Improvements to the Switched Parametric & Transform Audio Coder

In this paper, we introduce improvements to previous sines + transients + noise audio modeling systems, including new sinusoidal trajectory selection and quantization procedures. In previous work [1], the audio is first segmented into transient and non-transient regions. The transient region is modeled using traditional transform coding techniques, while the non-transient regions are modeled using parametric sines plus noise modeling. Because such a system contains a mix of parametric and non-parametric techniques, compressed-domain processing such as time-scale modifications are possible.