HT81009(2005) データシートの表示（PDF） - Holtek Semiconductor

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HT81009
(Rev.:2005)

EasyVoice™ Speech

Holtek Semiconductor 

HT81XXX

Functional Description

The EasyVoiceTM is voice synthesizer with 6, 9, 12, 18 or

36-second voice capacity. A group of pre-recorded voice

sections is played upon receipt of key trigger input sig-

nals. Two FLAG signals are output while playing voices.

The HT81XXX voice capacity can be divided into sec-

tions of arbitrary length. Notice that the silence length

and end-pulse width are not included in the memory.

By using Holtek¢s programming tools (HT-VDS81W),

the contents and arrangement of sections, as well as

key features and FLAG output are all programmable be-

fore device fabrication.

The IC provides 6 direct key inputs (KEY1~KEY6),

KEY1 can be optioned as a direct, sequential trigger

key. KEY2~KEY6 can be selected as a stop or a direct

key.

The IC provides matrix key (KEY1~KEY8), 6 program-

ming pins (KEY1, KEY2, KEY3, KEY4, I/O1 and I/O2)

can be divided to 8 key that can be optioned as normal

or one shot trigger.

Play Function Block Diagram

K ey

tr ig g e r

K ey

fe a tu re s

o p tio n

8 /1 6 /3 2 W

SPK

K ey

fu n c tio n

V o ic e

ta b le

ROM

ROM

PW M +

PW M -

S e le c t

TR

V DD

8W

SPK

P la y c o n tr o l lo g ic

F la g

o u tp u t

System Oscillator

The EasyVoiceTM has a built-in RC oscillator which re-

quires only one external resistor for normal applications.

The oscillator frequency is typically 2MHz for an exter-

nal resistor of 150kW. The required oscillator frequency

may vary with different sampling rates in the process of

voice programming. As a result, the value of the oscilla-

tor resistor may be different with respect to different

items.

O SCI

H T81X X X

R O SC

The oscillator is turned on when triggered by a key input.

After playing, it is immediately turned off. Then the chip

goes into the standby state.

Voice ROM

The voice ROM is originally designed to continuously re-

cord the 6, 9, 12, 18 or 36-sec voice data at about 5kHz

sampling rate. A higher sampling rate will generate

voices of better playback quality, but will shorten the to-

tal recording time. On the other hand, a lower sampling

rate will result in longer recording time but sacrifice the

voice quality.

The playback time can be significantly extended by

making use of coding efficiency, silence playing, section

repeating, section cascade, etc.

Section

Section is the basic element constituting the contents of

the 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 in-

terval of silence. However, the silent length is not

counted in the voice ROM. The total number of sections

included should be less than 240 due to the space limi-

tation of the function table ROM. The total length of the

included sections is limited by the voice ROM.

E x a m p le 1 : O n e s e c tio n o n ly

s e c .1

ROM

E x a m p le 2 : 3 s e c tio n d iv is io n

s e c .1

s e c .2

ROM

E x a m p le 3 : N s e c tio n d iv is io n

s e c .1 s e c .2

ROM

s e c .3

s e c .N

A section, when triggered by a key input, can be played

once, repeatedly or cascaded with other sections, de-

pending on the key function table instructions.

The following are examples of section division:

In addition, a section can be set as retriggerable or

non-retriggerable depending on code option.

· Retriggerable

When the currently playing section is set as

retriggerable, it will stop immediately upon receipt of

other key inputs.

· Non-retriggerable

When the currently playing section is selected as

non-retriggerable, it will go on playing until the whole

section is completed, whether or not there is a key in-

put in the process of playing.

Rev. 1.40

10

March 1, 2005

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