TWI408676B - Audio device and method for appending identification data into audio signals - Google Patents

Abstract

An audio device includes a processor, a storage module, an audio processing module, a silence detection circuit, a condition determining circuit, a direct current (DC) level converting circuit and an appending circuit. The processor generates identification data and control signals. The audio processing module generates original audio signals. The silence detection circuit detects silence periods of the original audio signals, and generates driving signals if detecting the silence periods of the original audio signals. The condition determining circuit determines if the identification data needs to be appended into the silence periods of the original audio signals according to the driving signals and the control signals, and if yes, outputs the identification data in DC signal form. The DC level converting circuit coverts DC voltage level of the identification data in DC signal form, and the appending circuit appends the converted identification data into the silence periods of the original audio signals. A method for appending identification data into audio signals is also provided.

Description

Information device loading method for audio equipment and audio signal

The present invention relates to an audio device, and more particularly to a method for loading an identification information of an audio signal of an audio device.

With the development and wide application of multimedia technology and digital communication, the authentication protection and information security of multimedia works such as images, audio and video works have become an increasingly concerned issue. Usually, when making audio works, such as making a record, the original audio signal is directly output by the digital/analog converter. If there is a problem such as leaking, the source of the leak cannot be traced, causing serious commercial losses.

In view of this, it is necessary to provide an audio device that loads identification information on an audio signal.

In addition, it is necessary to provide a method for loading the identification information of the audio signal.

An audio device includes a processor, a storage module, an audio processing module, a silent segment detecting circuit, a condition determining circuit, a DC level bias circuit, and a loading circuit. The processor is configured to perform a work task of the audio device, generate identification information and a control signal, and the control signal is used to control whether the audio device performs audio The identification information of the signal is loaded. The storage module is used to store the identification information. The audio processing module is used to generate the original audio signal. The silent segment detecting circuit is configured to detect the silent segment of the original audio signal and generate a driving signal when the silent segment of the original audio signal is detected. The condition determining circuit is configured to determine, according to the driving signal and the control signal, whether to load the identification information in the silent segment of the original audio signal, and to load the identification information in the silent segment of the original audio signal, to use the DC signal The form outputs the identification information. The DC level bias circuit is configured to perform DC level offset on the identification information in the form of a DC signal. The loading circuit is configured to load the identification information of the DC level offset into the silent segment of the original audio signal.

Preferably, the identification information includes digital copyright information.

Preferably, the audio device further includes a voltage follower coupled between the audio processing module and the silent segment detecting circuit and between the audio processing module and the loading circuit for isolating the audio processing module And the silent segment detecting circuit and the audio processing module and the loading circuit and buffering the original audio signal.

Preferably, the silent segment detecting circuit comprises a first comparator, a second comparator and a gate. The first comparator includes a first positive input terminal, a first negative input terminal, and a first output terminal, wherein the first negative input terminal receives the original audio signal via a first resistor, and the first positive input terminal receives the first audio input via a second resistor A reference voltage is applied to the ground via a third resistor. The second comparator includes a second positive input terminal, a second negative input terminal, and a second output terminal, wherein the second positive input terminal receives the original audio signal via a fourth resistor, and the second negative input terminal receives the first audio signal via a fifth resistor a second reference voltage and grounded via a sixth resistor, wherein the second reference voltage and the first reference voltage Equal in size and opposite in phase. The gate includes two input terminals and one output terminal, one input terminal is connected to the first output end of the first comparator via a seventh resistor and grounded via an eighth resistor, and the other input terminal is connected to the second comparison via a ninth resistor The second output of the device is grounded via a tenth resistor, and the output of the gate outputs the driving signal.

Preferably, the condition determining circuit comprises a first AND gate and a second gate. The first gate is configured to determine, according to the driving signal and the control signal, whether to load the identification information in the silent segment of the original audio signal, including two input ends and one output end, and one input terminal receives the control signal, and another An input receives the drive signal from the silent segment detecting circuit. The second gate includes two input terminals and one output terminal, one input end of the second AND gate is connected to the output end of the first gate, and the other input terminal of the second gate receives the The identification information is grounded via a twelfth resistor, and the output of the second gate outputs the identification information in the form of the DC signal.

