Receiver circuit for digital and analog modulated signal
First Claim
1. A receiver circuit for receiving both digital and analog modulated signals, comprising:
- a frequency converter for converting digital and analog modulated high frequency signals into respective intermediate frequency signals;
a root Nyquist bandpass filter for limiting the intermediate frequency signal from said frequency converter to a frequency band based on root Nyquist characteristics;
an intermediate frequency signal linear amplifier for linearly amplifying the intermediate frequency signal that has passed through said root Nyquist bandpass filter;
a limiter amplifier for limiting to a constant amplitude the intermediate frequency signal from said intermediate frequency signal linear amplifier;
a digital demodulator connected to said limiter amplifier for demodulating the digital modulated intermediate frequency signal from said limiter amplifier; and
an analog demodulator connected to said limiter amplifier parallel to said digital demodulator for demodulating the analog modulated intermediate frequency signal from said limiter amplifier.
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Accused Products
Abstract
A receiver circuit for receiving both digital and analog modulated signals has a high frequency amplifier for amplifying digital and analog modulated high frequency signals, a down conversion block for converting an output signal from the high frequency amplifier into an intermediate frequency signal, a root Nyquist bandpass filter for limiting the intermediate frequency signal from the down conversion block to a frequency band based on root Nyquist characteristics, an intermediate frequency signal linear amplifier for linearly amplifying the intermediate frequency signal from the root Nyquist bandpass filter, a limiter amplifier for limiting to a constant amplitude the intermediate frequency signal from the intermediate frequency signal linear amplifier, a received signal intensity detector for detecting received signal intensity information from the intermediate frequency signal from the intermediate frequency signal linear amplifier, a synchronizing clock signal generator for generating a synchronizing clock signal from the received signal intensity information from the received signal intensity detector, a digital demodulator for demodulating a digital modulated intermediate frequency signal from the limiter amplifier based on the synchronizing clock signal, and an analog demodulator for demodulating an analog modulated intermediate frequency signal from the limiter amplifier.
15 Citations
6 Claims
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1. A receiver circuit for receiving both digital and analog modulated signals, comprising:
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a frequency converter for converting digital and analog modulated high frequency signals into respective intermediate frequency signals; a root Nyquist bandpass filter for limiting the intermediate frequency signal from said frequency converter to a frequency band based on root Nyquist characteristics; an intermediate frequency signal linear amplifier for linearly amplifying the intermediate frequency signal that has passed through said root Nyquist bandpass filter; a limiter amplifier for limiting to a constant amplitude the intermediate frequency signal from said intermediate frequency signal linear amplifier; a digital demodulator connected to said limiter amplifier for demodulating the digital modulated intermediate frequency signal from said limiter amplifier; and an analog demodulator connected to said limiter amplifier parallel to said digital demodulator for demodulating the analog modulated intermediate frequency signal from said limiter amplifier. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification