公开(公告)号：WO1998008324A2

公开(公告)日：1998-02-26

申请号：PCT/US1997014480

申请日：1997-08-18

Applicant: ADVANCED MICRO DEVICES, INC.

Inventor： ADVANCED MICRO DEVICES, INC. ,  DETTMER, David, R.

IPC: H04L05/00

CPC classification number: H03G3/3026 ,  H03G3/001

Abstract: A near full duplex portable handset speakerphone comprises: a microprocessor; a hands-free receiver register connected to the microprocessor; a hands-free transmit register connected to the microprocessor; a ROM having a speakerphone operation algorithm, the ROM connected to the microprocessor; a first analog-to-digital converter connected to the hands-free receiver register; a second analog-to-digital converter connected to the hands-free transmit register; a first programmable digital attenuator connected to the microprocessor and to a speaker; and a second programmable digital attenuator connected to the microprocessor and to a microphone, wherein near full duplex communication is achieved without digital signal processing. In another feature of the invention, the hands-free registers provide a digital representation of the speech volume in each direction to the microprocessor. The microprocessor monitors the speech signal levels, calculates digital volume comparisons in order to make speech gain decisions for optimal sound, and digitally adjusts the gains in the two speech paths to the upper half of their maximum values.

Abstract translation: 近全双工便携式手持扬声器包括：微处理器; 连接到微处理器的免提接收器寄存器; 连接到微处理器的免提传输寄存器; 具有扬声器操作算法的ROM，连接到微处理器的ROM; 连接到免提接收机寄存器的第一模数转换器; 连接到免提发送寄存器的第二模数转换器; 连接到微处理器和扬声器的第一可编程数字衰减器; 以及连接到微处理器和麦克风的第二可编程数字衰减器，其中在没有数字信号处理的情况下实现近全双工通信。 在本发明的另一特征中，免提寄存器在每个方向向微处理器提供语音音量的数字表示。 微处理器监视语音信号电平，计算数字音量比较，以便为最佳声音做出语音增益决策，并将两个语音路径中的增益数字调整到其最大值的上半部分。