Random sequence generating device of anti-recording shielding instrument

Abstract

The utility model belongs to the technical field of recording prevention, and particularly relates to a random sequence generating device of a recording prevention shielding instrument, which comprises a power supply module, a random number generating module, a feedback module and a digital-to-analog conversion module, the power supply module is respectively connected with the random number generation module, the feedback module and the digital-to-analog conversion module; the random number generation module is respectively connected with the feedback module and the digital-to-analog conversion module; the power module is used for supplying power to the device; the random number generation module is used for generating random numbers; the feedback module is used for feeding back the generated random number to the random number generation module; and the digital-to-analog conversion module is used for performing digital-to-analog conversion on the generated random number to obtain a random sequence and outputting the random sequence. According to the utility model, the random number is generated through the random number generation module, and the random number is converted into a signal sequence through the digital-to-analog conversion module for modulating a carrier wave, so that the anti-recording effect is enhanced. And the device is low in cost and easy to popularize.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of anti-recording, and particularly relates to a random sequence generating device of anti-recording shielding instrument. BACKGROUND

[0002] In commercial conferences and important occasions, anti-recording interference shielding instruments are needed to interfere with the recording function of recording devices (such as mobile phones and recording pens) to prevent important information from being leaked. At present, anti-recording interference shielding instruments all use 25KHz or 40KHz ultrasonic waves as interference sources to reduce the signal-to-noise ratio of voice signals. However, the fixed interference source is easily filtered out by recording devices, resulting in poor anti-recording effect. A complex random sequence needs to be used to modulate the carrier wave to enhance the anti-recording effect. However, there is no device specially used for generating random sequences and low in cost. UTILITY MODEL CONTENTS

[0003] The utility model aims at providing a random sequence generating device of anti-recording shielding instrument to fill the gap in the prior art. The specific technical scheme is as follows:

[0004] A random sequence generating device of anti-recording shielding instrument, comprising a power module, a random number generating module, a feedback module and a digital-to-analog conversion module.

[0005] The power module is connected with the random number generating module, the feedback module and the digital-to-analog conversion module respectively.

[0006] The random number generating module is connected with the feedback module and the digital-to-analog conversion module respectively.

[0007] The power module is used for providing power supply for the device.

[0008] The random number generating module is used for generating random numbers.

[0009] The feedback module is used for feeding back the generated random numbers to the random number generating module.

[0010] The digital-to-analog conversion module is used for converting the generated random numbers into random sequences.

[0011] Preferably, the random number generating module comprises an NE555 oscillation circuit and a shift register circuit.

[0012] The NE555 oscillation circuit is connected with the shift register circuit and the digital-to-analog conversion module respectively, and the shift register circuit is connected with the feedback module and the digital-to-analog conversion module respectively.

[0013] Preferably, the NE555 oscillation circuit comprises a CA555T chip, the Vo pin of the CA555T chip is an output pin, the CR pin and the V pin of the CA555T chip are connected with a power supply and one end of a resistor R3 respectively; the other end of the resistor R3 is connected with one end of a resistor R4 and a DIS pin of the CA555T chip respectively; the other end of the resistor R4 is connected with one end of a capacitor C3, a TRIG pin of the CA555T chip and a TRH pin of the CA555T chip respectively; the other end of the capacitor C3, a G pin of the CA555T chip and a CV pin of the CA555T chip are grounded respectively.

[0014] Preferably, the shift register circuit comprises a 74LS164 chip; the CP pin of the 74LS164 chip is connected with the output pin of the NE555 oscillation circuit through a resistor R1; the CP pin of the 74LS164 chip is connected with the output pin of the NE555 oscillation circuit.

[0015] Preferably, the feedback module comprises a first exclusive-OR gate, a second exclusive-OR gate and a NOT gate.

[0016] The first input end of the first exclusive-OR gate is connected with the Q1 pin of the 74LS164 chip, and the second input end is connected with the Q4 pin of the 74LS164 chip;

[0017] The first input end of the second exclusive-OR gate is connected with the output end of the first exclusive-OR gate, and the second input end is connected with the Q7 pin of the 74LS164 chip;

[0018] The input end of the NOT gate is connected with the output end of the second exclusive-OR gate, and the output end is connected with the A pin and the B pin of the 74LS164 chip respectively.

