摘要:
A method of automatically tuning a high power system by measuring the gradient of component value against efficiency for each component (3,9,l0,l4) in turn and, for each component, finding two points (l7,l9) of equal and opposite gradient and setting the component (3,9,l0,l4) to a value (2l) half-way between these points (l7,l9).
摘要:
A digital color signal processing circuit comprises an automatic phase control loop circuit (13-17, 19) including a first frequency converter (13, 14) which frequency-converts a carrier frequency of an input digital color signal into a first predetermined frequency, a second frequency converter (20) for frequency-converting a carrier frequency of an output signal of the automatic phase control loop circuit into a second predetermined frequency different from the first predetermined frequency, and a control circuit (36, 37, 21) for controlling the second frequency converter based on a control signal obtained from the automatic phase control loop circuit. An output signal of the second frequency converter is outputted as an output signal of the digital color signal processing circuit.
摘要:
An integrable auto-tuned frequency discriminator is provided having a feedback circuit (13) to tune the discriminator when an input signal having a reference frequency is applied to the input of the frequency discriminator. The input signal is multiplied by a delayed version thereof which is provided by a delay filter (11). The length of delay is varied by altering the transfer function of the delay filter in response to delay filter control inputs. The discriminator output is coupled to a feedback circuit which generates the control input signals, thereby tuning the delay filter to provide a discriminator output reference level. A control input (18) to the feedback circuit provides the capability to tune the delay filter to a carrier frequency which is offset from the reference frequency. A gate input (19) to the feedback circuit disables the feedback input after the frequency discriminator has been tuned.
摘要:
According to a wireless circuit (1), in a case where a control section (50) carries out switching between use frequency bands of an antenna (10), the control section (50) sets, in accordance with a first set value which has been adjusted by an impedance variable matching section (20) before the switching, a set value of an impedance variable matching section (20) after the switching. This prevents communication, which is carried out by the wireless circuit including the variable matching section, from being cut off when the use frequency band are switched.
摘要:
A mobile radio receiver for a vehicle includes a tuner front-end section, a location data port for receiving tuner location data, a sensor port for receiving sensor signal measurement data from at least one vehicle sensor, a tuner front-end section parameter server port for sending the tuner location data, the sensor signal measurement data for receiving a set of tuner front-end section parameter data, and a data processing unit. The data processing unit is operably connected to the tuner front-end section, the location data port, the sensor port, and the tuner front-end section parameter server port. The mobile radio receiver provides an operational mode, a checking mode, a tuner parameter retrieval mode, and a tuner parameter application mode.
摘要:
Ein Komfort- und/oder Zugangskontrollsystem insbesondere für Fahrzeuge umfasst eine elektronische Steuereinrichtung, eine Benutzer- und/oder Sensoreinrichtung und der elektronischen Steuereinrichtung sowie der Benutzer- und/oder Sensoreinrichtung zugeordnete Mittel für eine Funk-Kommunikation zwischen der Steuereinrichtung und der Benutzer-und/oder Sensoreinrichtung. Der Steuereinrichtung sind Messmittel zugeordnet, durch die ein eventueller Frequenzversatz zwischen der Trägerfrequenz eines von der Benutzer- und/oder Sensoreinrichtung ausgesandten, von der Steuereinrichtung empfangenen Anforderungssignals und der Frequenz eines der Steuereinrichtung zugeordneten Oszillators gemessen wird. Die Steuereinrichtung umfasst Kompensationsmittel, durch die Frequenz des der Steuereinrichtung zugeordneten Oszillators zur Erzeugung der Trägerfrequenz eines von der Steuereinrichtung auszusendenden Bestätigungssignals in Abhängigkeit vom gemessenen Frequenzversatz variabel so einstellbar ist, dass der Frequenzversatz bezüglich der Trägerfrequenz des Bestätigungssignals und der Trägerfrequenz des Anforderungssignals kompensiert wird.