Abstract: Disclosed is a radio reception apparatus that can prevent deterioration of reception quality, even when a delayed wave having a delay exceeding the length of a guard interval is present in the SFN environment. In this apparatus, OFDM receiver (100) receives a radio signal via a network using a single frequency. Antenna directivity control section (122) forms directivity that is used when receiving a signal. OFDM reception section (120) measures a reception level and reception quality. Transmission station information database (140) stores positional information of a transmission station by associating the information with the transmission station.

Abstract: To provide a cell phone equipped with a broadcast receiver that delivers a high receiving sensitivity and antenna performance in various usage states. A loop element 12 as an antenna for receiving television broadcast is arranged in a range (c) of an upper end portion of an upper housing 1. An end part of an upper circuit board 6 is matched with a portion shown by (a) so that a conductor other than the antenna element does not exist in the range (c). A monopole element 19 for cell phone communication is arranged at a lower end portion of a lower housing 2.

Abstract: To provide a cell phone equipped with a broadcast receiver that delivers a high receiving sensitivity and antenna performance in various usage states. A loop element 12 as an antenna for receiving television broadcast is arranged in a range (c) of an upper end portion of an upper housing 1. An end part of an upper circuit board is matched with a portion shown by (a) so that a conductor other than the antenna element does not exist in the range (c). A monopole element 19 for cell phone communication is arranged at a lower end portion of a lower housing 2.

Abstract: The AGC threshold of electric intensity level is set by the signal processor portion 107 in response to the measured result of the error rate measuring circuit 109 that measures the error rate of the received signal, and the gain control operation of the gain control circuit 106 is caused to start when the electric field intensity detected by the field intensity detector 105 reaches the threshold of electric intensity level. Accordingly, the optimum AGC threshold of electric intensity level can be set to meet the radio wave situation in which the radio receiver, i.e., the receiving situation of the received signal and also the gain control of the gain controlling means can be achieved to optimize the signal quality of the received signal in the situation of either the IM characteristic or the electric field variation characteristic, e.g., under the environment of the strong electric field IM or the environment in which the electric field is changed strongly.

Abstract: A subject of the present invention is to provide a receiver and a communication terminal that are adapted appropriately for a plurality of communication systems.

Abstract: An FSK receiving apparatus has, as means for performing offset correction upon a demodulated base band signal, a second low pass filter 9 for integrating the demodulated base band signal; a window comparator for detecting a DC offset component in an output voltage from the second low pass filter 9; an up/down counter 11 for incrementing or decrementing a count value on the basis of the output of the window comparator 10; a clock generating portion 13 for generating a timing signal for counting operation in the up/down counter 11; a reference voltage generating portion 12 for generating a reference voltage for a comparator 7 on the basis of the output of the up/down counter 11; and a charging circuit 22 for supplying a reference voltage in the last frame to the second low pass filter 9 so as to charge the second low pass filter 9 with the last-frame reference voltage and set an initial value of the second low pass filter 9.

Abstract: A demodulating circuit 1 contains an electric field level detector 2 for detecting an electric field strength from a received modulation signal, comparators 3a to 3n for outputting electric field strength information PS, a detector 5 for outputting a detection signal corresponding to a modulation signal, both a low-pass filter 6 and a digital filter 12 for removing a noise component from the detection signal, and a data comparator 7 for comparing the detection signal with a reference voltage to output a digital signal. This demodulating circuit 1 further includes a control circuit 4 for controlling a cutoff frequency used in a digital filter 12, an output voltage amplitude of the detector 5, and the reference voltage of the data comparator 7 in accordance with both the electric field strength information PS and control condition information PC saved in an EEPROM 11 and supplied from a CPU 10, and also a judging circuit 9 for judging the digital signal at preselected timing to produce a demodulation signal.

Abstract: The result of detection performed by a receiving electric-field level detection circuit 8 and the result of detection performed by an automatic gain setting circuit 9 are fed back to a timing signal generation circuit 10 which controls a pre-heat time of a selective calling/receiving device. As a result, the pre-heat time can be changed according to the state of propagation of radio waves, and hence the life of battery of the calling/receiving device can be increased.

Abstract: An automatic tuning apparatus for a receiver has a tuning unit, a ROM and a voltage converting unit. At the time of adjustment of the tuning unit, tuning voltages are supplied to the tuning unit from a CPU and stored in the ROM as reference tuning voltages at which tunings of the tuning unit become optimum at both ends of a receiving frequency band of the receiver. In a normal use, the reference tuning voltages stored in the ROM are supplied to the voltage converting unit through the CPU. The voltage converting unit converts the reference tuning voltages into a tuning voltage of a desired receiving channel according to a predetermined format, and supplies it to the tuning unit, thereby optimizing a tuning by the tuning unit.