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Editing Speech on the SDS6000
E-8
E.8.2
Editing MELP Speech on the SDS6000
MELP Parameter Sets—MELP analysis creates one analysis file containing
three sets of parameters: uncoded, coded, and compressed, with the
compression factor defined in the MELP Setup dialog box.
-
Uncoded MELP—There is really no
uncoded MELP synthesizer. When
you edit uncoded MELP parameters, the changes are automatically trans-
ferred to the coded parameters. When you click on
Uncoded on the play
pad, you hear the simulation of MELP synthesis using the coded parame-
ters.
-
Coded MELP—When you edit coded parameters, the changes are auto-
matically passed to the compressed parameters, because the only differ-
ence is in the
send bit. When you edit compressed parameters, you are,
in effect, editing coded parameters.
-
Compressed MELP—Using the Edit menu’s Compress command on any
file (uncoded, coded, or compressed) works on the coded parameters and
computes the
send [frame] bit for every frame.
MELP Editing Parameters—MELP synthesized speech requires less editing
than LPC speech. However, some problems may still arise, especially with a
high degree of compression.
Three parameters can be edited in the text editor for coded MELP:
-
Gain—Energy or A0 value refers to the loudness of the signal
-
Pitch—F0 or T0 value refers to the frequency of a sound
-
Voicing (BPVC)—Band-pass voicing refers to the degree of voicing in a
frame. A value of 1 or 2 is close to unvoiced (0), while 3 is moderate
voicing, and 4 or 5 are voiced.
Also:
-
Send—
Send bit refers to file compression. If the file is uncompressed (that
is, its compression ratio is set to 1.000), the send bit has a value of 0. If
a file is compressed (that is, its compression ratio is set to less than 1.000,
such as 0.600), then the send bit has a value of 1. This parameter cannot
be edited.
The commands in the Modify menu can also be used: Zero Out, Linear
Interpolation, % Change, and Compress. The commands Select, Copy, Cut,
and Paste are also available for editing MELP. All of these commands work just
like they do for LPC editing.
For uncoded MELP, the text editor contains the following parameters:
-
Pitch—F0 or T0 value refers to the frequency of a sound
-
Gain—Energy or A0 value refers to the loudness of a signal
-
BPVC—
Band-pass voicing refers to the degree of voicing in a frame. A
value of 1 or 2 is close to unvoiced, while 3 is moderate voicing, and 4 or
5 are voiced.
Summary of Contents for MSP53C691
Page 1: ...MSP53C691 Speech Synthesizer December 2000 MSDS Speech User s Guide SPSU020 ...
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