WO2016015641A1

WO2016015641A1 - Audio multi-carrier modulation and demodulation apparatus and system

Info

Publication number: WO2016015641A1
Application number: PCT/CN2015/085399
Authority: WO
Inventors: 王根平
Original assignee: 国民技术股份有限公司
Priority date: 2014-07-30
Filing date: 2015-07-29
Publication date: 2016-02-04
Also published as: CN105323013B; CN105323013A

Abstract

Disclosed are an audio multi-carrier modulation and demodulation apparatus and a system. The audio multi-carrier modulation and demodulation apparatus comprises: an audio input module, an audio output module and a main control module, the main control module being connected to the audio input module and the audio output module respectively, wherein the audio input module comprises an analogue input module and at least one path of a demodulation module, the demodulation module comprises an IIR filter module used for completing multi-carrier filtering and filtering out data in a non-frequency band and a PSK demodulation mechanism module used for realising a PSK demodulation mechanism. By means of the method above, the present invention can improve a transmission rate and promote compatibility.

Description

Audio multi-carrier modulation and demodulation device and system

Technical field

The present invention relates to the field of audio multi-carrier modulation and demodulation communication technologies, and in particular, to an audio multi-carrier modulation and demodulation apparatus and system.

Background technique

As wireless audio is used as a channel for data communication, it is increasingly used in peripheral devices of intelligent platforms, such as wireless audio keys, wireless audio card readers, etc., and currently used in single-carrier applications, due to the frequency response characteristics of intelligent terminals. Inconsistent and low frequency result in data modulation using a single carrier, low demodulation compatibility, and slow transmission rate.

Summary of the invention

The invention provides an audio multi-carrier modulation and demodulation device and system, which can realize modulation and demodulation of data multi-carrier, improve transmission rate and improve compatibility.

The invention provides an audio multi-carrier modulation and demodulation device, comprising: an audio input module for inputting, amplifying and demodulating an audio signal; and an audio output module for modulating, converting and outputting the audio signal; The main control module is respectively connected with the audio input module and the audio output module for controlling the audio input module and the audio output module and storing data; wherein the audio input module comprises an analog input module and at least one demodulation module, and an analog input The output end of the module is connected to the input end of the demodulation module, and the output end of the demodulation module is connected to the main control module; wherein the demodulation module includes an IIR filtering module for performing multi-carrier filtering, filtering data in the frequency segment, and The PSK demodulation base module of the PSK demodulation system is implemented. The input end of the IIR filter module is connected to the output end of the analog input module, and the output end of the IIR filter module is connected to the input end of the PSK demodulation base module, and the PSK demodulation base system is implemented. The output of the module is connected to the main control module.

The PSK demodulation base module includes a mixing DDC unit connected in sequence, at least one A 13th order FIR filter unit, at least one downsampling unit, at least one 21st order FIR filter unit, an ATAN angle calculation unit, and a phase difference calculation unit.

The at least one 13th-order FIR filtering unit comprises an I-channel 13-step FIR filtering unit and a Q-channel 13-order FIR filtering unit; the at least one down-sampling unit comprises an I-channel downsampling unit and a Q-channel downsampling unit; and at least one 21-order FIR filtering The unit includes an I-channel 21st-order FIR filter unit and a Q-channel 21-stage FIR filter unit.

Wherein, when the demodulation module is a demodulation module, time division multiplexing is used to complete multi-carrier demodulation; when the demodulation module is a multi-channel demodulation module, multi-channel demodulation is set according to the number of carriers.

The analog input module includes an audio input, a VGA module and an AD module, which are sequentially connected, and an output end of the AD module is connected to an input end of the IIR filter module.

The audio output module includes a connected analog output module and a modulation module, wherein: the modulation module is used to complete modulation of multiple channels of two or more channels, including a SMOOTH module, an NCO module, an Att module, and a Dai connected in sequence. The module, the input end of the SMOOTH module is connected with the output end of the main control module, is used to find the initial phase according to the PSK mode, and performs ramp wave smoothing; the NCO module is used to calculate the sine value of the angle; the Att module is used to complete the gain adjustment. Each carrier has a sinusoidal value and is accumulated; the Dai module is a data register output DAC; the analog output module includes an interconnected audio output and a DA module, and the input of the DA module is connected to the output of the Dai module.

Among them, the audio output is wired audio output, wireless audio output or wired audio and wireless audio selection output.

