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參數資料
| 型號： | HT8658 |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | Voice Recorder (DRAM) |
| 中文描述： | 錄音機體（DRAM） |
| 文件頁數： | 6/15頁 |
| 文件大?。?/td> | 862K |
| 代理商： | HT8658 |
Recording capacity
The HT8658/HT8659 offer 4 kinds of voice sam-
pling rate, namely 32K , 22K , 16K and 11Kbps
(based on a system frequency of 384K Hz), se-
lectable by the connection of the AS0 and AS1
pins. The voice sampling rate decides the re-
cording capacity of the ICs in addition to the
type and amount of DRAM. A higher sampling
rate results in sounds of better quality but
shortens the recording time.
Sampling
R ate
DR AM Size
(Maximum)
1Mb
×
3
1Mb
×
3
1Mb
×
3
1Mb
×
3
R ecording
Time
32K bps
94 seconds
22K bps
136 seconds
16K bps
188 seconds
11K bps
272 seconds
Recording Time
Memory selection
The HT8658/HT8659 provide a DRAM inter-
face circuit. The type as well as amount of
DRAM decides the recording length of the ICs
at a designated sampling rate. There are 2
kinds of DRAM, namely 256K b and 1Mb, select-
able by the connection of the AS5 pin. The ICs
can interface with a maximum of 4 DRAMs for
the 256K b type but 3 DRAMs for the 1Mb type.
The amount of DRAMs is decided by the connec-
tion of the AS2 and AS3 pins.
AS5
1
1
1
1
0
0
0
0
AS3
1
1
0
0
1
1
0
0
AS2
1
0
1
0
1
0
1
0
Memory Size
256K b
×
1
256K b
×
2
256K b
×
3
256K b
×
4
1Mb
×
1
1Mb
×
2
1Mb
×
3
1Mb
×
3
Notes: 1. “0” connects an external pull-low
resistor to ASn, where n=2,3, or 5.
2. “1” connects no external pull-low
resistors to ASn, where n=2, 3 or 5.
Record function
The HT8658/HT8659 enter the recording state
from the standby state when the memories are
not full and the REC key is triggered as well. In
the recording state, sounds input from an exter-
nal microphone are coded by an internal ADM
(adaptive delta modulation) algorithm and
saved in an external memory until the memo-
ries are all full or the RE C key is retriggered.
During recording, recording will pause and the
recording counter stop counting by retriggering
the RE C key. At this time, if the memories are
not full and the REC key is triggered again, the
ICs will record sounds from the pause position.
Once the memories are full, recording will be
terminated and any retrigger to the REC key be
ignored.
After recording is stopped, the HT8658/HT8659
will play back the recorded sounds automat-
ically in the AUTO PLAY mode. They, on the
other hand, will play back the recorded sounds
by manually triggering the PLAY key in the
normal mode.
Play function
The HT8658/HT8659 provide 2 kinds of playing
modes, namely normal mode and AUTO PLAY
mode. In the normal mode, the ICs will play
back the recorded sounds when recording is
terminated and the PLAY key is triggered. In
the AUTO PLAY mode, they will play back the
recorded sounds automatically without manu-
ally triggering the PLAY key once recording is
terminated. In the process of playing sounds,
triggering the PLAY key will pause the playing
back in addition to the playing counter. To re-
sume playing back, simply retrigger the PLAY
key. Playing back will start at the pause posi-
tion.
HT8658/HT8659
6
26th Sep ’96
相關PDF資料 |
PDF描述 |
|---|---|
| HT86768 | Voice Synthesizer 8-Bit MCU |
| HT86072 | Voice Synthesizer 8-Bit MCU |
| HT86144 | Voice Synthesizer 8-Bit MCU |
| HT86192 | Voice Synthesizer 8-Bit MCU |
| HT86384 | Voice Synthesizer 8-Bit MCU |
相關代理商/技術參數 |
參數描述 |
|---|---|
| HT8658A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Solid-State Recorder |
| HT8658B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Solid-State Recorder |
| HT8659 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Voice Recorder (DRAM) |
| HT8659A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Solid-State Recorder |
| HT8659B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Solid-State Recorder |
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