首页>
外国专利>
Acoustic handset for telephone receiver designed to give voice feed-ba - designed to give voice feed-back with digital systems
Acoustic handset for telephone receiver designed to give voice feed-ba - designed to give voice feed-back with digital systems
展开▼
机译:用于电话接收机的声学听筒,旨在提供语音反馈功能-用于通过数字系统进行语音反馈
展开▼
页面导航
摘要
著录项
相似文献
摘要
The person speaking into a telephone handset is given feed-back of his own voice to prevent him from speaking too loudly. With analogue systems this is provided by various means including the leakage associated with hybrid transformers and their line balancing. When digital telephony is used, these hybrids are not necessary and the cross-talk is unintelligible. This receiver uses a hollow handset with an acoustic passage linking the mouthpiece to the earpiece. The passage is designed to ensure that the relation of the acoustic pressure at the output to the input is -20dB at IkHz and has an attenuation slope of 20dB per octave.
展开▼