Characteristics of Speech Signals MCQ

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• Low frequency signals contribute very little to the total speech signals.
  ক

  True

  খ

  False
• Spectral flatness measure is the ratio of ______ and _____
  ক

  Variance, Geometric mean

  খ

  Geometric Mean, Variance

  গ

  Arithmetic mean, geometric mean

  ঘ

  Geometric mean, arithmetic mean
• Power spectral density of speech is flat.
  ক

  True

  খ

  False
• Auto correlation function measures______ between samples of a speech signal as a function of _______
  ক

  Similarity, frequency

  খ

  Dissimilarity, time

  গ

  Similarity, time

  ঘ

  Dissimilarity, frequency
• Which of the following is not a property of pdf of speech signals?
  ক

  Non uniformity

  খ

  Very high probability of non-zero amplitudes

  গ

  Significant probability of very high amplitudes

  ঘ

  Increasing function of amplitudes between these extremes
• Speech waveforms are _______
  ক

  Bandlimited

  খ

  Bandpass

  গ

  High pass

  ঘ

  Infinite bandwidth
• Which of the following is not a property that is utilized in coder design?
  ক

  Non zero autocorrelation between successive speech signals

  খ

  Non flat nature of speech signal

  গ

  Quasiperiodicity of voiced speech signals

  ঘ

  Uniform probability distribution of speech amplitude
• Vocoders has _______ complexity and achieves _______ economy in transmission bit rate.
  ক

  Maximum, moderate

  খ

  Maximum, high

  গ

  Minimal, moderate

  ঘ

  Minimal, high
• Waveform coders has _______ complexity and achieves _______ economy in transmission bit rate.
  ক

  Maximum, moderate

  খ

  Maximum, high

  গ

  Minimal, moderate

  ঘ

  Minimal, high
• Which of the following are two types of speech coders?
  ক

  Waveform coders and source coders

  খ

  Active coders and passive coders

  গ

  Direst coders and indirect coders

  ঘ

  Time and frequency coders
• The higher the bit rate, the more speech channels can be compressed within a given bandwidth.
  ক

  True

  খ

  False