Figure 9
From: Very Low Rate Scalable Speech Coding through Classified Embedded Matrix Quantization
Spectrograms of synthesized speech signals using the proposed coder at different rates. The utterance is "Don't ask me to carry an oily rag like that" from TIMIT, uttered by a male speaker. The vertical axis ranges from 0 to 4 kHz and the horizontal axis is from 0 to 2.5 seconds.Original SpeechSynthesized speech without parameter quantizationSynthesized speech at average bit rate of 825 bpsSynthesized speech at average bit rate of 762 bpsSynthesized speech at average bit rate of 700 bps