Preferably, the DC level bias circuit comprises a thirteenth resistor and a fourteenth resistor. One end of the thirteenth resistor receives the identification information in the form of the DC signal, and the other end outputs the identification information after the offset of the DC level. One end of the fourteenth resistor is connected to the other end of the thirteenth resistor, and the other end is grounded.

Preferably, the loading circuit includes a differential amplifier including a positive input terminal, a negative input terminal and an output terminal, and the positive input terminal of the differential amplifier receives the identification information of the DC level offset via the fifteenth resistor and Grounded via a sixteenth resistor, the negative input terminal is connected to the output terminal via a seventeenth resistor and receives the original audio signal via the eighteenth resistor, and the output terminal outputs the identifier The audio signal after the information.

An information loading method for an audio signal, for use in an audio device, comprising: generating an original audio signal; detecting a silent segment of the original audio signal and generating a driving signal when detecting the silent segment of the original audio signal; receiving the Driving the signal and receiving the control signal and the identification information from the processor; determining, according to the driving signal and the control signal, whether the identification information is loaded in the silent segment of the original audio signal; if the identifier is loaded in the silent segment of the original audio signal The information is outputted in the form of a DC signal; the identification information in the form of a DC signal is subjected to a DC level offset; and the identification information offset by the DC level is loaded into the silent segment of the original audio signal.

Preferably, the method for loading the identification information of the audio signal further comprises the step of buffering the original audio signal.

Preferably, the driving signal and the control signal determine whether the identification information is loaded in the silent segment of the original audio signal, and if the identification information is loaded in the silent segment of the original audio signal, the output is output in the form of a DC signal. The step of identifying the information includes separately inputting the driving signal and the control signal to the two inputs of the first gate to determine whether the identification information is loaded in the silent segment of the original audio signal; and if the original audio signal is determined The silent segment loads the identification information, outputs the determination result from the output end of the first gate to an input terminal of the second gate, inputs the identification information to the other input of the second gate, and The output end of the second gate outputs the identification information in the form of the DC signal.

The above-mentioned audio device and its audio signal identification information loading method detect the unvoiced segment of the original audio signal, and when determining that the identification information is to be loaded, the identification information is loaded in the silent segment of the original audio signal to be in the audio signal. When leaked, the source of the leak can be traced back by extracting the loaded identification information, ensuring the security of the audio signal and better protecting the audio signal.

10, 20‧‧‧ audio equipment

100‧‧‧ processor

110‧‧‧Audio Processing Module

120‧‧‧Soundless detection circuit

130‧‧‧ Conditional Judgment Circuit

140‧‧‧DC level bias circuit

150‧‧‧Loading circuit

160‧‧‧Voltage follower

170‧‧‧post processing circuit

180‧‧‧ storage module

1200‧‧‧ first comparator

1210‧‧‧Second comparator

1220‧‧‧ and gate

R1~R18‧‧‧first to eighteenth resistors

Vcc‧‧‧ first reference voltage

-Vcc‧‧‧second reference voltage

1300‧‧‧First Gate

1310‧‧‧Second Gate

1500‧‧‧Differential Amplifier

1 is a schematic diagram of an audio device according to an embodiment of the present invention; FIG. 2 is a schematic diagram of an audio device according to another embodiment of the present invention; FIG. 3 is a specific circuit diagram of an audio device according to an embodiment of the present invention; A flow chart of the method for loading the identification information of the audio signal in the embodiment; and FIG. 5 to FIG. 8 are signal comparison diagrams of the circuit simulation of the audio device of the present invention.

