HT814D0 datasheet(6/15 Pages) HOLTEK

6 / 15 page

HT814D0

March 15, 2000

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:

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.

OS C 1

OS C 2

H T 814D 0

R OS C

se c. 2

s e c . N

se c. 1

s e c . 2

se c. 3

se c. 1

RO M

E x am pl e 1: O n e s ec t i on o nl y

E x am pl e 2: 3 s e c t i on di v i s i on

E x am pl e 3 : N s ec t i o n d i v i s i o n

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