Autocord Environmental Audio Monitor, featuring parameterized triggering and real time Frequency analyses.
Monitor audio in the environment for hours and even days on end, while only triggering on sounds of Interest to record to disk. Triggering can be specified by signal amplitude and frequency range. A real time frequency analyses graph is presented while monitoring, recording, and during playback to display the spectral characteristics of what is being heard. A sample rate of 32k is employed, providing up to 16 kHz of frequency range. The 16 bit resolution provides over 90 dB of amplitude range. A simple computer Microphone is all that is needed for monophonic recording. Audio is recorded directly to mp3 to economize disk space.
Beyond the ability to immediately play back what was recorded, almost any mp3 or wave file can be played for real time frequency analyses. Musicians and aspiring musicians will appreciate the FACT the predominant note of the Even Tempered Scale is displayed for each octave where a frequency peak is identified within the confines of plus or minus one eighth of a semitone (within about 12 cents). The actual frequency value of each identifiable peak in each octave is also displayed. Beyond this, the vertical lines that make up the graph are colour coded such that the lighter the colour, the closer the frequency is to one of the semitones of the Even Tempered Scale. The graph represents 10 octaves from C0 at 16.35 Hz through the last octave beginning at C9 (8372.0 Hz). Each octave is dived into 48 parts, so each vertical line represents an ‘eighth tone’. The loudest note and frequency of the entire 16 kHz range is displayed separately for added convenience, along with a peak amplitude meter calibrated in decibels (on the left).
