Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Atsuhiko Hashigaya

Yutaka Saito

Toru Suzuki

Hiroyuki Sasaki

Haruhiko Kakitsu

Masashi Koshi

Kenya Nagano

Hidenori Matsumoto

Yukari Yamazaki

Nozomi Koh

Yoshinori Miyajima

Hidenori Suzuki

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 elementas an antenna for receiving television broadcast is arranged in a range (c) of an upper end portion of an upper housing. An end part of an upper circuit boardis 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 elementfor cell phone communication is arranged at a lower end portion of a lower housing

Portable telephone with broadcast receiver

The AGC threshold of electric intensity level is set by the signal processor portionin response to the measured result of the error rate measuring circuitthat measures the error rate of the received signal, and the gain control operation of the gain control circuitis caused to start when the electric field intensity detected by the field intensity detectorreaches 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.

Radio receiver, radio receiving method, and recording medium

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

Base band signal offset correcting circuit for FSK receiving apparatus and method thereof

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

Demodulating circuit of wireless receiving apparatus and demodulating method

The result of detection performed by a receiving electric-field level detection circuit,and the result of detection performed by an automatic gain setting circuit,are fed back to a timing signal generation circuit,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.

Selective calling/receiving device

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.

Growing community of inventors

Kanagawa, Japan

Atsuhiko Hashigaya