APPARATUS AND METHOD IMPLEMENTING IMPROVED CONSEPTS FOR TCX LTP Russian patent published in 2018 - IPC G10L19/09 H03M7/30 

FIELD: acoustics.

SUBSTANCE: invention relates to the encoding and decoding of audio signals. Apparatus comprises a receiving interface for receiving a plurality of frames, delay buffer for storing samples of the audio signal, selection block for selecting a plurality of selected samples of the audio signal and a sample processor for processing selected audio signal samples to obtain recovered samples of the audio signal from the reconstructed audio signal. Sample selector is configured to select, if the current frame is received by the receive interface and if the current frame is not damaged, the plurality of selected samples of the audio signal from the audio samples stored in the delay buffer, depending on the pitch lag information contained in the current frame. In addition, the sample selector is configured to select, if the current frame is not received by the receive interface, or if the current frame is corrupted, the plurality of selected samples of the audio signal from the audio signals stored in the delay buffer, depending on the pitch lag information contained in the other frame received earlier by the reception interface.

EFFECT: increase the accuracy of reconstruction of audio signals.

13 cl, 17 dwg, 2 tbl