-27-
Figure 11. Uplink Path
The VUL path includes two input stages. The first stage is a microphone amplifier, compatible with
electret microphones containing a FET buffer with open drain output. The microphone amplifier has a
gain of typically 25.6 dB (
±
1 dB) and provides an external voltage of 2.0 V or 2.5 V to bias the
microphone (MICBIAS). The auxiliary audio input can be used as an alternative source for higher level
speech signals. This stage performs single-ended-to differential conversion and provides a
programmable gain of 4.6 dB or 28.2 dB. The third stage is a headset microphone amplifier,
compatible with electret microphones. The headset microphone amplifier has a gain of typically 18 dB
and provides an external voltage of 2.0 V or 2.5 V to bias the headset microphone (HSMICBIAS).
When one of the input stages (MICI, AUXI, HSMICP) is in use, the two other input stages are disabled
and powered down. The resulting fully differential signal is fed to the analog-to-digital converter (ADC).
The ADC conversion slope depends on the value of the internal voltage reference. Analog-to-digital
conversion is performed by a third-order
Σ
-
Δ
modulator with a sampling rate of 1 MHz. Output of the
ADC is fed to a speech digital filter, which performs the decimation down to 8 kHz and band-limits the
signal with both low-pass and high-pass transfer functions. Programmable gain can be set digitally
from -12 dB to +12 dB in 1-dB steps and is programmed with bits 4-0 (VULPG(4:0)) of the voiceband
uplink register. The speech samples are then transmitted to the DSP via the VSP at a rate of 8 kHz.
There are 15 meaningful output bits. Programmable functions of the VUL path, power-up, input
selection, and gain are controlled by the BSP or the USP via the serial interfaces.
The VUL path can be powered down by bit 0 (VULON) of the power down register.
3.8.3. Audio uplink processing
Содержание L1100
Страница 1: ...Service Manual Model L1100 Service Manual L1100 P N MMBD0032801 Date June 2004 Issue 1 0 ...
Страница 31: ... 30 Figure 14 Power Supply Scheme ...
Страница 46: ... 45 Figure 25 CLC344E Camera Chip Circuit ...
Страница 49: ... 48 Figure 28 Camera Module Circuit MAIN BOARD FPCB ...
Страница 62: ...4 9 Microphone Trouble 61 Circuit Diagram ...
Страница 82: ... 81 U602 FPCB CN2 1 3 U601 5 4 Test Points 1 20 2 19 ...
Страница 88: ...Checking ANT SW Mobile SW 2 Rx pass continued 87 SW801 ANT Pin 2 VC2 SW801 RF Pin 7 VC1 Pin5 VC3 U801 FL801 ...
Страница 97: ...Checking ANT SW Mobile SW 2 Tx pass continued 96 Pin 2 VC2 SW801 RF Pin 7 VC1 Pin5 VC3 U801 FL801 SW801 ANT ...
Страница 98: ...5 1 Disassembly 5 ASSEMBLY INSTRUCTION 97 2 1 1 2 ...
Страница 99: ...98 1 2 3 2 1 ...
Страница 100: ... 99 1 2 3 ...
Страница 101: ... 100 ...
Страница 103: ...6 2 Download Procedure 1 Execute Fluid_GUI exe and select Erase Program flash menu 104 ...
Страница 104: ...2 Click the Add button Then choose m0 file which is going to download 105 ...
Страница 106: ...4 Press Global Settings menu Choose a correct serial port and set the configuration as below 107 ...
Страница 108: ...6 Wait for downloading to be finished 109 ...
Страница 125: ... 127 9 PCB LAYOUT ...
Страница 126: ... 128 9 PCB LAYOUT ...
Страница 129: ... 131 12 EXPLODED VIEW REPLACEMENT PART LIST 12 1 EXPLODED VIEW ...