Joint speech and audio coding combining sinusoidal modeling and wavelet packets
Márk Fék, Annamária R. Várkonyi-Kóczy, Jean‐Marc Boucher · 2001
This paper presents a joint speech and audio coding algorithm combining sinusoidal modeling and a perceptually adapted Wavelet Packet Transform (WPT). The input signal is limited to the band of 50-7000 Hz, and sampled at 16 kHz. The sinusoidal modeling uses a Sinusoidal Similarity Measure(SSM) to find stable sinusoidal components. A novel pitch harmonics based encoding is applied to encode the sinusoidal frequencies. The residual is obtained by extracting the re-synthesized sinusoids from the input, and is processed by a WPT simulating the critical bands of the Human Auditory System . Perceptual Noise Substitution (PNS) is applied in noisy WPT sub-bands to reduce the bit rate. The method provides nearly transparent quality for both speech and audio inputs. The mean bit rate of the compressed signal varies between 32-62 kbps depending on the input. Demonstration sound files are available at www-sc.enstbretagne.fr/˜fek/eurospeech01.