Chapter 7 Flashcards
Choose the correct descriptions of the fundamental frequency:
A) A partial
B) A harmonic
C) The first fundamental
D) An overtone
A partial, harmonic, and first fundamental
What frequency is 2 octaves above 1,455 Hz?
5,820
In white noise, all frequencies have the same amplitude
True
A narrowband spectrogram has good frequency resolution, ____ (broad or narrow) frequency bandwidth, and a ___ (short or long) time window
narrow, long
Which part of the human auditory system works like a Fourier analyzer in separating out the individual frequency components of complex waveforms?
the basilar membrane in the cochlea
Suppose you have a complex wave composed of two frequencies. If the lower frequency is 1500 Hz, and the higher frequency is one octave above the lower frequency, what is the higher frequency in Hz?
3,000Hz
Spectrograms are plots of sound in three dimensions. Match each axis to its dimension.
X-axis:
Y-axis:
Z-axis:
X-axis: time
Y-axis: frequency
Z-axis: amplitude/magnitude
There are different ways of making the vocal folds vibrate. The usual mode of phonation is called ____ vibration.
modal
How many octaves are in a typical audiogram? (125 Hz to 8000 Hz)
6
Human speech contains a broad range of frequencies. In general, the lower frequencies of the speech signal are ___ (lower or higher) in amplitude than the higher frequencies.
higher
In the cochlea, low frequency sounds are encoded at the ____ , while high frequency sounds are encoded at the ___.
apex, base
Suppose you have a complex wave composed of two frequencies. If the higher frequency is 1000 Hz, and the lower frequency is two octaves below the higher frequency, what is the lower frequency in Hz?
250Hz
The Discrete Fourier Transform (DFT) is a mathematical method for transforming a ____-domain waveform into a ____-domain spectrum .
time, frequency
If you examine the DFT of a waveform that is of long duration, you can obtain more precise information about the specific frequencies that are present in that signal; however, you have limited information about the time at which those frequencies occurred during the signal. (T or F)
true
Do the following describe a narrowband spectrogram or a wideband spectrogram?
- broad frequency bandwidth
- short time window
- good time resolution
a wideband spectrogram
Do the following describe a narrowband spectrogram or a wideband spectrogram?
- narrow frequency bandwidth
- long time window
- good frequency resolution
a narrowband spectrogram
In white noise, the lower frequencies are the ____ amplitude as higher frequencies. In pink noise, the lower frequencies of ___ amplitude than are higher frequencies
same, higher
An infinitely short stimulus in time will be infinitely narrow in frequency.
false
When we talk about voice in speech acoustics, what we mean is ___________.
the sound produced by phonation
