Test circuit and test method for bluetooth reception sensitivity

Abstract

The application discloses a kind of bluetooth receiving sensitivity test circuit and method.The circuit includes: pre-processing module, modulated wave demodulation module and judging module;Pre-processing module is used to at least the first part of bluetooth test signal is converted into the zero intermediate frequency complex signal of first sampling rate;Wherein, bluetooth test signal is the intermediate frequency complex signal of second sampling rate, first sampling rate is less than second sampling rate;The first part of bluetooth test signal includes empty carrier signal;Modulated wave demodulation module is used to at least to the second part of bluetooth test signal carries out cyclic redundancy check, and the second part of bluetooth test signal includes modulated wave signal;Judging module is used to determine the signal-to-noise ratio of the zero intermediate frequency complex signal of first sampling rate, and according to signal-to-noise ratio and the result of cyclic redundancy check whether bluetooth receiving sensitivity is up to standard is judged.The technical scheme provided by the application can reduce the test time of bluetooth receiving sensitivity, improve the test efficiency of bluetooth sensitivity.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of Bluetooth technology, and in particular to a Bluetooth receiving sensitivity test circuit and test method. BACKGROUND

[0002] Bluetooth receiving sensitivity reflects the strength of the Bluetooth chip's signal receiving capability. Due to the yield problem of chip manufacturing and packaging, the actual sensitivity of some chips is significantly lower than the design index, which will lead to poor connection performance of the chip and affect the user experience. In order to screen out these abnormal sensitivity chips, related receiving performance tests need to be added in the test link of the chip. The current test method transmits a certain number of large data packets to the Bluetooth when testing, and then judges the Bluetooth receiving sensitivity according to the number of data packets received by the Bluetooth. The test takes a long time. SUMMARY

[0003] The present application provides a Bluetooth receiving sensitivity test circuit and test method to reduce the test time of Bluetooth receiving sensitivity and improve the test efficiency of Bluetooth sensitivity.

[0004] According to an aspect of the present application, a Bluetooth receiving sensitivity test circuit is provided, which comprises a preprocessing module, a modulated wave demodulation module and a judgment module.

[0005] The preprocessing module is used to convert at least a first part of the Bluetooth test signal into a zero intermediate frequency complex signal of a first sampling rate; wherein the Bluetooth test signal is an intermediate frequency complex signal of a second sampling rate, and the first sampling rate is less than the second sampling rate; the first part of the Bluetooth test signal includes an empty carrier signal.

[0006] The modulated wave demodulation module is used to perform at least a cyclic redundancy check on a second part of the Bluetooth test signal, and the second part of the Bluetooth test signal includes a modulated wave signal.

[0007] The judgment module is used to determine the signal-to-noise ratio of the zero intermediate frequency complex signal of the first sampling rate, and to determine whether the Bluetooth receiving sensitivity meets the standard according to the signal-to-noise ratio and the result of the cyclic redundancy check.

[0008] Optionally, the Bluetooth test signal includes a first part transmitted within a first preset time period and a second part transmitted within a second preset time period.

[0009] The preprocessing module receives the first part of the Bluetooth test signal in the first preset time period.

[0010] The modulated wave demodulation module receives the second part of the Bluetooth test signal in the second preset time period.

[0011] Optionally, further comprising a switch module, the switch module comprising a first switch unit and a second switch unit;

[0012] The first end of the first switch unit is connected to the Bluetooth test signal, and the second end of the first switch unit is connected to the input end of the preprocessing module; the first switch unit is turned on in the first preset time period and turned off in the second preset time period;

[0013] The first end of the second switch unit is connected to the Bluetooth test signal, and the second end of the second switch unit is connected to the input end of the modulated wave demodulation module; the second switch unit is turned off in the first preset time period and turned on in the second preset time period.

[0014] Optionally, the preprocessing module comprises a frequency down-conversion unit, a complex filter unit, a down-sampling unit and a buffer unit;

[0015] The first end of the frequency down-conversion unit is connected to the second end of the first switch unit, and the second end of the frequency down-conversion unit is connected to the first end of the complex filter unit; the frequency down-conversion unit is used to convert the intermediate frequency complex signal of the second sampling rate into the zero intermediate frequency complex signal of the second sampling rate;

[0016] The second end of the complex filter unit is connected to the first end of the down-sampling unit, and the complex filter unit is used to filter the zero intermediate frequency complex signal of the second sampling rate;

[0017] The second end of the down-sampling unit is connected to the first end of the buffer unit, and the down-sampling unit is used to convert the filtered zero intermediate frequency complex signal of the second sampling rate into the zero intermediate frequency complex signal of the first sampling rate;

[0018] The second end of the buffer unit is connected to the judging module, and the buffer module is used to store the zero intermediate frequency complex signal of the first sampling rate.

