參數(shù)資料
型號(hào)： TEA1098ATV
廠商： NXP SEMICONDUCTORS
元件分類： 無(wú)繩電話/電話
英文描述： Speech and handsfree IC
中文描述： TELEPHONE SPEECH CKT, PDSO40
封裝： PLASTIC, VSOP-40
文件頁(yè)數(shù)： 15/40頁(yè)
文件大小： 185K
代理商： TEA1098ATV
2000 Mar 21
15
Philips Semiconductors
Preliminary specification
Speech and handsfree IC
TEA1098A
handbook, full pagewidth
FCA152
LOG
9 (4)
8 (3)
7 (2)
11 (6)
12 (7)
10 (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
to logic
Fig.10 Signal and noise envelope detectors.
Fig.11 Signal and noise envelope waveforms.
handbook, full pagewidth
MBG354
INPUT SIGNAL
SIGNAL ENVELOPE
NOISE ENVELOPE
4 mV (RMS)
1 mV (RMS)
A
C
C
36 mV
36 mV
B
B
B
A
B
time
A: 85 dB/ms
B: 0.7 dB/ms
B: 0.7 dB/ms
C: 0.07 dB/ms
To determine the noise level, the signals on pins TENV
and RENV are buffered to pins TNOI and RNOI. These
buffers have a maximum source current of 1
μ
A and a
maximum sink current of 120
μ
A. Capacitors C
TNOI
and
C
RNOI
set the timing. In the basic application, see Fig.18,
the value of both capacitors is 4.7
μ
F. At room
temperature, the 1
μ
A sourced current corresponds to a
maximum rise-slope of the noise envelope of
approximately 0.07 dB/ms.
This is small enough to track background noise and not to
be influenced by speech bursts. The 120
μ
A current that is
sunk corresponds to a maximum fall-slope of
approximately 8.5 dB/ms. However, during the decrease
of the signal envelope, the noise envelope tracks the
signal envelope so it will never fall faster than
approximately 0.7 dB/ms. The behaviour of the signal
envelope and noise envelope monitors is illustrated in
Fig.11.
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TEA1098H 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Speech and handsfree IC
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