助听装置
There are a number of devices that can assist hearing in a variety of settings.
大面积监听系统
Large area listening systems are the most popular of all hearing enhancement devices, 在剧院里使用, 电影院, 礼堂和礼拜堂. 有三种基本类型:调频收音机, infra-red (IR) light and a looped wire around the room, 称为感应回路. All of these technologies work well, but each has its own unique advantages and disadvantages. Each device works by picking up the sound at the source, 比如电影的音轨, or from one or more microphones and transmitting the signal to special receivers that you wear. The different technologies may be more appropriate for certain types of situations.
电视收听系统
本质上, these systems work on the same principle as large area listening systems, 但规模较小. The sound is picked up at the source and transmitted via radio, 光或电磁波进入你的耳朵. 以通常的形式, you either locate the microphone by the television loudspeaker, or plug a wire into the audio-output jacks in the back of the television set. These wires connect to a small IR or FM transmitter, which broadcasts a radio or light signal to the same type of special receivers used with large-area systems.
Some of the receivers contain all of the electronics in the headset; others fit on the body or dangle from the ear, 听诊器类型. 而不是个人接收器, it is possible to transmit the radio signal to small external loudspeakers that are placed close to the listener. For example, when the individual cannot manage a personal receiver. 当你使用任何一种电视监听设备时, you should be able to set your own loudness independent of everyone else.
会议麦克风
For people who have to attend frequent meetings, a conference microphone is designed to help. 通常以十大赌博靠谱网络平台者为中心, perhaps a bit closer to those who are seated farther away from the individual. The microphone picks up the speech of others and transmits it to a listener wearing a special receiver. 在某种意义上, it works in the same way as large-area and television listening devices, by picking up sound closer to the source and transmitting it to the hearing-impaired individual.
Conference microphones usually are fairly small and can operate either on a FM or IR principle. 它们可以是电池供电或交流供电, and can include extra microphones on long cords to further enhance reception. Since they are designed to pick up sound emanating from as far as 20 feet way, 它们也可以用作讲台麦克风. This permits the speaker to move around the podium and still be heard, although a lapel microphone clipped to the talker is preferable. Some people will use them in the middle of a dining room table. 这也可以很好地工作, provided that the diners will agree to be somewhat disciplined in their conversation by speaking one at a time.
个人调频系统
FM listening systems have been used in educational settings for hearing-impaired children for over 30 years. They are an effective way of directly increasing the level of the speech signal relative to the noise. 这些最好被概念化为调频收音机, with a transmitter broadcasting the desired signal to a FM receiver worn by the listener. Modern FM receivers are incorporated in some behind-the-ear hearing aids. In other words, the hearing aid can function as a FM receiver, as well as a personal hearing aid. The hearing aids can be set to receive the FM signal alone, 哪种方法在嘈杂的地方好用, 或者单独使用麦克风, 它的功能和普通助听器一样吗, 或者两者都有. The advantage of these systems is that they can function as a remote "third" ear, one that can be located close to the source of the desired sound.
放大电话
Designed for hearing-impaired people, these are special telephone handsets that amplify sound. There are those that automatically reset to zero after you hang up the phone, 为了防止下一个用户爆炸, 哪些人可能听力正常. There also are those that work on a "push to talk" principle, which are useful in noisy situations.
小型便携式“在线”放大器, 连接手机和底座, 也可用来放大电话信号. Some in-line amplifiers come with frequency equalizers to allow modifications of the amplified speech signal. 把脖子上的环塞进去, a severely hearing-impaired user can use the telephone coils in the hearing aids to listen with both ears. There are also answering machines that include an audio-output jack, 哪一种可以戴上颈环的双耳听力.
加州大学旧金山分校健康 medical specialists have reviewed this information. It is for educational purposes only and is not intended to replace the advice of your doctor or other health care provider. We encourage you to discuss any questions or concerns you may have with your provider.