參數(shù)資料
型號(hào)： TEA1098
廠商： NXP Semiconductors N.V.
英文描述： Speech and handsfree IC
中文描述： 免提語(yǔ)音和集成電路
文件頁(yè)數(shù)： 15/40頁(yè)
文件大小： 199K
代理商： TEA1098
1999 Oct 14
15
Philips Semiconductors
Product specification
Speech and handsfree IC
TEA1098
To determine the noise level, the signals between
pin TENV and pin TNOI, and between pin RENV and
pin RNOI are buffered. The 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 of both noise
envelope detectors. In the basic application, see Fig.19,
the value of both capacitors is 4.7
μ
F.
At room temperature, the 1
μ
A sourced current
corresponds to a maximum noise envelope rise-slope of
approximately 0.07 dB/ms which is small enough to track
background noise without being affected by speech
bursts.
The 120
μ
A sink current corresponds to a maximum
fall-slope of approximately 8.5 dB/ms. However, because
the noise envelope tracks the fall of the signal envelope, it
will never fall faster than approximately 0.7 dB/ms.
The behaviour of the signal envelope and noise envelope
detectors is illustrated in Fig.11.
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
Fig.11 Signal and noise envelope waveforms.
Decision logic: pins IDTand SWT
The TEA1098 selects its mode of operation (Tx, Rx or Idle)
by comparing the signal and noise envelopes of both
channels. This is executed by the decision logic.
The resulting voltage on pin SWT is the input to the voice
switch.
To facilitate the distinction between signal and noise, the
signal is considered as speech when its envelope is more
than 4.3 dB above the noise envelope. At room
temperature, this is equal to a voltage difference of
V
ENV
V
NOI
= 13 mV. This so called speech/noise
threshold is implemented in both channels.
The signal on pin TXIN contains both speech and the
acoustically coupled signal from the loudspeaker.
In Rx mode, the loudspeaker signal overrides the speech.
Therefore, the signal envelope on pin TENV consists
mainly of the loudspeaker signal. To correct this, an
attenuator is connected between pin TENV and the
TENV/RENV comparator. Its attenuation is equal to that
applied to the microphone amplifier.
相關(guān)PDF資料
PDF描述
TEA1099 Speech and handsfree IC with auxiliary inputs/outputs and analog multiplexer
TEA1099H Speech and handsfree IC with auxiliary inputs/outputs and analog multiplexer
TEA1103TS TERM BLOCK 7.5MM VERT 3POS PCB
TEA1103 Fast charge ICs for NiCd and NiMH batteries
TEA1103T Fast charge ICs for NiCd and NiMH batteries
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TEA1098A 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Speech and handsfree IC
TEA1098AH 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Speech and handsfree IC
TEA1098ATV 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Speech and handsfree IC
TEA1098H 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Speech and handsfree IC
TEA1098TV 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Speech and handsfree IC
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*