Abstract: An apparatus and method for concealing data bursts in an analog scrambler using parts of the audio of a signal in substitution for the data bursts. What otherwise would be periodic data bursts appearing at the audio output are replaced with selected portions from audio portions of the multiplexed signal. Preferably the replaced audio samples come from immediately past and immediately future portions of the audio of the signal. The data bursts are therefore effectively concealed from the audio output which improves on the degradation of audio otherwise caused by the data bursts that are mixed in periodically with the audio portions of the signal.

Abstract: A data path evaluation system and method is described wherein the data path can be a voice signal path and the reference signal can contain white gaussian noise.

Abstract: Method and apparatus for content based HyperText Markup Language (HTML) coding. A computing device such as a server may include an HTML simplifier, encoder, and memory. Source HTML data may be accessed that presents HTML web pages. The HTML data is simplified. The simplification minimizes the size of the HTML data. Prior knowledge of the HTML data may be used during the simplification. The simplified HTML data is encoded using a Huffman code. The encoded/compressed HTML data is stored. HTML data is encoded/compressed based on an empirical study of common HTML pages, therefore, providing optimization and performance gains.

Abstract: A data path evaluation system and method is described wherein the data path can be a voice signal path and the reference signal can contain white gaussian noise.

Abstract: A system and method for detecting a signal of interest, for example a voice signal, in a composite signal, for example a composite of voice and non-voice signals, is described.

Abstract: An apparatus and method for maintaining a constant speech envelope using automatic gain control, wherein the level of the audio signal is monitored. If increasing, a first level of gain increase is applied to the gain signal. If decreasing, a second level of gain decrease is applied to the gain signal, the second level being less than the first level. By applying a lower level of change to the gain signal when it is seen as decreasing, a more constant speech envelope is obtained during gaps and interstices in the analog signal that are common in speech.

Abstract: An apparatus and method for concealing data bursts in an analog scrambler using audio repetition. What otherwise would be periodic data bursts appearing at the audio output are replaced with samples from audio portions of the multiplexed signal. Preferably the replaced audio samples come from immediately past portions of the audio of the signal. The data bursts are therefore effectively concealed from the audio output which improves on the degradation of audio otherwise caused by the data bursts that are mixed in periodically with the audio portions of the signal.

Abstract: An apparatus and method for creating voice privacy in electronic voice transmission systems includes the steps of digitizing an analog signal and inverting and rotating the frequency spectrum of the digitized audio signal. From the inverted and rotated spectrum, a complex signal is created from which the real component is extracted to produce a real signal suitable for transmitting. The processing method may optionally include the steps of translating the frequency of the signal spectrum, reducing the sampling rate, shifting the spectrum of the signal again, increasing the sample rate, and extracting the real part of the signal to produce a real signal. The digital signal processing is performed entirely with software. The scrambling and descrambling processes are identical, therefore, the same hardware and software may be used to scramble and descramble the signal.

Abstract: An apparatus and device for continuously scrambling audio while transmitting or receiving synchronization data. When transmitting, synchronization data will be substituted for scrambled audio but the audio scrambling will continue during those time periods so that once the substituted synchronization data is stopped, the scrambled audio will pick up at a point correlated to the then existing condition of a time dependent scrambling algorithm. The receiver will descramble the scrambled audio but will replay past scrambled audio to replace portions in the received signal that would be otherwise occupied by the synchronization data. In this manner, the quality of received audio is enhanced.