Abstract:
An improved AM-FM combined stereo receiver is provided having a single processor for removing, in the FM mode, arctangent distortion, and in the AM mode, to process the phase term from arctangent to determine Further, the radio includes a single discriminator circuit, wherein, in the FM mode, the discriminator tank circuit is used to convert frequency deviation to baseband audio, and in the AM mode, the discriminator tank circuit is used as the frequency-determining element for the voltage controlled oscillator (VCO), the VCO being used to translate the intermediate frequency (IF) signal to baseband.
Abstract:
An improved radio receiver that maintains a stable predetermined IF frequency upon receipt of input carrier signals of differing frequencies. The IF signal (14) is processed through a signal demodulation unit (16) that includes a tangent processing unit (22) to yield a control signal that varies as a tangent function of both the demodulated IF signal and a reference signal from a reference oscillator (17). This control signal is used to control the frequency and phase of a reference signal (26) used by the IF stage (12) to center the IF signal with respect to the IF stage characteristics.
Abstract:
In a stereophonic broadcasting receiver, a single indicator with two levels of illumination serves to provide indication of both accurate tuning and the presence of stereophonic signals. One signal or a combination of signals related to the tuning circuits of the receiver cause the indicator to be illuminated to a perceptible level. When, by use of a pilot tone detector, it is certain that stereophonic signals are being received, additional current is caused to flow through the indicator, raising the illumination to the maximum allowable level. The circuit has particular application to manually tuned receivers.
Abstract:
An improved AM-FM combined stereo receiver (100) is provided having a single processor (155) for removing, in the FM mode, arc-tangent distortion, and in the AM mode, to process the phase term from arc-tangent {L - R/1 + L + R} to determine {L - R/1 + L + R}. Further, the radio includes a single discriminator circuit (161, 137, 139) wherein, in the FM mode, the discriminator tank circuit (137, 139) is used to convert frequency deviation to baseband audio and, in the AM mode, the discriminator tank circuit is used as the frequency-determining element for the voltage controlled oscillator (VCO) (161), the VCO being used to translate the intermediate frequency (IF) signal to baseband.
Abstract:
In a cognitive radio, a method of establishing an operational policy for use in a Peer-to-Peer (P2P) group, wherein the policy can be described by layers of policy parameters with progressively higher layers having a progressively increasing number of parameters, involves determining that a policy change is to be made from a current policy (316); requesting policy information from at least one P2P group member (320); receiving a policy description from the at least one P2P group member (322); and implementing a change in the lowest layer policy parameter to establish a new operational policy (324).
Abstract:
A wireless receiver receives (101) a desired wireless signal and then detects (102) self-sourced intermodulation products other than with respect to the desired wireless signal to provide corresponding detected results. The wireless receiver then uses (103) these detected results to control gain as corresponds to the desired wireless signal.
Abstract:
In certain embodiments of a cognitive radio (100), a method of establishing operational policies, involves determining that a new policy decision should be made; requesting a policy decision from an authority having more computing power than the cognitive radio; receiving the policy decision from the authority; and implementing the policy decision in the cognitive radio. Other embodiments may incorporate more, fewer or other elements.
Abstract:
A method and apparatus for allowing communication units (100) to utilize non-licensed spectrum is provided herein. In particular, when a radio (100) determines a need to transmit within non-licensed spectrum, the radio (100) searches for a beacon being transmitted (303). The beacon identifies a priority of the current user of the non-licensed spectrum (305). If the radio's (100) priority is higher than the current user of the non-licensed spectrum, or if no beacon is heard, the radio (100) may begin transmitting within the non-licensed spectrum (311). As part of the radio's (100) transmission, a beacon will be broadcast by the radio (100) identifying the radio's (100) priority.