Patent ID: 7881485

Claim:
An apparatus for determining an impulse response in an environment in which a speaker and a microphone are placed, using an audio signal, comprising: a processor for spectrally coloring a test signal using a psychoacoustic masking threshold of the audio signal; an introducer for introducing the colored test signal into the audio signal to obtain a measuring signal, which may be fed to the speaker; and a calculator for calculating the impulse response using a reaction signal received via the microphone from the environment and the test signal or the colored test signal, wherein the calculator is formed to perform a cross-correlation of the reaction signal received via the microphone from the environment and the test signal or the colored test signal, wherein the environment comprises several speakers and several microphones, wherein for a channel from a speaker to a microphone an impulse response is defined, wherein the apparatus further comprises: a controller for controlling the introducer such that it introduces a colored test signal into audio signals for several speakers in order to generate a measuring signal of its own for each speaker, wherein the controller is further formed to base each measuring signal on a test signal of its own, wherein test signals are mutually orthogonal for various measuring signals; and wherein for each microphone a calculator of its own for cross-correlation is provided, which is used for cross-correlating the orthogonal test signals, and an identifier for identifying an obtained impulse response using the microphone with which the calculator for cross-correlating is associated by which the obtained impulse response is calculated, and using the speaker with which the corresponding test signal is associated, which is employed for obtaining the impulse response.