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參數(shù)資料
| 型號： | AK2307LV |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | Codec |
| 英文描述： | SPEECH CODEC for Digital Key telephone (5.0V/3.3V) |
| 中文描述： | 語音編解碼器的數(shù)字按鍵電話（5.0V/3.3V） |
| 文件頁數(shù)： | 22/39頁 |
| 文件大?。?/td> | 468K |
| 代理商： | AK2307LV |
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ASAHI KASEI [AK2307/LV]
4. Tone generator
AK2307/LV has two tone generators to generate the service tone, DTMF tone and melody tone. Each generator can
select the 42 tone frequencies individually, and they are added each other before output from RX receiver amp or TX
A/D path.
After the adding stage there is a gain stage to attenuate the tone level from 0dB to –45dB by 3dB step. For the DTMF
low
frequency tone, there is another attenuator to attenuate by –2.5dB which can be set from the register.
The signal format is 64 stepwise pseudo sine wave. When the tone frequency is changed, the frequency is changed at
the 0 cross point of the tone to prevent the switching noise.
4-1. Tone frequency select
The 43 tone frequencies for the generator-H and the generator-L can be selected individually from
the different registers, ”Tone generator H-frequency select” and “Tone generator L-frequency select”.
There is two kind of parameters to select the tone frequency. One is to select the fundamental frequency and
another is to select the dividing ratio of the fundamental frequency to get the final tone frequency. For example,
when 1600Hz is selected as a fundamental frequency and the number 1/4 is selec ted as a dividing factor, then
the final tone frequency shall be 400Hz.
Tone generator H-frequency select
Register Type : Read Write[Address=0101: D5-D0:(DIVH_1-DIVH_0, TH_3-TH_0)]
ADD
D7
D6
D5
D4
D3
5
-
-
DIVH_1 DIVH_0
TH_3
default
0
0
0
0
0
Tone generator L-frequency select
Register Type : Read Write[Address=0110 D6-D0: (LT_ATT, DIVL_1-DIVL_0, TL_3-TL_0)]
ADD
D7
D6
D5
D4
D3
6
-
LT_ATT
DIVL_1
DIVL_0
TL_3
default
0
0
0
0
0
TH_[3-0] / TL_[3-0]; The select bits of the fundamental frequency for the tone generator -H and the tone generator-L,
respectively.
Fundamental frequencies
MS0190-E-05
2005/12
22
D2
TH_2
0
D1
TH_1
0
D0
TH_0
0
D2
TL_2
0
D1
TL_1
0
D0
TL_0
0
Tx_3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Tx
；
TH or TL
Tx_2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Tx_1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Tx_0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Fundamental frequency( Hz )
mute
1600.00
1471.26
1391.30
1333.33
1207.55
1174.31
1049.18
1000.00
941.18
888.89
853.33
785.28
771.08
727.27
571.43
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