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| Number | Title | Issue Date |
| 6085347 | System and method for enhancing modem performance using digital signal processing techniques DSP error detection and filtering of a modem signal using a simple, robust, and low cost technique. The DSP technique utilizes a equalizer/filter to adjust the amplitude and phase delay of the transmitted data signal. The modem on the DSP chip may include... | 07/04/2000 |
| 6084952 | System and method for communicating electronic messages over a telephone network using acoustical coupling A system and method for communicating electronic messages between a remote device and a messaging server over telephone lines using acoustic coupling. Information is communicated between the remote device and the messaging server using acoustical tones co... | 07/04/2000 |
| 6052812 | Messaging communication protocol The present invention uses an acoustic modem embedded in a remote device enhanced with automatic repeat request and forward error correction routines to provide reliable transfer of electronic messages from the messaging server to the remote device. This ... | 04/18/2000 |
| 6023779 | Electronic, acoustical tone generating communications system and method A multi-function electronic messaging system for transmitting messages over a first communications link having a remote unit for generating forward error corrected signals representing various types of electronic messages, for generating acoustical tones ... | 02/08/2000 |
| 6006351 | Electronic communications system and method A system for communicating data between a computer and a unit remote from the computer is provided, comprising receiving input information from a user in the remote unit and for producing data signals corresponding to the input information, producing erro... | 12/21/1999 |
| 5995599 | Coupler for an acoustic coupled communications device A coupler is provided which may be incorporated into a handheld communications device to permit the handheld device to be acoustically coupled to a variety of telephone handsets. The device may include a spring-biased, adjustable microphone arm onto which... | 11/30/1999 |
