A system and method of coupling acoustic and electrical stimulation of noninvasive neuromodulation is a therapeutic system and method preferably designed for the diagnosis and/or treatment of neurodegenerative diseases and neurological disorders including, but not limited to, tinnitus, hyperacusis, sleep disorder, depression, anxiety, dizziness, migraine, or ear suffocation. The system includes acoustic signal devices for deep brain electrical stimulation and electrical pulse devices for shallow brain electrical stimulation. Further, the system includes a signal-coupling module that includes an algorithm for coupling acoustic signals to electrical pulses. Parameters of each the acoustic signals and the electrical pulses are adjusted in order for the acoustic signals to be coupled to the electrical pulses. These parameters can also be adjusted based on patient feedback. Furthermore, the system can synchronously output the coupled acoustic signals and the coupled electrical pulses, asynchronously output the acoustic signals, or the electrical pulses based on patient feedback.