An internet radio plays audio delivered as a stream over the internet, rather than tuning to a conventional radio-frequency broadcast. The station encodes its program and makes it available through a streaming server; the radio finds a station, connects to its stream, buffers and decodes the audio, then plays it. Wi-Fi is usually the radio’s connection to the home network, while a station directory helps you find streams—it does not ensure that a listing is live or compatible with your device.
What happens when you press Play?
- The station creates its program. Audio may come from a live studio or an automated playout system.
- An encoder prepares the audio. It compresses the program into a digital audio format, or codec, suitable for streaming.
- A server makes the stream available. The streaming server accepts connections from listeners and delivers the audio. Larger services may use content-delivery infrastructure to distribute it.
- Your radio connects to the internet. In a typical home setup, Wi-Fi links the radio to the router, which provides access to the internet. Some radios also support wired Ethernet.
- The radio finds the selected station. You might choose it from a directory or a saved preset. The directory provides the listing; the radio then connects to the station’s stream.
- The radio buffers, decodes and plays. A short buffer holds incoming data before playback to smooth brief delivery variations. The device decodes a format it supports and plays the sound. Stream metadata may also show a station name, artist or program information.
IEEE Technology Navigator describes the basic system as three components: “An internet radio service relies on three functional components: an encoder that converts audio into a compressed digital format, a streaming server that accepts listener connections and pushes the audio stream, and a client application that buffers and plays the audio stream.” In a dedicated radio, the client is the device’s playback software; in another setup, it may be an app.
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What Wi-Fi does—and why buffering happens
Wi-Fi is the local wireless connection between the radio and your router. It is not the radio signal from the station: the radio still needs working internet access through the router to reach the station’s stream and, when applicable, a directory. A weak or unstable connection can interrupt delivery.
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The buffer can absorb a brief slowdown, but it cannot keep playback going indefinitely if data arrives too slowly or the stream stops. If a radio repeatedly pauses or drops out, Naim’s troubleshooting guidance recommends checking that the connection is strong and stable, moving the device closer to the router, or trying Ethernet if the radio supports it. A dropout does not, by itself, prove that Wi-Fi is the cause; the stream, service or device may also be involved.
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What a station directory does
A directory is a station-discovery service. It organizes listings so you can browse or search, commonly by location, genre or language. For example, Naim describes its app as using a curated directory; the Sonoro STREAM SO-411 manual describes local-station listings, keyword search, location, popularity, and discovery by origin, genre and language.
The directory and the streaming server have separate jobs. A directory helps your radio locate a station listing; playback still depends on the radio reaching a working stream in a format and delivery method it can handle. Listings can become stale, and a station’s stream may be unavailable even while its entry remains visible. A directory entry is therefore not proof that a station is currently broadcasting online.
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Codecs, protocols and station compatibility
A codec describes how audio is encoded. A streaming protocol describes how the stream is delivered to the player. IEEE Technology Navigator lists MP3, AAC+, Ogg Vorbis and Opus as examples of codecs used in internet radio, and describes delivery over HTTP using Icecast or SHOUTcast, or through HLS. These are examples of technologies used in the field, not a list of formats supported by every radio.
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- Which codecs and streaming protocols does the radio support?
- Which directory or internet-radio service does it use, and does it offer the stations you want?
- Does it connect over Wi-Fi, Ethernet or both?
- Can it display station and track information, and does it have useful presets?
- Does it include other radio modes or audio inputs you need?
These features vary by model. The Roberts and Sonoro manuals describe their respective devices, not every internet radio.
Why won’t an internet radio play a station?
Use the pattern of the problem to narrow it down. These checks can distinguish a connection issue from a station-specific or compatibility issue; they do not identify a cause with certainty.
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- FM radio: Ordinary FM band without internet access. Can display radio texts if available.
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- Personalize your favourite list up to 99 presets: Easy to manage favourites from FM and Internet radio in ONE list via 3 quick preset or remote control. Free to add new audio stream URL.
- Option to display the time when radio is playing, the backlight is adjustable, can be totally off / Multi-languages menu display / Remote control.
- No stations play: Check that the radio is connected to Wi-Fi and that the network has internet access. Try another known station. If playback repeatedly buffers, improve network stability or test Ethernet if available.
- Only one station fails: Try other stations. The station’s stream could be temporarily unavailable, its directory listing could be out of date, or its format or protocol could be incompatible with the radio. Check the device’s compatibility details before assuming the radio itself is faulty.
- The station plays, but the display is blank or incomplete: Track and program metadata may not be provided or exposed consistently. The Sonoro manual qualifies station information with “if available.”
- Playback pauses or drops out: Check signal strength, the radio’s distance from the router and the stability of the network. If supported, compare Wi-Fi with a wired Ethernet connection.
How internet radio differs from broadcast radio
Conventional broadcast radio delivers a radio-frequency signal for a receiver to tune in. Internet radio delivers digital audio through a network connection: the station encodes and serves the program, and the listener’s device connects to the stream. That makes internet access and stream compatibility part of the listening chain, alongside the radio itself.
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