MAGIC VOICE

De-/Codierung

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De- / Codierung - De- / Coding

Parameter Look Up Tables (Coding Tables)

The speech synthesizer basically needs 10 binary bits for each coefficient. However, the requirement for storage can be reduced by encoding the set of coefficients. The synthesis parameter (Pitch, Energy, K1..K10) are stored in EPROM in the Magic Voice Module. Each parameter occupies between 3 and 10 bit. During synthesis, the coded values select a 10-Bit actual parameter from the parameter lookup ROM stored in the T6721A.

(e.g. Texas Instruments TMS 5220 uses the "654P74" coding table also known as "D6")

Tabellen:
- Energy
- Pitch Period
- Kn Parameter

- Excitation Function


Excitation ROM for voiced sounds:

8 byte ROM: rectangle or triangle wave

64 byte ROM: sin wt^2

Unvoiced sounds: random noise generator

48 Bit/Frame: non-linear transformation
96 Bit/Frame: linear transformation

Datenkomprimierung der Parameter - Data packing of the parameters

Example:

No. of Bits (Table Bit allocation)

Codes:

Binary:

In Hexa:

Bits inverted in Nibble

Nibbles are swapped

Result:


Inversion Table: (TMS 50C20)
0 1 2 3 4 5 6 7 8 9 A B C D E F
0 8 4 C 2 A 6 E 1 9 5 D 3 B 7 F

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