Emergency vehicle radio transmission system
First Claim
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1. Emergency vehicle radio transmission system, comprising, in combination:
- audio source means for providing an audio output to be broadcast;
audio processor means for processing the output of the audio source means for broadcasting on AM frequencies and on FM frequencies;
AM band comb frequency generator means for generating AM band frequencies;
AM modulator means for modulating the amplitude of the processed audio output on the AM band frequencies;
first amplifier means for amplifying the modulated audio output on the AM band frequencies;
first antenna means for transmitting the amplified audio output on the AM band frequencies;
FM band comb frequency generator means for generating FM band frequencies;
FM modulator means for modulating the processed audio output on the generated FM band frequencies to provide a modulated FM output signal;
second amplifier means for amplifying the FM output signal on the FM frequency band; and
second antenna means for transmitting the amplifier FM output signal on the FM frequency band substantially simultaneously with the transmission on the AM band frequencies.
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Abstract
Radio transmission apparatus usable for emergency vehicles transmits a radio frequency signal on both standard AM frequencies and FM broadcast frequencies to alert vehicles in the path of the emergency vehicle that the emergency vehicle is approaching. The frequencies are broadcast over the entire frequency spectrum so that vehicles using their radios will receive the signal, regardless of what particular frequency is being tuned by their receivers. A crystal controlled oscillator using frequency dividers generates carrier frequencies that are precisely on each AM and FM frequency.
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Citations
15 Claims
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1. Emergency vehicle radio transmission system, comprising, in combination:
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audio source means for providing an audio output to be broadcast; audio processor means for processing the output of the audio source means for broadcasting on AM frequencies and on FM frequencies; AM band comb frequency generator means for generating AM band frequencies; AM modulator means for modulating the amplitude of the processed audio output on the AM band frequencies; first amplifier means for amplifying the modulated audio output on the AM band frequencies; first antenna means for transmitting the amplified audio output on the AM band frequencies; FM band comb frequency generator means for generating FM band frequencies; FM modulator means for modulating the processed audio output on the generated FM band frequencies to provide a modulated FM output signal; second amplifier means for amplifying the FM output signal on the FM frequency band; and second antenna means for transmitting the amplifier FM output signal on the FM frequency band substantially simultaneously with the transmission on the AM band frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification