View source for Special inflection codes for TI Text to Speech—English

Special Inflection codes used by the TI [[Text-to-Speech]] disk program.

In general, the allophone code space is subdivided into two areas. The first one, ranging in numbers from
1 through 240, is the [[Standard allophone codes for TI Text to Speech—English|actual allophone range]]. Presently, only 126 of those 240 codes are actually used.

The second range, from 241 through 255, is used for special function codes. Each special function has up
to two additional numbers associated with it. This appendix describes the codes currently used.

==Inflection code 249==
Secondary stress-point. Depending on the state the stringer is in, the stress-point will either be given
the current vowel pitch level, and the vowel pitch will be incremented by a computed delta amount,
or, after an upgoing primary stress-point, the stress-point will be raised one level above the current
vowel pitch level, and the vowel pitch will be decremented by the computed delta amount.
==Inflection code 250==
Sentence break code. Resets parameters to default values given by SPEAK routine. This code is
followed by two parameters: the number of secondary stress-points before and after the primary
stress-point, respectively. If the primary stress-point is a rising (question mark) stress, the second
parameter indicates the number of vowels after the primary stress-point. If the first parameter has
either of the values 254 or 255, the second parameter will indicate the total number of vowels in the
phrase. A value of 254 or 255 for the first parameter indicates that the entire phrase should have a
rising or falling tendency respectively. This tendency is spread out over at least 8 vowels, and slopes
over 15% as indicated by the slope parameter in the SPEAK call.
==Inflection code 251==
New default slope parameter. The number following this code indicates the new slope parameter to
be used. As usual, the slope indicates 3 times the actual slope value, to allow for fractional values of
the slope. Normally the slope parameter should be selected to be approximately 10% of the pitch
parameter.
==Inflection code 252==
New default pitch parameter. The number following this parameter indicates the new default pitch
level to be used. Notice that this pitch level is only valid for the current phrase. Permanent pitch level
modifications have to be made using the parameters in the SPEAK routine.
==Inflection code 253==
Rising pitch contour. Used for question-type phrases at primary stress-point. Will cause the next
allophone to be gradually raised in pitch, starting below the current default level, and ending above
the current default level. If no vowels are following the primary stress-point, as indicated by the most
recent 250 code, the allophone will be put at the standard pitch level, but along a gradually rising
slope, starting at the current level (with the current stressed allophone), and rising to a higher level.

Taken from the Text to Speech disk manual.