1 is a schematic diagram of an audio device 10 in accordance with an embodiment of the present invention. In this embodiment, the audio device 10, such as a set-top box, is used to generate or record an audio signal, and load identification information on the audio signal. When the audio signal is leaked, the source of the leak can be traced by extracting the loaded identification information in the reverse direction. The audio device 10 includes a processor 100, an audio processing module 110, a silent segment detecting circuit 120, a condition determining circuit 130, a DC level bias circuit 140, a loading circuit 150, and a storage module 180. The processor 100 is configured to perform the task of the audio device 10 to generate the identification information and the control signal. The control signal is used to control whether the audio device 10 performs the identification information loading of the audio signal. In this embodiment Wherein, the identification information includes digital copyright information, such as the hardware serial number of the audio device 10, thereby facilitating the tracing of the source of the audio signal leakage. The loaded identification information includes the header information, the digital copyright information and the tail information, for example, 10101010111101000010100101010101, wherein "10101010" is the header information, "1111010000101001" is the digital copyright information, and "01010101" is the tail information. The storage module 180 is configured to store identification information. The audio processing module 110 is configured to generate an original audio signal. In another embodiment of the present invention, the storage module 180 is further configured to store the control signal and the original audio signal.

The silent segment detecting circuit 120 is connected to the audio processing module 110 for detecting the silent segment of the original audio signal and generating a driving signal when the silent segment is detected. In this embodiment, the silent segment detecting circuit 120 detects the silent segment according to the voltage amplitude of the original audio signal, specifically, whether the absolute value of the voltage amplitude of the original audio signal is smaller than the maximum preset of the silent segment. A value, such as 166 mV, is used to detect the silent segment and generate a drive signal when a silent segment is detected. In this embodiment, the driving signal is a logic high level signal, which represents a digital signal 1.

The condition determining circuit 130 is connected to the silent segment detecting circuit 120, the processor 110 and the DC level bias circuit 140 for determining whether the driving signal generated by the silent segment detecting circuit 120 and the control signal generated by the processor 110 are to be The silent segment of the original audio signal loads the identification information, and if the identification information is to be loaded in the silent segment of the original audio signal, the identification information is output in the form of a direct current signal. In this embodiment, the control signal is a logic high/low level signal, and is used to control whether the identification information of the audio signal is loaded. For example, in the control signal When it is a logic high level signal, the control information loading of the audio signal is controlled. When the control signal is a logic low level signal, the control information loading of the audio signal is not controlled.

The DC level bias circuit 140 is configured to perform DC level offset on the identification information in the form of a DC signal output by the condition determination circuit 130. The loading circuit 150 is configured to receive the identification information and the original audio signal after the DC level offset, and load the identification information after the DC level offset into the original audio signal.

2 is a schematic diagram of an audio device 20 in accordance with another embodiment of the present invention. In the present embodiment, the audio device 20 is different from the audio device 10 of FIG. 1 in that the audio device 20 further includes a voltage follower 160 and a subsequent processing circuit 170. The voltage follower 160 is connected between the audio processing module 110 and the silent segment detecting circuit 120 and between the audio processing module 110 and the loading circuit 150 for isolating the audio processing module 110 and the silent segment detecting circuit 120. And isolating the audio processing module 110 and the loading circuit 150 and buffering the original audio signal. Therefore, the signals generated by the silent segment detecting circuit 120 and the loading circuit 150 are not returned to the audio processing module 110, thereby avoiding affecting the original audio signal and ensuring the quality of the original audio signal. The post-processing circuit 170 is configured to process the audio signal after loading the identification information, such as performing recording processing, for output to other devices or playing.

FIG. 3 is a detailed circuit diagram of the audio devices 10 and 20 according to an embodiment of the present invention. In the present embodiment, the silent segment detecting circuit 120 includes a first comparator 1200, a second comparator 1210, and a gate 1220. The first comparator 1200 includes a first positive input terminal, a first negative input terminal, and a first output terminal. The first negative input terminal receives the original from the audio processing module 110 or the voltage follower 160 via the first resistor R1. Starting from the audio signal, the first positive input receives the first reference voltage Vcc via the second resistor R2 and is grounded via the third resistor R3. In this embodiment, the resistance values of the first reference voltage Vcc and the second resistor R2 and the third resistor R3 are related to a maximum preset value of the silent segment of the audio signal, and the relationship is that the first reference voltage Vcc is passed through the second resistor R2. After the third resistor R3 is divided, the voltage on the third resistor R3 is equal to the maximum preset value of the silent segment. For example, the maximum preset value of the silent segment of the audio signal is 166 mV, the first reference voltage Vcc is 3.3 V, the resistance of the second resistor R2 is 27 K ohms, and the resistance of the third resistor R3 is 1 K ohm.

