5 schematically shows a noise unit in accordance with the present invention. Merely reducing the noise level is not a practical solution as at low noise levels the adaptation speed of the adaptive filter coefficients is relatively low, which may give rise to undesirable transients in the sound signal and even howling if the acoustic path changes during the adaptation process. In the device of Fig. Accordingly, the noise signal is at least at some frequencies larger than the residual signal, thus allowing a fast adaptation of the adaptive filter. CN, Ref document number: This feedback corrupts the speech signal and causes instability. Adaptive feedback cancellation is a common method of cancelling audio feedback in a variety of electro-acoustic systems such as digital hearing aids.The time varying acoustic feedback leakage paths can only be eliminated with adaptive feedback cancellation. Although this injected noise approach may be effective, it has the drawback that to provide a reasonable speed of adaptation of the filter coefficients, the noise level has to be relatively high. Wiele przetłumaczonych zdań z "acoustic feedback suppression" – słownik polsko-angielski i wyszukiwarka milionów polskich tłumaczeń. 1 for the sake of clarity. The filter is used to produce a compensation signal that is subtracted from the microphone signal. Acoustic feedback suppression . To this end, acoustic feedback compensation circuits typically include an adjustment unit for adjusting the coefficients of the adaptive filter. In Prior Art arrangements, the noise level is lower than the residual signal level to achieve a good masking of the noise and thereby to prevent the noise from being audible. It is noted that in the present invention, not only the amplitude but also the shape of the frequency spectrum of the noise signal may be controlled by the residual signal. 15. Typical decorrelators involve frequency shifting. Using the intuitive controls, it's simple to dial up a dynamic and feedback-free live … 3. Myth 1: Feedback suppression filters destroy your tone. The device according to claim 1 or 2, wherein the noise unit (8) is arranged for providing a noise signal having a smaller amplitude than the residual signal at frequencies where the residual signal has a relatively large amplitude and having a larger amplitude than the residual signal at least at some frequencies where the residual signal has a relatively small amplitude. An example of this approach, for the specific purpose of compensating acoustic feedback in a hearing aid, is disclosed in European Patent Application EP 0 415 677. spectrum of the noise signal. 200580004573.0, Country of ref document: Acoustic Feedback Suppression. 12. The method according to any of claims 14 to 18, wherein the noise signal has a random phase. The Prior Art device 1 ' schematically shown in Fig. Feedback Suppression Stompboxes BODYREZ ACOUSTIC PICKUP ENHANCER ##Ultra-compact acoustic guitar pickup enhancement pedal offers studio-quality acoustic tone and built-in feedback suppression ##Specifically designed to restore your guitar’s natural acoustic resonance when using under-saddle pickups 1 comprises a signal combination unit 3, an adaptive filter 4, an adjustment unit 5 and a decorrelator 6. To this end, the noise signal is multiplied by a value that depends on the residual signal level. Frequency shifting decorrelators are therefore not universally applicable. Although other circuit components such as amplifiers could be present, as a result of which x(n) would not be equal to r(n), the signals x(n) and r(n) would still be strongly correlated and the input signal z(n) would be substantially cancelled by the adaptive filter. In other words, the noise unit is arranged for producing noise having a smaller amplitude than the residual signal when the residual signal is at a peak, and a larger amplitude than the residual signal when the residual signal is at a trough. United States Patent Application 20070172080 . Unique, built-in Digital Acoustic Feedback Suppression balances sound pressure levels and system gain to enable higher volumes without any ‘howling’ effects. The device according to claim 4, wherein the noise unit (8) is arranged for adapting the frequency spectrum of the noise signal at intervals of less than 100 ms, preferable less than 30 ms, more preferably about 15 ms. 6. A system for sound amplification, comprising at least one microphone (2), at least one loudspeaker (9) and a device (1) according to any of claims 1 - 12. Application filed by Koninklijke Philips Electronics N.V. LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS, Deaf-aid sets, i.e. Some of the proposed solutions involve a filter that models and imitates the sound transmission characteristics of the air path between the loudspeaker and the microphone. The present invention relates to acoustic feedback