[0019] Optionally, the modulated wave demodulation module comprises a modulation and demodulation unit, a baseband processing unit and a CRC detection unit;

[0020] The first end of the modulation and demodulation unit is connected to the second end of the second switch unit, the second end of the modulation and demodulation unit is connected to the first end of the baseband processing unit, and the modulation and demodulation unit is used to obtain the baseband bit stream of the modulated wave signal;

[0021] The second end of the baseband processing unit is connected to the first end of the CRC detection unit, and the baseband processing unit is used to generate a digital data stream to be verified according to the baseband bit stream;

[0022] The first end of the CRC detection unit is connected with the second end of the baseband processing unit, and the second end of the CRC detection unit is connected with the judging module. The CRC detection unit is used for performing cyclic redundancy check on the digital data stream to be verified and transmitting the check result to the judging module.

[0023] Optionally, the judging module is further configured to determine that the Bluetooth receiving sensitivity is up to standard when the signal-to-noise ratio is greater than or equal to a preset demodulation threshold and the cyclic redundancy check result is successful, and determine that the Bluetooth receiving sensitivity is not up to standard when the signal-to-noise ratio is less than the preset demodulation threshold or the cyclic redundancy check result is unsuccessful.

[0024] According to a second aspect of the present application, a method for testing Bluetooth receiving sensitivity is provided. The method comprises: converting at least a first part of the Bluetooth test signal into a zero intermediate frequency complex signal of a first sampling rate; wherein the Bluetooth test signal is an intermediate frequency complex signal of a second sampling rate, and the first sampling rate is less than the second sampling rate; the first part of the Bluetooth test signal comprises an empty carrier signal;

[0025] performing cyclic redundancy check on at least a second part of the Bluetooth test signal, wherein the second part of the Bluetooth test signal comprises a modulated wave signal;

[0026] determining a signal-to-noise ratio of the zero intermediate frequency complex signal of the first sampling rate;

[0027] determining whether the Bluetooth receiving sensitivity is up to standard according to the signal-to-noise ratio and the cyclic redundancy check result.

[0028] Optionally, the conversion of at least the first part of the Bluetooth test signal into the zero intermediate frequency complex signal of the first sampling rate comprises:

[0029] converting the intermediate frequency complex signal of the second sampling rate into a zero intermediate frequency complex signal of the second sampling rate;

[0030] filtering the zero intermediate frequency complex signal of the second sampling rate;

[0031] converting the filtered zero intermediate frequency complex signal of the second sampling rate into the zero intermediate frequency complex signal of the first sampling rate.

[0032] Optionally, the cyclic redundancy check on the second part of the Bluetooth test signal comprises:

[0033] obtaining a baseband bit stream of the modulated wave signal;

[0034] generating a digital data stream to be verified according to the baseband bit stream;

[0035] performing cyclic redundancy check on the digital data stream to be verified.

[0036] Optionally, determining whether the Bluetooth receiving sensitivity is up to standard according to the signal-to-noise ratio and the cyclic redundancy check result comprises: if the signal-to-noise ratio is greater than or equal to a preset demodulation threshold value and the cyclic redundancy check result is successful, determining that the Bluetooth receiving sensitivity is up to standard.

[0037] If the signal-to-noise ratio is less than the preset demodulation threshold value or the cyclic redundancy check result fails, determining that the Bluetooth receiving sensitivity is not up to standard.

[0038] The technical scheme provided by the embodiment of the application converts the first part of the idle carrier signals in the Bluetooth test signal into zero intermediate frequency complex signals of a first sampling rate with lower frequency and lower sampling rate by the preprocessing module, so as to reduce the difficulty of signal processing and shorten the test time; the modulation wave signal in the Bluetooth test signal is demodulated and subjected to cyclic redundancy check by the modulation wave demodulation module, so as to verify the integrity of the data after transmission; then the signal-to-noise ratio of the zero intermediate frequency complex signals of the first sampling rate is analyzed by the judgment module, and then the result of the cyclic redundancy check is combined to determine whether the Bluetooth receiving sensitivity is up to standard, so that the Bluetooth sensitivity is efficiently evaluated in a shorter test time, and the test efficiency of the Bluetooth sensitivity is improved.

[0039] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the application, nor is it used to limit the scope of the application. Other features of the application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0041] Figure 1 A structural schematic diagram of a Bluetooth receiving sensitivity test circuit provided by the embodiment of the application;

[0042] Figure 2 A waveform schematic diagram of a Bluetooth test signal provided by the embodiment of the application;

[0043] Figure 3 A structural schematic diagram of another Bluetooth receiving sensitivity test circuit provided by the embodiment of the application;

[0044] Figure 4 A structural schematic diagram of another Bluetooth receiving sensitivity test circuit provided by the embodiment of the application;

[0045] Figure 5A flowchart of a Bluetooth receiving sensitivity test method provided by an embodiment of the present application is shown in FIG. 1.

