Noise reduction method with self-controlling interference frequency
AssigneeDaimlerChrysler AG
InventorsMarkus Buck, Tim Haulick, Klaus Linhard
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Abstract
The present invention relates to a method with which speech is captured in a noisy environment with as high a speech quality as possible. To this end, a compact array of, for example, two single microphones is combined to form one system through signal processing methods consisting of adaptive beam formation and spectral subtraction. Through the combination with a spectral subtraction, the reference signal of the beam former is freed from speech signal components to the extent that a reference signal of the interference is formed and the beam former produces high gains.
Claims12
A noise reduction method in which a reference signal of the interference is produced for multi-channel interference compensation systems, the method comprising the steps of:
- reducing interference of a useful signal in a first channel via a spectral subtraction so as to define a reduced-interference signal, the useful signal also being carried in a second channel;
- and
- forming an interference reference signal by subtracting the reduced-interference signal from the useful signal in the second channel.
A noise reduction method for reducing noise in a received signal, the signal being received at a first input and a second input, the first input being connected to a first channel and the second input to a second channel, the method comprising the steps of:
- forming a primary signal representative of the received input as a function of the first channel and the second channel;
- reducing interference in a first channel via a spectral subtraction so as to define a reduced-interference signal;
- forming an interference reference signal by subtracting the reduced-interference signal from the second channel;
- and
- subtracting the interference reference signal from the primary signal to form an noise-reduced output.
Dependencies are inferred from the claim text.