Patent ID: 8594138
Filing Date: 2013-11-26
Classification: H04L,H04M

Abstract:
1. A method for transmitting digital data in a voice channel connection of a digital wireless telecommunication system, the method comprising: receiving digital input data; encoding the digital input data into a series of audio frequency tones; assembling the series of audio frequency tones into a data burst; applying a selected windowing function to the data burst, the windowing function comprising a tapered leading edge followed by a substantially constant amplitude data region, so as to form a windowed waveform burst having the substantially constant amplitude data region that includes the data burst; and inputting the windowed waveform burst to a transmission side vocoder for transmission over the voice channel connection of the digital wireless telecommunication system; wherein the tapered leading edge of the windowing function gradually increases in amplitude from substantially zero amplitude to substantially a predetermined peak amplitude, over a first predetermined duration in a range of approximately one-half second to three seconds, so that the leading edge of the windowed waveform burst gradually increases in amplitude from substantially zero amplitude to substantially the predetermined peak amplitude, over the first predetermined duration.