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Coded envelope enhancement parameter: decay rate. Coded frequency enhancement of i-th harmonic line. Coded phase of i-th harmonic line. Coded frequency enhancement of i-th individual line. Coded phase of i-th individual line. 1 HILN decoder tools The Harmonic and Individual Lines plus Noise (HILN) decoder utilizes a set of parameters which are encoded in the bitstream to describe the audio signal. 1 – HILN signal models signal model harmonic lines individual lines description group of sinusoidal signals with common fundamental frequency sinusoidal signals noise spectrally shaped noise signal parameters fundamental frequency and amplitudes of the spectral lines frequency and amplitude of the individual spectral lines spectral shape and power of the noise 36 The HILN decoder first reconstructs these parameters from the bitstream with a set of decoding tools and then synthesizes the audio signal based on these parameters using a set of synthesizer tools: • harmonic line decoder • individual line decoder • noise decoder • harmonic and individual line synthesizer • noise synthesizer The HILN decoder tools reconstruct the parameters of the harmonic and individual lines (frequency, amplitude) and the noise (spectral shape) as well as possible envelope parameters from the bitstream.

To change the speed, a correspondingly increased or decreased frame length N is used for the synthesis. 2 Enhanced synthesizer Since there is no enhancement data for noise components, there is no specific enhanced synthesizer mode for noise components. If noise is to be synthesized with enhancement data present for the other components, the basic noise synthesizer decoder can be used. However it has to be noted that if the HILN decoder is used as a core in a scalable coder no noise signal must be synthesized for the signal which is given to the enhancement decoder.

Instantaneous phase of line being synthesized. Synthesized output signal. Sampled synthesized output signal. Envelope flag in previous frame. Envelope parameter t_max in previous frame. Envelope parameter r_atk in previous frame. Envelope parameter r_dec in previous frame. Amplitude envelope function in previous frame. Total number of lines in previous frame. Amplitude of k-th line in previous frame. Frequency of k-th line in previous frame (in Hz). End phase of k-th line in previous frame (in rad).

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