suppression. The device according to any of the preceding claims, wherein the noise unit (8) comprises a random phase unit (84) for producing a random phase. A decorrelation process is used to improve the convergence characteristics of the broad band adaptive filter. The device according to claim 1, wherein the noise unit (8) is arranged for providing a noise signal in accordance with an auditory masking model. Adaptive feedback suppression of unknown periodic components of acoustic noises with time-varying characteristics Saeid Jafari, Petros Ioannou, and Lael Rudd Journal of Vibration and Control 2015 23 : 4 , … A1, Designated state(s): Although this frequency shift approach is very effective, it cannot be used in all applications as the frequency shift may be audible and may not be appreciated by the users of the sound amplification system. • Four RCA outputs at the rear of the CCSD‑CURD ensure that it is optimized for use in courtrooms, i.e. When two or more radio users from the same team are close to one another, and one of those users transmits, their voice is heard on the neighboring radios. Three methods of feedback suppression are explored: time-varying delay, adaptive inverse filtering, and adaptive feedback cancellation. The acoustic feedback problem manifests in many situations where there is a sensor (such as a microphone) and the feedback loop linking the sensor to the sound source, Figure 1. 5. Abstract: Acoustic feedback occurs in hearing aids due to the coupling between the hearing aid loudspeaker and microphone (s). electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception, Prevention of acoustic reaction, i.e. Several pro–active acoustic feedback (Larsen–effect) cancellation schemes have been presented for speech applications with short acoustic feedback paths as encountered in hearing aids, but these schemes fail with the long impulse responses inherent to public ad-dress systems. A high relative noise level then results in a higher adaptation speed. From MOTOTRBO. The adjustment unit 5 adjusts the coefficients of the adaptive filter 4 on the basis of the residual signal r(n) and the output signal x(n). It has also been proposed to inject a noise signal that is not correlated to the input signal and to use the residual signal and the injected noise signal to adjust the filter coefficients. IN. In this embodiment, the noise signal is based upon the residual signal, but is decorrelated due to the random phase and is amplitude adjusted to provide a suitable masking. Reduce the number of open microphones – turn off microphones that are … 2006552728, Country of ref document: KR, Ref document number: Belonging to the class of gain reduction methods, notch-filter based howling suppression (NHS) represents a traditional solution, well-known for its robustness. We derive a new prediction error method (PEM) Purpose of the application is to demonstrate Acoustic Feedback Cancellation on smartphone devices. The decorrelator 6 decorrelates the residual signal r(n) and produces the output signal x(n) which is amplified by the (optional) amplifier 11. By ensuring that the noise level is smaller than the residual signal level at those frequencies where the residual signal level is relatively high, a sufficient masking of the noise signal is achieved. Such an auditory masking model, which serves to maximize the noise level while minimizing the perception of the noise, may be known per se. By providing a noise signal having a frequency spectrum controlled by the residual signal it is possible to achieve a better trade-off between the perceived noise level and the filter adaptation speed. In particular, a higher filter adaptation speed can be obtained compared to arrangements in which a noise signal having an unchanging frequency spectrum is used. 4 schematically shows noise masking in accordance with the present invention. CCS 1000 D acoustic feedback limit Normal acoustic feedback Unity gain System gain Sound pressure level For many years to come, every meeting will be fluent, decisive, Limite feedback acustico di CCS 1000 D Feedback acustico standard Guadagno dell'unità Guadagno del sistema Livello di pressione sonora 16. 13. The present invention also provides a system for sound amplification, comprising at least one microphone, at least one loudspeaker and a device as defined above. The adjustment unit may, however, introduce errors when the output signal and the residual signal are inherently correlated, for example when the output signal is obtained by amplifying the residual signal. The device 1 of the present invention shown merely by way of non-limiting example in Fig. Accordingly, the present invention provides a device for acoustic feedback compensation, the device comprising: - an adaptive filter for providing an acoustic feedback compensation signal,
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