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    • 10. 发明授权
    • Radio information broadcasting and receiving system
    • 无线电信息广播和接收系统
    • US5581576A
    • 1996-12-03
    • US371621
    • 1995-01-12
    • Alphonso P. LanzettaLawrence S. Mok
    • Alphonso P. LanzettaLawrence S. Mok
    • H04H20/34H04H20/86H04L5/06H04L27/00H04L27/28
    • H04H20/34H04H20/86H04L5/06
    • A radio information broadcasting and receiving system consisting of three major parts: an FM transmitter station with subcarrier multiplexing capability, an FM receiver apparatus with subcarrier demodulation capability, and a computer connected in combination with the receiver apparatus. The FM transmitter station includes sources of main programming signals first digital data signals and second digital data signals. The first and second digital data signals are modulated by subcarrier 1 and subcarrier 2 frequencies respectively and are mixed with the main program signal and then transmitted. The transmitted signals are received by a receiver apparatus including an FM receiver circuit and an FM demodulator circuit for receiving the broadcast signal and demodulating it. The demodulated main program audio frequency signal is applied through a filter/deemphasis circuit and amplifier to speaker to provide an audio output. The first subcarrier frequency signal is demodulated by a first subcarrier frequency generator to provide a digital signal of the text portion of the transmitted signal which is then applied to a first input port of this digital computer. Likewise, the second subcarrier frequency is demodulated and the resultant index digital data signal is applied to a second input port of the computer.
    • 一种无线电信息广播和接收系统,包括三个主要部分:具有子载波复用能力的FM发射机站,具有子载波解调能力的FM接收机设备,以及与接收机设备组合连接的计算机。 FM发射台包括主编程信号源,第一数字数据信号和第二数字数据信号。 第一和第二数字数据信号分别由副载波1和子载波2频率调制,并与主节目信号混合后发送。 所发送的信号由包括FM接收机电路和用于接收广播信号并对其进行解调的FM解调器电路的接收机装置接收。 解调的主程序音频信号通过滤波器/去加重电路和放大器施加到扬声器以提供音频输出。 第一副载波频率信号由第一副载波频率发生器解调,以提供发送信号的文本部分的数字信号,该数字信号然后被施加到该数字计算机的第一输入端口。 类似地,解调第二副载波频率,并将所得到的索引数字数据信号施加到计算机的第二输入端口。