[0019] Preferably, the digital-to-analog conversion module comprises an AD7224 chip, the VDD pin of the AD7224 chip is connected with a power supply, one end of a capacitor C1 and one end of a resistor R2 respectively; the other end of the capacitor C1 is grounded; the other end of the resistor R2 is connected with the RST pin of the AD7224 chip and one end of a capacitor C2 respectively; the other end of the capacitor C2, the LDAC pin, the CS pin, the Vss pin, the AGnd pin and the BGnd pin of the AD7224 chip are grounded respectively;

[0020] The WR pin of the AD7224 chip is connected with the output pin of the NE555 oscillation circuit; the Vref pin of the AD7224 chip is connected with a power supply; the Vo pin of the AD7224 chip is an output pin;

[0021] ​The D0, D1, D2, D3, D4, D5, D6 and D7 pins of the AD7224 chip are respectively connected with the Q0, Q1, Q2, Q3, Q4, Q5, Q6 and Q7 pins of the 74LS164 chip.

[0022] Preferably, the first exclusive-OR gate is a 74LS86 chip.

[0023] Preferably, the second exclusive-OR gate is a 74LS86 chip.

[0024] Preferably, the NOT gate is a 74LS04 chip.

[0025] Compared with the prior art, the anti-recording shielding instrument has the following beneficial effects:

[0026] The random sequence generation device of the anti-recording shielding instrument comprises a power module, a random number generation module, a feedback module and a digital-to-analog conversion module, random numbers are generated through the random number generation module, and the random numbers are converted into signal sequences through the digital-to-analog conversion module, so as to modulate a carrier, thereby being beneficial to enhancing the anti-recording effect. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual proportion.

[0028] Figure 1 is the principle schematic diagram of the present application.

[0029] Figure 2 is the principle diagram of the NE555 oscillation circuit of the present application.

[0030] Figure 3 is the circuit principle diagram of the shift register circuit and the feedback module.

[0031] Figure 4 is the circuit principle diagram of the digital-to-analog conversion module.

[0032] Figure 5 is the schematic diagram of the random sequence generated by the present application. DETAILED DESCRIPTION

[0033] Clearly, the described embodiments are merely a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] In the description of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "top", "bottom", "top surface", "bottom surface", "inner", "outer", "inner side", "outer side" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation of the present application.

[0035] In the description of the present application, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, within, etc. are understood as including the number. If the terms "first", "second", "third" are described, they are only for the purpose of description and distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of indicated technical features.

[0036] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "setting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. The embodiments of the present application will be described below according to the overall structure of the present application.

[0037] As Figure 1As shown, the embodiment provides a random sequence generating device of an anti-recording shielding instrument, which comprises a power module, a random number generating module, a feedback module and a digital-analog conversion module; the power module is connected with the random number generating module, the feedback module and the digital-analog conversion module respectively; the random number generating module is connected with the feedback module and the digital-analog conversion module respectively; the power module is used for providing power supply for the device; the random number generating module is used for generating random numbers; the feedback module is used for feeding back the generated random numbers to the random number generating module; and the digital-analog conversion module is used for converting the generated random numbers into random sequences through digital-analog conversion.

[0038] The utility model discloses a power is generated one 8 -bit data after, one aspect, digital -analog conversion module according to the 8 -bit data output corresponding voltage waveform of generation;On the other hand, 8 -bit data transmission to feedback module, the data after calculation to update the original 8 -bit data.

[0039] The utility model discloses a random number generating module generates random number, and through digital -analog conversion module will random number conversion signal sequence, be used for modulating carrier, be favorable to enhancement anti -recording effect.

[0040] As preferred implementation, the random number generating module includes NE555 oscillation circuit, shift register circuit;NE555 oscillation circuit is connected with shift register circuit, digital -analog conversion module respectively;Shift register circuit is connected with feedback module, digital -analog conversion module respectively. NE555 oscillation circuit generates 1mS square wave signal, provides clock signal for shift register circuit and digital -analog conversion module. Shift register circuit carries out shift operation to 8 -bit data, and the data content in register is updated constantly. Feedback module calculates feedback result according to current data content, and the result is fed back to shift register circuit. Digital -analog conversion module then exports corresponding voltage value according to the 8 -bit data size in shift register.

