| 摘要 |
PURPOSE: A multiple message multilevel analog signal recording and playback system with a memory array configurable for an analog and digital storage and serial communication are provided to allow a processor to exchange information with the device. CONSTITUTION: The system includes an antenna(110), a radio frequency (RF) circuit(120), a baseband circuit(130), a processor(140), a recording and playback device(150), a mobile telephone handset(160), and an automobile kit(180). The antenna(110) receives and transmits RF signals. The RF circuit(120) performs RF signal processing such as down conversion, filtering, and power amplification. The baseband circuit(130) performs signal processing functions at the baseband frequency. The baseband circuit(130) includes a baseband coder/decoder (BB CODEC)(132), a digital signal processor (DSP)(134), and a voiceband coder/decoder (VB CODEC)(136). The BB CODEC(132) interfaces with the RF circuit(120). The DSP(134) performs digital signal processing functions on the baseband signals from the BB CODEC(132) and VB CODEC(136). The VB CODEC(136) interfaces with the recording and playback device(150) for receiving and transmitting voice band signals. Analog-to-digital and digital-to-analog conversions are performed at appropriate places in the baseband circuit(130).
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