초록 ▼

A signal transmission system assigns portions of an image or other type of signal to packets so as to provide an approximate equalization of the signal energy across the packets. As a result, the quality of a reconstructed signal in the presence of a given amount of packet loss is substantially the

A signal transmission system assigns portions of an image or other type of signal to packets so as to provide an approximate equalization of the signal energy across the packets. As a result, the quality of a reconstructed signal in the presence of a given amount of packet loss is substantially the same regardless of the particular packets which are lost. In one possible implementation, the signal is separated into subbands using a cosine-modulated orthonormal filter bank. The subbands are then assigned to packets in accordance with an energy equalization algorithm such that the cumulative energies of the packets are approximately equal. In another implementation, an image signal is scrambled such that pixels in the image are mapped to different spatial positions, thereby producing a whitened image. The whitened image is then separated into subbands, and the subbands are assigned deterministically to the packets. Similar whitening techniques can be also used with non-image signals. These and other implementations of the invention provide graceful degradation in reconstructed signal quality in the presence of packet loss during transmission.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method of transmitting a signal over a network, comprising the steps of:assigning portions of the signal to packets; andtransmitting the packets over the network to a receiver, wherein the assigning step includes assigning portions of the signal to the packets such th

[ What is claimed is:] [1.]1. A method of transmitting a signal over a network, comprising the steps of:assigning portions of the signal to packets; andtransmitting the packets over the network to a receiver, wherein the assigning step includes assigning portions of the signal to the packets such that reconstructed signal quality at the receiver, for a given amount of packet loss in transmission, is substantially uniform regardless of which of the packets are lost.