[0046] Figure 6 A flowchart of another Bluetooth receiving sensitivity test method provided by an embodiment of the present application is shown in FIG. 2.

[0047] Figure 7 A flowchart of another Bluetooth receiving sensitivity test method provided by an embodiment of the present application is shown in FIG. 3.

[0048] Figure 8 A flowchart of a method for determining whether the Bluetooth receiving sensitivity meets the standard according to the signal-to-noise ratio and the cyclic redundancy check result provided by an embodiment of the present application is shown in FIG. 4. DETAILED DESCRIPTION

[0049] In order to make the personnel in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by the personnel in the art without creative labor should belong to the scope of protection of the present application.

[0050] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[0051] Figure 1 A structural diagram of a Bluetooth receiving sensitivity test circuit provided by an embodiment of the present application is shown in FIG. 5. Figure 1The circuit comprises a preprocessing module 100, a modulated wave demodulation module 200 and a judgment module 300; the preprocessing module 100 is used for converting at least a first part of the Bluetooth test signal into a zero intermediate frequency complex signal of a first sampling rate; wherein the Bluetooth test signal is an intermediate frequency complex signal of a second sampling rate, the first sampling rate is less than the second sampling rate; the first part of the Bluetooth test signal comprises a null carrier signal; the modulated wave demodulation module 200 is used for performing at least a cyclic redundancy check on a second part of the Bluetooth test signal, the second part of the Bluetooth test signal comprises a modulated wave signal; and the judgment module 300 is used for determining a signal-to-noise ratio of the zero intermediate frequency complex signal of the first sampling rate, and judging whether the Bluetooth receiving sensitivity meets the standard according to the signal-to-noise ratio and the result of the cyclic redundancy check.

[0052] Specifically, the Bluetooth test signal can be an intermediate frequency complex signal of a second sampling rate emitted by a signal source 10, containing a real part and an imaginary part, and the Bluetooth test signal can be used for Bluetooth sensitivity verification. The length of the Bluetooth test signal can be one data packet length, and the Bluetooth test signal can be divided into a first part of the Bluetooth test signal and a second part of the Bluetooth test signal in chronological order. The first part of the Bluetooth test signal can be a null carrier signal, and the null carrier signal can be a pure unmodulated sine wave; the second part of the Bluetooth test signal can be a modulated wave signal, and the modulated wave signal can be a carrier wave carrying data information containing data information. The preprocessing module 100 can convert the sampling rate and frequency of the null carrier signal, i.e. convert the intermediate frequency complex signal of the second sampling rate into a zero intermediate frequency signal of the first sampling rate, so as to reduce the difficulty of signal processing and shorten the test time. The modulated wave demodulation module 200 can demodulate the modulated wave signal and perform a cyclic redundancy check to verify the integrity of the data after transmission. The judgment module 300 can be a host computer, which can perform a fast Fourier transform on the zero intermediate frequency complex signal of the first sampling rate converted by the preprocessing module 100, analyze the signal-to-noise ratio of the zero intermediate frequency complex signal of the first sampling rate, and then judge whether the Bluetooth receiving sensitivity of the Bluetooth chip meets the standard in combination with the result of the cyclic redundancy check.

[0053] The technical scheme provided by the embodiment of the application converts the first part of the null carrier signal in the Bluetooth test signal into a zero intermediate frequency complex signal of the first sampling rate with a lower frequency and a lower sampling rate through the preprocessing module, so as to reduce the difficulty of signal processing and shorten the test time; demodulates the modulated wave signal in the Bluetooth test signal and performs a cyclic redundancy check through the modulated wave demodulation module, so as to verify the integrity of the data after transmission; and then analyzes the signal-to-noise ratio of the zero intermediate frequency complex signal of the first sampling rate through the judgment module, and then judges whether the Bluetooth receiving sensitivity meets the standard in combination with the result of the cyclic redundancy check. Compared with the test by multiple data packets, the test method provided by the application can realize efficient evaluation of the Bluetooth sensitivity in a shorter test time, and improve the test efficiency of the Bluetooth sensitivity.

[0054] Optionally, Figure 2 A waveform schematic diagram of a Bluetooth test signal provided by an embodiment of the present application. Based on the above embodiment, refer to Figure 1 and Figure 2 The Bluetooth test signal includes a first part transmitted in a first preset time period and a second part transmitted in a second preset time period; the preprocessing module 100 receives the Bluetooth test signal of the first part in the first preset time period; and the modulated wave demodulation module 200 receives the Bluetooth test signal of the second part in the second preset time period.

