Motorola Corporation

Ronald E Sharp

Jaime Andres Borras

David L Brown

Paul D Marko

Thomas V D'Amico

Robert E Stengel

David F Willard

Francis R Yester, Jr

Kenneth D Alton

Mark S Stuglik

Emilio J Cuadra

John D Nocilini

Thomas V D'amico

A radio communication device (10) comprises a radio transceiver (12), having a received signal strength indicator (RSSI) (16), an audio section (22), and a controller (16) for deactivating the audio section whenever the RSSI indicates the the received signal strength is below a predetermined threshold. The controller also operates as a counter (26) for indicating the length of time that the received signal strength has been below the predetermined threshold.

Muting of radio-transmitter digital audio based on received signal

A transceiver (100) is provided for transmitting during the transmission bursts (12) of a frame and receiving during the receiving time-slot windows (14). The transceiver (100) includes a receiver (320) for receiving a repeating radio frequency data (16) signal at any time within the receiving time-slot window (14) and for demodulating the repeating radio frequency data signal down to a baseband data signal. A data detector and clock recovery device (330) recovers the valid data (CHMP) from the baseband data signal. For controlling the receiver (320) and data detector and clock recovery device (330), a control circuit (400) modifies the receiving time-slot windows (14) to only receive and detect when valid data is expected (52).

Burst mode receiver control

A communication system 100 for determining the optimum direction (206) for transmitting and receiving a signal in a radio comprises a receiver for receiving a carrier signal being a time divided signal having an instruction signal, a transmitter for transmitting a time divided signal, a directional antenna (10) coupled to said receiver and transmitter, and a steering device (28) for changing the phase of the carrier signal in accordance with the instruction signal.

Telecommunications system using directional antennas

A communication device 200 capable of operating in a communication system 100 having a control system which generates information signals with redundant information is disclosed. The communication device comprises: a receiver 214 for receiving the information signals; a circuit which can determine the signal quality of the received information signals 234; and a controller 226 which decodes the received information signals, and further compares the signal quality of the information signals with a predetermined value, and decides if the received signal quality is at least equal to the predetermined value in order to only decode a portion of the information signal. Upon the communication device decoding a portion of the information signal, the communication device 200 is placed in a battery saving mode in order to conserve battery life.

Method and apparatus for providing power conservation in a communication

A method for registration of a portable unit that may be utilized in a communication system that comprises a network controller, having a data base for storing portable identification numbers, a base station, and a portable unit, wherein a subscriber communicates to the network controller a first information set which comprises subscriber qualifying information, the portable identification number, and a key code that has been entered into the portable, and wherein the subscriber has entered a link identification number for over-the-air registration into a memory within the portable unit. The registration method comprises the following steps. The portable unit sends the base station a request for registration. The request for registration comprises the link identification number for over-the-air registration and the portable identification number. The base station receives the request for registration from the portable unit, and sends to the network controller a notice of the request for registration and the portable identification number. The network controller receives the notice of the request for registration from the base station, and determines whether the portable identification number is in the network controller data base, and whether the subscriber has been approved for registration. The network controller then sends to the portable unit, through the base station, a registration information signal if the network controller determines that the portable identification number for over-the-air registration is in the network controller data base, and that the subscriber has been approved for registration, the registration information signal comprising an encrypted secret subscriber identification number that has been encrypted with the key code, and an unencrypted link identification number for base station access.

Secure over-the-air registration of cordless telephones

Logic circuitry in a portable electronic device is combined with the microprocessor to reduce power consumption in the microprocessor and its associated memories during inactive periods of the device, with periodic sampling for inputs from peripherals or received data which would require active operation of the device.

Stanby mode controller utilizing microprocessor

An improved detection arrangement for detecting the presence of a given tone in a received input signal. A reference generator, in the form of a reference clock and a programmable divider, produces a first reference frequency, equal to the frequency of the tone, and at an arbitrary phase angle thereto. A second generator output is in quadrature to the first. Each reference signal is product detected with the input signal via exclusive OR gates. A unique digital low pass filter, operating in a time multiplex mode, receives the gate outputs, removes all high frequency components therefrom, and produces pairs of output binary number encoded signals, each of which is representative of a vector component of a detected tone. Threshold detector circuitry monitors the outputs indicating an above threshold condition at its output in response to predetermined combinations of the binary numbers. The combinations represent all input vectors whose resultant absolute magnitude exceeds a chosen threshold. A second detector samples the threshold detector output, recording the number of samples over threshold during a given interval. If the number exceeds a selected minimum an output signal is produced which indicates the presence of a received tone.

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Plantation, FL, United States of America

Ronald E Sharp