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    • 4. 发明授权
    • Communication device with time assigned duplex operation
    • 具有时间分配双工操作的通信设备
    • US5379279A
    • 1995-01-03
    • US86071
    • 1993-07-06
    • Charles A. BackofDavid L. Muri
    • Charles A. BackofDavid L. Muri
    • H04B1/48H04B1/56
    • H04B1/56H04B1/48
    • The communication device (100) operates in full duplex mode by allowing its transmitter (106) to periodically interrupt transmission to allow for a second communication device (702) to send its request-to-transmit signal. This signal is received by the receiver (108) and coupled to a controller (110). The controller (110) dynamically reduces the rate at which it codes the voice in response to the activity on the channel. The coded signal is then coupled to the transmitter (108) for transmission. A sync and control header is included at the beginning of each transmission to allow the two communication devices (100 and 702) to remain in sync and to be aware of the coding rate each of the communication devices (100 and 702) has employed in its most recent transmission. With the two communication devices (100 and 702) operating at dynamically adjusted voice coding rates, each occupies the channel for a portion of time in each frame commensurate with the information flow, thereby providing for full duplex operation.
    • 通信设备(100)通过允许其发射机(106)周期性地中断传输以允许第二通信设备(702)发送其请求发送信号来以全双工模式操作。 该信号由接收器(108)接收并耦合到控制器(110)。 响应于信道上的活动,控制器(110)动态地降低其对语音进行编码的速率。 编码信号然后被耦合到发射机(108)以进行传输。 在每个传输的开始处包括同步和控制报头,以允许两个通信设备(100和702)保持同步,并且知道每个通信设备(100和702)在其中使用的编码率 最近的传输。 利用两个通信设备(100和702)以动态调整的语音编码速率操作,每个通信设备在每个帧中占据与该信息流相称的一部分时间的信道,从而提供全双工操作。
    • 5. 发明授权
    • Efficient amplitude/phase modulation amplifier
    • 高效振幅/相位调制放大器
    • US5329259A
    • 1994-07-12
    • US986823
    • 1993-02-11
    • Robert E. StengelCharles A. Backof
    • Robert E. StengelCharles A. Backof
    • H03F3/60H04L27/36
    • H04L27/362H03F3/2176H03F3/602
    • A high efficiency amplitude/phase modulation amplifier circuit (100) includes a first (102) and a second (106) high efficiency amplifier. These amplifiers (102 and 106) amplify two constant amplitude/phase modulated signals. A combiner (104) combines the output signals from the amplifiers (102) and (106) to produce a combined signal to a load (108). Two shunt elements (202 and 204) are included to prevent the reactive components of the combined signal from reaching the amplifiers (102) and (106). With no reactive components reflected back, the amplifiers (102 and 106) can remain non-linear even though they are used to amplify an amplitude/phase modulated signal which includes Amplitude Modulation (AM) components.
    • 高效率幅度/相位调制放大器电路(100)包括第一(102)和第二(106)高效放大器。 这些放大器(102和106)放大两个恒定幅度/相位调制信号。 组合器(104)组合来自放大器(102)和(106)的输出信号以产生到负载(108)的组合信号。 包括两个并联元件(202和204)以防止组合信号的无功分量到达放大器(102)和(106)。 由于没有反射的分量反射回,放大器(102和106)可以保持非线性,即使它们被用于放大包括幅度调制(AM)分量的幅度/相位调制信号。