HT819D0 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT819D0

4.2 Second LOG-PCM Speech

Holtek Semiconductor 

HT819D0

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 it is a non-

retriggerable section playing, any key inter-

rupt is ignored.

Group

The HT819D0 plays groups according to the key

input. A group can be made up of one or more

sections. When a key is triggered, the corre-

sponding group is played. For example, trigger-

ing KEY2 plays group 2, and so on. The same

section is allowed to appear in different groups.

However, KEY1 can be made up of multiple

groups when it is optioned as a sequential or

random key. Otherwise, each key is comprised

by 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 as well as playing order of

sections in the groups. Notice that the total

number of sections included in the groups

should be less than 252–the space limitation of

the function 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. The following

is an example of the function table:

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 5 keys (KEY2~KEY6) 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

5

6th May ’98

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