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參數(shù)資料
| 型號： | HT818D0(20SOP) |
| 英文描述： | Speech Synthesizer |
| 中文描述： | 語音合成器 |
| 文件頁數(shù)： | 5/14頁 |
| 文件大小： | 202K |
| 代理商： | HT818D0(20SOP) |
HT818D0
5
March 15, 2000
Functional Description
The HT818D0 is a mask ROM type voice synthe-
sizer with 22.4-second voice capacity. A group of
pre-recorded voice sections is played upon receipt
of key trigger input signals. Two FLAG signals
are output while playing voices.
The 22.4-second voice capacity can be divided
into sections of arbitrary length. Notice that the
silence length and end-pulse width are not in-
cluded in the memory.
By using Holtek s programming tools, the con-
tents and arrangement of sections, as well as
key features and FLAG output are all program-
mable before device fabrication.
The IC provides 12 key inputs (KEY1~KEY12).
Of the 12 keys, KEY1 can be optioned as a di-
rect, sequential or random trigger key. KEY12
can be selected as a stop or direct key. The re-
maining10keys(KEY2~KEY11)areusedasdi-
rect keys exclusively.
Play function block diagram
System oscillator
The HT818D0 has a built-in RC oscillator
which requires only one external resistor for
normal applications. The oscillator frequency
is typically 96kHz for an external resistor of
530k . The required oscillator frequency may
vary with different sampling rates in the pro-
cess of voice programming. As a result, the
value of the oscillator resistor may be differ-
ent for different items.
The oscillator is turned on when triggered by a
keyinput.Afterplaying,itisimmediatelyturned
off and the chip goes into the standby state.
Voice ROM
The voice ROM is originally designed to continu-
ously record the 22.4-second voice data at a 6kHz
sampling rate. Ahigher sampling rate can gener-
ate voices of better playback quality, but will
shorten the total recording time. On the other
hand, a lower sampling rate results in longer re-
cording time but sacrifice voice quality.
The playback time can be significantly extended
by making use of coding efficiency, silence play-
ing, section repeating, section cascade, etc.
Section
Section is the basic element constituting the
contents of voice ROM. During programming,
the customer s voice sources can be divided into
as many sections as required. A section can be
composed of a voice or an interval of silence.
However, the silence length is not counted in
the voice ROM. The total number of sections in-
cluded should be less than 508 due to the space
limitation of the function table ROM. The total
length of the included sections is limited by the
voice ROM.
Asection, when triggered by a key input, can be
played once, repeatedly or cascaded with other
sections, depending on the key function table
instructions.
The following are examples of section division:
%
! 4 4
%
5 ( ! #
/ !
%
5
!
! ( )
, -
, -
6
7 ) ( %4 & ! ) & ) 4
) ( 4
! / !
,
# 8
# 8
# 8
# 8
# 8
# 8
# 8
, -
, -
, -
9 ( * / ) & : & & # ! ) %
9 ( * / ) & : & & # ! 0 ;#
9 ( * / ) & : & & # ! 0 ;#
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相關PDF資料 |
PDF描述 |
|---|---|
| HT818D0(24DIP) | Speech Synthesizer |
| HT818D0(24SOP) | Speech Synthesizer |
| HT818D0 | 22.4-Second LOG-PCM Speech |
| HT819D0(16DIP) | Speech Synthesizer |
| HT819D0(16SOP) | Speech Synthesizer |
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| HT81-99648 | 制造商:BITECH 制造商全稱:Bi technologies 功能描述:HDSL, HDSL2 Coupling Transformers |
| HT81-99649 | 制造商:BITECH 制造商全稱:Bi technologies 功能描述:HDSL, HDSL2 Coupling Transformers |
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