The second comparator 1210 includes a second positive input terminal, a second negative input terminal, and a second output terminal. The second positive input receives the original audio signal from the audio processing module 110 or the voltage follower 160 via the fourth resistor R4. The second negative input receives the second reference voltage -Vcc via the fifth resistor R5 and is grounded via the sixth resistor R6. The second reference voltage -Vcc is equal in magnitude to the first reference voltage Vcc, and the phases are opposite. Similarly, the resistance values of the second reference voltage -Vcc and the fifth resistor R5 and the sixth resistor R6 are related to the maximum preset value of the silent segment, and the relationship is that the second reference voltage -Vcc passes through the fifth resistor R5 and the sixth resistor R6. After partial pressure, the absolute value of the voltage on the sixth resistor R6 is equal to the maximum preset value of the silent segment.

The gate 1220 includes two input terminals and one output terminal, wherein one input terminal is connected to the first output end of the first comparator 1200 via the seventh resistor R7 and is grounded via the eighth resistor R8, and the other input terminal is via the ninth resistor R9. The second output of the second comparator 1210 is connected and grounded via a tenth resistor R10, and the output of the gate 1220 outputs the driving signal. The seventh resistor R7 and the eighth resistor R8 are used to convert the voltage level of the output signal of the first comparator 1200 into a suitable voltage of the gate 1220. The ninth resistor R9 and the tenth resistor R10 are used to convert the voltage level of the output signal of the second comparator 1210 to a suitable voltage level of the gate 1220.

The condition determination circuit 130 includes a first AND gate 1300 and a second AND gate 1310. The first sum gate 1300 and the second sum gate 1310 respectively include two input ends and one output end. The first input of the first gate 1300 receives the control signal from the processor 100 or the storage module 180, and the other input receives the driving signal from the silent segment detecting circuit 120, and is used to determine whether the driver signal and the control signal are to be The silent segment of the original audio signal loads the identification information, and the determination result is output from the output terminal to an input terminal of the second AND gate 1310. In this embodiment, the determination result is a logic high and low level signal. The other input terminal of the second gate 1310 receives the identification information from the processor 100 or the storage module 180 via the eleventh resistor R11 and is grounded via the twelfth resistor R12, and the output terminal outputs the identification information in the form of a direct signal.

The DC level bias circuit 140 includes a thirteenth resistor R13 and a fourteenth resistor R14. One end of the thirteenth resistor R13 receives the identification information in the form of a DC signal from the condition judging circuit 130, and the other end outputs the identification information after the DC level offset. One end of the fourteenth resistor R14 is connected to the other end of the thirteenth resistor R13, and the other end is grounded.

The load circuit 150 includes a differential amplifier 1500 that includes a positive input, a negative input, and an output. The positive input terminal of the differential amplifier 1500 receives the identification information of the DC level offset from the DC level bias circuit 140 via the fifteenth resistor R15, and is grounded via the sixteenth resistor R16. The negative input terminal of the differential amplifier 1500 is connected to its output terminal via a seventeenth resistor R17, and The eighteenth resistor R18 receives the original audio signal from the audio processing module 110 or the voltage follower 160, and the output end outputs an audio signal loaded with the identification information. In the present embodiment, the differential amplifier 1500 has a good noise suppression function, can reduce noise, and output an audio signal with better quality loading information.

In the embodiment, when the audio processing module 110 generates the original audio signal, the original audio signal is input to the silent segment detecting circuit 120. If the voltage amplitude of the original audio signal is greater than the maximum preset value of the silent segment of the audio signal, that is, the original audio signal is not in the silent segment, the voltage of the negative input terminal of the first comparator 1200 is greater than the voltage of the positive input terminal, thus outputting a logic low level. Signal. The positive input terminal voltage of the second comparator 1210 is greater than the negative input terminal voltage, thus outputting a logic high level signal. Therefore, the gate 1220 outputs a logic low level signal, and does not output a driving signal.

If the voltage amplitude of the original audio signal is negative and the absolute value is greater than the maximum preset value of the silent segment of the audio signal, that is, the original audio signal is not in the silent segment, the voltage of the negative input terminal of the first comparator 1200 is less than the voltage of the positive input terminal, thus Output a logic high level signal. The positive input terminal voltage of the second comparator 1210 is less than the negative input terminal voltage, thus outputting a logic low level signal. Therefore, the gate 1220 outputs a logic low level signal, and does not output a driving signal.

When the gate 1220 outputs a logic low level signal, the first and the gates 1300 of the condition determining circuit 130 output a logic low level signal regardless of the control signal, and thus the identification information cannot be loaded.

If the voltage amplitude of the original audio signal is less than the maximum preset of the silent segment of the audio signal The voltage amplitude of the value or the original audio signal is negative and the absolute value is less than the maximum preset value of the silent segment of the audio signal, that is, the original audio signal is in the silent segment, and the voltage of the negative input terminal of the first comparator 1200 is less than the voltage of the positive input terminal. Output a logic high level signal. The positive input terminal voltage of the second comparator 1210 is greater than the negative input terminal voltage, and also outputs a logic high level signal. Therefore, the gate 1220 outputs a logic high level signal, that is, outputs a driving signal.

When the silent segment detecting circuit 120 outputs the driving signal, that is, when the logic high level signal is output, if the control signal is to be controlled to perform the identification information loading, it is high level, and the first and the gate 1300 of the condition determining circuit 130 output logic high. The level signal is the result of the judgment to be loaded. Therefore, the output of the second AND gate 1310 is the identification information of the input high and low levels. Since the voltage level of the identification information in the form of the DC signal outputted by the second gate 1310 is different from the voltage level of the differential amplifier 1500 of the loading circuit 150, the voltage division composed of the thirteenth resistor R13 and the fourteenth resistor R14 is used. The circuit performs level conversion, wherein the resistance of the thirteenth resistor R13 is 20K, and the resistance of the fourteenth resistor is 1K.

FIG. 4 is a flow chart showing a method for loading an identification information of an audio signal according to an embodiment of the present invention. In this embodiment, first, in step S400, the audio processing module 110 generates an original audio signal. In the present embodiment, the voltage follower 160 first buffers the original audio signal to prevent the signal generated by the silent segment detecting circuit 120 and the loading circuit 150 from affecting the original audio signal. In step S410, the silent segment detecting circuit 120 detects the silent segment of the original audio signal and generates a driving signal when the silent segment is detected. In this embodiment, the silent segment detecting circuit 120 detects the silent segment according to the voltage amplitude of the original audio signal, specifically In other words, the first comparator 1200, the second comparator 1210, and the gate 1220 are used to detect whether the absolute value of the voltage amplitude of the original audio signal is smaller than the maximum preset value of the silent segment, for example, 166 mV, to detect the silent segment. .

In step S420, the condition determining circuit 130 receives the driving signal from the silent segment detecting circuit 120, and receives the control signal and the identification information from the processor 100 or the storage module 180. In step S430, the condition determining circuit 130 determines whether the identification information is loaded in the silent segment of the original audio signal based on the driving signal and the control signal. In this embodiment, the control signal is a logic high/low level signal, and is used to control whether the identification information of the audio signal is loaded. For example, when the control signal is a logic high level signal, the control information loading of the audio signal is controlled, and when the control signal is a logic low level signal, the identification information of the audio signal is not loaded. If the condition determining circuit 130 determines that the identification information is not loaded in the silent segment of the original audio signal, the process returns to step S410 to continue detecting the silent segment of the original audio signal.

