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Digital wireless voice frequency transmission system and method based on 2.4GHz frequency

A digital wireless and transmission system technology, applied in the direction of digital transmission system, transmission system, voice analysis, etc., can solve problems such as inappropriate interpolation method, sound quality limitation, plosive sound, etc., to achieve improved safety, high security, eliminate The effect of digital noise

Inactive Publication Date: 2013-07-17
恩平市超达工业园管理有限公司
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Problems solved by technology

The traditional method is often to determine whether the data of the current frame is wrong by checking, and discard it if it is wrong, and use the data of the previous frame for filling or interpolation. This interpolation method is not suitable. When the error code is sent, it will lead to serious problems such as plosive sound and distortion.
The existence of the above problems severely limits the sound quality of traditional wireless audio transmission

Method used

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  • Digital wireless voice frequency transmission system and method based on 2.4GHz frequency
  • Digital wireless voice frequency transmission system and method based on 2.4GHz frequency
  • Digital wireless voice frequency transmission system and method based on 2.4GHz frequency

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Embodiment Construction

[0040] refer to figure 1 - Figure 8 , the digital wireless audio transmission system based on 2.4GHz frequency of the present invention, its digital wireless audio transmission microphone includes:

[0041] The sound pickup processing module 1 is used to pick up sound and amplify the voice signal, and carry out filter processing to the voice signal; the sound pickup processing module 1 includes and is connected to the voice signal along the flow direction of the voice signal: a front audio amplification processing unit 11, a filter processing Unit 12; the front audio amplifier processing unit 11 adopts a large dynamic, low noise, high linearity, low distortion, adjustable gain, differential input, integrated line audio amplifier; in the filtering processing unit 12, carry out the low-pass filtering before the necessary quantization Processing to eliminate aliasing distortion, equalization filtering can achieve any desired frequency response curve.

[0042] Coding module 2, ...

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Abstract

The invention discloses a digital wireless voice frequency transmission system and method based on a 2.4GHz frequency. Forward error connection (FEC) coding, interleaved coding and corresponding FEC decoding and de-interleaving processing are adopted for 2.4GHz digital radio frequency signals, frequency hopping control and frequency modulation synchronous tracking are adopted for 2.4GHz digital radio frequency signals simultaneously, so that wireless audio transmission error codes or staccato can be avoided effectively, and multi-path interference and discrete co-channel interference can be avoided simultaneously; the signal transmission safety can be effectively improved through encryption; and a digital wireless audio transmission microphone performs low-pass filtering before digitizing voice signals, so that high-frequency digital clutters can be eliminated. Through the digital wireless voice frequency transmission system and method, wireless audio transmission error codes, multi-path interference, electromagnetic interference, discrete co-channel interference and aliasing distortion can be avoided effectively, and the system and the method are high in fidelity and safety and wide in bandwidth.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a digital wireless audio transmission system and method based on 2.4GHz frequency. Background technique [0002] At present, wireless audio transmission systems generally use VHF and UHF frequency bands as carrier signals to transmit audio signals. This process is the processing of analog signals; it is easy to be interfered in the process of transmitting audio signals, especially when the system has poor electromagnetic compatibility. When using a high-power device, its interference can easily affect this type of traditional wireless audio transmission system, often causing problems such as crosstalk, broken sound, popping sound, etc., which will reduce the signal-to-noise ratio of the signal. [0003] For analog systems, disturbances can appear as noise. Interference outside the audio range can be easily filtered out by a simple low-pass or band-pass filter, and the digit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00G10L19/005
Inventor 郑少凡
Owner 恩平市超达工业园管理有限公司
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