| HS Code | Official Doc | Tariff Rate | Origin | Destination | Effective Date |
|---|---|---|---|---|---|
| 8518402000 | Doc | 30.0% | CN | US | 2025-05-12 |
| 8543709100 | Doc | 55.0% | CN | US | 2025-05-12 |
| 8543906800 | Doc | 55.0% | CN | US | 2025-05-12 |
Audio Decoding Line
An audio decoding line, commonly referred to as an audio line-in, is an input port on a computer or other audio device used to receive analog audio signals from an external source. It facilitates the conversion of these signals into a digital format for processing and playback.
Material & Construction:
Typically, audio decoding lines utilize a 3.5mm TRS (Tip-Ring-Sleeve) connector, though RCA connectors are also common, particularly in older equipment or for connecting to stereo systems. The connector itself is usually made of metal (often gold-plated for improved conductivity and corrosion resistance) and encased in plastic. Internally, the line-in utilizes an Analog-to-Digital Converter (ADC) to transform the analog signal into a digital one. The quality of the ADC significantly impacts the fidelity of the captured audio.
Purpose:
The primary purpose of an audio decoding line is to allow users to record or process audio from external sources that do not have a direct digital connection (like USB). This includes devices such as:
- Turntables
- Cassette players
- Microphones (with pre-amplification)
- Older CD players
- Synthesizers
- Mixers
Function:
The audio decoding line receives the analog audio signal, amplifies it if necessary, and then converts it into a digital format that the computer can understand. This digital audio is then processed by the sound card or audio interface and can be used for various purposes, including:
- Recording audio in audio editing software
- Streaming audio online
- Broadcasting audio
- Live sound applications
Usage Scenarios:
- Digitizing Vinyl Records: Connecting a turntable to a line-in allows users to convert their vinyl collection into digital files.
- Recording Cassette Tapes: Similar to vinyl, cassette tapes can be digitized using a line-in connection.
- Connecting Microphones: Microphones often require a pre-amplifier to boost the signal to a usable level before being connected to a line-in.
- Audio Input for Streaming: Using a mixer connected via line-in to capture multiple audio sources for live streaming.
- Connecting External Audio Devices: Connecting synthesizers, drum machines, or other audio gear to a computer for recording or processing.
Common Types & Connectors:
- 3.5mm TRS: The most common type, found on most computers and laptops. Stereo signals are transmitted through this connector.
- RCA: Typically used in stereo systems and older audio equipment. Usually color-coded (red for right channel, white for left channel).
- 1/4" TRS: Often found on professional audio equipment, offering a more robust connection.
- XLR: Used for professional microphones and audio interfaces, providing a balanced signal and reduced noise. (Requires an audio interface with XLR inputs.)
Distinction from Microphone Input:
It's crucial to distinguish between a line-in and a microphone input. Microphone inputs are designed for low-level signals and often provide phantom power for condenser microphones. Using a line-level signal with a microphone input can result in distortion or damage to the audio circuitry. Conversely, using a microphone with a line-in input will likely result in a very weak and unusable signal.
Based on the provided information, the declared goods "audio decoding line" can be classified under the following HS codes:
- 8518402000: This HS code covers microphones and stands therefor; loudspeakers, whether or not mounted in their enclosures; headphones and earphones, whether or not combined with a microphone, and sets consisting of a microphone and one or more loudspeakers; audio-frequency electric amplifiers; electric sound amplifier sets; parts thereof: Audio-frequency electric amplifiers: Other. This could apply if the “audio decoding line” functions as part of an audio amplifier system. The tax rate details are: Basic tariff: 0.0%, Additional tariff: 0.0%, Additional tariff after 2025.4.2: 30.0%. The total tariff rate is 30.0%.
- 8543709100: This HS code covers electrical machines and apparatus, having individual functions, not specified or included elsewhere in this chapter; parts thereof: Other machines and apparatus: Other: Digital signal processing apparatus capable of connecting to a wired or wireless network for the mixing of sound. If the “audio decoding line” involves digital signal processing for sound mixing, this HS code is applicable. The tax rate details are: Basic tariff: 0.0%, Additional tariff: 25.0%, Additional tariff after 2025.4.2: 30.0%. The total tariff rate is 55.0%.
- 8543906800: This HS code covers electrical machines and apparatus, having individual functions, not specified or included elsewhere in this chapter; parts thereof: Parts: Other: Printed circuit assemblies: Other. If the “audio decoding line” is a component consisting of printed circuit assemblies, this HS code is relevant. The tax rate details are: Basic tariff: 0.0%, Additional tariff: 25.0%, Additional tariff after 2025.4.2: 30.0%. The total tariff rate is 55.0%.
It is important to note that the final HS code classification depends on the specific function and composition of the “audio decoding line”.