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US 6,389,082 B1Granted
Receiver
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMasami Takigawa, Hitonobu Furukawa, Akira Mishima, Hiroaki Ozeki
Life of this patent
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Abstract
In a receiver supporting multiple data rates, a sweep control range is calculated on the basis of the data rate of the carrier of the channel to be selected and sweep control is executed on the oscillated frequency by VCO 8 within the sweeping frequency range so that synchronization locking to the carrier is attained and thereby an erroneous channel selection is prevented.
Claims6
A receiver comprising:
- tuning means for converting a desired modulated carrier wave selected from a first intermediate frequency signal received by an antenna into a second intermediate frequency signal;
- a bandpass filter for limiting the second intermediate frequency signal for bandwidth;
- orthogonal detecting means supplied with an output signal of said bandpass filter for delivering an I baseband signal and a Q baseband signal orthogonal with each other;
- a voltage-controlled oscillator for feeding a signal for detection to said orthogonal detecting means;
- AD converters for converting the I and Q baseband signals into digital signals;
- digital demodulating means supplied with the I and Q baseband signals digitized by said AD converters for delivering a frequency error signal, a synchronism detection signal, and a demodulated signal;
- sweeping control means supplied with the frequency error signal and sweeping data for delivering a control voltage of said voltage-controlled oscillator;
- and
- a microcomputer supplied with a channel select command including carrier wave information and data rate information of the first intermediate frequency, the frequency error signal, and the synchronism detection signal, wherein said microcomputer
- delivers a tuning frequency setting value to said tuning means, and
- delivers the sweeping data to said sweeping control means.
8 more elements
Dependencies are inferred from the claim text.