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Radio transmitting-receiving method for digit audio frequency signal and wireless digital microphone

A digital audio and wireless transceiver technology, applied in the field of wireless digital audio signal transmission and wireless digital microphone, can solve the problems of high cost, complex design and structure of wireless microphone, no stereo function, etc., to improve sound quality, avoid interference, and facilitate control Effect

Inactive Publication Date: 2008-04-23
岑良森
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the radio microphone provided by CN200410028604.3 has a complex design structure and high cost with digital transmission and analog signal correction functions, does not have a stereo function, cannot directly realize volume control on the microphone microphone, and has an analog signal processing circuit The overall volume of the microphone still cannot be reduced to a portable size

Method used

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  • Radio transmitting-receiving method for digit audio frequency signal and wireless digital microphone
  • Radio transmitting-receiving method for digit audio frequency signal and wireless digital microphone
  • Radio transmitting-receiving method for digit audio frequency signal and wireless digital microphone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Please refer to figure 1 , The invention provides a method for wirelessly transmitting and receiving digital audio signals for a wireless digital microphone.

[0046] Specifically, the audio signal is converted into an analog signal at the sending device (such as a wireless microphone held by the user), for example, the captured audio signal is converted into an analog signal through an audio input unit and a pre-amplification circuit in sequence.

[0047] The analog signal is converted into a digital audio signal at the sending device, such as an A / D (analog / digital) conversion circuit with a built-in DSP (Digital Audio Signal Processor), which has an audio A / D conversion function, digital audio Processing functions (compression / digital filtering / smoothing / automatic level control circuit / electronic volume control, etc.). Specifically, the analog signal is converted into a 2*24bit*48KHz digital audio signal by using multi-bit Δ-Σ modulation and over-sampling technology...

Embodiment 2

[0053] Please refer to figure 2 and image 3 , in order to allow the user to directly adjust the volume of the output timbre on the microphone according to the needs, on the basis of Embodiment 1, the present invention also provides an electronic volume control method.

[0054] figure 2 It is one of the volume control processes. When the user presses the volume up button or the volume down button on the microphone, the program is started. First, it will be judged whether the press is a valid command. If it is judged to be due to shaking or other reasons If there is an error command formed, the volume adjustment process will not be performed. If it is a valid command, judge whether it is an increase command or a decrease command, and increase or decrease by 1 decibel each time (the range of each increase or decrease can be changed according to needs), when it reaches the set maximum or minimum When the value is reached, stop and continue to adjust. After the adjustment, t...

Embodiment 3

[0057] Please refer to Figure 4 and Figure 5 , in order to obtain better sound quality, audio integration processing is added on the basis of Embodiment 1 or Embodiment 2, and the audio integration processing includes audio splitting processing performed in the sending device and audio integration processing performed in the receiving device.

[0058] Figure 4 It is a flow chart of audio splitting performed in the sending device. After the analog signal is converted into a digital audio signal in the sending device, the digital audio signal is further subjected to audio splitting processing, and a 32-bit monophonic digital audio signal is split into two 16-bit monophonic digital audio signals, To form a false stereo effect, this process is completed by the PLD in the sending device. Among them, the I of the nRF24Z1 wireless digital audio transceiver chip 2 The S interface includes three signal ports: LR-clki or LR-clko left and right phase signal port, BCLK bit clock si...

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Abstract

This invention discloses a method for transmitting and receiving digital audio signals wirelessly including: converting audio signals to analog signals, converting them to digital audio signals and applying a first radio digital audio T-R circuit supporting synchronous T-R, two-way data exchange and dual track of radio digital audio signals at the transmitting device, applying a second radio digital audio T-R circuit supporting synchronous T-R, two-way data exchange and dual track of radio digital audio signals at the receiving device.

Description

technical field [0001] The invention relates to a method for wirelessly transmitting and receiving digital audio signals and a wireless digital microphone using the method, in particular to a method for wirelessly transmitting and receiving digital audio signals with anti-interference and high sound quality and the wireless digital microphone. Background technique [0002] The traditional wireless microphone is an analog signal microphone, that is, an analog signal is transmitted between the wireless microphone and the receiver. The disadvantages of the wireless analog microphone are as follows: [0003] First of all, since the audio processing process is an analog signal, the signal will affect the audio performance of the system in all aspects of modulation, transmission, transmission, reception and demodulation. The wireless digital microphone transmits digital audio signals between the wireless microphone and the receiver. According to the sampling theorem, the audio sig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/40
Inventor 李昭灿岑良森
Owner 岑良森
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