SWITCHING CIRCUIT FOR CANCELLING THE DIRECT SOUND TRANSMISSION FROM THE LOUDSPEAKER TO THE MICROPHONE IN A LOUDSPEAKING TELEPHONE SET

• 1. 用于无线麦克风和扬声器的声学回音消除的系统和方法 [P] . 中国专利： CN103348700B . 2016.09.07
• 2. 用于无线麦克风和扬声器的声学回音消除的系统和方法 [P] . 中国专利： CN103348700A . 2013-10-09
• 3. HANDSFREE LOUDSPEAKING KEY TELEPHONE SET AND A SWITCHING CIRCUIT FOR USE IN A MICROPHONE AND LOUDSPEAKER EQUIPPED KEY TELEPHONE [P] . CA997492A . 1976-09-21

  机译： 用于麦克风和扬声器安装的按键电话的手动扩音按键电话装置和切换电路

• 4. Handsfree loudspeaking key telephone set and a switching circuit for use in a microphone and loudspeaker equipped key telephone [P] . 美国专利： US3904834A . 1975-09-09

  机译： 免提扬声器按键电话机和用于配备麦克风和扬声器的按键电话的开关电路

• 5. Coupling circuit for telephone set - has two differential amplifiers cross-coupled between single bidirectional transmission line, microphone and loudspeaker [P] . 德国专利： DE2019395B2 . 1980-06-12

  机译： 电话机的耦合电路-在单个双向传输线，麦克风和扬声器之间交叉耦合有两个差分放大器

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• 2. A Cerebellum-like Circuit in the Auditory System Cancels Self-Generated Sounds. [D] . Singla, Shobhit. 2017
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• 4. Bounds on the Size of Sound Monotone Switching Networks Accepting Permutation Sets of Directed Trees [O] . Brakensiek, Joshua, Potechin, Aaron 2013

• 1. Unidirectional Sound Signage for Speech Frequency Range Using Multiple-Loudspeaker Reproduction System [J] . Vecky Canisius Poekoel ,Koshiro Hira ,Yoshifumi Chisaki . 声学期刊（英文） . 2013,第4期
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