[0041] As Figure 2 As shown, NE555 oscillation circuit includes CA555T chip, and the Vo pin of CA555T chip is output pin, and the CR pin and the V pin are connected with power supply and one end of resistance R3 respectively;The other end of resistance R3 is connected with one end of resistance R4 and the DIS pin of CA555T chip respectively;The other end of resistance R4 is connected with one end of capacitor C3, the TRIG pin of CA555T chip, the TRH pin of CA555T chip respectively;The other end of capacitor C3, the G pin of CA555T chip, the CV pin of CA555T chip is grounded respectively. The utility model is composed of a bistable circuit by CA555T chip, wherein the capacitor C3 takes 0.1uF, the resistance R3 takes 4.7K, and the resistance R4 takes 10K, so the output period is:

[0042] .

[0043] As shown in Figure 3 , the shift register circuit comprises a 74LS164 chip; a pin of the 74LS164 chip is connected with a power supply through a resistor R1; a CP pin of the 74LS164 chip is connected with an output pin of an NE555 oscillation circuit.

[0044] The feedback module comprises a first exclusive OR gate, a second exclusive OR gate and a NOT gate; a first input end of the first exclusive OR gate is connected with a Q1 pin of the 74LS164 chip, and a second input end thereof is connected with a Q4 pin of the 74LS164 chip; a first input end of the second exclusive OR gate is connected with an output end of the first exclusive OR gate, and a second input end thereof is connected with a Q7 pin of the 74LS164 chip; an input end of the NOT gate is connected with an output end of the second exclusive OR gate, and output ends of the NOT gate are connected with an A pin and a B pin of the 74LS164 chip respectively. Then, the result output by the feedback module is:

[0045] .

[0046] As a preferred embodiment, the first exclusive OR gate is a 74LS86 chip, the second exclusive OR gate is a 74LS86 chip, and the NOT gate is a 74LS04 chip.

[0047] The 74LS164 chip is a right shift register, and the output result of the circuit can be obtained according to the feedback expression of the circuit:

[0048] Table 1 Result of random number generation

[0049]

[0050] As can be seen from Table 1, a random number between 0 and 255 can be obtained.

[0051] As shown in Figure 4 , the digital-to-analog conversion module comprises an AD7224 chip; a VDD pin of the AD7224 chip is connected with a power supply, one end of a capacitor C1 and one end of a resistor R2 respectively; the other end of the capacitor C1 is grounded; the other end of the resistor R2 is connected with a RST pin of the AD7224 chip and one end of a capacitor C2 respectively; the other end of the capacitor C2, an LDAC pin, a CS pin, a Vss pin, an AGnd pin and a BGnd pin of the AD7224 chip are grounded respectively;

[0052] ​​The WR pin of the AD7224 chip is connected with the output pin of the NE555 oscillation circuit; the Vref pin of the AD7224 chip is connected with the power supply; and the Vo pin of the AD7224 chip is used as an output pin;

[0053] The D0, D1, D2, D3, D4, D5, D6 and D7 pins of the AD7224 chip are respectively connected with the Q0, Q1, Q2, Q3, Q4, Q5, Q6 and Q7 pins of the 74LS164 chip in correspondence. The resistor R2 and the capacitor C2 form a reset circuit, which resets the AD7224 chip at the beginning of power-on. The reference voltage of the AD7224 chip is 5V, and the voltage output by the output pin Vo is: The output voltage value is shown in Table 2, and the output random sequence waveform is shown in Figure 5 。

[0054] Table 2: Results of random sequence voltage generation

[0055]

[0056] In summary, the random number generation module generates a random number, and the digital-to-analog conversion module converts the random number into a signal sequence, which is used for modulating the carrier, thereby enhancing the anti-recording effect. Moreover, the utility model has low cost and is easy to popularize.

