FAQs - Speech ICs - General

What is the specific value of the quantized width by ADPCM?

 

What kind of method is ADPCM?

 

How should we perceive the relationship between bit rates and the synthesis length and between bit rates and sound quality?

 

How can sinusoidal waves be produced by ADPCM?

 

Can sinusoidal waves by ADPCM be used to produce an output voltage of 2.5 Vp-p?

 

What are the frequencies of sinusoidal waves?

 

Why does voice synthesis require a low-pass filter?

 

How should a cut-off frequency for a low-pass filter be determined?

 

Is there an inexpensive external filter configuration for voice synthesis?

 

Is voice quality adversely affected by deviation of master oscillation frequency?

 

What kind of recording tape should we use for recording original sound when asking for voice analysis?

 

Why does sound volume change when playback starts from part of a phrase?

 

How can normal waveforms be reproduced when playback starts from part of a phrase?

 

What is PCM?

 

What is OkiPCM?

 

What is Sampling Frequency?

 

What is ADPCM?

 

What is OkiADPCM?

 

What is OkiADPCM2?

 

What is a Low-Pass Filter (LPF)?

 

What is 4-bit ADPCM voice synthesis method??

 

What is the advantage of the 4-bit ADPCM voice synthesis method?

 

What is the advantage of the 4-, 5-, 6-, 7-, or 8-bit ADPCM2 voice synthesis method?

 

What is the advantage of the 8- or 16-bit straight PCM method?

 

What is the advantage of the 8-bit non-linear PCM voice synthesis method?

 

What is the advantage of Edit ROM?

 

What is FIFO?

 

What is DMA?

 

What is the relationship between Data Rate and the Sampling Frequency?

 

What happens if I use the 4.0MHz OSC clock instead of 4.096MHz?