公开(公告)号：EP1965501A2

公开(公告)日：2008-09-03

申请号：EP08101567.9

申请日：2008-02-13

Applicant: M/A-COM, INC.

Inventor： Taylor, Richard

IPC: H04B1/04

CPC classification number: H04B1/04

Abstract: A self-contained apparatus (10) for converting an audio signal from a microphone (16) into a baseband transmit signal suitable for transmitting with an analog FM transmitter. The self contained apparatus can also decode baseband receive signals from a direct speaker audio output (31) of an analog FM receiver. The apparatus for translating an audio signal from a microphone (16) into a baseband transmit signal includes an analog to digital converter (102) for digitizing a received analog signal from a microphone (16) and a pre-modulation processor (108) for processing the digitized signal, wherein a sideband spectrum of the digitized signal is shifted away from subaudible frequencies by a predetermined amount to generate the baseband signal.

Abstract translation: 从麦克风（16）转换到发射机的音频信号为适合于与模拟FM发射的基带发射信号的自包含装置（10）。 因此，该自含式装置能够解码的基带从模拟FM接收器的直接扬声器音频输出（31）接收信号。 从麦克风（16）为基带发送信号转换到音频信号的设备包括在模拟 - 数字转换器（102），用于从一个麦克风（16）和用于处理的预调制处理器（108）数字化接收的模拟信号 数字化的信号，worin数字化信号的边带频谱从亚音频频率预定量移开以产生基带信号。

公开(公告)号：EP1973264A2

公开(公告)日：2008-09-24

申请号：EP08102660.1

申请日：2008-03-17

Applicant: M/A-COM, INC.

Inventor： Taylor, Richard ,  Janky, William

IPC: H04L7/04 ,  H04B7/26

CPC classification number: H04L7/04 ,  H04L7/0025 ,  H04L7/042

Abstract: A method and system is provided for improving bit error rate (BER) performance in delay spread fading conditions, such as the fading associated with simulcast systems. BER is improved through novel symbol synchronization that comprises oversampling an input signal (602A, 602B) and filtering the samples to determine a composite symbol sample point that converges toward the center (510, 514, 516) of the signal's effective eye pattern. The composite symbol sample point may be an average of previous composite symbol sample points and an instantaneous sample point (614) determined based on samples from a synchronization field (748, 796) of the signal. The updated composite symbol sample point may be utilized for future sampling of the incoming signal.

Abstract translation: 提供了一种方法和系统，用于在诸如与联播系统相关联的衰落的延迟扩展衰落条件中改善误码率（BER）性能。 通过新颖的符号同步来改进BER，其包括对输入信号（602A，602B）进行过采样并对采样进行滤波以确定朝向信号有效眼图的中心（510,514,516）收敛的复合符号采样点。 复合符号采样点可以是先前复合符号采样点的平均值和基于来自信号的同步字段（748,796）的样本确定的瞬时采样点（614）。 更新的复合符号采样点可以用于将来采样输入信号。