International Mobile Machines Corporation

Intel Corporation

Interdigital Technology Corporation

Duane R Bolgiano

Joel M Benjamin, Jr

Victor Meyer, Jr

Gilbert E LaVean

Sherwin I Seligsohn

Scott Seligsohn

Chumlong Deangdeelert

A plurality of antennas transmit a first spread spectrum signal having an associated code. The first spread spectrum signal is received at the wireless user. For each received first spread spectrum signal, a second spread spectrum signal is transmitted having an associated code having a same phase as that received first spread spectrum signal. The second spread spectrum signals are received at the plurality of antennas. A distance measurement is determined between each antenna and the wireless user based on in part a received timing of the second signals. The wireless user's location is determined based on in part the distance determinations.

Method and apparatus for receiving code transmissions over timeslots and antennas

Method and apparatus for locating a wireless user

In a communication system that comprises a plurality of subscriber stations in RF communication with a base station having multiple sequentially repetitive time slots, each time slot being assigned to a particular subscriber station, means to change either the frequency or the time slot configurations, or both, in the event of a deterioration of transmission quality caused by modulation change, frequency channel interference, equipment failure, or the like, or by the entrance of additional subscriber stations going on line.

Apparatus and method for obtaining frequency agility in digital

A telephone system for actuating a function-generating device such as ringing a telephone bell, lighting a lamp, reading a meter, and the like, the system being adapted to be directly operated by a pulse-generating means such as a rotary telephone dial.

Rotary dial decoder

A function generating system such as a telephone ringer, which is sound or voice-controlled in that when the signal is first applied by the caller it results in a series of digits or other sounds emitted by the receiver. The caller follows each of these sounds by either a responsive sound or silence. When the responsive sounds correspond to a programmed code, the function is activated.

Sound-activated code-controlled detection system for telephones and the

An electrical control system containing a power supply network including a primary high voltage power source and a secondary low voltage power source, the primary power source being held inactive except for periodic intervals of time, and also being removable for replacement or recharging; the secondary power source being charged during operation of the primary power source and being operative while the primary power source is inoperative.

Power supply system

A monostable system utilizable in a portable radio telephone network, comprising a phase detector coupled to a counter; the phase detector receiving incoming signals and acting to control the functioning of the counter in accordance with the polarity of the phase detector.

Monostable system

A tone detector comprising a non-linear or saturated system that is adapted to receive an input frequency or group of frequencies and to provide an output in the form of turn-on and turn-off signals which are independent of the amplitude of the input, the turn-on and turn-off signals being determined by the presence or absence of a particular frequency or group of frequencies; the system including a transistor connected to a biasing network that is DC referenced to a supply voltage potential of the collector of the transistor and AC referenced to the emitter of the transistor, and a filter connected to the transistor, the filter being substitutable by an input coupling capacitor to determine the presence or absence of the particular frequency or frequencies.

Tone detector

A portable telephone system which utilizes both a VOX and a duplexer network wherein the necessity for the transmission of a continuous signal and continuous receiver scanning is eliminated, thereby conserving power, and wherein the ringing signal is generated locally by the individual subscriber units to prevent contact with the base station until full two-way communication is established, thereby preventing possible interference with other parties already on the line.

Portable telephone system

A filter-type pulse counter system which separates pulses of desired frequencies from pulses of undesired frequencies, filters out the pulses of undesired frequencies, and then accepts and counts only those pulses of the desired frequencies.

Filter-type pulse detection means

A system for screening out undesired signals from desired signals, the system being selectively programmed to effect this screening through programmed codes, the system also having means to utilize the desired signals to effect the performance of a selected function such as the sounding of a signalling means to indicate the transmission of the desired signals, the activation or deactivation of electrically controlled devices, or the actuation of a reprogramming means, the system being especially adapted to utilization in a telephone system for screening out undesirable calls and permitting desirable calls to effect activation of the selected functions.

Code-controlled detection and function actuating system

A system for selectively deactivating a telephone bell on a telephone instrument whereby when a telephone number is called, an auxiliary system automatically cuts in to prevent ringing of the bell until a predetermined code is dialed or touch-toned, at which time the telephone bell is actuated.

Code-controlled ringer attachment for telephones including

A system for selectively deactivating a telephone bell on a telephone instrument whereby when a telephone number is called, an auxiliary system automatically cuts in to prevent ringing of the bell until a predetermined code is initiated by the calling station, at which time the telephone bell is actuated.

Growing community of inventors

Bala Cynwyd, PA, United States of America

Duane R Bolgiano