If the condition determination circuit 130 determines that the identification information is loaded in the silent segment of the original audio signal, the condition determination circuit 130 outputs the identification information in the form of a direct current signal in step S440. In this embodiment, the steps S430 and S440 specifically include: the silent segment detecting circuit 120 and the processor 100 respectively input the driving signal and the control signal to the two inputs of the first gate 1300 of the condition determining circuit 130 to determine whether The identification information is loaded in the silent segment of the original audio signal. If the first gate 1300 determines that the identification information is loaded in the silent segment of the original audio signal, the determination result is output from the output end of the first gate 1300 to an input terminal of the second gate 1310, and the processor 100 inputs the Identification information to the second gate The other input terminal of the 1310 outputs the identification information in the form of the DC signal from the output end of the second gate 1310.

In step S450, the DC level bias circuit 140 DC biases the identification information in the form of a DC signal. In the present embodiment, the voltage level of the identification information in the form of a DC signal output by the second gate 1310 of the condition determination circuit 130 is different from the voltage level of the differential amplifier 1500 of the load circuit 150, and thus the DC level offset The circuit 140 performs level conversion using a voltage dividing circuit composed of a thirteenth resistor R13 and a fourteenth resistor R14.

In step S460, the loading circuit 150 loads the identification information after the DC level offset into the silent segment of the original audio signal. In this embodiment, the DC level bias circuit 140 outputs the identification information of the DC level offset to the positive input end of the differential amplifier 1500, and the audio processing module 110 or the voltage follower 160 outputs the original audio signal to the difference. At the negative input of the amplifier 1500, the differential amplifier 1500 then loads the identification information of the DC level offset into the silent segment of the original audio signal.

5 to 8 show a comparison of circuit analog signals of the audio devices 10 and 20. FIG. 5 is a comparison diagram of the control signal, the identification information, the original audio signal, and the output audio signal (the audio signal outputted by the loading circuit 150) for a long time, and a control signal is taken as a high level and has an identifier. The information and the signal in the silent segment, the signal whose control signal is high and has the information but is in the non-silent segment, and the signal whose control signal is low but has the identification information and is in the silent segment are respectively shown in Figure 6 to Figure 8 magnification and comparative analysis. As can be seen from the figure, the identification information is loaded in the silent segment of the original audio signal, and the identification information is loaded. The subsequent audio signal almost coincides with the audio signal before loading. That is to say, the identification information is loaded in the silent segment of the original audio signal, and the influence on the original audio signal is small, thereby ensuring the quality of the audio signal after the identification information is loaded.

The audio information device 10 and 20 of the present invention and the method for loading the information signal of the audio signal thereof are detected by detecting the silent segment of the original audio signal, and when the identification information is to be loaded, the identifier is immediately loaded in the silent segment of the original audio signal. Information, in the event that the audio signal is leaked, the source of the leak can be traced back by extracting the loaded identification information, ensuring the security of the audio signal and better protecting the audio signal.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art of the present invention should be included in the following claims.

10‧‧‧ audio equipment

100‧‧‧ processor

110‧‧‧Audio Processing Module

120‧‧‧Soundless detection circuit

130‧‧‧ Conditional Judgment Circuit

140‧‧‧DC level bias circuit

150‧‧‧Loading circuit

180‧‧‧ storage module

Claims (10)

