A2 Acoustics Ab

Siv Leth

Mats Olle Gustavsson

Fredrik Samuelsson

Urban Emborg

The invention refers to a device for sound control in a space () with a sound field from at least one sound source (). The device includes a pulse sensor (), which provides a pulse signal from the sound source (). Moreover, the device includes a number of sound influencing members () for reducing the sound field in the space () and a number of sound sensors (), which sense the actual sound field in the space and provide an error signal. A control unit includes a signal supplied device (), which receives a pulse signal and supplies a first signal to an adaptive filter (). The filter has a number of filter coefficients and generates a drive signal for each sound influencing member (). The signals supply device also supplies second signals to a calculating member (), which calculates the value of the filter coefficients by the second signals and the error signals for updating the adaptive filter (). A detecting member detects phase and frequency of the pulse signal and a coefficient table provides two sets of coefficients for generating the second signals from detected phase and frequency of the pulse signal.

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Arholma, Sweden

Siv Leth