US 7,680,651 B2 · Signal modification method for efficient coding of speech signals

Abstract

In accordance with the exemplary embodiments of the invention there is disclosed at least a method and apparatus for determining a long-term-prediction delay parameter characterizing a long term prediction in a technique using signal modification for digitally encoding a sound signal, the sound signal is divided into a series of successive frames, a feature of the sound signal is located in a previous frame, a corresponding feature of the sound signal is located in a current frame, and the long-term-prediction delay parameter is determined for the current frame while mapping, with the long term prediction, the signal feature of the previous frame with the corresponding signal feature of the current frame. Each divided frame of the sound signal is partitioned into a plurality of signal segments, and at least a part of the signal segments of the frame are warped while constraining the warped signal segments inside the frame.

Claims44

Dependent claims

A method, comprising:

storing a sound signal in a storage medium;
dividing the sound signal into a series of successive frames;
locating, by a device, a pitch pulse in a previous frame of the successive frames;
locating a corresponding pitch pulse in a current frame of the successive frames;
and
forming a delay contour comprising determining a long term prediction delay parameter for the current frame by iterating a function, where the function is of a temporary time variable and locations of the pitch pulses in the previous and current frames, where the delay contour maps, with the long term prediction delay parameter, the pitch pulse of the previous frame to the corresponding pitch pulse of the current frame, and where the function is iterated backwards from the pitch pulse in the current frame towards the pitch pulse in the previous frame to equal a position of the pitch pulse in the previous frame.

3 more elements

An apparatus, comprising:

a first divider configured to divide a sound signal into a series of successive frames;
a detector configured to detect a pitch pulse in a previous frame of the series of successive frames;
a detector within a device configured to detect a corresponding pitch pulse in a current frame of the series of successive frames;
and
a module configured to form a delay contour comprising, a calculator configured to calculate a long term prediction delay parameter for the current frame by iterating a function, where the function is of a temporary time variable and locations of the pitch pulses in the previous and current frames, where the delay contour maps, with the long term prediction delay parameter, the pitch pulse of the previous frame to the corresponding pitch pulse of the current frame, and where the apparatus is configured to iterate the function backwards from the corresponding pitch pulse in the current frame towards the pitch pulse in the previous frame to equal a position of the pitch pulse in the previous frame.

2 more elements

Dependencies are inferred from the claim text.

Signal modification method for efficient coding of speech signals

Life of this patent

Signal modification method for efficient coding of speech signals

Life of this patent

Abstract

Claims44