An audio device, comprising: a processor, configured to perform a work task of the audio device, and generate identification information and a control signal, wherein the control signal is used to control whether the audio device performs the identification information loading of the audio signal; and the storage module uses And storing the identification information; the audio processing module is configured to generate the original audio signal; the silent segment detecting circuit is configured to detect the silent segment of the original audio signal, and generate when the silent segment of the original audio signal is detected a driving signal; the condition determining circuit is configured to determine, according to the driving signal and the control signal, whether to load the identification information in the silent segment of the original audio signal, and to load the identification information in the silent segment of the original audio signal And outputting the identification information in the form of a DC signal; a DC level bias circuit for performing DC level offset on the identification information in the form of a DC signal; and a loading circuit for biasing the DC level The identification information is loaded into the silent segment of the original audio signal. The improvement of the audio device according to claim 1 is that the identification information includes digital copyright information. The audio device of claim 1, wherein the audio device further comprises a voltage follower coupled between the audio processing module and the silent segment detecting circuit and the audio processing module and the loading Between circuits, used to isolate the audio Processing the module and the silent segment detecting circuit and isolating the audio processing module from the loading circuit and buffering the original audio signal. The audio device of claim 1, wherein the silent segment detecting circuit comprises: a first comparator comprising a first positive input terminal, a first negative input terminal, and a first output terminal, the first Receiving, by the first resistor, the original audio signal, the first positive input receiving the first reference voltage via the second resistor and being grounded via the third resistor; the second comparator comprising the second positive input, the second a negative input terminal and a second output terminal, the second positive input terminal receives the original audio signal via a fourth resistor, the second negative input terminal receives a second reference voltage via a fifth resistor and is grounded via a sixth resistor, wherein the first The second reference voltage is equal in magnitude to the first reference voltage, and the phase is opposite; and the gate includes two input terminals and one output terminal, and one input terminal is connected to the first output end of the first comparator via the seventh resistor and passes through the first The eight-resistor is grounded, the other input is connected to the second output of the second comparator via a ninth resistor and grounded via a tenth resistor, and the output of the gate outputs the drive signal. The audio device of claim 1, wherein the condition determining circuit comprises: a first gate, configured to determine, according to the driving signal and the control signal, whether to be in the silent segment of the original audio signal The identification information includes two input ends and one output end, one input end receives the control signal, the other input end receives the driving signal from the silent segment detecting circuit, and the second input gate includes two input ends With an output, the second and the gate The input terminal is connected to the output end of the first gate, and the other input terminal of the second gate receives the identification information via the eleventh resistor and is grounded via the twelfth resistor, and the output of the second gate outputs the Identification information in the form of a DC signal. The audio device according to claim 1, wherein the DC level biasing circuit comprises: a thirteenth resistor, one end receives the identification information in the form of the DC signal, and the other end outputs the DC level offset. After the identification information; and the fourteenth resistor, one end is connected to the other end of the thirteenth resistor, and the other end is grounded. The audio device according to claim 1, wherein the loading circuit comprises a differential amplifier comprising a positive input terminal, a negative input terminal and an output terminal, and the positive input terminal of the differential amplifier is via a tenth The fifth resistor receives the identification information of the DC level offset and is grounded via a sixteenth resistor. The negative input terminal is connected to the output terminal via a seventeenth resistor and receives the original audio signal via the eighteenth resistor. The output terminal outputs The audio signal after loading the identification information. An information loading method for an audio signal, for use in an audio device, comprising: generating an original audio signal; detecting a silent segment of the original audio signal and generating a driving signal when detecting the silent segment of the original audio signal; receiving Controlling the signal and the identification information; determining whether the identification information is loaded in the silent segment of the original audio signal according to the driving signal and the control signal; If the identification information is loaded in the silent segment of the original audio signal, the identification information is outputted in the form of a DC signal; the identification information in the form of the DC signal is subjected to a DC level offset; and the DC level is offset The identification information is loaded into the silent segment of the original audio signal. The method for loading an identification information of an audio signal according to claim 8 of the patent application, the improvement comprising the step of buffering the original audio signal. The method for loading the identification information of the audio signal according to claim 8 is improved according to whether the driving signal and the control signal determine whether the identification information is loaded in the silent segment of the original audio signal and if The silent segment of the original audio signal is loaded into the identification information, and the step of outputting the identification information in the form of a DC signal includes: respectively inputting the driving signal and the control signal to the two inputs of the first gate to determine whether The silent segment of the original audio signal is loaded with the identification information; and if it is determined that the identification information is loaded in the silent segment of the original audio signal, the determination result is output from the output of the first gate to the second gate The input end inputs the identification information to the other input end of the second gate, and outputs the identification information in the form of the DC signal from the output end of the second gate.