chp 9 updated Flashcards
What is the name for a device that is designed to produce a real-time plot of voltage as a function of time? Note that sound waves, impinging upon a microphone, generate time-varying voltages that can be visualized with this type of device thus imagine the “waveform” from an audio source.
oscilloscope
The lowest frequency present in a waveform composed of multiple combined frequencies is call the
fundamental frequency
A [BLANK] of a sine wave is a sine wave that has a frequency which is a whole number multiple of the frequency of the original wave.
harmonic
If a note played by an instrument has a fundamental frequency of 466.164 [Hz] (B above middle C), which of the following would be closest to the second harmonic?
932 (hz)
The process of breaking down a waveform into its component sine (and / or cosine) waves is called
fourier analysis
The process of assembling a waveform by adding together component sine and cosine waves is called
fourier synthesis
Which of the following does the author of our book, Dr. Forinash, use to refer to the fact that there is a trade off in what you know about when a sound occurs and what you know about the frequencies that are present in the sound?
Uncertainty Principle
When an object, such as a string stretched between two points (e.g., a guitar strong) vibrates more or less as a standing wave, each harmonic is also called a
normal mode
The French mathematician and physicist, Jean-Baptiste Joseph Fourier, demonstrated that all complex periodic waveforms can be constructed from combinations of sine waves. It is these additional frequencies, and their affect on the detailed shape of the overall waveform, that are the main property that give a musical tone its
timbre
The more generic term for frequencies produced by an instrument or voice that are higher than the fundamental (whether integer multiples or not) is
overtone
A graphical representation of sound that shows the frequencies present as a function of time is called a
spectrogram
