1. For the seven waveform plots shown in Figure 1, identify and mark (on the waveform plots) the regions of each of the phonemes in each of the words associated with each waveform plot, namely:
(a) and (b) that (c) was (d) by (e) enjoy (f) company (g) simple
2. Shown in Figure 2 are spectrograms of four isolated words. Which of the following words might be the ones spoken, and which spectrograms match the words you identified: that, and, was, by, people, little, simple, between, very, enjoy, only, other,
company, those.
3. Which of the following pairs of tones is perceived as the louder tone (and by how many phons)?
(a) 20 dB IL at 1000 Hz or 20 dB IL at 500 Hz
(b) 40 dB IL at 200 Hz or 30 dB IL at 2000 Hz
(c) 50 dB IL at 100 Hz or 50 dB IL at 1000 Hz]
4. What is the perceived pitch (in mels) and what is the critical bandwidth (in Hz) for each of the following tones?
(a) 100 Hz (b) 400 Hz (c) 2000 Hz (d) 10,000 Hz
5. At a signal-to-noise ratio (SNR) of 12 dB (degradations w.r.t. place of production) and at an SNR of -6 dB (degradations w.r.t. place and manner of production), which of the following pairs of words are highly likely to be confused in listening tests and why?
(a) pick-tick (b) peek-seek (c) go-doe (d) go-no