CELP

Test Your Knowledge

CELP Quiz: Bringing Speech to Life

Instructions: Choose the best answer for each question.

1. What is the primary principle behind CELP (Code Excited Linear Prediction)?

(a) Fourier Transform (b) Linear Prediction (c) Wavelet Transform (d) Pulse Code Modulation

2. What is the main purpose of the codebook in CELP?

(a) Storing original speech samples for transmission (b) Providing a library of pre-defined excitation signals (c) Analyzing speech for frequency components (d) Compressing the codebook itself for efficient storage

3. Which of the following is NOT a benefit of CELP?

(a) High compression rates (b) High speech quality (c) Requires high bandwidth for transmission (d) Robustness to transmission errors

4. What is the process of reconstructing the speech signal at the receiver called?

(a) Encoding (b) Compression (c) Synthesis (d) Analysis

5. Which of the following applications DOES NOT utilize CELP technology?

(a) Mobile phone calls (b) Video conferencing (c) Digital audio broadcasting (d) Text-to-speech software

CELP Exercise: Speech Compression Simulation

Task:

Imagine you are designing a simple speech compression system based on CELP. You have a codebook with 4 pre-defined excitation signals (A, B, C, D), each representing a different speech pattern. You are analyzing a short speech segment and have identified the following characteristics:

• Segment 1: Quiet, low-energy sound
• Segment 2: Sudden burst of high energy, like a cough
• Segment 3: Smooth, sustained vowel sound
• Segment 4: Rapidly changing, consonant-like sound

Problem:

For each segment, select the most appropriate codebook entry (A, B, C, or D) to represent the speech. Justify your selection based on the characteristics of each segment and the role of the codebook.

Note: You can use your imagination to assign specific characteristics to each codebook entry (e.g., A = quiet, B = explosive, C = sustained, D = fluctuating).

Techniques

None