(DSP, Flash Memory) is a digital speakerphone/speech/signal processing system that implements
all the functions of speech compression, record and playback, and memory management
required in a digital telephone answering machine.
The DSP system is fully controlled by a host processor DSP. The host processor provides
activation and control of all that functions as follows.
13.1. DSP (Digital Speech/Signal Processing: IC201)
- Voice Message Recording/Play back
The DSP system use a proprietary speech compression technique
to record and store voice message in FLASH MEMORY.
An error correction algorithm is used to enable playback of these
messages from the FLASH MEMORY.
- DTMF Detection/Generator
The DTMF detection is implemented by the DSP system in
software. The DTMF detection is performed during Record,
Playback, and Line Monitoring modes of operation.
When the DTMF data from the Handset is received, the DTMF
signal is output.
- Synthesized Voice (Pre-recorded message)
The DSP implements synthesized Voice, utilizing the built in
speech detector and an FLASH MEMORY, which stored the
vocabulary.
- Caller ID and Call Waiting CID demodulation
The DSP implements monitor and demodulate the FSK signals that
provide CID information from the Central Office.
- Analog Switching
The voice signal from telephone line is transmitted to the speaker
or the voice signal from speakerphone microphone is transmitted
to the Telephone line, etc. They are determined by the signal path
route operation of voice signal.
- Block Interface Circuit
RF unit, LED, Key scan, Speaker, Microphone, Telephone line, LCD
13.2. Flash Memory (IC300)
Following information data is stored.
- Voice signal
ex: Pre-recorded Greeting message, Incoming message
- Telephone number, etc.
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