of the filter banks. Similarly, the receiver can be constructed of a tree-structured array of sub-band filter banks for converting M time-domain samples received on the communication link to M symbol values.Signal processing is performed by splitting a signal into subbands using a plurality of filter banks connected to form a tree-structured array. The filter banks are connected so that the signal is split into subbands of different size. The subbands can be designed to approximate the bands of the human auditory system for audio signal processing applications. Reconstruction of signals using a plurality of synthesis filter banks connected to form a tree-structured array is also performed.

Description

[0001]This applicationThis application is a Division of U.S. Reissue application No. 10 / 603,833 filed Jun. 26, 2003, now abandoned, which is a Reissue of U.S. application No. 08 / 804,909, filed Feb. 25, 1997, now U.S. Pat. No. 6,252,909, issued Jun. 26, 2001. U.S. application No. 08 / 804,909, filed Feb. 25, 1997, is a Continuation-in-Part of U.S. patent application Ser. No. 08 / 307,331, filed Sep. 16, 1994, Pat. No. 5,606,642, which is a division of U.S. Patent Application Ser. No. 07 / 948,147, filed Sep. 21, 1992, Pat. No. 5,408,580.FIELD OF THE INVENTION[0002]The present invention relates to data transmission systems, and more particularly, to an improved multi-carrier transmission system. The present invention further relates to audio compression and decompression systems.BACKGROUND OF THE INVENTION[0003]In prior art multi-carrier systems, a communication path having a fixed bandwidth is divided into a number of sub-bands having different frequencies. The width of the sub-bands is ch...

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