Among them, the device is an audio key, an audio card reader, an audio payment terminal, an audio-based access control or an identity authentication device.

The present invention also provides an audio multi-carrier modulation and demodulation system, the system comprising at least an audio master device and an audio slave device, an audio master device and an audio slave device through an audio connection, and the audio master device or the audio slave device is the above An audio multi-carrier modulation and demodulation apparatus as described in any one of the preceding claims.

The audio master device and the audio slave device are connected by wired audio or wireless audio, and the audio working range is 20 Hz to 22 kHz.

Through the above scheme, the beneficial effects of the present invention are: the present invention sets the PSK demodulation base The module realizes demodulation and modulation of multi-carrier audio data, improves transmission rate and improves compatibility.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in light of the inventive work. among them:

1 is a schematic structural diagram of an audio multi-carrier modulation and demodulation apparatus according to an embodiment of the present invention;

2 is a schematic structural view of a PSK demodulation base module of FIG. 1;

Figure 3 is a schematic diagram of a plane rectangular coordinate system of the ATAN angle calculating unit of Figure 2;

4 is a schematic structural diagram of an audio multi-carrier modulation and demodulation system according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without departing from the inventive scope are the scope of the present invention.

Referring to FIG. 1, FIG. 1 is a schematic structural diagram of an apparatus for modulating and demodulating an audio multi-carrier according to an embodiment of the present invention. As shown in FIG. 1, the audio multi-carrier modulation and demodulation apparatus 1 disclosed in this embodiment includes: an audio input module 10, a main control module 20, and an audio output module 30; wherein, the main control module 20 and the audio input module respectively 10 is coupled to the audio output module 30 for controlling the audio input module 10 and the audio output module 30 and storing data.

In this embodiment, the audio input module 10 is configured to input, amplify, and demodulate an audio signal, and includes an analog input module 11 and a demodulation module 12, and the demodulation module 12 uses time division multiplexing to complete multiple carriers. demodulation. The output end of the analog input module 11 is connected to the input end of the demodulation module 12, and the output end of the demodulation module 12 is connected to the main control module 20. The analog input module 11 includes an audio input 101, a VGA (Variable Gain Amplifier, VGA for short) module 111 and an AD (Analog to Digital). Analog-to-digital conversion, referred to as AD) module 121 in full, demodulation module 12 includes IIR (Infinite Impulse Response, infinite impulse response, IRR for short) filter module 102 and PSK (Phase Shift Keying), phase shift keying, referred to as the full text The PSK) demodulation base module 103, wherein the output end of the AD module 121 is connected to the input end of the IIR filter module 102, and the output end of the IIR filter module 102 is connected to the input end of the PSK demodulation base module 103, and the PSK demodulation base system The output of the module 103 is connected to the main control module 20. In other embodiments, one of ordinary skill in the art can fully set up at least one demodulation module 12, and set multiple demodulation according to the number of carriers, for example, two demodulation modules 12.

In this embodiment, the audio input 101 is used to input an audio signal, the VGA module 111 is used to amplify the input audio signal, and the AD module 121 is configured to convert the amplified audio signal to convert the audio signal into a digital signal. . The IIR filtering module 102 acquires a digital signal from the AD module 121 for performing multi-carrier filtering and filtering out data in the frequency segment. The PSK demodulation base module 103 acquires the signal processed by the IIR filtering module 102 for use in the audio signal. The PSK demodulation base demodulation, and the demodulated signal is transmitted to the main control module 20, and the main control module 20 obtains the demodulated signal of the PSK demodulation base module 103, and processes and controls the output content of the signal. To the audio output module 30, in addition, the main control module 20 can also control the output signal to the audio output module 30 according to the stored data.

As shown in FIG. 2, the PSK demodulation base module 103 includes a DDC (Digital Down Converter, Digital Down Conversion, DDC for short) unit 113, 13th order FIR (Finite Impulse Response, finite length unit impulse). In response, the entire text is abbreviated as FIR filter unit 123, downsampling unit 133, 21st order FIR filter unit 143, ATAN (inverse tangent, referred to as ATAN for short) angle calculation unit 153 and phase difference calculation unit 163. The 13th order FIR filter unit 123 includes an I channel 13th order FIR filter unit 123a and a Q channel 13th order FIR filter unit 123b. The downsampling unit 133 includes an I channel downsampling unit 133a and a Q way downsampling unit 133b; 21st order FIR filter The unit 143 includes an I-way 21st-order FIR filter unit 143a and a Q-channel 21-stage FIR filter unit 143b. In other embodiments, one of ordinary skill in the art fully sets the PSK demodulation base module 103 to include at least one 13th order FIR filtering unit 123, at least one downsampling unit 133, and at least one 21st order FIR filtering unit 143, such as a PSK solution. The modulating module 103 includes two 13-order FIR filtering units 123, two One downsampling unit 133 and two 21st order FIR filtering units 143.

The mixing DDC unit 113 is connected to the IIR filtering module 102, and the mixing DDC unit 113 is configured to mix the signals processed by the IIR filtering module 102 to generate an I channel signal and a Q channel signal, and the I channel signal passes through the I channel. A 13-step FIR filter unit 123a, an I-channel down-sampling unit 133a, and an I-channel 21-stage FIR filter unit 143a, the Q-channel signal passes through the Q-channel 13-step FIR filter unit 123b, the Q-channel downsampling unit 133b, and the Q-channel 21-stage FIR filter unit. 143b.

Wherein, the I channel downsampling unit 133a and the Q channel downsampling unit 133b are both used to downsample the high sampling rate signal x(n) to the low sampling rate signal y(m), and y(m) passes every x(n). One of the D samples is selected, and D-1 samples are removed. For example: x(n)=[1,2,3,4,3,2,1,], D=2, then y(m)=[1,3,3,1].

In the present embodiment, the signals of the I-channel downsampling unit 133a and the Q-channel downsampling unit 133b are downsampled by the original high sampling rate signals x _i (n) and x _q (n) by D times, and the intermediate interval is D. At the sampling point, the y _i (m) and y _q (m) signals after downsampling can be obtained.

Where x _i (n) is the I channel high sampling rate signal, x _q (n) is the Q channel high sampling rate signal, and y _i (m) is the low sampling rate signal obtained after the D channel is downsampled by the I channel, y _q (m) is the low sampling rate signal obtained after the D channel is downsampled by D, and D is the downsampling factor.

Here, as shown in FIG. 3, the ATAN angle calculation unit 153 acquires the angle θ by the ATAN2(Y, X) formula, where X, Y are X, Y coordinate values in the plane rectangular coordinate system. In addition, the formula for the rotation coordinates (x', y') is:

X'=X*cos(θ)+Y*sin(θ);

y'=-X*sin(θ)+Y*cos(θ);

Wherein, the coordinate values of X and Y are the above coordinate values, sin(θ) is a sine function value of θ angle, and cos(θ) is a cosine function value of θ angle.

The phase difference calculation unit 163 acquires the sequences A1, A2, ..., Am from the ATAN angle calculation unit 153, and the phase difference of the phase difference calculation unit 163 is A(n+1) - A(n).

In this embodiment, the audio output module 30 includes a connected analog output module 31 and a modulation module 32. The modulation module 32 is configured to perform modulation of two channels and more than two channels of multiple carriers, including SMOOTH (smoothing, referred to as SMOOTH for short) Module 302, NCO (numerically controlled oscillator, digitally controlled oscillator, NCO for short) module 312, Att (Attenuator, attenuator, referred to as Att) module 322 and Dai (Direct Access Information, direct access information, full text Referred to as Dai) module 332, the input end of the SMOOTH module 302 is connected to the output end of the main control module 20, the SMOOTH module 302 is used to find the initial phase according to the PSK mode, and performs ramp smoothing; the NCO module 312 is used to complete the sine of the calculated angle. The value of the Att module 322 is used to complete the gain adjustment of each carrier sine value and accumulate; the Dai module 332 is a data register output DAC (Digital to Analog Converter, referred to as DAC in the full text). The analog output module 31 includes an interconnected DA (Digital to Analog, DA) module 301 and an audio output 311. The input of the DA module 301 is connected to the output of the Dai module 332. Preferably, the audio output 311 includes a wired audio output, a wireless audio output, or a wired audio and wireless audio selection output.

The audio multi-carrier modulation and demodulation device 1 can be, for example, an audio key, an audio card reader, an audio payment terminal, an audio-based access control or an identity authentication device.

In this embodiment, the PSK demodulation base module 103 realizes demodulation and modulation of multi-carrier audio data, thereby improving transmission rate and improving compatibility.

