FM transmitter
First Claim
1. An FM transmitter comprising:
- an oscillator connected with a crystal oscillator;
a clock generating circuit which generates a clock signal synchronized with a signal formed by frequency-dividing an output signal of the oscillator;
a digital signal processor to which the clock signal generated by the clock generating circuit is inputted as an operating clock, and which performs a stereo modulating operation to stereo data by digital processing; and
a carrier wave generating circuit to which a signal formed by frequency-dividing the output signal of the oscillator is inputted, and which generates a carrier wave synchronized with the inputted signal and having a frequency of an integer multiple of the frequency of the inputted signal,the FM transmitter transmitting an FM modulation signal formed by frequency-modulating a stereo composite signal obtained by the stereo modulating operation performed by the digital signal processor.
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Accused Products
Abstract
An FM transmitter with improved degree of freedom in parts selection comprises: an oscillator connected with a crystal oscillator; a clock generating circuit uses a signal formed by frequency-dividing an oscillator output as a reference frequency, and which generates a clock having a frequency of an integer multiple of the frequency of the reference frequency; a DSP operates synchronously with the clock performing stereo modulation processing, FM modulation processing, and IQ modulation processing to inputted stereo data by digital processing; a frequency synthesizer generates a reference having a frequency an integer multiple of the frequency of the reference; mixers which mix signals outputted from the DSP with signals generated by the frequency synthesizer, respectively; an adder which adds outputs of the mixers; and an amplifier which amplifies an output signal of the adder and transmits the amplified signal from an antenna.
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Citations
25 Claims
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1. An FM transmitter comprising:
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an oscillator connected with a crystal oscillator; a clock generating circuit which generates a clock signal synchronized with a signal formed by frequency-dividing an output signal of the oscillator; a digital signal processor to which the clock signal generated by the clock generating circuit is inputted as an operating clock, and which performs a stereo modulating operation to stereo data by digital processing; and a carrier wave generating circuit to which a signal formed by frequency-dividing the output signal of the oscillator is inputted, and which generates a carrier wave synchronized with the inputted signal and having a frequency of an integer multiple of the frequency of the inputted signal, the FM transmitter transmitting an FM modulation signal formed by frequency-modulating a stereo composite signal obtained by the stereo modulating operation performed by the digital signal processor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An FM transmitter comprising:
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an oscillator connected with a crystal oscillator; a clock generating circuit which generates a clock signal synchronized with a signal formed by frequency-dividing an output signal of the oscillator; a digital signal processor to which the clock signal generated by the clock generating circuit is inputted as an operating clock, and which performs a stereo modulating operation to stereo data by digital processing; and a carrier wave generating circuit to which the output signal of the oscillator is directly inputted, and which generates a carrier wave that is synchronized with the output signal and that has a frequency of an integer multiple of the frequency of the output signal, the FM transmitter transmitting an FM modulation signal formed by frequency-modulating a stereo composite signal obtained by the stereo modulating operation performed by the digital signal processor. - View Dependent Claims (21, 22)
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23. An FM transmitter comprising:
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an oscillator connected with a crystal oscillator; a clock generating circuit which generates a clock signal synchronized with an output signal of the oscillator; a digital signal processor to which the clock signal generated by the clock generating circuit is inputted as an operating clock, and which performs a stereo modulating operation to stereo data by digital processing; and a carrier wave generating circuit to which a signal formed by frequency-dividing the output signal of the oscillator is inputted, and which generates a carrier wave synchronized with the inputted signal and having a frequency of an integer multiple of the frequency of the inputted signal, the FM transmitter transmitting an FM modulation signal formed by frequency-modulating a stereo composite signal obtained by the stereo modulating operation performed by the digital signal processor. - View Dependent Claims (24, 25)
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Specification