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Digital circuit structure for converting PDM audio signal into PCM audio signal

An audio signal and digital circuit technology, applied in transducer circuits, signal processing, electrical components, etc., can solve the problem of ineffective acoustic characteristics, and achieve the effect of simple implementation and suppression of out-of-band noise.

Pending Publication Date: 2021-07-20
思澈科技(上海)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These requirements have been difficult to achieve by improving the acoustic characteristics of traditional analog microphones.

Method used

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  • Digital circuit structure for converting PDM audio signal into PCM audio signal
  • Digital circuit structure for converting PDM audio signal into PCM audio signal
  • Digital circuit structure for converting PDM audio signal into PCM audio signal

Examples

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Embodiment 1

[0015] Such as figure 1 Shown, in the digital circuit structure that PDM audio signal provided by the present invention is converted into PCM audio signal, sinc filter (sinc filter) is connected with the single-bit PDM signal that external PDM microphone outputs, and this filter is used for The high-sampling-rate PDM signal is down-sampled and converted into a 24-bit PCM signal, and the effect is to attenuate and filter out-of-band high-frequency signals;

[0016] A compensation filter (compensate filter, comp_fliter for short) filter connected to the sinc filter output of the upper stage is used to compensate for the attenuation of the in-band audio data caused by the sinc filter;

[0017] A high pass filter (high pass filter, referred to as hpf filter) connected to the output of the comp_filter filter of the previous stage is used to filter out the DC component of the 24-bit PCM audio signal;

[0018] A programmable gain amplifier (programmable gainamplifier, referred to as...

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PUM

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Abstract

The invention relates to the technical field of digital signal processing, in particular to a digital circuit structure for converting a PDM audio signal into a PCM audio signal, which comprises a Schinger function filter, a compensation filter, a high-pass filter, a programmable gain amplifier and a low-pass filter which are cascaded, the Suschinger function filter comprises a first integrator, a second integrator, a third integrator, a first downsampling device, a first differentiator, a second differentiator and a third differentiator which are cascaded in sequence; and according to the invention, a 1-bit PDM signal can be converted into a 24-bit PCM signal with a high signal-to-noise ratio, out-of-band noise can be well suppressed, and a filter structure used for realizing the function is relatively simple to realize, so that the implementation of subsequent practical engineering becomes possible.

Description

technical field [0001] The present invention relates to the technical field of digital signal processing, in particular to a digital circuit structure for converting a digital audio pulse density modulation (Pulse Density Modulation, PDM) signal into a pulse code modulation (Pulse Code Modulation, PCM) signal. Background technique [0002] With the development of information technology, the proportion of digital circuits in various electronic systems is increasing, and customers have put forward higher requirements for the input quality of audio signals and the ability to resist various external interferences. These requirements have been difficult to achieve by improving the acoustic characteristics of traditional analog microphones. Compared with analog microphones, digital microphones have stronger anti-interference ability, and do not need built-in high-frequency filter capacitors and filter circuits like traditional microphones. Since the audio signal of the digital mi...

Claims

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Application Information

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IPC IPC(8): H04R3/04H04R3/00
CPCH04R3/00H04R3/04H04R2430/00
Inventor 蔡羽恒车小林李博魏鹏
Owner 思澈科技(上海)有限公司
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