參數(shù)資料
型號(hào)： ACE9040
廠商： Mitel Networks Corporation
英文描述： Audio Processor Advance Information
中文描述： 音頻處理器進(jìn)展信息
文件頁數(shù)： 23/33頁
文件大?。?/td> 335K
代理商： ACE9040
23
ACE9040
filter, the output buffer includes a clock rejection filter. The cut-
off frequencies are programmed by bits DATAF[1:0] in the
“Initializing mode 1” control message. Filtered data passes
through the mute switch DATM and a variable gain stage
DATADEV with a range of – 2·8 to + 3·2 dB to set the required
level of deviation. The mute switch is controlled by bit DATM
in the “Operation mode” control message. DATADEV is
controlled by bits DATD[3:0] in the “Initialising Mode 1” control
message. The data signal is buffered out to pin DATO to drive
the modulation combiner.
DTMF
DTMF tones are generated when commanded via the
serial interface and conform to the standard CCITT
frequencies. All 16 standard tone pairs or any individual tone
can be generated. To select DTMF tones data bits for
transmission DTMFEN, DTMFMODE[1:0] and DTMF[3:0]
need to be set using an “Operation mode” control message.
Data bits DTMFMODE[1:0] select low, high or both tones of
the pair as shown in table 6. Bits DTMF[3:0] select the tone
pair as shown in table 7. DTMFEN set to “1” enables DTMF
operation. To change DTMF tones, an “Operation mode”
control message with DTMFEN set to “0” must be sent to
cancel the previous selection as the DTMF tone can only be
changed when DTMFEN=0. This prevents any spurious
tones being generated.
An optional pre-emphasis of 2 dB of the high frequency
tone group above the level of the low frequency group is
enabled by bit DTWIST in the “Initializing mode 0” control
message.
DTMF tones can be selected to replace the speech in
either or both the transmit and receive paths. In the transmit
path setting bit DTMFM to “1” as in the “Operation mode”
control message will connect the DTMF signal to INPSENSE
gain adjustment block’s input in place of the speech signal. In
the receive path setting bit TONEM to “1” in the “Operation
mode” control message will connect the DTMF signal to the
input to RXSENSE gain adjustment block in place of the
speech input at pin RXI. In each case the DTMFEN bit must
also be “1”.
DTMF signals are generated as sinewaves by an internal
digital to analog converter and are smoothed by the transmit
and receive filters. DTMF waveforms start and stop at a zero
crossing to avoid transients in the filters and to limit their
bandwidth. The DTMF signal is brought out directly on pin
DTMF without further buffering.
The DTMF generator is powered down whenever a tone
is not being generated, by setting DTMFMODE[1:0] to “00”.
Re-transmitted SAT
ACE9040 provides two alternative paths for Supervisory
Audio Tones (SAT). The first of these re-transmits the
received SAT tone to the base station after narrow band
filtering and providing signal level adjustment. This path is
selected by setting SATS bit to “0” in the “Initializing mode 1”
control message. The baseband signal from the receiver FM
discriminator drives the ACE9040 through the RSI pin into the
RXSAT 6 kHz bandpass filter required for AMPS or TACS.
The recovered SAT signal then passes through a 10 dB
amplifier and the SATS selector switch to the deviation setting
amplifier SATDEV. This is controlled by bits SATD[4:0] in the
“Initializing mode 0” control message. SAT then passes
through the SATM mute switch, controlled by bit SATM in the
“Operation mode” control message, to output pin TSO for
input to the modulation combiner.
Regenerated SAT
The alternative SAT path externally measures the SAT
frequency and generates a local tone to match. This route is
TRANSMIT & RECEIVE SAT PATHS
Fig. 13 Transmit and Receive SAT Paths.
RSI
TSI
VMID
SATDEV
RSO
TSO
SCHMITT
RXSAT
6kHz FILTER
TXSAT
6kHz FILTER
-12dB
-15dB
10dB
SATM
SATS
-4.5 to +4.8dB
SATD[4:0]
相關(guān)PDF資料
PDF描述
ACE9050 System Controller and Data Modem(為蜂窩式手機(jī)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
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ACFA-459 AM CERAMIC FILTERS
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