Title:
LOW BIT-RATE AUDIO ENCODING
Document Type and Number:
WIPO Patent Application WO2005024783
Kind Code:
A8
Abstract:
In a sinusoidal audio encoder a number of sinusoids are estimated per audio segment. A sinusoid is represented by frequency, amplitude and phase. The invention uses a track dependent quantization of phase. A track is encoded with a suitable initial (e.g. frequency dependent) quantization grid that is chosen among a set of possible initial grids that may vary from fine to coarse. If, in a series of time segments the frequency variation in a particular track is smaller than a predetermined value, the track is quantized using a finer quantization grid. The invention gives a significant improvement in decoded signal quality, especially for low bit-rate quantizers.
Inventors:
HOTHO GERARD H (NL)
GERRITS ANDREAS J (NL)
GERRITS ANDREAS J (NL)
Application Number:
PCT/IB2004/051564
Publication Date:
May 26, 2005
Filing Date:
August 25, 2004
Export Citation:
Assignee:
KONINKL PHILIPS ELECTRONICS NV (NL)
HOTHO GERARD H (NL)
GERRITS ANDREAS J (NL)
HOTHO GERARD H (NL)
GERRITS ANDREAS J (NL)
International Classes:
G10L19/093; (IPC1-7): G10L19/08
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