Audio delay test method, device and system of broadcast system

Abstract

The invention discloses an audio delay test method, device and system for a broadcast system, and the method comprises the steps: generating a delay test signal according to a responded delay test start signal, and transmitting the delay test signal to a networked broadcast system, so as to enable the networked broadcast system to feed back a broadcast test signal; and receiving the broadcast test signal, respectively converting the broadcast test signal and the delay test signal into a broadcast level signal and a test level signal, and calculating and outputting a delay test result according to the broadcast level signal and the test level signal. According to the invention, the generated delay test signal is used as the reference signal for performing the delay test on the broadcast signal output by the broadcast system, so that the delay test error caused by the data transmission process of acquiring the test reference signal from the outside is avoided, and the accuracy of the delay test is improved; the broadcast test signal fed back by the broadcast system is directly acquired, the data transmission time for audio signal acquisition of the broadcast system power amplifier equipment is saved, and the test efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of broadcast testing, and in particular to a method, device and system for testing audio delay of a broadcast system. Background Art

[0002] The audio delay of the broadcasting system and the audio synchronization of different output devices are important indicators for evaluating the quality of the broadcasting system. The audio delay of the broadcasting system refers to the time difference between the output signal and the input signal after the signal source is input to the input device of the broadcasting system, passes through the system transmission processing device, and is then output from the output device of the system. The audio synchronization of different output devices of the broadcasting system refers to the deviation in the time consistency of the audio signals output by different audio output devices when the broadcasting system plays the same audio signal source on different audio output devices. Existing broadcasting systems are generally IP networked broadcasting systems, and in order to ensure network compatibility, the 7-layer OSI model protocol is generally adopted. However, the 7-layer protocol data packet is lengthy and contains a lot of protocol data other than audio data. In addition, since the reliability of existing communication technology takes precedence over real-time performance, the delay problem of existing broadcasting systems is more serious.

[0003] At present, the delay index is generally tested by a combination of instruments such as a signal generator and an oscilloscope. However, the use experience of an analog oscilloscope is not as good as that of a digital oscilloscope, and the waveform of a digital oscilloscope is not easy to lock. Therefore, there are certain disadvantages in using an oscilloscope for delay testing, namely, the instrument is difficult to operate and the test accuracy and efficiency are low. Summary of the invention

[0004] The present invention provides an audio delay test method, device and system for a broadcast system, so as to achieve the technical effect of improving the accuracy of the delay test results and the test efficiency of the broadcast system.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides an audio delay test method of a broadcasting system, comprising the following steps:

[0006] In response to a delay test start signal, a delay test signal is generated, and the delay test signal is sent to the networked broadcast system so that the networked broadcast system feeds back the broadcast test signal;

[0007] receiving the broadcast test signal, and converting the broadcast test signal and the delayed test signal into a broadcast level signal and a test level signal respectively;

[0008] A delay test result is calculated and outputted according to the broadcast level signal and the test level signal.

[0009] The audio delay test method provided by the present invention generates a delay test signal according to the response delay test start signal, and sends it to the networked broadcasting system to be tested, and the broadcasting system receives the delay test signal and feeds back the corresponding broadcast test signal. After receiving the broadcast test signal fed back by the broadcasting system, the broadcast test signal and the generated delay test signal can be subjected to signal conversion processing, that is, the received audio signal is converted into a level pulse signal, which is convenient for the subsequent calculation of the delay test results. The present invention uses the generated delay test signal as a reference signal for delay testing the broadcast signal output by the broadcasting system, avoiding the delay test error caused by the data transmission process of obtaining the test reference signal from the outside, and improving the accuracy of the delay test; directly obtaining the broadcast test signal fed back by the broadcasting system saves the data transmission time generated by the audio signal acquisition of the broadcasting system power amplifier equipment, and improves the test efficiency of the delay test.

[0010] As a preferred example, the converting the broadcast test signal and the delayed test signal into a broadcast level signal and a test level signal respectively comprises:

[0011] The broadcast test signal and the delayed test signal are converted into the broadcast level signal and the test level signal by a preset peak detection algorithm.

