A system and method for automatically detecting and identifying a plurality of frequencies simultaneously present in an audio signal, as well as the duration, amplitude, and phase of those frequencies, then filtering out harmonic components to determine which frequencies are fundamentals. The system includes a computer readable medium of instruction code that decomposes the signal into its component sine waves by computing and comparing correlations between the input signal and sine waves at various phase and amplitude combinations. The system also employs several optimization and error correction routines.

System and method for automatically detecting a set of fundamental frequencies simultaneously present in an audio signal

An improved system for the determination of pitch or perceived frequency of signals generated by musical instruments or voices and for the display of the results in a format easily understood and used by musicians. An incoming signal from a microphone is peak detected after amplification, then further processed by rejecting spurious peaks through the use of an inhibit circuit which sends onward acceptable pulses and inhibits those pulses which arrive during a period immediately following each accepted pulse, the period being approximately 3/8 of the time between acceptable pulses. These pulses drive a period measuring circuit which provides a signal proportional to the time between input pulses, the signal being fed back to the inhibit circuit for its proper operation and being fed forward to the readout display where the results are translated into convenient musical notation, like C + 1 ♯. The display further subdivides the standard 6% musical pitch increments in 2% increments so that slightly sharp or flat indications can be provided for the use of the musician.

Pitch determination and display system

An automatic frequency meter is disclosed including a resonant frequency structure coupled to a transmission line with the frequency of the resonant structure continuously swept and change in level of the signal on the transmission line detected for a determination of the resonant frequency of the structure and therefore the frequency of the signal. The resonant frequency structure can be YIG coupled to the transmission line in an absorbtion mode. The YIG can be coupled to the line by positioning adjacent a slot in the center conductor with the slot aligned parallel to the magnetic field for coupling to the 210 mode or perpendicular to the magnetic field for coupling to the 110 mode of the YIG.

Automatic frequency meter

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Automatic frequency meter