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Bluetooth or WiFi? How does my wireless microphone work?
With the widespread adoption of technology, even before using wireless microphones, wireless IEMs, and other wireless audio equipment, most people have already experienced radio broadcasts or used products like Bluetooth headphones and speakers. Internet connectivity also relies on mobile 4G/5G or wireless WiFi base stations. Such wireless experiences have become integral to different aspects of our daily lives. Because of this familiarity, people generally aren’t strangers to wireless technology, but this creates some gray areas in understanding. When users transition from consumer products to audio equipment (such as wireless microphones or wireless IEMs), misconceptions arise, sometimes leading to frustration with signal issues during use. Cloudvocal aims to help everyone better understand wireless technology principles and potential limitations through this knowledge compilation, so that when building your own wireless systems in the future, you can achieve expected results with the assistance of this knowledge.
Analog or Digital?
Wireless audio transmission methods are fundamentally divided into two different architectures: analog wireless and digital wireless.
Analog wireless transmits audio signals by modulating them onto carrier waves. The AM or FM radio broadcasts we heard everyday are examples of this technology application. Under ideal conditions, analog wireless can achieve ultra-low latency and excellent audio quality, but real-world environments always have various sources of interference. Therefore, in modern audio-related equipment, only a small number of products still use analog wireless transmission methods, while others have moved toward digital development.
Digital wireless refers to technology that first samples and quantizes audio into digital data composed of 0s and 1s, transmits it through digital modulation of radio waves, and then decodes it at the receiving end to play back audio signals.
Although this transmission method introduces some latency and distortion during sampling, encoding, and decoding processes, it has gradually become mainstream in wireless audio equipment because it can more effectively combat interference and reduce noise generation. Here’s a comparison table of analog and digital wireless characteristics:
| Characteristics | Analog Wireless | Digital Wireless |
|---|---|---|
| Audio Quality | Medium, affected by noise | Stable high quality (depends on sampling) |
| Resistance to Interference | Medium (FM better than AM) | High (error correction and retransmission possible) |
| Spectrum Efficiency | Low, requires bandwidth buffer | High (same-frequency multi-channel transmission, data compression) |
| Security | Almost none (easily intercepted) | Encrypted transmission possible |
| Feature Expansion | No | Can integrate control, synchronization, message transmission, etc. |
CloudVocal’s current ISOLO Wireless Performance System and EverSync Wireless Monitoring System are both applications of digital wireless technology.
What Do 24-bit and 48KHz Mean?
When we listen to music, we can hear the pitch variations and dynamic changes. Digital sampling converts these pitch and dynamic variations into binary data composed of 0s and 1s, which is the “data” that can be transmitted or stored. Bit depth refers to how many different volume levels can be distinguished during each sampling. x-bit means that from weak to strong, 2x values are used for recording. For example, 1-bit would have 2 levels, brutally converting all sounds into either sound or no sound, while 2-bit has only 4 levels: silent, quiet, medium, maximum volume. More levels allow for more precise dynamic variations.
Sampling rate refers to the frequency at which sound is sampled per second. 48KHz means sampling the sound waveform 48,000 times per second. The comparison diagram below illustrates the result differences when sampling the same sound wave at different sampling rates. Since the human ear can hear approximately up to 20,000 Hz, according to the Nyquist theorem, the sampling rate must be at least twice this frequency, meaning at least 40 KHz or higher for accurate sampling results.
If you want to hear the differences between various sampling rates and bit depths, you can listen to the differences in this video’s audio files:
Incidentally, during the CD era, the standard audio quality format was 16-bit, 44.1KHz.
What’s the Relationship Between 2.4GHz, 5.8GHz, and 4G/5G?
In wireless audio equipment, these values represent the electromagnetic wave frequency ranges used. From low to high frequencies, they have the following names and respective uses:
| Band Name | Frequency Range | Wavelength Range | Common Uses |
|---|---|---|---|
| VLF（Very Low Frequency） | 3 kHz – 30 kHz | 100 km – 10 km | Submarine communications, time-frequency synchronization (e.g., WWVB) |
| LF（Low Frequency） | 30 kHz – 300 kHz | 10 km – 1 km | Long-wave broadcasting, navigation (LORAN) |
| MF（Medium Frequency） | 300 kHz – 3 MHz | 1 km – 100 m | AM broadcasting (530–1700 kHz), maritime radio |
| HF（High Frequency） | 3 MHz – 30 MHz | 100 m – 10 m | Shortwave broadcasting, amateur radio (Ham), aviation communications |
| VHF（Very High Frequency） | 30 MHz – 300 MHz | 10 m – 1 m | FM broadcasting, wireless microphones, television (VHF), amateur radio |
| UHF（Ultra High Frequency） | 300 MHz – 3 GHz | 1 m – 10 cm | Wireless microphones, digital television, Wi-Fi, mobile phones (4G), walkie-talkies |
| SHF（Super High Frequency） | 3 GHz – 30 GHz | 10 cm – 1 cm | 5G, Wi-Fi (5GHz), radar, satellite communications, microwave links |
| EHF（Extremely High Frequency） | 30 GHz – 300 GHz | 1 cm – 1 mm | Millimeter-wave radar, satellite data, 6G forward-looking applications, millimeter-wave scanners |
These different frequency bands are like invisible “roads” for different types of wireless devices to use. For example, Cloudvocal’s ISOLO Wireless Performance System uses 2.4GHz wireless frequency, while EverSync uses 5.8GHz wireless frequency. Because these two devices use different “roads,” they won’t interfere with each other’s reception when used simultaneously.
