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This code can be used to generate acoustic stimulus of particular pass band for conducting tonotopy presented in our paper "The representation of time windows in primate auditory cortex" [1] To map the auditory subfields, information from tonotopy fMRI data, macro-anatomical features (cortical folding), anatomical MRI can be combined. So tonotopic information from each individual animal can be used in the parcellation of function-anatomical areas of the auditory cortex. For characterising tonotopy using the BOLD response to spectral frequencies sound stimuli were based on random-phase noise carrier with different pass-bands: 0.125-0.25 kHz, 0.25-0.5 kHz, 0.5-1 kHz, 1-2 kHz, 2-4 kHz, 4-8 kHz, and 8-16 kHz resulting in stimuli that encompassed different spectral ranges. The carriers were amplitude modulated with a sinusoidal envelope of 90% depth at 10 Hz to achieve a robust response in the auditory system. Here are the MATLAB scripts for generating random phase bandpass noise stimuli with optional amplitude modulation. If you use this source code then please cite this paper: [1] Pradeep Dheerendra, Simon Baumann, Olivier Joly, Fabien Balezeau, Christopher I Petkov, Alexander Thiele, Timothy D Griffiths, "The representation of time windows in primate auditory cortex", Cerebral Cortex, 2021