HT812L0 データシートの表示（PDF） - Holtek Semiconductor

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HT812L0

2.8 Second Enhanced Tone Voice

Holtek Semiconductor 

HT812L0

Functional Description

The HT812L0 is a voice and melody synthesizer

LSI with 2.8-second voice capacity at 6kHz

sampling rate and 32 sections of sound ef-

fects/simple melodies. The 2.8 seconds of voice

capacity can be divided into sections of arbi-

trary length. Notice that the silence length is

not included in the memory. As for the 32-sec-

tion tone table, various sound effects can be

generated.

The HT812L0 provides a maximum of 8 keys, 2

status indicator driving pins and a current type

D/A output. Of the 8 keys, only KEY1 can be

optioned as a sequential (random) or a direct

key. The remaining 7 keys (KEY2~KEY8) are

used as direct keys exclusively or by mask op-

tion as matrix key input (4×4).

Voice section and group

• Voice section

The total synthesized voice contents (2.8 sec-

onds) can be partitioned into the desired num-

ber of sections depending on the size of the

ROM table. The length of each section is de-

cided by the requirements of the voice con-

tents. For example:

• Melody section

The HT812L0 provides 32 melody/tone sec-

tions at maximum. Each section is composed

of 16 tone codes and each code stands for a

period of tone output. The tone frequency en-

velope shape, envelope length and speed of

tone (tempo) are all programmable. There-

fore, a variety of sound effects and melodies

can be generated.

• Group

A group can consist of one or more sections

and be made up solely of voice or melody or a

combination of both sounds. The same voice

and melody sections can appear in different

groups, as shown below:

Group 1 sec.1 + sec.2 + Melody.1 + sec.5

Group 2 sec.3 + Melody.2 + Melody.1

Group 3 sec.2 + sec1

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

:

:

:

:

Group 16 None

The maximum amount of groups included in

the HT812L0 is decided by the setting of

KEY1, as described in the following:

♦ KEY1 as a direct key

When KEY1 is selected as a direct key, the

maximum amount of groups included in the

HT812L0 is 16. And the sum of the voice and

melody sections of the 16 groups has to be

less than 256. When one of the 8 keys is

triggered, the sections of the corresponding

group is played in sequence.

♦ KEY1 as a sequential (or random) key

When KEY1 is set as a sequential (or ran-

dom) key, the maximum amount of groups

included in the HT812L0 can be defined by

the user under the condition that the total

number of the voice and melody sections of

the groups is less than 256. Of the 8 keys,

only KEY1 can be made up of more than one

group. The remaining 7 keys (KEY2~KEY8)

comprised one group only.

4

5th May ’98

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