HT85XXX 데이터 시트보기 (PDF) - Holtek Semiconductor

부품명

상세내역

제조사

HT85XXX

Green Voice

Holtek Semiconductor 

HT85XXX

Functional Description

The Green Voice 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 Green Voice provides 8-bit PCM, 6-bit

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

HT85XXX series, a mixed output of two chan-

nels PCM synthesis is allowed but only one

channel ADPCM synthesis is allowed. For mel-

ody generator, the Green Voice supports a tone

melody and PCM melody generator and two

channels mixed output for the whole series.

The Green Voice series build-in 8 programma-

ble 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 Green

Voice 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 Green Voice can support the following com-

pression format of the voice .WAV and .PCM

file: AD4, PCM8, m-law PCM.

Current type D/A output

The HT85XXX series supply high accuracy cur-

rent type D/A output pins for audio output. The

output volume is changeable from 0 to 15 digi-

tal levels by writing a value to the VOLUME

registers. The D/A pins are PMOS open drain

structure and ouput synthesized signals for

driving a speaker through an external NPN

transistor when the chip is active. However, it

becomes floating when the chip is in the

standby state. An 8050 type transistor with

hFE=150 is recommended for the output driver

of the D/A output pin.

Melody/Tone generator

The HT85XXX 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

5

August 24, 2000

Share Link: