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Audio processing method and circuit in digital psm transmitter

An audio processing and transmitter technology, applied in digital transmission systems, electrical components, modulated carrier systems, etc., to achieve the effects of improving audio processing performance, reducing volume, and enhancing stability

Active Publication Date: 2013-09-04
BEIJING BBEF SCI & TECH
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Problems solved by technology

[0007] The main purpose of the present invention is to overcome the above-mentioned deficiencies in the existing analog circuit psm modulator and its audio processing method, and provide an audio processing method and circuit in a digital psm transmitter. The technical problem to be solved is to make the circuit Simplified structure, improved product reliability and reduced distortion

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  • Audio processing method and circuit in digital psm transmitter
  • Audio processing method and circuit in digital psm transmitter
  • Audio processing method and circuit in digital psm transmitter

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Embodiment Construction

[0039] The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of preferred embodiments with accompanying drawings. Through the description of specific embodiments, one can gain a deeper and more specific understanding of the technical means and effects of the present invention to achieve the intended purpose. However, the accompanying drawings are only for reference and description, and are not used to limit the present invention. .

[0040] see image 3 Shown, audio processing method in the digital psm transmitter of preferred embodiment of the present invention, it mainly comprises the following steps:

[0041] Step 1 performs 2m times AD oversampling on the input audio signal; m in the 2m times AD oversampling is the number of power amplifier modules in the PMS transmitter, which is generally 48, and 2m is 96. That is, 96 times AD oversampling is performed on the input audio...

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Abstract

The invention relates to an audio processing method, in particular to an audio processing method and a circuit in a digital psm transmitter. The method comprises the following steps: 1, performing 2m-fold AD oversampling on an input audio signal; 2, performing n-fold interpolation processing on the AD sampled data; 3, performing digital filtration on the processed signal; 4, processing by using an audio algorithm; and 5, performing corresponding opening, closing and compensation according to a command by an annular modulator. As equal-area compensation is realized by using a software algorithm, the invention greatly reduces the volume of the audio processing circuit and remarkably improves the computing speed so as to realize high-speed processing of audio modulation; moreover, the invention reduces distortion and greatly improves the audio processing performance of the psm transmitter.

Description

technical field [0001] The invention relates to an audio processing method, in particular to an audio processing method and circuit in a digital PSM transmitter. Background technique [0002] Pulse Scale Modulator (psm) is a modulation technology that can effectively improve the modulation efficiency of the transmitter end and expand the transmitter's functions. A pulse-scale modulator is a high-power DC amplifier composed of multiple power amplifier modules connected in series. At present, most of the psm modulators used by domestic radio stations are realized by analog circuits, which mainly include audio processing circuits and ring modulators (such as figure 1 As shown), the audio processing circuit processes the incoming audio signal, controls the ring modulator according to a certain sequence, and controls a certain number of power amplifier modules to conduct according to the amplitude of the audio signal, forming an amplified circuit composed of superimposed DC squa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/04H04L27/00
Inventor 张守忠范继伟
Owner BEIJING BBEF SCI & TECH
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