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參數(shù)資料
| 型號： | HT85096 |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | Green Voice |
| 中文描述： | 綠色之聲 |
| 文件頁數(shù)： | 6/11頁 |
| 文件大小： | 160K |
| 代理商： | HT85096 |
HT85XXX
6
August 24, 2000
PCM/ADPCM synthesizer
The HT85XXX 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.
The capability of the voice sampling rate for
various voice compression format.
f
OSC
PCM8
-law
PCM
AD4
4M
12kHz
11kHz
8kHz
5M
15kHz
14kHz
10kHz
6M
18kHz
16kHz
12kHz
8M
24kHz
22kHz
16kHz
Oscillator configuration
The HT85XXX series provides an RC oscillator
for the system clock. The system oscillator
stops in the standby state so as to reduce power
consumption.
For the oscillator circuit, an external resistor is
required between OSC and VSS. The oscillator
frequency is typically 4MHz for an external re-
sistor of 240k . The RC type of oscillator offers
the most cost-effective solution, although the
frequency of the oscillation may vary with tem-
perature and the chip itself due to process vari-
ation.
R
OSC
f
OSC
HT84EVA HT84P00
IC
4M
180k
240k
240k
5M
150k
210k
210k
6M
120k
180k
180k
8M
91k
150k
150k
Mask options
The following options have to be defined to en-
sure a proper system functioning:
Pull-high resistor: 33k /98k
Keydebouncetime:0ms~255ms(f
OSC
=4MHz)
(3V)
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|---|---|
| HT85XXX | Green Voice |
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| HT86030_06 | Voice Synthesizer 8-Bit MCU |
| HT86070 | Voice Synthesizer 8-Bit MCU |
| HT8656 | Talking Back |
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