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Complexity-reduced signal transmission system

A transmission system and signal technology, applied in the field of transmission systems, can solve problems such as large computing burdens

Inactive Publication Date: 2003-07-09
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] Having to compute the synthesized speech signal for all excitation sequences leads to a considerable computational burden

Method used

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  • Complexity-reduced signal transmission system
  • Complexity-reduced signal transmission system
  • Complexity-reduced signal transmission system

Examples

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Embodiment Construction

[0031] according to figure 1 In the transmission system of , the input signal is applied to transmitter 2. In the transmitter 2, the input signal is encoded by an encoder according to the invention. The output signal of the encoder 4 is applied to the input of a transmission device 6 for transmitting the output signal of the encoder 4 to a receiver 10 via a transmission medium 8 . The operation of the transmission device may consist of modulating the (binary) signal from the encoder, possibly in binary form, on a carrier signal suitable for the transmission medium 8 . At receiver 10 the received signal is converted by front end 12 into a signal suitable for decoder 14 . Operations of the front end 12 may include filtering, demodulation and detection of binary symbols. Decoder 14 derives a reconstructed input signal from the output signal of front end 12 .

[0032] in accordance with figure 2 The input of the encoder 4 carrying the digitized input signal samples i[n] is c...

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Abstract

In a CELP coder, a comparison between a target signal and a plurality of synthetic signals is made. A synthetic signal is derived by filtering a plurality of excitation sequences by a synthesis filter having parameters derived from the target signal. The excitation signal, which results in a minimum error between the target signal and the synthetic signal, is selected. The search for the best excitation signal requires a substantial computational complexity. To reduce the complexity, a preselection of a small number of excitation sequences is made by selecting a small number of excitation sequences resembling the most backward filtered target signal. With this small number of excitation sequences a full complexity search is made. Due to the reduced number of excitation sequences involved in the final selection the required computational complexity is reduced.

Description

technical field [0001] The invention relates to a transmission system comprising a transmitter for transmitting an input signal to a receiver via a transmission channel, the transmitter comprising an encoder comprising an excitation sequence generator for generating several excitation sequences, And selection means, for selecting an excitation sequence from a plurality of excitation signals so that the error between the composite signal from said excitation sequence and the target signal from the input signal is minimized, the transmitter is used to send the representative selected excitation sequence to the receiver The receiver includes a decoder having an excitation sequence generator for deriving a selected excitation sequence from a signal representative of the selected excitation sequence, and a synthesis filter for deriving a composite signal from the excitation sequence. [0002] The invention also relates to a transmitter, an encoder, a transmission mode and an encodi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/12H03M7/30H04B1/62
CPCG10L19/12G10L2019/0013G10L19/04H04B1/62
Inventor F·武珀曼F·M·J·德邦特
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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