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FAQs - Speech ICs - General

Q1. What is the specific value of the quantized width by ADPCM?
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Q2. What kind of method is ADPCM?
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Q3. How should we perceive the relationship between bit rates and the synthesis length and between bit rates and sound quality?
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Q4. How can sinusoidal waves be produced by ADPCM?
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Q5. Can sinusoidal waves by ADPCM be used to produce an output voltage of 2.5 Vp-p?
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Q6. What are the frequencies of sinusoidal waves?
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Q7. Why does voice synthesis require a low-pass filter?
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Q8. How should a cut-off frequency for a low-pass filter be determined?
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Q9. Is there an inexpensive external filter configuration for voice synthesis?
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Q10. Is voice quality adversely affected by deviation of master oscillation frequency?
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Q11. What kind of recording tape should we use for recording original sound when asking for voice analysis?
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Q12. Why does sound volume change when playback starts from part of a phrase?
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Q13. How can normal waveforms be reproduced when playback starts from part of a phrase?
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Q14. What is PCM?
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Q15. What is OkiPCM?
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Q16. What is Sampling Frequency?
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Q17. What is ADPCM?
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Q18. What is OkiADPCM?
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Q19. What is OkiADPCM2?
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Q20. What is a Low-Pass Filter (LPF)?
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Q21. What is 4-bit ADPCM voice synthesis method??
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Q22. What is the advantage of the 4-bit ADPCM voice synthesis method?
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Q23. What is the advantage of the 4-, 5-, 6-, 7-, or 8-bit ADPCM2 voice synthesis method?
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Q24. What is the advantage of the 8- or 16-bit straight PCM method?
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Q25. What is the advantage of the 8-bit non-linear PCM voice synthesis method?
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Q26. What is the advantage of Edit ROM?
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Q27. What is FIFO?
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Q28. What is DMA?
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Q29. What is the relationship between Data Rate and the Sampling Frequency?
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Q30. What happens if I use the 4.0MHz OSC clock instead of 4.096MHz?
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