[0055] Specifically, the Bluetooth test signal can be divided into a first preset time period of the carrier-free signal and a second preset time period of the modulated wave signal according to the time period. The preprocessing module 100 can convert the carrier-free signal of the Bluetooth test signal in the first preset time period, which can be understood as the preprocessing module 100 converts the intermediate frequency complex signal of the second sampling rate in the first preset time period into the zero intermediate frequency complex signal of the first sampling rate. The modulated wave demodulation module 200 can demodulate the Bluetooth test signal in the second preset time period, which can be understood as the modulated wave demodulation module 200 demodulates the modulated wave signal in the second preset time period and performs cyclic redundancy check. Exemplarily, as shown in Figure 2 The Bluetooth test signal is a complex signal with a sampling rate of 24MHz, including a real part and an imaginary part, and a total duration of 1ms, of which the first 900us is a carrier-free signal and the last 100us is a modulated wave signal. Correspondingly, the first preset time period is 900us and the second preset time period is 100us. The preprocessing module 100 receives the first part of the carrier-free signal in the first preset time period, i.e. the first 900us; and the modulated wave demodulation module 200 receives the second part of the modulated wave signal in the last 100us. It should be noted that the first preset time period can be adjusted according to the sampling rate of the Bluetooth test signal. The lower the sampling rate of the Bluetooth test signal, the longer the first preset time period can be set to ensure the accuracy of the test result; the second preset time period of the Bluetooth test signal with different sampling rates can all be set to 100us. It should be noted that the method provided by the embodiment of the present application can also exchange the processing order of the Bluetooth test signal, i.e. first performing cyclic redundancy check on the second part of the modulated wave signal, and then converting the first part of the carrier-free signal, which can also greatly reduce the test time and ensure the test accuracy compared with the prior art.

[0056] Optionally, Figure 3 Another structural schematic diagram of a Bluetooth receiving sensitivity test circuit provided by an embodiment of the present application. Based on the above embodiment, refer to Figure 2 and Figure 3The test circuit for Bluetooth receiving sensitivity further comprises a switch module 400, which comprises a first switch unit 410 and a second switch unit 420; a first end of the first switch unit 410 is connected to the Bluetooth test signal, and a second end of the first switch unit 410 is connected to an input end of the pre-processing module 100; the first switch unit 410 is turned on in a first preset time period and turned off in a second preset time period; a first end of the second switch unit 420 is connected to the Bluetooth test signal, and a second end of the second switch unit 420 is connected to an input end of the modulated wave demodulation module 200; the second switch unit 420 is turned off in the first preset time period and turned on in the second preset time period.

[0057] Specifically, the switch module 400 can control the on and off states of the first switch unit 410 and the second switch unit 420 through timing, thereby controlling the transmission path of the Bluetooth test signal in different time periods. For example, the Bluetooth test signal is taken as an example. Figure 2 For example, the total length of the complex signal is 1 millisecond, and the sampling rate is 24 MHz. In the first 900 microseconds during the test, the first switch unit 410 is closed and turned on, and the second switch unit 420 is disconnected and turned off, and the Bluetooth test signal is transmitted to the pre-processing module 100; 100 microseconds after the test, the first switch unit 410 is disconnected and turned off, and the second switch unit 420 is closed and turned on, and the signal is transmitted to the modulated wave demodulation module 200. The alternative control mode provided by the present application ensures that the pre-processing module 100 and the modulated wave demodulation module 200 only work in the corresponding data segment, and realizes the low-power design.

[0058] Optionally, Figure 4 Another structure diagram of a test circuit for Bluetooth receiving sensitivity is provided for the embodiment of the present application. Based on the above-mentioned embodiment, the pre-processing module 100 is taken as an example. Figure 2 and Figure 4 The pre-processing module 100 comprises a frequency down-conversion unit 110, a complex filter unit 120, a down-sampling unit 130 and a buffer unit 140; a first end of the frequency down-conversion unit 110 is connected to a second end of the first switch unit 410, and a second end of the frequency down-conversion unit 110 is connected to a first end of the complex filter unit 120; the frequency down-conversion unit 110 is used to convert the intermediate frequency complex signal of the second sampling rate into the zero intermediate frequency complex signal of the second sampling rate; a second end of the complex filter unit 120 is connected to a first end of the down-sampling unit 130, and the complex filter unit 120 is used to filter the zero intermediate frequency complex signal of the second sampling rate; a second end of the down-sampling unit 130 is connected to a first end of the buffer unit 140, and the down-sampling unit 130 is used to convert the filtered zero intermediate frequency complex signal of the second sampling rate into the zero intermediate frequency complex signal of the first sampling rate; a second end of the buffer unit 140 is connected to the judgment module 300, and the buffer module is used to store the zero intermediate frequency complex signal of the first sampling rate.

