A Sudy on Human/Network Interface for Future Communication Terminals

9.1未来通信终端的人机界面(1)写入者验证：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。该文本可由验证系统自动选择，以反映特定作者的特征。与仅使用签名的方法相比，该方法使得利用伪造的笔迹数据来伪装作者自己变得更加困难。将这一结果应用于一种基于笔压和笔斜信息的手写字符特征提取方法。用日文手写数据进行了仿真，验证了该方法的可靠性。本文还提出了一种具有身份验证功能的手写体字符编码方法。(2)说话人验证：提出了一种基于加权特征参数的说话人验证方法。在该方法中，从语音信息中提取的特征参数在验证过程中被适当地加权。用试验结果验证了该方法的可靠性。提出了一种利用CELP参数的与文本无关的身份验证方法。将该方法应用于一种挑战-响应型的说话人验证方法--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基于PPM和CDMA技术的高速红外链路多路通信方法。该方法实现了根据各信道的业务情况进行可变比特率传输。利用所提出的协议实现了一个原型传输系统。

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.