DIGITAL SIGNAL PROCESSING DEVICE AND AUDIO DEVICE

Disclosed is a digital signal processing device including a digital filter unit for performing a filtering process on a signal inputted to the digital signal processing device on the basis of a filter coefficient set by a control device, a maximum allowable amplitude estimation unit for estimating a maximum allowable amplitude value allowable by the digital signal processing device in a system including the digital signal processing device, by using an impulse response of the digital filter unit, and a restart request unit for making a request of the control device for a restart of the digital signal processing device when the amplitude value of a signal to be outputted from the digital signal processing device is equal to or greater than the maximum allowable amplitude value or when the amplitude value exceeds the maximum allowable amplitude value.