[0059] Specifically, the down-conversion unit 110, the complex filter unit 120, the down-sampling unit 130 and the buffer unit 140 are connected in series between the signal source 10 and the judgment module 300. The input end of the down-conversion unit 110 can be connected with the second end of the first switch unit 410, receive the intermediate frequency complex signal of the second sampling rate from the signal source 10, and transmit the zero intermediate frequency complex signal of the second sampling rate converted to the complex filter unit 120. The down-conversion unit 110 can be a digital circuit based on the coordinate rotation digital computer algorithm. The input end of the complex filter unit 120 is connected with the output end of the down-conversion unit 110, and the complex filter unit 120 performs low-pass filtering on the zero intermediate frequency complex signal of the second sampling rate and transmits it to the down-sampling unit 130. The complex filter unit 120 can limit high-frequency noise and provide anti-aliasing effect, guarantee signal integrity, and the filtered signal can retain the effective signal within the Bluetooth signal passband, filter out the out-of-band components, so as to prevent aliasing when down-sampling. The input end of the down-sampling unit 130 is connected with the output end of the complex filter unit 120, and the down-sampling unit 130 can down-sample the filtered zero intermediate frequency complex signal of the second sampling rate to generate a zero intermediate frequency complex signal of the first sampling rate and transmit it to the buffer unit 140. The buffer unit 140 can temporarily store the down-sampling result, buffer the data to alleviate the difference in processing speed between the judgment module 300 and the down-sampling unit 130, reduce the interaction frequency with the judgment module 300, improve the data transmission efficiency, and optimize the test throughput.

[0060] Optionally, on the basis of the above-mentioned embodiments, continuing to refer to Figure 4 , the modulated wave demodulation module 200 comprises a modulation and demodulation unit 210, a baseband processing unit 220 and a CRC detection unit 230; the first end of the modulation and demodulation unit 210 is connected with the second end of the second switch unit 420, the second end of the modulation and demodulation unit 210 is connected with the first end of the baseband processing unit 220, and the modulation and demodulation unit 210 is used for obtaining the baseband bit stream of the modulated wave signal; the second end of the baseband processing unit 220 is connected with the first end of the CRC detection unit 230, and the baseband processing unit 220 generates the digital data stream to be verified according to the baseband bit stream; the first end of the CRC detection unit 230 is connected with the second end of the baseband processing unit 220, and the second end of the CRC detection unit 230 is connected with the judgment module 300, and the CRC detection unit 230 is used for performing cyclic redundancy check on the digital data stream to be verified and transmitting the check result to the judgment module 300.

[0061] Specifically, the modulation and demodulation unit 210, the baseband processing unit 220 and the CRC detection unit 230 can be connected in series between the second switch unit 420 and the judgment module 300. The input end of the modulation and demodulation unit 210 can be connected with the second end of the second switch unit 420 to receive the modulated wave data segment of the signal source 10 and perform modulation and demodulation to extract the baseband bit stream. The baseband processing unit 220 can perform synchronization, decoding and data recovery on the baseband bit stream to generate a digital data stream to be verified. The CRC detection unit 230 can perform cyclic redundancy check on the digital data stream, verify the integrity of the Bluetooth receiving channel through error code detection, and output the result to the judgment module 300.

[0062] Optionally, on the basis of the above-mentioned embodiments, continuing to refer to Figure 4 The judgment module 300 is further configured to determine that the Bluetooth receiving sensitivity meets the standard when the signal-to-noise ratio is greater than or equal to the preset demodulation threshold value and the cyclic redundancy check result is successful, and determine that the Bluetooth receiving sensitivity does not meet the standard when the signal-to-noise ratio is less than the preset demodulation threshold value or the cyclic redundancy check result fails.

[0063] Specifically, the preprocessing module 100 verifies the noise coefficient of the radio frequency channel of the chip through signal-to-noise ratio analysis to ensure that the in-band signal-to-noise ratio of the Bluetooth meets the demodulation threshold requirement of the modulated wave demodulation module 200. The modulated wave demodulation module 200 verifies the normal operation of the baseband data processing digital circuit of the Bluetooth low-power modulation and demodulation module through cyclic redundancy check on a single transmission packet. The judgment module 300 can determine that the Bluetooth receiving sensitivity meets the standard when the signal-to-noise ratio of the zero intermediate frequency complex signal at the first sampling rate is greater than or equal to the preset demodulation threshold value and the cyclic redundancy check result is successful. If the signal-to-noise ratio of the zero intermediate frequency complex signal at the first sampling rate is less than the preset demodulation threshold value or the cyclic redundancy check fails, it is determined that the Bluetooth receiving sensitivity does not meet the standard. It can be understood that the signal-to-noise ratio greater than or equal to the preset demodulation threshold value and the cyclic redundancy check passing together constitute the sufficient and necessary conditions for the Bluetooth receiving sensitivity to meet the standard. The preset demodulation threshold value can be 14 dB.