[0057] The foregoing description of specific exemplary embodiments of the utility model is for the purpose of explanation and illustration, and these descriptions are not intended to limit the utility model to the precise forms disclosed, and it is apparent that many changes and variations can be made according to the above teachings, although an embodiment of the utility model has been shown and described, the specific embodiment is only an explanation of the utility model, and it is not a limitation of the utility model, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable way, the purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the utility model and its practical application, so that those skilled in the art can make modifications, replacements, variations and various different selections and changes to the embodiments according to the needs after reading the specification without departing from the principles and purposes of the utility model, as long as they are within the scope of the claims of the utility model, they are protected by the patent law.

Claims

1. A random sequence generator for a sound-recording shield, characterized in that The power module, the random number generation module, the feedback module and the digital-to-analog conversion module are connected with each other. The power module is connected with the random number generation module, the feedback module and the digital-to-analog conversion module. The random number generation module is connected with the feedback module and the digital-to-analog conversion module. The power module is configured to provide power supply for the device. The random number generation module is configured to generate random numbers. The feedback module is configured to feed back the generated random numbers to the random number generation module. The digital-to-analog conversion module is configured to convert the generated random numbers into random sequences.

2. A random sequence generator for a sound-recording shield according to claim 1, characterized in that The random number generation module comprises an NE555 oscillation circuit and a shift register circuit. The NE555 oscillation circuit is connected with the shift register circuit and the digital-to-analog conversion module, and the shift register circuit is connected with the feedback module and the digital-to-analog conversion module.

3. A random sequence generator for a sound-recording shield according to claim 2, characterized in that The NE555 oscillation circuit comprises a CA555T chip, the Vo pin of the CA555T chip is an output pin, the CR pin and the V pin of the CA555T chip are connected with a power supply and one end of a resistor R3, respectively; the other end of the resistor R3 is connected with one end of a resistor R4 and the DIS pin of the CA555T chip, respectively; the other end of the resistor R4 is connected with one end of a capacitor C3, the TRIG pin and the TRH pin of the CA555T chip, respectively; the other end of the capacitor C3, the G pin and the CV pin of the CA555T chip are grounded, respectively.

4. The random sequence generator of claim 2 wherein, The shift register circuit comprises a 74LS164 chip; the CP pin of the 74LS164 chip is connected with the output pin of an NE555 oscillation circuit. The pin is connected with a power supply through a resistor R1; the CP pin of the 74LS164 chip is connected with the output pin of an NE555 oscillation circuit.

5. A random sequence generator for a sound-recording shield according to claim 4, characterized in that The feedback module comprises a first exclusive OR gate, a second exclusive OR gate and a NOT gate. The first input end of the first exclusive OR gate is connected with the Q1 pin of a 74LS164 chip, and the second input end is connected with the Q4 pin of the 74LS164 chip. The first input end of the second exclusive OR gate is connected with the output end of the first exclusive OR gate, and the second input end is connected with the Q7 pin of the 74LS164 chip. The input end of the NOT gate is connected with the output end of the second exclusive OR gate, and the output end is connected with the A pin and the B pin of the 74LS164 chip, respectively.

6. A random sequence generator for a sound-recording shield according to claim 4, characterized in that The AD7224 chip is connected with the power supply, one end of a capacitor C1 and one end of a resistor R2 through the VDD pin; the other end of the capacitor C1 is grounded; the other end of the resistor R2 is connected with the RST pin of the AD7224 chip and one end of a capacitor C2, respectively; the other end of the capacitor C2, the LDAC pin, the CS pin, the Vss pin, the AGnd pin and the BGnd pin of the AD7224 chip are grounded, respectively. The WR pin of the AD7224 chip is connected with the output pin of the NE555 oscillation circuit; the Vref pin of the AD7224 chip is connected with the power supply; the Vo pin of the AD7224 chip is an output pin. The D0, D1, D2, D3, D4, D5, D6 and D7 pins of the AD7224 chip are connected with the Q0, Q1, Q2, Q3, Q4, Q5, Q6 and Q7 pins of the 74LS164 chip, respectively.

7. A random sequence generator for a sound-recording shield according to claim 5, characterized in that The first exclusive OR gate is a 74LS86 chip.

8. The random sequence generator of claim 5 wherein, The second exclusive OR gate is a 74LS86 chip.

9. The random sequence generator of claim 5 wherein, The non-gate is a 74LS04 chip.

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