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參數(shù)資料
| 型號： | 935263448518 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | SPEAKER PHONE CIRCUIT, PQFP44 |
| 封裝： | PLASTIC, SOT-307, QFP-44 |
| 文件頁數(shù)： | 6/43頁 |
| 文件大?。?/td> | 237K |
| 代理商： | 935263448518 |
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1999 Oct 14
14
Philips Semiconductors
Product specication
Speech and handsfree IC
TEA1098
DUPLEX CONTROLLER
Signal and noise envelope detectors: pins TSEN, TENV,
TNOI, RSEN, RENV and RNOI
The strength of signal level and background noise in both
channels is monitored by signal envelope detectors and
noise envelope detectors respectively. The outputs of the
envelope detectors provide inputs to the decision logic.
The signal and noise envelope detectors are shown in
Fig.10.
For the transmit channel, the signal between pin TXIN and
pin TSEN is amplified by 40 dB. For the receive channel,
the signal between pin HFRX and pin RSEN is amplified
by 0 dB.
The signals between pin TSEN and pin TENV, and
between pin RSEN and pin RENV are logarithmically
compressed and buffered.
The sensitivity of the envelope detectors is set by
resistors RTSEN and RRSEN. The capacitors connected in
series with these two resistors block any DC component
and form a first-order high-pass filter.
In the basic application, (see Fig.19), it is assumed that
VTXIN = 1 mV (RMS) and VHFRX = 100 mV (RMS) nominal
and RTSEN and RRSEN both have a value of 10 k. When
capacitors CTSEN and CRSEN both have a value of 100 nF,
the cut-off frequency is at 160 Hz.
The buffer amplifiers feeding the compressed signals to
pins TENV and RENV have a maximum source current of
120
A and a maximum sink current of 1 A. Capacitors
CTENV and CRENV set the timing of both signal envelope
detectors. In the basic application, the value of both
capacitors is 470 nF. Because of the logarithmic
compression, each 6 dB signal increase means an 18 mV
increase on the signal envelopes at pins TENV or RENV
(room temperature). Thus, timings can be expressed in
dB/ms. At room temperature, the 120
A sourced current
corresponds to a maximum signal envelope rise-slope of
85 dB/ms, which is sufficient to track normal speech
signals. The 1
A current sunk by pin TENV or pin RENV
corresponds to a maximum fall-slope of 0.7 dB/ms. This is
sufficient for a smooth envelope and also eliminates the
effect of echoes on switching behaviour.
handbook, full pagewidth
MGL344
LOG
8 (4)
7 (3)
6 (2)
10 (6)
11 (7)
9 (5)
LOG
from
microphone
amplifier
from
loudspeaker
amplifier
DUPLEX CONTROLLER
TSEN
RTSEN
CTSEN
CTENV
CTNOI
RRSEN
CRSEN
CRENV
CRNOI
TENV
TNOI
RSEN
RENV
RNOI
to logic
Fig.10 Signal and noise envelope detectors.
Pin numbers in parenthesis apply to the TEA1098H. Pin numbers not in parenthesis apply to the TEA1098TV.
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