| 摘要 |
In a wireless transceiver in which digital data is to be transmitted over a wireless network, digital data such as from a GPS receiver is encoded by a synthetic speech synthesizer, which generates DTMF tones that are injected into the audio channel. For digital wireless phones in which audio signals are digitized via compression and expansion, the utilization of the speech synthesizer provides tones of such clarity and purity that they are unaffected during the compression and expansion process.
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