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E. 5 ms). e. 10 ms). To avoid hard transitions at frame boundaries when the HVXC or HILN decoders are switched on or off, the respective decoder output signals are faded in and out smoothly. For the HVXC decoder a 20 ms linear fade is applied when it is switched on or off. The HILN decoder requires no additional fading because of the smooth synthesis windows utilized in the HILN synthesizer. e. force numLine = 0, harmFlag = 0, noiseFlag = 0) if the current bitstream frame contains no „HILNframe()“.

The value of N/T might be different from the sampling frequency of the audio signal being synthesized which is specified by SamplingFrequency in the AudioSpecificConfig(). Some parameters of the previous frame (names starting with "previous“) are taken out of a frame to frame memory which has to be reset before decoding the first frame of a bitstream. First the envelope functions previousEnv(t) and env(t) of the previous and current frame are calculated according to the following rules: If envFlag = 1 then the envelope function env(t) is derived from the envelope parameters t_max, r_atk, and r_dec.

Coded fundamental frequency of the harmonic lines. Coded frequency stretching parameter of the harmonic lines. Coded LAR LPC parameters of the harmonic lines. A field indicating the number of noise parameters in the current frame. A flag indicating that the noise is continued from the previous frame. A flag indicating that noise envelope data is present in the current frame. Coded amplitude change of the noise. Coded amplitude of the noise. Coded noise envelope parameter: time of maximum Coded noise envelope parameter: attack rate.

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