Bilateral Waveform Similarity Overlap-and-Add Based Packet Loss Concealment for Voice over IP

Abstract

This paper invested a bilateral waveform similarity overlap-and-add algorithm for voice packet lost. Since Packet lost will cause the semantic misunderstanding, it has become one of the most essential problems in speech communication. This investment is based on waveform similarity measure using overlap-and-Add algorithm and provides the bilateral information to enhance the speech signal reconstruction. Traditionally, it has been improved that waveform similarity overlap-and-add (WSOLA) technique is an effective algorithm to deal with packet loss concealment (PLC) for real-time time communication. WSOLA algorithm is widely applied to deal with the length adaptation and packet loss concealment of speech signal. Time scale modification of audio signal is one of the most essential research topics in data communication, especially in voice of IP (VoIP). Herein, the proposed the bilateral WSOLA (BWSOLA) that is derived from WSOLA. Instead of only exploitation one direction speech data, the proposed method will reconstruct the lost voice data according to the preceding and cascading data. The related algorithms have been developed to achieve the optimal reconstructing estimation. The experimental results show that the quality of the reconstructed speech signal of the bilateral WSOLA is much better compared to the standard WSOLA and GWSOLA on different packet loss rate and length using the metrics PESQ and MOS. The significant improvement is obtained by bilateral information and proposed method. The proposed bilateral waveform similarity overlap-and-add (BWSOLA) outperforms the traditional approaches especially in the long duration data loss.

Hybrid Packet Loss Concealment for Real-Time Networked Music Applications

“…Therefore, the mapping f θ (x) is obtained by taking F θ (x) and discarding the first N samples. This leaves us with a sequence of M samples that are combined with y AR as in (3).…”

“…Naive PLC systems simply replace the missing packets with silence (zero filling), comfort noise, or fragments of the previously received audio stream [1]. Aside from the simple repetition of the last-received packet [2], the latter kind of PLC can exploit information about the pitch and the correlation of valid and replaced waveform segments to make the data insertion seamless by minimizing discontinuities [3] as per, e.g., ITU-T Rec. G.711 [4].…”

WSOLA for Reconstruction of Prolonged Speech Signal

“…The WSOLA algorithm produces high quality speech output, is algorithmically and computationally efficient, and robust. The principle of WSOLA depends on wave similarity, and it conducts operations in the time domain [11].…”

An Overview on Networked Music Performance Technologies

“…''wavetable'' mode, since a continuously repeated packet will create a tone with a fundamental period equal to the buffer size). Better solutions minimize overlapping artifacts through some form of dynamic realignment based on synchronous OverLap and Add (OLA) or Pitch-Synchronous OLA [75]. Such methods rely on a quasi-periodic behavior of the audio stream or some pitch-related peculiarities of the waveshape.…”