[0064] Figure 5 A flowchart of a Bluetooth receiving sensitivity test method provided by the embodiment of the application is shown in the figure. Referring to Figure 5 The method comprises the following steps:

[0065] S110, at least converting a first part of the Bluetooth test signal into a zero intermediate frequency complex signal at a first sampling rate; wherein the Bluetooth test signal is an intermediate frequency complex signal at a second sampling rate, the first sampling rate is less than the second sampling rate; the first part of the Bluetooth test signal includes an empty carrier signal;

[0066] Specifically, the signal source emits an intermediate frequency complex signal of a second sampling rate. The intermediate frequency complex signal of the second sampling rate can be divided into a first part of the Bluetooth test signal and a second part of the Bluetooth test signal in chronological order. The first part of the Bluetooth test signal can be a null carrier signal, which can be a pure unmodulated sine wave. The pre-processing module can convert the sampling rate and frequency of the null carrier signal, that is, convert the intermediate frequency complex signal of the second sampling rate into a zero intermediate frequency signal of a first sampling rate, to reduce the difficulty of signal processing and shorten the test time.

[0067] S120, at least the second part of the Bluetooth test signal is subjected to cyclic redundancy check, and the second part of the Bluetooth test signal includes a modulated wave signal;

[0068] Specifically, the second part of the Bluetooth test signal can be a modulated wave signal, which can be a carrier wave carrying data information. The modulated wave demodulation module can demodulate the modulated wave signal and perform cyclic redundancy check to verify the integrity of the data after transmission.

[0069] S130, determining the signal-to-noise ratio of the zero intermediate frequency complex signal of the first sampling rate;

[0070] Specifically, the judgment module can perform fast Fourier transform on the zero intermediate frequency complex signal of the first sampling rate converted by the pre-processing module to analyze the signal-to-noise ratio of the zero intermediate frequency complex signal of the first sampling rate.

[0071] S140, determining whether the Bluetooth receiving sensitivity meets the standard according to the signal-to-noise ratio and the cyclic redundancy check result.

[0072] Specifically, the judgment module compares the signal-to-noise ratio with a preset demodulation threshold value to determine whether the Bluetooth receiving sensitivity of the Bluetooth chip meets the standard, and combines the result of the cyclic redundancy check. Optionally, Figure 6 Another flowchart of a method for testing Bluetooth receiving sensitivity is provided in the embodiment of the application. Based on the above-mentioned embodiment, referring to Figure 6 , the method comprises:

[0073] S210, converting the intermediate frequency complex signal of the second sampling rate into a zero intermediate frequency complex signal of the second sampling rate;

[0074] Specifically, the down-conversion unit can be a digital circuit based on a coordinate rotation digital computer algorithm. The down-conversion unit can receive the intermediate frequency complex signal of the second sampling rate from the signal source and convert it into a zero intermediate frequency complex signal of the second sampling rate, which is then transmitted to the complex filter unit. S220, filtering the zero intermediate frequency complex signal of the second sampling rate;

[0075] Specifically, the complex filter unit can perform low-pass filtering on the second sampling rate zero intermediate frequency complex signal and transmit to the downsampling unit. The complex filter unit can limit high-frequency noise and provide anti-aliasing effect, guarantee signal integrity, and the filtered signal can retain the effective signal within the Bluetooth signal passband, filter out the out-of-band components to prevent aliasing when downsampling.

[0076] S230, convert the filtered second sampling rate zero intermediate frequency complex signal into a first sampling rate zero intermediate frequency complex signal.

[0077] Specifically, the downsampling unit can downsample the filtered second sampling rate zero intermediate frequency complex signal, reduce the sampling rate of the second sampling rate zero intermediate frequency complex signal, and generate a first sampling rate zero intermediate frequency complex signal.

[0078] S240, performing cyclic redundancy check on at least a second part of the Bluetooth test signal, the second part of the Bluetooth test signal including a modulated wave signal;

[0079] S250, determining the signal-to-noise ratio of the first sampling rate zero intermediate frequency complex signal;

[0080] S260, determining whether the Bluetooth receiving sensitivity meets the standard according to the signal-to-noise ratio and the cyclic redundancy check result. Optionally, Figure 7 Another flowchart of a Bluetooth receiving sensitivity test method provided by an embodiment of the present application is provided. Based on the above-mentioned embodiment, referring to Figure 7 , the method comprises:

[0081] S310, converting the second sampling rate intermediate frequency complex signal into a second sampling rate zero intermediate frequency complex signal;

[0082] S320, filtering the second sampling rate zero intermediate frequency complex signal;

[0083] S330, converting the filtered second sampling rate zero intermediate frequency complex signal into a first sampling rate zero intermediate frequency complex signal;

[0084] S340, obtaining a baseband bit stream of the modulated wave signal;

[0085] Specifically, the input end of the modulation and demodulation unit receives the modulated wave data segment of the signal source, demodulates the modulated wave signal to extract the baseband bit stream.

