I plan on learning/using an open source phoneme recognition package called cmusphinx/pocketsphinx.

https://cmusphinx.github.io/wiki/phonemerecognition/

Also there are 39 phonemes (plus a silence) so my design will increase the outputs from 32 to 39.

I have also noticed that these are always sequential so can be represented in 6 bits rather than the previous 32. For practical reasons each character should be represented as 8bit, or 2 hex characters.

Examples of the decoding taken from the cmusphinx is laid out below, with hex values added.

HEX    CMUBET   IPA   Example   Translation
--     ------   ---   -------   -----------
00     SIL      .     silence   ...word-end [ SIL ] word-start...
01     AA       ɑ     odd       AA D
02     AE       æ     at        AE T
03     AH       ʌ     hut       HH AH T
04     AO       ɔ     ought     AO T
05     AW       ɑʊ    cow       K AW
06     AY       ɑɪ    hide      HH AY D
07     B        b     be        B IY
08     CH       ʧ     cheese    CH IY Z
09     D        d     dee       D IY
0A     DH       ð     thee      DH IY
0B     EH       ɛ     Ed        EH D
0C     ER       ɜɹ    hurt      HH ER T
0D     EY       eɪ    ate       EY T
0E     F        f     fee       F IY
0F     G        ɡ     green     G R IY N
10     HH       h     he        HH IY
11     IH       i     it        IH T
12     IY       ɪː    eat       IY T
13     JH       ʤ     gee       JH IY
14     K        k     key       K IY
15     L        l     lee       L IY
16     M        m     me        M IY
17     N        n     knee      N IY
18     NG       ŋ     ping      P IH NG
19     OW       oʊ    oat       OW T
1A     OY       ɔɪ    toy       T OY
1B     P        p     pee       P IY
1C     R        ɹ     read      R IY D
1D     S        s     sea       S IY
1E     SH       ʃ     she       SH IY
1F     T        t     tea       T IY
20     TH       θ     theta     TH EY T AH
21     UH       ʊ     hood      HH UH D
22     UW       u     two       T UW
23     V        v     vee       V IY
24     W        w     we        W IY
25     Y        j     yield     Y IY L D
26     Z        z     zee       Z IY
27     ZH       ʒ     seizure   S IY ZH ER