Abstract: Voice processing methods and circuits use bandpass filters and energy detectors to determine the energy in frequency channels of a voice signal. A bit array having a horizontal direction corresponding to the channels and a vertical direction corresponding to time provides a representation of the voice signal that can be stored during training and compared to other bit arrays during voice recognition. One comparison method compares horizontal lines of bit arrays using a position-weighted K factor. A segmentation process divides arrays into segments to better identify corresponding lines in arrays. Corresponding lines can also be selected in segments using an alternating top-down/bottom-up best match process. When this comparison finds a matching array, the match is confirmed if match result is significantly better than a match result for a bit array corresponding to different voice command and if vertical checking confirms the match.

Abstract: A voice activation system for a home or office computer allows a user at a remote location to telephone the computer. A modem or other voice hardware for the computer provides a voice signal from the user to a voice activation system that analyzes the voice signal. When the voice activation system recognizes spoken commands in the voice signal, the voice activation system activates procedures according to the spoken command. One procedure in a system that uses the analog voice signal on a telephone line for voice and data hangs up on the user, contacts a dial-up service, downloads voice or e-mail messages from the dial up service, and the calls the user back. Another procedure accesses data such as a telephone number list stored in the computer and converts the data into a voice signal sent to the user at the remote location.

Abstract: An improved solid state isolation device that uses opto-isolators to provide an electrical barrier between a telephone network and user telephone equipment includes a load and current control circuit, and an adjustable termination circuit to eliminate or reduce signal distortion and insensitivity to low signal levels resulting from low loop current, and lack of complex impedance compensation/termination for diverse telephone system parameters. An improved trans-hybrid return loss circuit reduces internal losses; while loop termination losses are reduced by the use of Shottky diodes in the line coupler circuit. A high pass filter improves common mode rejection ratios in the transmit and receive paths, and adjustable compensation is provided to account for manufacturing variances in the opto-isolators. An additional connection is also provided to adapt the opto-isolator circuit for use with 3-wire ring circuitry.