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參數(shù)資料
| 型號： | SAA7708H |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | Car Radio Digital Signal Processor |
| 中文描述： | 汽車無線電數(shù)字信號處理器 |
| 文件頁數(shù)： | 21/60頁 |
| 文件大?。?/td> | 281K |
| 代理商： | SAA7708H |
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1998 May 19
21
Philips Semiconductors
Preliminary specification
Car Radio Digital Signal Processor
SAA7708H
10.7.3
AGC
SET POINT
(1
BIT
)
In case the sensitivity and feed forward factor are out of range in a certain application, the set point of the AGC can be
shifted. The set point controls the sensitivity of the other IAC control parameters. See bit 11 of $0FFB (Table 25).
10.7.4
T
HRESHOLD SENSITIVITY OFFSET
(3
BITS
)
With this parameter the threshold sensitivity of the comparator in the interfering pulse detectors can be set. It also
influences the amount of unwanted triggering. Settings are according Table 31.
10.7.5
D
EVIATION FEED FORWARD FACTOR
(3
BITS
)
This parameter determines the reduction of the sensitivity of the detector by the absolute value of the MPX signal. This
mechanism prevents the detector from unwanted triggering at noise with modulation peaks. In Table 32 the possible
values are given.
10.7.6
S
UPPRESION STRETCH TIME
(3
BITS
)
This parameter sets the duration of the pulse suppression after the detector has stopped sending a trigger pulse. It can
be switched off by applying the value 0. The duration can be selected in steps of one period of the 304 kHz (3.3
μ
s)
sample frequency. In Table 33 the possible values are given.
10.7.7
MPX
DELAY
With this parameter the delay time between 2 and 5 samples of the 304 kHz sample frequency can be selected. The
needed value depends on the used front end of the car radio. Settings are according Table 34.
10.7.8
L
EVEL
IAC
THRESHOLD
(4
BITS
)
With this parameter the sensitivity of the comparator in the ignition interference pulse detector can be set. It also
influences the amount of unwanted triggering. The possible values are given in Table 26. The prefix value ‘0000’ switches
the Level IAC function off.
10.7.9
L
EVEL
IAC
FEED FORWARD SETTING
(2
BITS
)
This parameter allows to adjust for delay differences in the signal paths from the FM antenna to the MPX mute, namely,
via the FM level ADC and level IAC detection and via the FM demodulator and MPX conversion and filtering. These
differences depend on the front end used in the car radio. With a simultaneous appearance of a peak disturbance at the
LEVEL input and the MPX ADC input of the chip, a zero delay setting will make for the level IAC mute pulse to coincide
with the passage of the disturbance in the MPX mute circuit. The setting for the Level IAC Feed Forward allows to
advance the mute pulse by 1 sample period or to delay it by 1 or 2 sample periods of the 304 kHz clock, with respect to
the default. The appropriate I
2
C bits for each setting are given in Table 27.
10.7.10 L
EVEL
IAC
SUPPRESSION STRETCH TIME
(2
BITS
)
This parameter sets the time the mute pulse is stretched when the LEVEL input has stopped exceeding the threshold.
The duration can be selected in steps of one period of the 304 kHz (3.3
μ
s) sample frequency. In Table 28 the possible
values are given
10.7.11 D
YNAMIC
IAC
THRESHOLD LEVELS
If enabled by the lev_en_dyn_iac I
2
C bit (bit 15, register $0FFC) this block will disable temporarily all IAC action if the
MPX mono signal exceeds a threshold deviation (threshold 1) for a given time with a given excess amount (threshold 2).
This MPX mono signal is separated from the MPX signal with a low-pass filter with the - 3 dB corner point at 15 kHz. The
possible values of the this threshold can be found in Table 29.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAA7709/N107 | 制造商:PHILIPS-SEMI 功能描述: |
| SAA7709H/N103 | 功能描述:音頻 DSP DIGITAL SIGNAL PROCESSOR RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube |
| SAA7709H/N103,518 | 功能描述:音頻 DSP DIRAC-2 RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube |
| SAA7709H/N103,557 | 功能描述:音頻 DSP DIGITAL SIGNAL RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube |
| SAA7709H/N103/S420 | 功能描述:音頻 DSP Car radio Digital Signal Processor RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube |
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