Digital exciter/phasor/transmitter for directional antenna system
First Claim
1. A radio frequency transmission system incorporating an envelope delay within a broadcast signal to achieve a directional pattern, the system comprising:
- an oscillator configured to provide a digital carrier wave;
a delay stage in electrical communication with the oscillator to receive the digital carrier wave and further receiving digital audio, the delay stage configured to delay the digital carrier wave and digital audio by a delay value and to convert the digital carrier wave to an analog carrier wave and the digital audio to analog audio; and
a modulator in electrical communication with the delay stage and configured to provide amplitude modulation of the analog carrier wave with the analog audio to thereby generate an amplitude modulated carrier wave with an envelope delay.
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Abstract
A transmission system delays a carrier wave and program audio in the digital domain. The carrier wave and the program audio are converted to analog and the carrier wave is modulated by the program audio. The system includes a master oscillator that generates a digital carrier wave. The digital carrier wave is transmitted to a delay stage that delays the digital carrier wave by a certain delay value. The system further receives an analog or digital signal that is representative of programming. If an analog signal is received, the signal is transmitted to an analog-to-digital converter where it is converted to digital audio. The digital audio is then transmitted to a delay stage that delays the digital audio by the same delay value. The digital carrier wave and the digital audio are converted to an analog carrier wave and analog audio respectively. A modulator modulates the analog carrier wave by the analog audio and sends the amplitude modulated carrier wave to a power amplifier. After power amplification, amplitude modulated carrier wave is broadcast by a conventional antenna. The delay of the carrier wave and the program audio are controlled by a processor. The processor may also control the output power of respective power amplifiers.
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Citations
41 Claims
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1. A radio frequency transmission system incorporating an envelope delay within a broadcast signal to achieve a directional pattern, the system comprising:
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an oscillator configured to provide a digital carrier wave;
a delay stage in electrical communication with the oscillator to receive the digital carrier wave and further receiving digital audio, the delay stage configured to delay the digital carrier wave and digital audio by a delay value and to convert the digital carrier wave to an analog carrier wave and the digital audio to analog audio; and
a modulator in electrical communication with the delay stage and configured to provide amplitude modulation of the analog carrier wave with the analog audio to thereby generate an amplitude modulated carrier wave with an envelope delay. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for transmitting radio frequency, comprising:
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generating a digital carrier wave;
receiving digital audio;
delaying the digital carrier wave and the digital audio by a delay value;
converting the digital carrier wave and the digital audio to an analog carrier wave and analog audio; and
modulating the analog carrier wave with the analog audio to produce an amplitude modulated carrier wave with an envelope delay. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A radio frequency transmission system incorporating an envelope delay within a broadcast signal to achieve a directional pattern, the system comprising:
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an oscillator configured to provide a digital carrier wave;
a delay stage in electrical communication with the oscillator to receive the digital carrier wave and further receiving digital audio, the delay stage configured to delay the digital carrier wave and digital audio by a delay value;
a converter stage in electrical communication with the delay stage and configured to convert the digital carrier wave to an analog carrier wave and the digital audio to analog audio;
a modulator in electrical communication with the delay stage and configured to provide amplitude modulation of the analog carrier wave with the analog audio to thereby generate an amplitude modulated carrier wave with an envelope delay; and
an amplifier in electrical communication with the modulator and configured to amplify the power of the amplitude modulated carrier wave. - View Dependent Claims (18, 19, 20)
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21. A radio frequency transmission system incorporating an envelope delay within a broadcast signal to achieve a directional pattern, the system comprising:
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an oscillator configured to provide a carrier wave;
a modulator in electrical communication with the oscillator and configured to provide amplitude modulation of the carrier wave with audio input to thereby generate an analog amplitude modulated carrier wave; and
a delay stage in electrical communication with the modulator to receive the analog amplitude modulated carrier wave, the delay stage configured to convert the analog amplitude modulated carrier wave to a digital amplitude modulated carrier wave and create an envelope delay in the digital amplitude modulated carrier wave. - View Dependent Claims (22, 23, 24, 25, 26)
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27. A radio frequency transmission system incorporating an envelope delay within a broadcast signal to achieve a directional pattern, the system comprising:
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an oscillator configured to provide a digital carrier wave; and
a delay/modulator stage in electrical communication with the oscillator to receive the digital carrier wave, the delay/modulator stage configured to delay the digital carrier wave and received digital audio by a delay value, the delay/modulator stage further configured to modulate the digital carrier wave with the digital audio to generate an amplitude modulated carrier wave with an envelope delay. - View Dependent Claims (28, 29, 30, 31, 32)
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33. A method for transmitting radio frequency, comprising:
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generating an analog carrier wave;
receiving analog audio;
modulating the analog carrier wave with the analog audio to produce an amplitude modulated carrier wave;
converting the amplitude modulated carrier wave to a digital signal;
delaying the amplitude modulated carrier wave by a delay value; and
converting the amplitude modulated carrier wave to an analog signal. - View Dependent Claims (34, 35, 36)
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37. A method for transmitting radio frequency, comprising:
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generating a digital carrier wave;
receiving digital audio;
delaying the digital carrier wave and the digital audio by a delay value;
modulating the digital carrier wave and the digital audio to produce an amplitude modulated carrier wave with an envelope delay; and
converting the amplitude modulated carrier wave to an analog signal. - View Dependent Claims (38, 39, 40, 41)
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Specification