Renesas Electronics Corporation

Tomoaki Hirota

Hiroyuki Okada

Naohiro Matsui

Kichung Kim

Takahiro Sato

Osamu Inagawa

A rate determination apparatusincludes a reception unitconfigured to receive a transmission frame modulated by an FSK modulation scheme, a symbol rate detection unitconfigured to detect a symbol rate based on a period of a preamble portion in the received transmission frame, a multilevel symbol detection unitconfigured to detect a multilevel-modulated multilevel symbol based on a frequency deviation in the received transmission frame, and a bit rate determination unitconfigured to determine a bit rate based on the detected symbol rate and the detected multilevel symbol. Then, the bit rate can be determined during communication.

Rate determination apparatus, rate determination method, and reception apparatus

A radio frequency signal can be received in an intermediate frequency mode suitable for radio wave reception conditions. An oscillator has a variable oscillation frequency. A quadrature demodulator includes a frequency mixer and generates an intermediate frequency signal having an intermediate frequency lower than the frequency of the radio frequency signal. An ADC receives the intermediate frequency signal passed through an analog filter and converts the received intermediate frequency signal to a digital signal. A channel selection signal processing section generates a demodulated signal from the intermediate frequency signal converted to the digital signal. A mode control section switches the operating mode of the quadrature demodulator between a zero intermediate frequency mode and a low intermediate frequency mode in accordance with the radio wave reception conditions.

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Tokyo, Japan

Tomoaki Hirota