HT818D0 データシートの表示（PDF） - Holtek Semiconductor

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HT818D0

22.4-Second LOG-PCM Speech

Holtek Semiconductor 

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 be stopped 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 input to interrupt its

playing. On the other hand, if a

non-retriggerable section is playing, any key

interrupt is ignored.

Group

The HT818D0 plays according to the basis of

the key input. A group can be made up of one or

more sections. When a key is triggered, the cor-

responding group is played immediately. For

example, triggering KEY2 plays group 2, and so

on. The same section is allowed to appear in dif-

ferent groups. However, KEY1 can be made up

of multiple groups when it is optioned as a se-

quential or random key. Otherwise, each key is

composed of one group only.

Key function table

The sections included in the voice ROM are

played according to the instructions of the key

function table. The function table contains

group information and the playing order of sec-

tions in the groups. Notice that the total num-

ber of sections included in the groups should be

less than 508 the space limitation of the func-

tion table ROM.

· KEY1 as a direct key

Each key is mapped to a group in the

function table. If a key is not used, the group

mapped to that key is a piece of silence.

HT818D0

The following is an example of the function ta-

ble:

Group 1 sec.1 + sec.2 + sec.3 + sec.5

Group 2 sec.3

Group 3 sec.2 + sec.2 + sec.3 + sec.4

Group 4 sec.5 + sec.3

As illustrated in the above table, the voice

ROM is composed of 5 sections and the func-

tion table of 11 sections. If KEY1 is momen-

tarily triggered, section 1, section 2, section 3

and section 5 are played in sequence and then

stops. Triggering KEY2 plays section 3, and

so on.

· KEY1 as a sequential or random key

When KEY1 is optioned as a sequential or ran-

dom key, it can include multiple groups

(sub-groups) in the function table. However,

the remaining 11 keys (KEY2~KEY12) are used

as direct keys exclusively and comprise only

one group in the function table.

An example is shown below:

Group 1-1 sec.4 + sec.2

Group 1-2 sec.1 + sec.3

:

:

:

:

Group 1-N sec.2 + sec.3

Group 2 sec.2 + sec.3

Group 3 sec.3 + sec.5

Group 4 sec.1 + sec.5 + sec.2

As indicated in the above table, KEY1 can be

made up of sub-groups. Each time KEY1 is

triggered, the corresponding sub-groups are

played in sequence.

¨ The playing sequence of sequential KEY1 is:

Group 1-1 ® Group 1-2 ® Group 1-3 ..... ®

Group 1-N (the last group) ®Group 1-1 .....

¨ The playing sequence of random KEY1 is:

Group 1-3 ® Group 1-5 ..... ® Group 1-N ®

Group 1-3 ® Group 1-5 .....

6

March 15, 2000

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