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US 8,190,427 B2Granted
Compander which uses adaptive pre-emphasis filtering on the basis of linear prediction
AssigneeSennheiser electronic GmbH & Co. KG
InventorsJürgen Peissig, Udo Zoelzer, Florian Keiler, Martin Holters
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Abstract
A compressor device for a compander system has a level detecting/control device and a pre-emphasis device for carrying out an adaptive pre-emphasis filtering. The invention is also directed to an expander device for a compander system with a level detecting/control device and a de-emphasis device for carrying out an adaptive de-emphasis filtering.
Claims11
A compressor device for a compander system, comprising:
- a pre-emphasis device for carrying out an adaptive pre-emphasis filtering of an input signal;
- an adding unit for adding the output of the pre-emphasis device to the input signal;
- a level detecting/control device for detecting a level of an output signal of the compressor device;
- a multiplying unit for multiplying an output of the adding unit with an output of the level detecting/control device, where the output of the multiplying unit corresponds to the output of the compressor device;
- and
- a filter adaption unit which receives the output signal of the compressor device as an input signal and performs an adaption of the pre-emphasis device by updating a filter coefficient according to a linear prediction based on an estimated autocorrelation of each output sample.
3 more elements
An expander device for a compander system, comprising:
- a level detecting/control device for detecting a level of an input signal;
- a divider for dividing the output of the level detecting/control device from the input signal;
- a de-emphasis device for carrying out an adaptive de-emphasis filtering of an output signal of the expander device;
- an adding unit which is adapted to subtract the output signal of the de-emphasis device from the output signal of the divider, where the output signal of the adding unit constitutes the output of the expander device;
- and
- a filter adaption unit which receives the input signal of the expander device as input signal and which is adapted to carry out an adaption of the de-emphasis filtering by updating a filter coefficient according to a linear prediction based on an estimated autocorrelation of each output sample.
3 more elements
A method for transmitting audio signals comprising the following steps:
- carrying out a pre-emphasis filtering of an input signal (x(n));
- adding the input signal (x(n)) and a first output signal of the pre-emphasis filtering;
- multiplying a second output signal of the addition by a first signal (g(n)), wherein the first signal (g(n)) represents a result of a level detection of a third output signal (y(n)) of the multiplication;
- and
- wherein an adaption of the pre-emphasis filtering is carried out with the third output signal as input signal by updating a filter coefficient according to a linear prediction based on an estimated autocorrelation of each output sample.
2 more elements
Dependencies are inferred from the claim text.