Pitch perception in an auditory prosthesis

A machine readable medium storing instructions that, if executed by a computer system, causes the computer system to perform a set of operations to process a sound signal having a fundamental frequency, comprising:

• processing the sound signal to produce channel signals in spaced frequency channels;
• determining an envelope signal for each of a plurality of the channel signals;
• and
• modulating the envelope signals with at least one broadband envelope signal containing modulation information related to the fundamental frequency of the sound signal such that the modulated envelope signals have synchronized phases and contain the modulation information related to the fundamental frequency of the sound signal.

A speech processing unit for processing a sound signal, comprising:

• a filter bank configured to process the sound signal to generate envelope signals in each of a plurality of spaced frequency channels;
• a broadband envelope detector configured to measure the envelope of at least one broadband signal;
• and
• a channel modulation module that uses the at least one broadband envelope signal to modulate the channel envelope signals to generate modulated envelope signals.

A speech processing unit for processing a sound signal, comprising:

• means for processing the sound signal to produce channel signals in spaced frequency channels;
• means for determining an envelope signal for each of a plurality of the channel signals;
• and
• means for modulating the envelope signals with at least one broadband envelope signal containing modulation information related to the fundamental frequency of the sound signal such that the modulated envelope signals have synchronized phases and contain the modulation information.