System and method for controlling adaptivity of signal modification using a phantom coefficient

Systems and methods for controlling adaptivity of signal modification, such as noise suppression, using a phantom coefficient are provided. The process for controlling adaptivity comprises receiving a signal. Determinations may be made of whether an adaptation coefficient satisfies an adaptation constraint and of whether the phantom coefficient satisfies the adaptation constraint. The phantom coefficient may be updated, for example, toward a current observation. The adaptation coefficient may be updated, for example, toward the phantom coefficient, based on whether the phantom coefficient satisfies an adaptation constraint of the signal. A modified signal may be generated by applying the adaptation coefficient to the signal based on whether the adaptation coefficient satisfies the adaptation constraint. Accordingly, the modified signal may be outputted.