[0086] S350, generating a digital data stream to be verified according to the baseband bit stream;

[0087] Specifically, the baseband processing unit can perform synchronization, decoding and data recovery on the baseband bit stream to generate a digital data stream to be verified.

[0088] S360, performing a cyclic redundancy check on the digital data stream to be verified.

[0089] Specifically, the CRC detection unit can perform a cyclic redundancy check on the digital data stream, verify the integrity of the Bluetooth receiving channel through error code detection, and output the result to the judgment module.

[0090] S370, determining the signal-to-noise ratio of the zero intermediate frequency complex signal of the first sampling rate;

[0091] S380, determining whether the Bluetooth receiving sensitivity meets the standard according to the signal-to-noise ratio and the cyclic redundancy check result.

[0092] Optionally, Figure 8 A method flow diagram for determining whether the Bluetooth receiving sensitivity meets the standard according to the signal-to-noise ratio and the cyclic redundancy check result is provided for the embodiments of the present application. Referring to Figure 8 , determining whether the Bluetooth receiving sensitivity meets the standard according to the signal-to-noise ratio and the cyclic redundancy check result, comprising:

[0093] S410, if the signal-to-noise ratio is greater than or equal to the preset demodulation threshold value and the cyclic redundancy check result is successful, determining that the Bluetooth receiving sensitivity meets the standard;

[0094] Specifically, the judgment module can determine that the Bluetooth receiving sensitivity meets the standard when the signal-to-noise ratio of the zero intermediate frequency complex signal of the first sampling rate is greater than or equal to the preset demodulation threshold value, and the cyclic redundancy check result is successful. The signal-to-noise ratio of the zero intermediate frequency complex signal of the first sampling rate greater than or equal to the preset demodulation threshold value can ensure that the Bluetooth in-band signal-to-noise ratio meets the demodulation threshold requirement of the modulation and demodulation module; the successful cyclic redundancy check result can verify that the Bluetooth modulation and demodulation module and the baseband data processing digital circuit can work normally, so that the Bluetooth receiving sensitivity is considered to meet the standard when both meet the standard.

[0095] S420, if the signal-to-noise ratio is less than the preset demodulation threshold value or the cyclic redundancy check result fails, determining that the Bluetooth receiving sensitivity does not meet the standard.

[0096] Specifically, the judgment module can determine that the Bluetooth receiving sensitivity does not meet the standard when the signal-to-noise ratio of the zero intermediate frequency complex signal of the first sampling rate is less than the preset demodulation threshold value or the cyclic redundancy check fails.

[0097] It should be understood that the above-mentioned various forms of flow can be reordered, added or deleted steps. For example, each step described in the present application can be executed in parallel, sequentially or in different order, as long as the desired results of the technical solutions of the present application can be achieved, which is not limited herein.

[0098] The above detailed description does not limit the scope of the application. Various modifications, combinations, sub-combinations and alternatives can be made to the detailed description. Any modification, equivalent replacement and improvement etc. made within the spirit and principle of the application shall be included in the scope of the application.

Claims

1. A test circuit for Bluetooth receiver sensitivity, characterized in that, include: The module consists of a preprocessing module, a modulation / demodulation module, and a judgment module. The Bluetooth test signal includes a first part transmitted within a first preset time period and a second part transmitted within a second preset time period. The preprocessing module is used to convert at least the first portion of the Bluetooth test signal into a zero-IF complex signal with a first sampling rate; wherein the Bluetooth test signal is an IF complex signal with a second sampling rate, and the first sampling rate is less than the second sampling rate; the first portion of the Bluetooth test signal includes a null carrier signal; The modulation demodulation module is used to perform cyclic redundancy check on at least the second part of the Bluetooth test signal, which includes the modulation wave signal. The judgment module is used to determine the signal-to-noise ratio of the zero intermediate frequency complex signal at the first sampling rate, and to determine whether the Bluetooth receiving sensitivity meets the standard based on the signal-to-noise ratio and the result of the cyclic redundancy check. It also includes a switch module, which comprises a first switch unit and a second switch unit; The first terminal of the first switch unit is connected to the Bluetooth test signal, and the second terminal of the first switch unit is connected to the input terminal of the preprocessing module; the first switch unit is turned on during the first preset time period and turned off during the second preset time period. The preprocessing module includes: a down-conversion unit, a complex filtering unit, a downsampling unit, and a buffer unit; The first terminal of the downconversion unit is connected to the second terminal of the first switching unit, and the second terminal of the downconversion unit is connected to the first terminal of the complex filtering unit; the downconversion unit is used to convert the intermediate frequency complex signal of the second sampling rate into a zero intermediate frequency complex signal of the second sampling rate; The second end of the complex filtering unit is connected to the first end of the downsampling unit, and the complex filtering unit is used to filter the zero intermediate frequency complex signal of the second sampling rate; The second end of the downsampling unit is connected to the first end of the buffer unit, and the downsampling unit converts the filtered zero-IF complex signal of the second sampling rate into a zero-IF complex signal of the first sampling rate. The second end of the buffer unit is connected to the judgment module, and the buffer unit is used to store the zero intermediate frequency complex signal of the first sampling rate.

