Envelope and Waveform Preservation

Two methods based on spectral envelope analsys are used for the envelope preservation : True Envelope, and Linear Predictive Coding. To choose a method, select an item in the Method menu.

Linear predictive coding (LPC) is a method for signal source modelling in speech signal processing, based on the source-filter model of speech signal^[1].

• Specify a number of poles for the LPC.

• Note that if a F₀ analysis was executed, the temporary name of the analysis will be displayed although the method doesn't resort to the F₀ analysis.

True envelope (TE) is one of the most efficient spectral envelope estimation techniques, designed to improve the results of the LPC. It is based on an F₀ estimation and also uses a number of orders, which is deduced from the F₀

• Specifiy a frequency in the Maximum Fundamental Frequency prompt (1).

• You can also se a previous F₀ analysis file for a better rendering, whic allows SuperVP to choose the relevant order number dynamically.

1. Check the Use Fundamental Frequency option

2. • Click on Select to open a dialogue window and select any F₀ analysis in the Analysis directory. Its name will then be displayed in the window (2).

   • If an F₀ analysis has been calculated and is shown in the AS window, a temporary analysis name will be displayed, and it will be used by default (3).

This mode is based on a Voiced/Unvoiced analysis, which allows to process the separate voiced and unvoiced parts of the signal separately.

You can use a previous voiced/unvoiced analysis file :

1. Check the Use VUV File option

2. • Click on Select to open a dialogue window and select any F₀ analysis in the Analysis directory. Its name will then be displayed in the window (2).

   • If a VUV analysis has been calculated and is shown in the AS window, a temporary analysis name will be displayed, and it will be used by default (3).