公开(公告)号：US6144853A

公开(公告)日：2000-11-07

申请号：US891007

申请日：1997-07-10

申请人： Thomas A. Gentles ,  Jeffrey Paul Grundvig ,  Rajeev Krishnamoorthy ,  Pamela Kwong ,  Dale Harvey Nelson

发明人： Thomas A. Gentles ,  Jeffrey Paul Grundvig ,  Rajeev Krishnamoorthy ,  Pamela Kwong ,  Dale Harvey Nelson

IPC分类号： H04B7/005 ,  H04L25/06 ,  H04L25/49 ,  H04M1/725 ,  H04Q7/00

CPC分类号： H04L25/4925 ,  H04L25/061 ,  H04M1/72502 ,  H04W52/04

摘要： A method of transmitting a voice communications signal includes the steps of sampling the signal and creating digital representations of the samples. The digital representations are speech-coded to create speech-coded data which is converted to analog symbols. A carrier in the 46-49 MHz band is modulated by the analog symbols and transmitted. A method of receiving a voice communications signal includes the steps of receiving a modulated carrier in the 46-49 MHz band and demodulating the modulated carrier to recover analog symbols. The analog symbols are converted to digital samples, which are then converted to speech-coded data. The speech-coded data are decoded to produce digitized samples, which are converted to analog samples and filtered to produce the voice communications signal. A cordless telephone system according to the invention includes a handset and a base unit. The handset includes a microphone, a speaker, a first digital signal processor connected to the microphone and to the speaker, a first 46-49 MHz RF transceiver connected to the first digital signal processor, and a first antenna connected to the first 46-49 MHz transceiver. The base unit includes a second antenna, a second 46-49 MHz RF transceiver connected to the second antenna, a memory, and a second digital signal processor connected to the second 46-49 MHz RF transceiver, to the memory, and to a telephone line interface.

摘要翻译： 发送语音通信信号的方法包括以下步骤：采样信号并创建样本的数字表示。 数字表示是语音编码的，以产生被转换为模拟符号的语音编码数据。 46-49 MHz频段的载波由模拟符号调制并传输。 一种接收语音通信信号的方法包括以下步骤：在46-49MHz频带内接收经调制的载波并解调调制载波以恢复模拟符号。 将模拟符号转换为数字样本，然后将其转换为语音编码数据。 语音编码数据被解码以产生数字化采样，其被转换成模拟采样并被滤波以产生语音通信信号。 根据本发明的无绳电话系统包括手机和基座单元。 手机包括麦克风，扬声器，连接到麦克风和扬声器的第一数字信号处理器，连接到第一数字信号处理器的第一46-49MHz RF收发器和连接到第一个46-49的第一天线 MHz收发器。 基本单元包括第二天线，连接到第二天线的第二46-49MHz RF收发器，连接到第二46-49MHz RF收发器的存储器和第二数字信号处理器，存储器和电话 线路接口。