Just as roads have expressways, fast lanes, slow lanes, and sidewalks that cannot be used arbitrarily or crossed, wireless frequency bands are also subject to regulatory control by various governments. Particularly important frequency bands like military, aviation, and emergency services, as well as economically valuable mobile communication bands, are regulated and cannot be used arbitrarily. This explains why UHF band wireless equipment (concentrated between 470MHz~698MHz), despite having very stable reception and being better suited for dense, multi-person equipment interference situations, requires special adjustment and certification due to regulatory certification requirements in different countries and cannot be used globally.
In contrast to strictly government-regulated frequency bands, the international community has also established ISM (Industrial, Scientific and Medical) frequency bands that can be used by industrial, scientific, and medical equipment without requiring license applications (but still need to pass relevant inspections). Daily-use items like wireless networks, Bluetooth music, wireless mice, wireless keyboards, remote-control cars, and drones use the 2.4GHz frequency band, enabling them to adapt to the broadest market demands with minimal development and technical inspection costs.
In fact, ISM frequency bands like 2.4GHz that don’t require licenses aren’t the only ones available. They also include 5.8GHz (5.725 – 5.875 GHz), and even 433 MHz, 915 MHz, and other blocks, each suitable for different applications. They’re like open roads with different conditions—some wide, some less traveled—allowing various wireless devices to choose the most suitable channel according to their needs.
“4G” and “5G” refer to generations of mobile communication technology, and they use a very wide range of frequencies, from 700MHz to 3.5GHz and even up to 28GHz. The “G” in 5G stands for generation, not GHz. Sometimes certain 5G frequency bands are indeed close to 5GHz, but that’s just a coincidence. Many people hear “5G” and “5GHz,” or see “5G” written on wireless routers, and think they’re the same thing—this is a common misconception.
So, Does My Wireless Microphone Use Bluetooth or WiFi?
The short answer is: neither. Wireless microphones have their own protocols.
But the thinking behind this question reveals some easily confused concepts: We habitually use familiar “technology” names to infer how products work, but wireless device operation requires not only using specific frequency radio waves to transmit data, but also “transmission protocols” and “encoding/decoding” to ensure data can be successfully received at the receiving end and converted back into audible sound waves.
Wireless audio transmission can be imagined as packaging sound into parcels (encoding), sending them via different shipping companies (transmission protocols), through different transportation routes (wireless frequency bands), to recipients (receivers):
| Term | Explanation | You can think of it as… |
|---|---|---|
| Frequency Band | Radio frequency used (e.g., 2.4GHz, 5.8GHz) | Available roads (streets, alleys, highways) |
| Transmission Protocol | Logic format for data transmission (e.g., Bluetooth, Wi-Fi, proprietary protocols) | Shipping company (motorcycle courier, post office, delivery service) |
| Audio Encoding Format | How audio data is compressed or packaged (e.g., SBC, aptX, PCM) | Packaging method (convenience pack, cardboard box, custom packaging) |
Live performances require stable transmission of high-quality audio under extremely low latency conditions, so they use custom audio encoding and transmission protocols. Therefore, wireless microphones and receivers from different manufacturers cannot pair and connect with each other. Even within the same brand, there might be compatibility issues between different models due to version differences—this is caused by different trasmittion protocols.
Why Do Signal Dropouts Occur? How Can They Be Avoided?
Wireless signal dropouts typically result from several main causes:
- Interference: When other devices use similar or identical frequencies (such as Wi-Fi, Bluetooth, other wireless microphones), spectral overlap occurs, preventing receivers from correctly receiving signals.
- Equipment Design and Frequency hopping Issues: Some wireless systems that cannot automatically avoid interference channels or lack multi-frequency backup mechanisms are prone to dropouts when interference occurs.
- Obstruction: People, walls, instruments themselves, and even metal structures can block signal transmission.
- Excessive Distance or Poor Antenna Angle/Damage: If the distance between transmitter and receiver is too far, antenna directions are poor, or antennas are damaged, signals will weaken causing poor reception.
To avoid dropouts, you can:
- Avoid interfering frequency bands or use wireless systems with automatic frequency hopping. However, note that if there are too many devices with similar frequency bands in the space, transmission problems may still occur.
- Reduce obstructions between transmitter and receiver. Human bodies, walls, and metal structures all block signal transmission—if possible, try to minimize various barriers between them.
- Pay attention to antenna placement and reception angles. Some antennas have directional reception characteristics that enhance reception in specific directions.
Because the ISOLO wireless microphone system and EverSync wireless monitoring system use 2.4GHz and 5.8GHz frequency bands respectively, they won’t interfere with each other’s signals when used together. However, since many devices like networks, Bluetooth, wireless mice, and even microwave ovens use the 2.4GHz band, although ISOLO has built-in automatic frequency hopping transmission mechanisms that can stably transmit signals in most situations, it’s like a car with built-in autopilot and avoidance functions—when encountering highway traffic jams with cars front, back, left, and right, it cannot escape the traffic jam.
Using Knowledge to Build Systems Suitable for Yourself
Wireless technology hardware and software continue to develop today. New transmission protocols, compression algorithms, and frequency hopping mechanisms to avoid wireless interference are constantly breaking through and being invented, with practical applications of new technologies visible in continuously released new products. CloudVocal hopes that through sharing this knowledge content, we can help everyone have basic understanding when entering the world of wireless equipment, and also judge how to use them correctly to prevent wireless systems from generating interference.
In the future, CloudVocal will continue pursuing technological breakthroughs, allowing everyone to enjoy high-quality wireless performance experiences more easily and comfortably in various performance venues.
