參數(shù)資料
型號： ACE9040
廠商： Mitel Networks Corporation
英文描述： Audio Processor Advance Information
中文描述： 音頻處理器進展信息
文件頁數(shù)： 25/33頁
文件大?。?/td> 335K
代理商： ACE9040
25
ACE9040
RECEIVE VOICE PATH
Fig. 15 Receive Voice Path
De-emphasis and Receive Signal Input
Demodulated FM signals drive the RXI input pin via an
external de-emphasis lowpass R-C filter of typically 180 k
and 10 nF. With TONEM switch set to RXI the input signal is
amplified in the block RXSENSE with a gain of + 8 dB.
RXSENSE also provides fine adjustment over a range of
- 6·0 dB to + 6·4 dB to take up signal level tolerances in the
receiver output. Fine gain adjustment is controlled by
RXSEN[4:0] bits in the “Initializing mode 0” control message.
When the DTMF generator in the transmit section is in use
its output can be switched into the receive path to replace the
RXI signal by setting bit TONEM in the “Operation mode”
control message to “1”. This does not affect the transmitted
signal but allows the user to hear DTMF tones to confirm key
press operation.
RX Bandpass Filter
The RXSENSE amplifier’s output is bandpass filtered to
the speech bandwidth of 300 to 3400 Hz by receive bandpass
filter RXBPF, as shown in figure 7. RXBPF uses switched
capacitor filter techniques but does not include an anti-alias
input filter as signals at RXI from the external receiver’s output
and the internal DTMF generator’s output are already
bandlimited. The F.M. discriminator output signals from
ACE9040’s companion device “ACE9030: Radio Interface
and Twin Synthesiser” are bandlimited by its output filter and
ACE9040’s internal DTMF tones are generated as sinewaves
without the need for a further anti-aliasing filiter.
RXBPF filter output passes through the receive mute
switch controlled by bit RXM in the “Operation mode” control
message and is buffered to drive pin RBPO by amplifier
EXPGAIN. During mute the RBPO pin is driven to the signal
ground voltage at mid supply (as found on pin BIAS).
EXPGAIN gain is nominally 12.3 dB when using the internal
expander and 0 dB when using an external expander. The
output circuit driving RBPO includes a smoothing filter to
remove clock noise.
Expander
Input to the expander at pin EIN is coupled by an external
capacitor from RBPO to remove any d.c. voltage offsets.
Using external coupling also allows the option of using an
external compander or bypassing the expander if a linear
system is required. In either case the signal should feed back
into ACE9040 at pin HFGIN. ACE9040’s compander can be
bypassed by setting bits COMP[2:1] in the “Initializing mode 0”
control message to “00”.
A ring tone from the BAR (Beep, Alarm, Ring) generator
of ACE9050 “System Controller” can be added to the
EPOP
EPON
150W
64W
3.3
μ
F
EARPIECE
DRIVER
+ 6dB
+ 6dB
EPH0/EPH1
EAMPO
LO
HFGIN
10nF
EOUT
82nF
100nF
180k
ERCIN
ERCOUT
EIN
RBPO
33nF
1dB to 2dB
12.3dB
EXPGAIN
+5dB
HIZ
LODRIVE
0dB
RXBPF
DTMF INPUT
RXSENSE
8dB
-6.4 to 6.4dB
RXM
SIDETONE
INPUT (-19dB)
TONEM
RXI
180k
10nF
NOM -12dB
-21 to 0dB
0 to-49dB
RXLEVEL
HFATTEN
HANDSFREEE
RECTIFIER
-2.8 to + 3.2
EARSENSE
TXC
HFS
RXC
68nF
HF
EAMPI
EAMP
+
_
EAMPFB
VMID
EPH0/EHP1
EXPANDER
VMIDRX
COMP[2:1]
相關(guān)PDF資料
PDF描述
ACE9050 System Controller and Data Modem(為蜂窩式手機提供控制和邏輯接口功能的系統(tǒng)控制器和數(shù)據(jù)調(diào)制解調(diào)器)
ACE9050 System Controller and Data Modem Advance Information
ACFA-450 AM CERAMIC FILTERS
ACFA-455 AM CERAMIC FILTERS
ACFA-459 AM CERAMIC FILTERS
相關(guān)代理商/技術(shù)參數(shù)
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ACE9040IGFP1R 制造商:未知廠家 制造商全稱:未知廠家 功能描述:RF/Baseband Circuit
ACE9040IGFP2N 制造商:未知廠家 制造商全稱:未知廠家 功能描述:RF/Baseband Circuit
ACE9040IGFP2R 制造商:未知廠家 制造商全稱:未知廠家 功能描述:RF/Baseband Circuit
ACE9040J/IW/FP1Q 制造商:Rochester Electronics LLC 功能描述: 制造商:Zarlink Semiconductor Inc 功能描述: 制造商:ZARLINK 功能描述:
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