Please refer to FIG. 4. FIG. 4 is a schematic structural diagram of an audio multi-carrier modulation and demodulation system according to an embodiment of the present invention. As shown in FIG. 4, the audio multi-carrier modulation and demodulation system 2 disclosed in this embodiment includes at least an audio master device 21 and an audio slave device 22, and an audio master device 21 and an audio slave device 22 are connected by audio. The audio master device 21 or the audio slave device 22 is the audio multi-carrier modulation and demodulation device 1 described in the above embodiment. For example, the audio master device 21 is a smart phone, the audio slave device 22 is an audio key, and the smart phone and the audio key are connected through an audio, and the mobile phone payment is completed through modulation and demodulation of the audio multi-carrier.

Preferably, the audio master device 21 and the audio slave device 22 are connected by wired audio or wireless audio, and the audio working range is 20 Hz to 22 kHz.

In summary, the present invention realizes demodulation and modulation of multi-carrier audio data by setting a PSK demodulation base module, thereby improving transmission rate and improving compatibility.

The above description is only an embodiment of the present invention, and thus does not limit the scope of the invention, and the equivalent structure or equivalent flow transformation made by using the specification and the drawings of the present invention, or Direct or indirect use in other related technical fields is equally included in the scope of patent protection of the present invention.

Claims

An audio multi-carrier modulation and demodulation device, characterized in that the device comprises:

An audio input module for inputting, amplifying, and demodulating an audio signal;

An audio output module for modulating, converting, and outputting an audio signal;

a main control module, wherein the main control module is respectively connected to the audio input module and the audio output module, and is configured to control the audio input module and the audio output module and store data;

The audio input module includes an analog input module and at least one demodulation module, an output end of the analog input module is connected to an input end of the demodulation module, and an output end of the demodulation module is connected to the main control Module

The demodulation module includes an IIR filtering module for performing multi-carrier filtering, filtering data in the frequency segment, and a PSK demodulation base module for implementing a PSK demodulation basis, and an input end of the IIR filtering module An output end of the analog input module is connected, an output end of the IIR filter module is connected to an input end of the PSK demodulation base module, and an output end of the PSK demodulation base module is connected to the main control module.
The apparatus according to claim 1, wherein said PSK demodulation base module comprises a mixing DDC unit connected in sequence, at least one 13-order FIR filtering unit, at least one downsampling unit, and at least one 21-order FIR filter. Unit, ATAN angle calculation unit and phase difference calculation unit.
The apparatus according to claim 2, wherein said at least one 13th order FIR filtering unit comprises an I channel 13th order FIR filtering unit and a Q channel 13th order FIR filtering unit; said at least one downsampling unit comprising an I path down a sampling unit and a Q-channel downsampling unit; the at least one 21st-order FIR filtering unit includes an I-channel 21st-order FIR filtering unit and a Q-channel 21st-order FIR filtering unit.
The apparatus according to claim 1, wherein when the demodulation module is a demodulation module, time division multiplexing is used to perform multi-carrier demodulation; and when the demodulation module is a multi-channel demodulation module Multiple demodulation is set according to the number of carriers.
The device according to claim 1, wherein the analog input module comprises an audio input, a VGA module and an AD module, which are sequentially connected, and an output of the AD module Connected to an input of the IIR filter module.
The apparatus according to claim 1, wherein said audio output module comprises a connected analog output module and a modulation module, wherein:

The modulation module is configured to complete modulation of multiple channels of two or more channels, and includes a SMOOTH module, an NCO module, an Att module, and a Dai module that are sequentially connected, and an input end of the SMOOTH module and the main control module The output terminal is connected to find an initial phase according to the PSK mode and perform ramp wave smoothing; the NCO module is configured to calculate a sine value of the calculated angle; and the Att module is configured to perform gain adjustment on each carrier sine value and accumulate; The Dai module is a data register output DAC;

The analog output module includes an audio output and a DA module connected to each other, and an input end of the DA module is connected to an output of the Dai module.
The apparatus of claim 6 wherein said audio output is a wired audio output, a wireless audio output or a wired audio and wireless audio selection output.
The apparatus of claim 1 wherein said apparatus is an audio key, an audio card reader, an audio payment terminal, an audio based access control or an identity authentication device.
An audio multi-carrier modulation and demodulation system, characterized in that the system comprises at least an audio master device and an audio slave device, the audio master device and the audio slave device are connected by audio, and the audio master The device or the audio slave device is the audio multi-carrier modulation and demodulation device according to any one of claims 1 to 8.
The system of claim 9 wherein said audio master and said audio slave are connected by wired audio or wireless audio, said audio operating range being 20 Hz to 22 kHz.