Time unit conversion

frames_to_samples	Convert frame indices to audio sample indices.
frames_to_time	Convert frame counts to time (seconds).
samples_to_frames	Convert sample indices into STFT frames.
samples_to_time	Convert sample indices to time (in seconds).
time_to_frames	Convert time stamps into STFT frames.
time_to_samples	Convert timestamps (in seconds) to sample indices.
blocks_to_frames	Convert block indices to frame indices
blocks_to_samples	Convert block indices to sample indices
blocks_to_time	Convert block indices to time (in seconds)
samples_like	Return an array of sample indices to match the time axis from a feature matrix.
times_like	Return an array of time values to match the time axis from a feature matrix.