Patent ID: 8302159
Filing Date: 2012-10-30
Classification: G01R,G06F,H04R

Abstract:
1. A digital hearing aid comprising: an input/output (I/O) connection for receiving input commands from an external device and providing output information to the external device; a non-volatile (NV) memory for storing audio-enhancing algorithm instructions and one or more parameter values for use by the audio-enhancing algorithm; and a digital signal processor (DSP) coupled between the I/O connection and the NV memory, the DSP for processing a signal according to the audio-enhancing algorithm and the one or more parameter values stored in the NV memory, the DSP further configured to prevent unauthorized access to the audio-enhancing algorithm instructions stored in the NV memory through the I/O connection by controlling access to the NV memory in each of a plurality of modes of operation of the DSP, the DSP comprising: a processing core for executing instructions; and a memory for storing DSP instructions for execution by the processing core, the DSP instructions when executed by the processing core configuring the DSP to operate in one of the plurality of modes to prevent unauthorized access to the audio-enhancing algorithm instructions, the modes comprising: