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 

That KEY1 functions as a random key is a

special case of sequential key, which com-

bines a particular arrangement of sub-group

playing sequence.

¨ Reset of KEY1 playing sequence

If a sub-group of KEY1 group is being played

and one of KEY2~KEY12 is triggered, the

playing sub-group will be terminated, and

the newly triggered key group is played in-

stead. The first sub-group will start playing

when KEY1 is retriggered. In other words,

the KEY1 playing sequence is reset when-

ever a key other than KEY1 is triggered (see

Figure 1).

¨ Sub-group selection

When KEY1 is triggered with pulses, a de-

sired sub-group can be selected by controlling

its corresponding pulse number. However,

the features of KEY1 have to be set in the fol-

lowing ways:

- sequential or random

- retriggerable

- minimum key debounce time

(@700ms, fOSC=96kHz)

HT818D0

For instance, if sub-group 1-3 is the previous

playing group, sub-group 1-5 will start playing

after 2 pulses are applied to KEY1, and so on.

To make easy selection of KEY1 sub-groups,

one of KEY2~KEY12 should be programmed

as silence. Then this silence key has to be

triggered to reset KEY1. By so doing, the

playing sub-group of KEY1 is directly speci-

fied by the pulse number applied to KEY1

(see Figure 2).

· KEY12 as a stop key (by mask option)

When KEY12 functions as a stop key, any

voice output can be stopped by pressing

KEY12.

· KEY1~KEY11 as a repeat key

KEY1~KEY11 all function as repeat key if

one of the eleven keys is set as a repeat key.

In other words, once the mode of one of

KEY1~KEY11 is determined, the remaining

10 keys are set accordingly.

As a repeat key, the sections included can be

played sequentially or repeatedly till other

key input is triggered. KEY12 has no other

choice but functions as a stop key when

KEY1~KEY11 are set as repeat keys.

KEY1

K E Y 2~K E Y 12

AUD

G ro u p 1 -1

G ro u p 1 -2

G ro u p 1 -N G ro u p (2 ~ 1 2 ) G ro u p 1 -1

Figure1 Reset of KEY1 playing sequence

KEY1

K E Y 2~K E Y 12

( S ile n c e )

AUD

N p u ls e

M p u ls e

G ro u p 1 -N

G ro u p 1 -M

Figure 2 KEY1 sub-group selection

7

March 15, 2000

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