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TIME (SECONDS)

H I G H. AL T I T UDE. J E T S. W H IZ. P A ST. S CREAM I N G. ORIGINAL. 3. 2. 1. 0. SIGNIFICANT SILENT INTERVALS. FREQUENCY (KHz). VOICE-SWITCHED. 3. 2. 1. 0. 4. 4. 0. 0.5. 1.0. 1.5. 2.0. TIME (SECONDS). INTERVAL MODIFICATIONS X 0.5. 4. 3. 2. 1. 0.

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TIME (SECONDS)

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  1. H I G H AL T I T UDE J E T S W H IZ P A ST S CREAM I N G ORIGINAL 3 2 1 0 SIGNIFICANT SILENT INTERVALS FREQUENCY (KHz) VOICE-SWITCHED 3 2 1 0 4 4 0 0.5 1.0 1.5 2.0 TIME (SECONDS)

  2. INTERVAL MODIFICATIONS X 0.5 4 3 2 1 0 0 X 1.0 4 3 2 1 0 0 FREQUENCY (KHz) X 1.5 4 3 2 1 0 0 X 2.0 4 3 2 1 0 0 2.0 0 0.5 1.0 1.5 TIME (SECONDS)

  3. 40 KBPS 3 2 1 0 FREQUENCY (KHz) 30 KBPS 3 2 1 0 4 4 0 0.5 1.0 1.5 2.0 TIME (SECONDS)

  4. 20 KBPS 3 2 1 0 VARIABLE QUALITY20 to 40 KBPS FREQUENCY (KHz) 3 2 1 0 0 0.5 1.0 1.5 2.0 4 4 TIME (SECONDS)

  5. Audio Recording – Silence Editor • (Telephone Bandwidth) • * Coding Comparisons • – Original • – 64K PCM • – 32K ADPCM • – 24K ADPCM • * Silence Modification (32K) • – 100% • – 50% • – 25% • – 0% • – 200% • – 400% • * Paragraph Passage (0%)

  6. Audio Recording - Variable Coding Quality in Packet Transmission of Speech • Original analog input • 40 K bits/sec • 30 K bits/sec • 20 K bits/sec • Variable coding rates • 40-30-20-30-40 K bits/sec

  7. Audio Recording – Phase Vocoder • (Analyzed/Synthesized--One Half Telephone Bandwidth) • * Analyzed/Synthesized Sentences Spoken Twice • – Man • – Man • – Woman • * Synthesized Speeded (Man) • – 1:1 • – 1:1.5 • – 1:2 • – 1:3 • * Synthesized Slowed (Woman) • – 1:1 • – 2:1 • * Self-Multiplexing Bandwidth Manipulation (Time Scale Intact) • – Synthesized to Original Bandwidth • – Synthesized to One-Half Bandwidth • – One-Half Bandwidth Re-Analyzed and Restored

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