2. The Bluetooth receiver sensitivity test circuit according to claim 1, characterized in that, The preprocessing module receives the first portion of the Bluetooth test signal during the first preset time period; The modulation and demodulation module receives the second part of the Bluetooth test signal during the second preset time period.

3. The Bluetooth receiver sensitivity test circuit according to claim 2, characterized in that, The first end of the second switch unit is connected to the Bluetooth test signal, and the second end of the second switch unit is connected to the input end of the modulation and demodulation module; the second switch unit is turned off during the first preset time period and turned on during the second preset time period.

4. The Bluetooth receiver sensitivity test circuit according to claim 3, characterized in that, The modulation demodulation module includes: a modulation demodulation unit, a baseband processing unit, and a CRC detection unit; The first end of the modulation and demodulation unit is connected to the second end of the second switching unit, and the second end of the modulation and demodulation unit is connected to the first end of the baseband processing unit. The modulation and demodulation unit is used to acquire the baseband bit stream of the modulated wave signal. The second end of the baseband processing unit is connected to the first end of the CRC detection unit, and the baseband processing unit generates a digital data stream to be verified based on the baseband bit stream. The first end of the CRC detection unit is connected to the second end of the baseband processing unit, and the second end of the CRC detection unit is connected to the judgment module. The CRC detection unit is used to perform cyclic redundancy check on the digital data stream to be verified and transmit the check result to the judgment module.

5. The Bluetooth receiver sensitivity test circuit according to claim 1, characterized in that, The judgment module is further configured to determine that the Bluetooth receiving sensitivity meets the standard when the signal-to-noise ratio is greater than or equal to the preset demodulation threshold and the cyclic redundancy check result is successful; and to determine that the Bluetooth receiving sensitivity does not meet the standard when the signal-to-noise ratio is less than the preset demodulation threshold or the cyclic redundancy check result fails.

6. A method for testing Bluetooth receiver sensitivity, applied to the Bluetooth receiver sensitivity testing circuit as described in any one of claims 1-5, characterized in that, include: The Bluetooth test signal in the first part is converted into a zero-IF complex signal with a first sampling rate; wherein the Bluetooth test signal is an IF complex signal with a second sampling rate, and the first sampling rate is less than the second sampling rate; the Bluetooth test signal in the first part includes a null carrier signal; Cyclic redundancy check is performed on at least the second part of the Bluetooth test signal, which includes the modulated wave signal; Determine the signal-to-noise ratio of the zero-IF complex signal at the first sampling rate; The Bluetooth receiver sensitivity is determined based on the signal-to-noise ratio and the cyclic redundancy check result.

7. The method for testing Bluetooth receiver sensitivity according to claim 6, characterized in that, Converting at least the Bluetooth test signal of the first part into a zero-IF complex signal with a first sampling rate includes: The intermediate frequency complex signal at the second sampling rate is converted into a zero intermediate frequency complex signal at the second sampling rate; The zero-IF complex signal at the second sampling rate is filtered; The filtered zero-IF complex signal at the second sampling rate is converted into a zero-IF complex signal at the first sampling rate.

8. The method for testing Bluetooth receiver sensitivity according to claim 7, characterized in that, Cyclic redundancy check is performed on the Bluetooth test signals in the second part, including: Obtain the baseband bit stream of the modulated wave signal; Generate a digital data stream to be verified based on the baseband bit stream; Cyclic redundancy check is performed on the digital data stream to be verified.

9. The method for testing Bluetooth receiver sensitivity according to claim 8, characterized in that, Determining whether the Bluetooth receiving sensitivity meets the standard based on the signal-to-noise ratio and the cyclic redundancy check result includes: if the signal-to-noise ratio is greater than or equal to a preset demodulation threshold and the cyclic redundancy check result is successful, it is determined that the Bluetooth receiving sensitivity meets the standard. If the signal-to-noise ratio is less than the preset demodulation threshold or the cyclic redundancy check fails, the Bluetooth receiving sensitivity is determined to be substandard.

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