HT814D0 データシートの表示（PDF） - Holtek Semiconductor

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HT814D0

8.4-Second LOG-PCM Speech

Holtek Semiconductor 

HT814D0

O SC1

H T814D 0

R O SC

O SC2

The oscillator is turned on when triggered by a

key input. After playing, it is turned off and the

chip goes into the standby state.

Voice ROM

The voice ROM is originally designed to continu-

ously record the 8.4-second voice data at a 6kHz

sampling rate. A higher sampling rate will gener-

ate voices of better playback quality, but will

shorten the total recording time. On the other

hand, a lower sampling rate will result in longer

recording 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.

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.

A section, 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:

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

s e c .3

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

s e c .N

ROM

In addition, a section can be set as retriggerable

or non-retriggerable depending on the code op-

tion.

· 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 till

the whole section is completed, whether or not

there is a key input in the process of playing.

For a key group, some sections can be set as

retriggerable and some as non-retriggerable.

When a retriggerable section of a key group is

playing, any key can be triggered to interrupt

its playing. On the other hand, if a

non-retriggerable section is playing, any key in-

terrupt is invalid.

6

March 15, 2000

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