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Copyright 2005© Siemens AG
Page 30 of 53
TD_Repair_L2.5_A70_A75_R1.0.pdf Release 1.0
Speech
• A Speech Coder-Decoder: FR, EFR, AMR Narrow Band, or HR.
• Discontinuous transmission (DTX)
• Voice activity detection (VAD)
• Comfort noise generation (CNG).
Voiceband
• Generation of tones and side-tones
• Ringer tone generation
• Echo Cancellation (handsfree) with noise reduction
Also the functionality and the internal and external interfaces of the Audio Scheduler is
implemented in DSP firmware of E-GOLDlite.
Real Time Clock (integrated in the E-GOLDlite):
The real time clock (degree of accuracy 150ppm) is powered via a seperate voltage regulator
inside the PMU. Via a capacitor, data is kept in the internal RAM during a battery change for
at least 30 seconds. An alarm function is also integrated with which it is possible to switch the
phone on and off.
7.4 SRAM
Memory for volatile data
Memory Size: A70/A75 - 16 Mbit
Data Bus: 16Bit
7.5 FLASH
Memory Size: A70 - 32 Mbit (4Mbyte) A75 - 64 Mbit (8Mbyte)
Data Bus: 16 Bit
7.6 SIM
SIM cards with supply voltages of 1.8V and 3V are supported.
7.7 Vibration Motor
The vibration motor is mounted in the lower case. The electrical connection to the PCB is
realised with pressure contacts.
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