In the real-time mode, the program acquires an FFT sized block of digitized sound data directly from the sound card, computes the spectrum and displays the results. The program will continuously acquire new data, average it with previous data, and display the results until stopped. The toolbar contains controls to allow you to modify the averaging and peak hold while running.
By default, the last 60 seconds of digitized audio data is stored in a temporary buffer. Switching to the Recording or Post Processing modes will allow you to convert this buffer into a WAV file for further processing.
Single step operation:
Pressing the <Enter> key will perform a single FFT measurement and then automatically stop the analyzer. The current average is not reset during single step operations.
Depending upon the speed of your CPU, the selected sampling rate and FFT size, the computer may not be able to perform an FFT on the current data block and display the results before the next block is available. In this case, there will be gaps in the processed data. To perform gap free analysis, simply record the audio segment and analyze the data using the post-processing mode.
Often it is useful to run the analyzer in the Real Time mode while making preliminary measurements and then switching over to the Recorder mode before making the final measurements.
See also: Basic Operation , Performance Issues , Settings