Many microphones are not unfamiliar to us, but lavalier microphones may be used less in our daily life, such as self-media, interviews, etc. We will use more, it can receive the voice of people speaking, avoid the outside world Noisy sound. Next, let's take a look at the relevant knowledge of the lavalier microphone!
1. Main features of the lavalier microphone
1. Small size and light weight: the lavalier-shaped microphone weighs only 20g including rechargeable batteries. It is the smallest and lightest 2.4G product of its kind on the market. There is no dress requirement for the user, and there is no sense of weight when used for a long time. Easy to carry around, clean and hygienic and easy to manage.
2. Green and environmental protection: ultra-low wireless transmission power, electromagnetic wave radiation is only 1/90 of ordinary mobile phones. It is a veritable green wireless microphone to avoid the damage to the human body caused by being in the high-frequency and high-power radio wave environment for a long time. Adopt rechargeable lithium battery power supply mode to avoid damage to the environment caused by disposable dry batteries.
3. Strong anti-interference ability: Lavalier microphones can only be successfully matched when the receiver and transmitter are on the same channel. 48 channels can be switched in normal operation, and the anti-interference ability is strong. At the same place, 40 sets can be used at the same time , The signal is stable and the penetrating power is strong.
2. How to use the lavalier microphone
1. In the control module of the lavalier microphone, OFF is the state of recording with a mobile phone; ON is the state of recording with a SLR camera; the white metal one is the clip, which is mainly used to fix the microphone cable; open the metal clip Hanging, you can put a button battery inside.
2. At the fixed place of the lavalier microphone, including the lavalier, it can be clipped to the neckline for recording; microphone cotton protection head; microphone recording function; suitable for most recording equipment.
3. Pay attention when using it. Since the lavalier microphone is worn on the chest and far away from the mouth, the output volume will be greatly reduced. If the volume of the amplifier is turned up, it will easily produce howling.
Lavalier microphones are suitable for large-scale mobile conferences, recording, public communication, outdoor speeches, lectures and other occasions, with the characteristics of small size, light weight, and environmental protection. Shenzhen Maipinda Technology Co., Ltd. is a company specializing in the production and processing of electronic products and accessories, optoelectronic products, smart bracelets, children's companion robots, translators and other products. The above-mentioned lavalier microphone is one of the company's main products. It has intelligent noise reduction, built-in decoding chip, long-lasting battery, can be used for a long time without continuous power supply, and is compatible with multiple devices.
3. Composition description of lavalier microphone chip
It is mainly divided into two parts: pd protocol identification chip + bluetooth transmitter chip
1: PD protocol identification chip LDR6028 SOP8 is a USB-C DRP interface USB PD communication chip developed by Ledry Technology for Bridge devices in the USB Type-C standard. It has the function of switching Data Role and data master-slave switching, and is specially optimized for the USB-C compatibility of major mobile phone brands, and is suitable for the application scenario of mobile phone audio adapters.
2. Features
◇ SOP-8 package, the periphery is simplified, suitable for small frame design.
◇ Support USB PD 2.0, compatible with USB PD 3.0
◇ Provided to smart devices (computers, tablets, mobile phones) 5V PDO and REQUEST negotiation
◇ Automatically convert DR_SWAP to UFP mode
3. Application
◇ USB TYPE-C Audio Adapter
◇ USB Type-C HUB
◇ USB Type-C lavalier live microphone (please contact the original factory of Ledry for complete reference design)
2: Bluetooth audio
The current mainstream wireless microphones, or lavalier microphones and other products, the technology on the wireless side basically revolves around the following three directions:
1. The U-segment solution, which is the oldest and most widely used solution, has the disadvantages of high power consumption and high cost
2. Non-standard 2.4G solution, which is also the most flexible solution for personalization, but the disadvantage is that it is susceptible to interference and high cost
3. Use Bluetooth BLE technology, which came out in the last 2 years. It takes advantage of Bluetooth's excellent anti-interference, standard protocol and other advantages to perfectly solve this problem.
Program parameters
The low-latency wireless microphone function supports the following three combination configurations:
(1) send and receive
a) Wireless microphone (single transceiver), MIC (slave)->BT->DAC (master)
b) Wireless USB microphone (single transceiver), MIC (slave)->BT->dongle->usb mic->PC/mobile phone (typec)
(2) Two sends and one receive
a) Wireless microphone (two transmissions and one reception), MIC (slave)->BT->DAC (master)
b) Wireless USB microphone (two transmissions and one reception), MIC (slave)->BT->dongle->usb mic->PC/mobile phone (typec)
(3) duplex
a) Downlink, PC/mobile phone (typec)->usb speaker->dongle ->BT->DAC (earphone)
b) Uplink, MIC (earphone)->BT->dongle->usb mic->PC/mobile phone (typec)
(4) Sending more than receiving
c) Wireless mic (multiple receiving), MIC (slave)->BT->DAC (master)
d) Wireless USB microphone (one send and multiple charges), MIC (slave)->BT->dongle->usb mic->PC/mobile phone (typec)
Ordinary wireless microphone solution:
Number of channels: mono
Sampling rate: 44.1K sampling rate (noise reduction is 32K)
Bit rate: 64kbps
Delay: 15~20ms (delay from mic transmission to receiving dac output)