A Sudy on Human/Network Interface for Future Communication Terminals

9.1未来通信终端的人机界面（1）书写者验证：在所提出的方法中，在每个验证过程中使用包括普通字符的不同文本。该文本可以由验证系统自动选择，以反映特定作者的特征。该方法使得伪造的笔迹数据比以前的方法更难伪装作家自己只使用签名。该结果被应用到基于手写体字符的笔压和笔倾斜信息的特征提取方法中。所提出的方法的可靠性与模拟结果，使用日本手写数据进行检查。本研究亦提出一种具有身份验证功能的手写文字编码方法。（2）说话人确认：提出了一种基于加权特征参数的说话人确认方法。在该方法中，从语音信息中提取的特征参数在验证过程中适当加权。通过试验验证了该方法的可靠性。同时，提出了一种利用CELP参数的文本无关身份验证方法。将该方法应用于一种挑战-应答型验证方法--文本指示说话人验证方法。9.2未来通信终端的网络接口提出了一种采用PPM和CDMA技术的高速红外链路多路复用通信方法。该方法根据各信道的业务情况实现可变比特率传输。一个原型传输系统实现使用所提出的协议。

9.1 Human Interface for Future Communication Terminals(1)Writer Verification : In the proposed method, a different text including ordinary characters is used on every verification process. This text can be selected automatically by the verification system so as to reflect the specific writer's features. The proposed method makes it more difficult to disguise writer himself with forged handwriting data than the previous method using only signatures. This result is applied to a feature extraction method based on handwiritten characters with pen-pressure and pen-inclination information. The reliability of the proposed method with simulation results using Japanese handwritten data is examined. A cording method for handwritten characters with an identity verification function is also proposed in this study.(2)Speaker Verification : A method of speaker verification using weighted feature parameters is proposed. In this method, feature parameters extracted from speech information are weighted appropriately in the verification process. The reliability of the proposed method is examined with test results. Also, a text-independent identity verification method which utilizes CELP parameters is proposed. This method is applied to a challenge-response type verification named text-indicated speaker verification method.9.2 Network Interface for Future Communication TerminalsMultiplex communication method using PPM and CDMA technology for high-speed infrared link is proposed. This method realizes variable bit rate transmission according to the traffic conditions of each channel. A prototype transmission system is realized using the proposed protocols.