Abstract: A data communications system for conveying a series of input data symbols includes a transmitter subsystem and a receiver subsystem. The transmitter subsystem generates a series of composite waveforms corresponding to a series of input data symbols by selecting from a set of mutually orthogonal component waveforms, then combines contemporaneous portions of at least two of the component waveforms so as to form a composite waveform which is unique to the data symbol. The transmit subsystem uses the composite waveform to modulate a carrier signal and transmits the carrier signal over a communications channel. The receiver subsystem receives the carrier signal and recovers the composite waveform from the carrier signal. The receiver subsystem identifies the data symbol by, at least in part, decompositioning the composite waveforms into their constituent component waveforms so as to identify which composite waveforms have been transmitted.

Abstract: A CDMA synchronous acquisition circuit for receiving a CDMA signal and performing synchronous acquisition on the CDMA signal, comprises a receiving unit for receiving a signal and decoding the received signal to a reception base band signal which is spread-modulated in a CDMA mode, a correlation circuit for calculating a correlation value for the received base band signal every timing within one chip of a spread code by a correlator, and means for detecting the maximum value of the correlation value to estimate the spread code generation timing of a spread-modulated transmission base band signal within a precision of one chip of the spread code, wherein the correlator includes offset removing means for removing a DC offset component due to unbalance of the code balance of the spread code.

Abstract: A system and method for broadcasting an audio signal in a turbo-coded satellite digital audio broadcasting system is provided that utilizes the combination of a turbo coding system having code combining and code diversity techniques to lower the power required for transmittal and to transmit at a higher code rate of 1/4 by utilizing the puncturing sequence and a pilot signal assisted orthogonal CDMA; the invention includes an improved receiver system that uses modified RAKE receivers in order to mitigate the Rayleigh multipath fading, shadowing, and temporal blockage and improve performance. The invention further uses a terrestrial gap filler network having a reduced amount of gap fillers.

Abstract: Early and on-time signals are generated from a received CDMA signal for each PN code phase being searched, and the early and on-time signals are each divided into a number of subdwells sequentially in time. A correlation is then performed for each PN code phase search, on subdwells of the early and on-time signals for that PN code phase in a staggered manner in time, by alternating the correlation between the early and on-time signals during each sequential subdwell correlation. A detection statistic for the PN code phase is then generated from the correlation result. In an embodiment of the invention, two PN code phases are searched simultaneously by staggering the subdwell correlations in an alternate fashion between the early and on-time signals, so that each PN code phase uses a different set of subdwell correlations. In an alternative embodiment, a single PN code phase is searched by alternating the correlation between the early and on-time signals during each sequential subdwell correlation.

Abstract: GPS satellite signals are received, and a C/A code is synchronized by utilizing the non-coherent DLL so as to remove the unique code of the GPS satellite. There are generated 1/2-bit lagging, 1/2-bit leading and normal satellite codes. Then a correlation between the former and a down-converted intermediate frequency signals is carried out. Mixers mix the correlated three different phase signals with signals of a local oscillator. The output signals of the mixers are filtered by a band filter, and envelopes are detected from the filtered signals by an envelope detecting section. The detected envelopes are subtracted from each other. The output signals of the subtractor are filtered by a loop filter, and the filtered signals are controlled by a voltage control oscillator. The oscillated signals are inputted as clock signals into a satellite code generating section.

Abstract: An improved voice processing system is described which utilizes caller ID information, or portions thereof, in order to change processing parameters utilized by the voice processing system to process future signals received during a telephone call.

Abstract: A no-ring access telecommunications system is connected to a subscriber's telephone line at the demarcation point between the public switched telephone network and the telephone line or at the utility meter site on the subscriber's premises, or at a central office. The telecommunications system comprises a processor, and a normally open switch which is selectively closed by the processor to connect the telephone line to another line servicing subscriber telecommunications equipment connected in parallel thereto. The telecommunications system is programmable to suppress the first power ring signal of an incoming call on the telephone line from a remote host system. The ring signal is analyzed for Caller ID, distinctive ringing or other special tone. If a valid Caller ID, distinctive ring signal or other special tone is provided, the switch is closed. The Caller ID is regenerated on the line servicing the subscriber telecommunications equipment.

Abstract: A private branch exchange includes a detector that detects a transmission request to an external line by an extension terminal. An identifying circuit identifies the direct inward dialing number of the transmitting extension terminal and a transmitter transmits the direct inward dialing number of the transmitting extension terminal that is identified by the identifying circuit to the external line.

Abstract: A portable cellular telephone capable of recognizing a Calling Line Identifications (CLI) signal. The telephone comprises a memory for storing telephone numbers and a counter for storing the respective number of calls received from telephone numbers stored in the memory. Preferably the counter comprises for each number stored in the memory an associated portion (counter field) of the same memory. The telephone may be adapted to display, e.g. on LCD, the number of calls received from telephone numbers stored in the memory. Hence the user can review at a glance how many times a particular caller has made an incoming call.