Coding of spectral coefficients of a spectrum of an audio signal

Decoder according to claim 20, wherein the decoder is configured such that the relative spectral distance increases with increase of the information concerning the shape of the spectrum wherein the information concerning a shape of the spectrum comprises a measure of a pitch or periodicity of the audio signal.

Encoder for encoding spectral coefficients of a spectrogram of an audio signal, composed of a sequence of a spectra, the encoder being configured to

• encode the spectral coefficients along a spectrotemporal path which scans the spectral coefficients spectrally from low to high frequency within one spectrum and then proceeds with spectral coefficients of a temporally succeeding spectrum,
• encode, by entropy encoding, a currently to be encoded spectral coefficient of a current spectrum depending, in a context-adaptive manner, on a template of previously encoded spectral coefficients including a spectral coefficient belonging to the current spectrum, the template being positioned at a location of the currently to be encoded spectral coefficient, with adjusting at least one of a relative spectral distance between the spectral coefficient belonging to the current spectrum and the currently to be encoded spectral coefficient or a relative spectral distance between the spectral coefficient belonging to the current spectrum and a further spectral coefficient of the template which belongs to the current spectrum depending on an information concerning a shape of the spectrum.

Method for decoding spectral coefficients of a spectrogram of an audio signal, composed of a sequence of a spectra, the method comprising

• decoding the spectral coefficients along a spectrotemporal path which scans the spectral coefficients spectrally from low to high frequency within one spectrum and then proceeds with spectral coefficients of a temporally succeeding spectrum,
• decoding, by entropy decoding, a currently to be decoded spectral coefficient of a current spectrum depending, in a context-adaptive manner, on a template of previously decoded spectral coefficients including a spectral coefficient belonging to the current spectrum, the template being positioned at a location of the currently to be decoded spectral coefficient, with adjusting at least one of a relative spectral distance between the spectral coefficient belonging to the current spectrum and the currently to be decoded spectral coefficient or a relative spectral distance between the spectral coefficient belonging to the current spectrum and a further spectral coefficient of the template which belongs to the current spectrum depending on an information concerning a shape of the spectrum.

Method for encoding spectral coefficients of a spectrogram of an audio signal, composed of a sequence of a spectra, the method comprising

• encoding the spectral coefficients along a spectrotemporal path which scans the spectral coefficients spectrally from low to high frequency within one spectrum and then proceeds with spectral coefficients of a temporally succeeding spectrum,
• encoding, by entropy encoding, a currently to be encoded spectral coefficient of a current spectrum depending, in a context-adaptive manner, on a template of previously encoded spectral coefficients including a spectral coefficient belonging to the current spectrum, the template being positioned at a location of the currently to be encoded spectral coefficient, with adjusting at least one of a relative spectral distance between the spectral coefficient belonging to the current spectrum and the currently to be encoded spectral coefficient or a relative spectral distance between the spectral coefficient belonging to the current spectrum and a further spectral coefficient of the template which belongs to the current spectrum depending on an information concerning a shape of the spectrum.