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1. 发明授权

US5708970A Wireless sound monitoring apparatus with subaudible squelch control 失效
标题翻译：无声音监控装置，具有低音静音控制
公开(公告)号：US5708970A
公开(公告)日：1998-01-13
申请号：US558059
申请日：1995-11-13
申请人： Perran V. L. Newman , Theodore B. Freese , Gary C. Lindenberger
发明人： Perran V. L. Newman , Theodore B. Freese , Gary C. Lindenberger
IPC分类号： G08B21/02 , H04B1/40 , H04Q9/02
CPC分类号： G08B21/0208 , G08B21/0222 , H04B1/40
摘要： In a wireless sound monitoring system, ambient sounds are monitored by a microphone and transmitted over a phase or frequency modulated transmitter to a receiver. A sound actuated switch responsive to ambient sounds louder than a predetermined level turns the transmitter on and causes a hidden tone to be generated. A delay circuit caused the hidden tone to be terminated before the transmitter is turned off when the sound level decreases. In the receiver, a mute circuit responds to the hidden tone to control the output of a loudspeaker, and thus, the hidden tone prevents a squelch tail from being heard. The monitoring unit also includes a pulse generator to cause the hidden tones to be generated at regular intervals, but with short pulse widths. In the receiver, a mute delay circuit prevents the un-muting of the loudspeaker in response to these short pulses, but as long as the hidden tone pulses are detected within a predetermined period of time, a visual indicator, an LED, will light to show the proper operation of the system. Each hidden tone detected will cause the LED to blink momentarily; however, if the hidden tones are not detected, the LED will be extinguished and a distinctive audio tone will be generated to alert the user.
摘要翻译：在无线声音监测系统中，环境声音由麦克风监测并通过相位或频率调制的发射机传输到接收机。响应于比预定水平更大的环境声音的声音致动开关使发射机接通并且产生隐藏的音调。当声级降低时，延迟电路在发射机关闭之前导致隐藏音被终止。在接收机中，静音电路响应隐藏音调以控制扬声器的输出，因此，隐藏的音调防止了静音尾部被听到。监视单元还包括脉冲发生器，以使得隐藏的音调以规则的间隔产生，但具有短的脉冲宽度。在接收机中，静音延迟电路可以防止响应于这些短脉冲的扬声器的静音，但是只要在预定的时间段内检测到隐藏的音调脉冲，则视觉指示器LED将会点亮到显示系统的正常运行。检测到的每个隐藏音都会导致LED瞬间闪烁; 然而，如果未检测到隐藏音，则LED将熄灭，并且将产生独特的音频音来提醒用户。

2. 发明授权

US5533959A Wireless remote monitors employing reassurance tones 失效
标题翻译：无线遥控显示器采用保证音
公开(公告)号：US5533959A
公开(公告)日：1996-07-09
申请号：US199943
申请日：1994-02-22
申请人： Perran V. L. Newman , Niel P. Zeller , Dwight D. Ifland
发明人： Perran V. L. Newman , Niel P. Zeller , Dwight D. Ifland
IPC分类号： G08B29/02 , G08B23/00
CPC分类号： G08B29/02
摘要： A wireless audio monitoring system includes a reassurance tone generator for providing the user with assurance that a receiving unit is within range of the monitoring unit's transmitter and that both are operating properly. The reassurance signal is a brief audible tone transmitted at regular intervals by the monitoring unit to the receiving unit. The reassurance tone is either injected as sound into the monitoring unit's microphone, as an electronic signal into the microphone's amplifier or directly into the transmitter. A typical reassurance tone is a quarter-second long audible tone that occurs every ten seconds. At the receiving unit, the user has the option of either hearing or not hearing the reassurance tone by either eliminating the tone itself or by muting the loudspeaker during the time the reassurance tone is being received. Alternatively, the reassurance tone is turned on or off at the monitoring unit by means of a radio control signal sent from the receiving unit.
摘要翻译：无线音频监控系统包括一个保证音发生器，用于向用户提供接收单元在监视单元的发射机的范围内并且两者正常工作的保证。保证信号是由监视单元以规则的间隔发送到接收单元的简短可听音。保证音被作为声音注入到监控单元的麦克风中，作为电子信号输入到麦克风的放大器中，或直接放入发射机。典型的安心音是每十秒钟发生一次四分之一秒长的可听音。在接收单元处，用户可以通过消除音调本身或通过在接收到保证音之前使扬声器静音来听取或不听到保证音。或者，通过从接收单元发送的无线电控制信号，在监视单元处打开或关闭确认音。

3. 发明授权

US6091329A Monitor/hands-free intercom 失效
标题翻译：监控/免提对讲机
公开(公告)号：US6091329A
公开(公告)日：2000-07-18
申请号：US937482
申请日：1997-09-25
申请人： Perran V. L. Newman
发明人： Perran V. L. Newman
IPC分类号： G08B21/02 , H04B1/40 , H04Q1/48
CPC分类号： G08B21/0208 , G08B21/0222 , H04B1/40
摘要： A monitor/hands-free intercom system includes a child unit and a parent unit which are each transceivers. The parent unit operates primarily as a receiver, unless and until a talk switch is actuated on the parent unit, enabling the parent unit to transition to a transmitter. The child unit acts primarily as a transmitter unless and until it detects a carrier signal at the appropriate frequency during one of its short sniff periods. If a carrier signal is detected, the child unit extends the sniff period to look for a non-audible hidden tone encoded into the transmission from the parent unit. If the hidden tone is detected, the child unit transitions to a receiver mode and is able to play back the sound waves detected by the parent unit so that the parent can reassure or provide instructions to the child.
摘要翻译：监视器/免提对讲系统包括每个收发器的子单元和母单元。母单元主要作为接收器工作，除非和直到在主单元上启动通话开关，才能使母单元转换到发送器。子单元主要作为发射器起作用，除非并且直到在其短的嗅觉周期之一期间以适当的频率检测到载波信号。如果检测到载波信号，则子单元延长嗅探周期以从母单元寻找编码到传输中的非可听隐藏音。如果检测到隐藏音，则子单元转换到接收器模式并且能够播放由父单元检测到的声波，使得父母可以向孩子放心或提供指令。

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