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1.发明授权FM receiver having improved audio quality in response to Rayleigh faded received signals 失效FM接收机响应于瑞利衰落的接收信号具有改善的音频质量
公开(公告)号：US4792991A
公开(公告)日：1988-12-20
申请号：US124409
申请日：1987-11-18
申请人： Orville M. Eness
发明人： Orville M. Eness
CPC分类号： H03G3/3052 , H04B1/1027
摘要： The present invention minimizes noise pops due to Rayleigh fades by controlling receiver gain relative to the average received signal strength so that only a predetermined level of limiting occurs prior to the recovery of the audio information. The amount of limiting is selected so that a significant Rayleigh fade will cause the amplified IF signal to drop below the limiting level and enter the linear amplification region. During the fade the magnitude of the signal provided to the discriminator decreases thereby decreasing the discriminator's output and minimizing the magnitude of the audio pop. Additional minimization of the subject noise pops is achieved by utilizing a discriminator which has a square law transfer characteristic so that the recovered audio level will decrease 2 dB for every 1 dB decrease in input signal level.
摘要翻译： 本发明通过相对于平均接收信号强度控制接收机增益来最小化由于瑞利衰落引起的噪声波动，使得在恢复音频信息之前只发生预定的限制水平。 选择限制量，使得显着的瑞利衰落将使放大的IF信号降至低于限制电平并进入线性放大区域。 在衰减期间，提供给鉴别器的信号的幅度减小，从而减小鉴别器的输出并最小化音频流行音量。 通过利用具有平方律转移特性的鉴别器来实现对象噪声波动的附加最小化，使得恢复的音频电平对于输入信号电平的每1dB减小将降低2dB。
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公开(公告)号：US3962553A
公开(公告)日：1976-06-08
申请号：US518827
申请日：1974-10-29
摘要： A battery saving system for a portable duplex communications system such as a portable telephone system includes a voice operated transmitter within each portable unit which automatically transmits radio signals upon application of audio signals thereto and discontinues transmission upon termination of the audio signals to conserve battery power. A companion receiver includes a fast acting squelch system to substantially eliminate the noise bursts occurring between transmissions by said portable unit.
摘要翻译： 用于诸如便携式电话系统的便携式双工通信系统的电池节省系统包括在每个便携式单元内的语音操作的发射机，其在施加音频信号时自动发送无线电信号，并且在音频信号终止时中止传输以节省电池电力。 伴随接收机包括快速静噪系统，以基本上消除由所述便携式单元发射之间发生的噪声突发。
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公开(公告)号：US5307370A
公开(公告)日：1994-04-26
申请号：US709523
申请日：1991-06-03
申请人： Orville M. Eness
发明人： Orville M. Eness
摘要： A frequency-hopping cordless telephone system is described which adds digitized audio to a pseudorandom frequency hopping pattern for voice encryption. The randomly selected start point of a very long pseudoramic pattern generator is transferred to the handset by way of an infrared path at each off-hook. In addition, the infrared path is used to synchronize the clocks of the handset and the associated base module when the cordless telephone is in an on-hook position.
摘要翻译： 描述了一种跳频无绳电话系统，其将数字化音频添加到用于语音加密的伪随机跳频模式。 每个摘机，通过红外线路将随机选择的非常长的伪全景图案发生器的起始点传送到手机。 此外，当无绳电话处于挂机位置时，红外路径用于同步手机和相关联的基座模块的时钟。
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公开(公告)号：US4464791A
公开(公告)日：1984-08-07
申请号：US410222
申请日：1982-08-23
申请人： Orville M. Eness
发明人： Orville M. Eness
IPC分类号： H04B17/00
CPC分类号： H04B17/0087 , H04B17/3912
摘要： A Rayleigh fader for use with signals such as single-sideband and AM radio signals applies those signals to a 90-degree power divider. Each of the outputs of the power divider is taken to a separate double balanced mixer. Each separate double balanced mixer receives a mixing input from a noise source that includes a voltage-to-current converter. Mixed outputs of the two double balanced mixers are re-combined in a power combiner to produce a Rayleigh faded output.
摘要翻译： 用于单边带和AM无线电信号等信号的瑞利推子将这些信号应用于90度功率分配器。 功率分配器的每个输出都被送到一个单独的双平衡混频器。 每个单独的双平衡混频器从包括电压 - 电流转换器的噪声源接收混合输入。 两个双平衡混频器的混合输出在功率合成器中重新组合以产生瑞利衰减输出。
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