HT84192 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT84192

Magic Voice™

Holtek Semiconductor 

HT84XXX

Functional Description

The Magic VoiceTM series is a series of program-

mable speech synthesizers and melody genera-

tors. It provides various sampling rates and

beats, tone levels, tempos for speech synthe-

sizer and melody generator. For voice synthe-

sizer, the Magic VoiceTM provides 8-bit PCM,

6-bit m-law PCM and 4-bit ADPCM synthesis.

In HT84XXX series, a mixed output of two

channels PCM synthesis is allowed but only

one channel ADPCM synthesis is allowed. For

melody generator, the Magic VoiceTM supports

a tone melody and PCM melody generator and

two channels mixed output for the whole series.

The Magic VoiceTM series build-in 8 program-

mable I/O pins and 4 programmable input pins

along with powerful user¢s command. The

user¢s instructions are employed to develop

new and customized functions for a wide vari-

ety of innovative applications.

Speech and melody analysis

The speech and melody sources of the Magic

VoiceTM can be recorded and edited from the PC

sound card and media tools. Holtek¢s CAD tools

first load a speech source file as .WAV or .PCM

format, then transfer the speech file as PCM,

LOG-PCM or ADPCM format, and finally save

it to the internal mask ROM by changing a

layer of the mask. The PCM format generates a

higher sound quality whereas the ADPCM for-

mat brings about a longer recording capacity.

The melody source can either be in the .MID or

in the .MLD format.

The .MID file is the standard format of the win-

dows media tools. The .MLD file is a text for-

mat. After the .MID file is compiled, the .MLD

file is automatically generated.

The Magic VoiceTM can support the following

compression format of the voice .WAV and

.PCM file: AD4, PCM8, m-law PCM.

Current type D/A output

The HT84XXX series supply two high accuracy

current type D/A output pins for audio output.

The output volume is changeable from 0 to 15

digital levels by writing a value to the VOL-

UME_n (n=1 or 2) registers. The D/A pins are

PMOS open drain structure and ouput synthe-

sized signals for driving a speaker through an

external NPN transistor when the chip is ac-

tive. However, it becomes floating when the

chip is in the standby state. An 8050 type tran-

sistor with hFE=150 is recommended for the

output driver of the D/A output pin.

Melody/Tone generator

The HT84XXX family has a built-in mel-

ody/tone generator. The generator can generate

13 different kinds of melody beats, 5 octaves of

tone level, 18 tempos, and 2 channels mixed

output. Of these components, the melody tempo

is changeable and generates sound effects by

writing a control value to the TEMPO register.

The chip provides the following 18 tempos, 13

beats, and 5 octaves for user¢s programming.

· 18 tempos (Beats/Min.)

68 78 82 93 100 105

109 114 119 125 132 139

147 156 179 192 227 310

· 13 beats

1 1 1 1 1 1 1 2 3 1, 4 3 2

24, 12, 8, 6, 4, 3, 2, 3, 4, 3, 2,

· 5 octaves

C1~B1, C2~B2, C3~B3, C4~B4, C5~B5

PCM/ADPCM synthesizer

The HT84XXX family contains a PCM and

ADPCM synthesizer. The synthesizer offers a

wide range of sampling rates from 4kHz to

24kHz for PCM synthesis and 4kHz to 16kHz

for ADPCM synthesis. The sampling rate of the

synthesizer can be changed by writing a control

value to the sampling rate register. It also sup-

ports a small variety of 100Hz. For a higher

performance sound quality, the PCM coding is

required. But for a longer recording capacity,

the ADPCM coding is recommended.

11

April 26, 2000

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