The principle of hearing aids is roughly to convert sound signals into electrical signals through a “microphone”, through signal amplification and processing circuits, and then use a “receiver” to convert electrical signals into sound signals.
Nowadays, all kinds of pollution exist around life, among which noise pollution is also a serious one, which causes people’s hearing to be damaged, so there is a need to wear hearing aids.So, which hearing aid is better and how does it work?
Essentially, hearing aids are electronic products that amplify sound.But this is not a simple amplification, but a targeted processing based on the user’s hearing loss. Some sounds are louder, some are smaller, and advanced hearing aids need to process different signal sources separately to strengthen the user’s language understanding. ability.These instantaneous processing, environmental noise reduction, and automatic conversion functions require high-tech research and development to achieve.A set of speakers used by normal people will be expensive, not to mention the hearing impaired and deaf patients who have higher requirements for sound quality.
The basic structure of a hearing aid includes four main parts: microphone, amplifier, earphone, and power supply.The principle of hearing aids is to convert sound signals into electrical signals (electric energy) and send them to the amplifier. The amplifier amplifies the weak input electrical signal and then transmits it to the output transducer. The output transducer is composed of earphones or bone vibrators. Its function is to convert the amplified strong signal from electrical energy into acoustic signal (sound energy) or kinetic energy for output.Therefore, the signal transmitted by the earphone or bone vibrator is much stronger than the signal received by the microphone, which can compensate the hearing impaired to varying degrees.Hearing loss.
More typical digital Hearing aid , Consists of seven parts:
The first part is the microphone (microphone), which is responsible for converting the input acoustic signal into an electrical signal in an analog manner;
The second part is the input signal processor, which is responsible for converting analog signals into digital signals;
The third part of the shunt device is responsible for dividing the digital signal into several signal processing channels;
The fourth part is a signal processing device, which has the ability to process signals independently, flexibly and reasonably;
The fifth part is the integration device, which is responsible for combining the signals from different channels into high and low frequencies for calculation;
The sixth part combines the high and low frequency signals completed in the previous section and outputs them in digital form;
The seventh part is the receiver, which is responsible for restoring electrical signals to acoustic signals.