Abstract: The system for transmitting and receiving electronic mail of the present invention, comprises: a text input means for entering a text of the electronic mail to be transmitted; an extracting means for extracting a character string to specify a place from the text inputted by the text input means; an adding means for adding information to the electronic mail, the information corresponding to the place specified by the extracted character string; a text display means for displaying the text in the electronic mail; and a map display means for displaying map information indicating the specified place corresponding to the information added to the electronic mail.

Abstract: An information retrieval system is provided, by which necessary information can be easily and accurately obtained from among a large number of information items by using a communication terminal which is mounted to a movable object or is fixedly disposed. In the system, a communication terminal accesses a host server and sends the server the present position of the terminal so as to retrieve desired information stored in information servers connected to a network. The host server stores summary information, categories, and positional information on the information stored in the information servers, and the communication terminal identifies an information server according to the above information stored in the host server.

Abstract: A vehicle mounted unit 1 has a WWW browser for analyzing and discriminating HTML files obtained from the Internet. The HTML files are provided with a tag for the navigation apparatus (extension tag) in addition to a normal tag. The normal tag includes a descriptive statement which is now widely used on the Internet. The extension tag includes a descriptive statement newly defined for the navigation apparatus, and controls the operation of the vehicle unit 1. The vehicle unit 1 discriminates the normal tag and the extension tag at the time of receiving the HTML file, and in the case of a normal tag, executes normal operation (screen display such as characters), and in the case of an extension tag, executes functions for the navigation apparatus.

Abstract: The present invention relates to a route guidance apparatus comprises: a mobile computer having a communication means, an input means, an output means, and a position sensor, the mobile computer being carried by a user; a host computer having a communication means and a data storage means; a user computer; and a communication network for establishing communication between the mobile computer, the host computer, and a user computer, wherein the host computer stores information corresponding to a travel route selected by a user in the data storage means, and transmits the information to the mobile computer through the communication network, the mobile computer outputting the travel route through the output means.

Abstract: An information retrieval system is provided, by which necessary information can be easily and accurately obtained from among a large number of information items by using a communication terminal which is mounted to a movable object or is fixedly disposed. In the system, a communication terminal accesses a host server and sends the server the present position of the terminal so as to retrieve desired information stored in information servers connected to a network. The host server stores summary information, categories, and positional information on the information stored in the information servers, and the communication terminal identifies an information server according to the above information stored in the host server.

Abstract: A vibration/noise active control system for automotive vehicles which generates a canceling signal for canceling vibrations and noises generated within the compartment of the vehicle, based on a reference signal related to the vibrations and noises by means of an adaptive filter. The canceling signal is converted into a canceling sound. The adaptive filter has a filter coefficient thereof changed based on the cancellation error between the canceling sound and the vibrations and noises within the compartment, detected by an error sensor, and the reference signal. A memory stores a plurality of filter coefficient values of the adaptive filter corresponding to a plurality of predetermined traveling conditions of the vehicle.

Abstract: An active vibration controller includes acceleration detectors for generating output signals on the basis of vibrations of a vehicle, speakers provided in a vehicle's cabin, microphones provided in the vehicle's cabin for receiving generated sounds from the speakers and road noises generated on the basis of running of the vehicle, and adaptive digital filters using output signals from the acceleration detectors as inputs for controlling filter factors on the basis of an RLS algorithm to minimize levels of output signals from the microphones in response to output signals from the microphones and output signals from the acceleration detectors through use of a transfer function matched to the transfer function of the vehicle's cabin in a sound field between the speakers and the microphones. The controller minimized levels of output signals from the microphones by developing an applied output signal to the speakers.

Abstract: An adaptive control circuit is responsive to a reference signal, i.e. an output from a sensor which senses vibration from a vibration source, for generating a cancelling signal having a transfer characteristic inverse to a transfer characteristic of vibration from the vibration source to a human body. A loud speaker is responsive to an output from the adaptive control circuit for generating cancelling vibration. A microphone senses an error between the vibration from the vibration source and the cancelling vibration from the loud speaker and generates an error signal indicative of the sensed error. The adaptive control circuit varies the inverse transfer characteristic by an amount corresponding to the error signal so as to minimize the above error. A divided processing circuit divides the output from the sensor into vibration components falling respectively within a plurality of frequency ranges and separately processes the divided vibration components.