[0012] The delay test method provided by the present invention is to perform signal conversion on the broadcast test signal and the delay test signal through the peak detection algorithm, that is, to convert the above two audio signals into a level pulse signal form through the peak detection algorithm, so as to calculate the delay test result, that is, to convert the above two audio signals into a level pulse signal in the form of high and low level pulses through the strong adaptability of the peak detection algorithm, so as to provide a data basis for the subsequent calculation of the time difference between the delay test signal and the broadcast test signal. In addition, since the peak detection algorithm also has anti-interference ability, the conversion of the above two test signals through the peak detection algorithm further improves the accuracy and reliability of the delay detection.

[0013] As a preferred example, the step of calculating and outputting a delay test result according to the broadcast level signal and the test level signal includes:

[0014] Acquire the broadcast pulse rising edge of the broadcast level signal and the test pulse rising edge of the test level signal;

[0015] The rising edge of the test pulse is used as the test start time, and the rising edge of the broadcast pulse is used as the test end time;

[0016] The delay test result is obtained by calculating according to the test start time and the test end time.

[0017] The delay test method provided by the present invention determines the corresponding pulse rising edge through the converted broadcast level signal and test level signal, that is, the pulse rising edges corresponding to the above two level signals are obtained, including the broadcast pulse rising edge and the test pulse rising edge, and the test pulse rising edge is used as the test start time, and the corresponding broadcast pulse rising edge is used as the test end time, and the delay time of the broadcast system, that is, the delay test result, can be further calculated based on the two determined times. When calculating the delay test result, the audio delay test method provided by the present invention only uses the pulse rising edge of the level signal as the delay test time of the level signal, which further improves the accuracy of the calculated delay test result.

[0018] As a preferred example, the audio delay testing method further includes:

[0019] In response to a synchronization test start signal, generating a synchronization test signal, and sending the synchronization test signal to the networked broadcasting system, so that the networked broadcasting system feeds back a plurality of synchronization broadcast signals;

[0020] receiving a plurality of the synchronous broadcast signals, and converting the plurality of the synchronous broadcast signals and the synchronous test signals into a plurality of synchronous broadcast level signals and a synchronous test level signal respectively;

[0021] A synchronization test result is calculated based on a plurality of the synchronization broadcast level signals and the synchronization test level signals.

[0022] In order to test the output synchronization of different audio output devices in a networked broadcasting system, the audio delay test method provided by the present invention can also send a synchronization test signal to the networked broadcasting system to be tested, and after receiving the synchronization test signal, the broadcasting system can feed back and output it through several audio output devices that need to be tested for synchronization. The synchronous broadcast signals output by several different output devices are synchronously collected and acquired to avoid interference between each synchronous broadcast signal when acquiring multiple synchronous broadcast signals, resulting in errors in subsequent synchronization test results and affecting the accuracy of the synchronization test results. The above-mentioned broadcasting system synchronization test method reduces the difficulty of synchronization test operation and simplifies the test process; at the same time, by performing synchronization test processing on several synchronous broadcast signals, the test efficiency of synchronization index testing of multiple audio output devices is improved.

[0023] In addition, when the synchronization index test is performed on several broadcast synchronization signals through the synchronization test signal, the delay test of each broadcast synchronization signal can also be realized synchronously.

[0024] As a preferred example, the step of calculating and outputting a synchronization test result according to the plurality of synchronization broadcast level signals and the synchronization test level signal includes:

[0025] Respectively acquiring a plurality of rising edges of synchronous broadcast pulses of the synchronous broadcast level signals and rising edges of synchronous test pulses of the synchronous test level signals;

[0026] respectively calculating the time deviations between the rising edges of the synchronous test pulse and the rising edges of a plurality of the synchronous broadcast pulses to obtain a plurality of synchronous test sub-results;

[0027] Integrate a plurality of the synchronous test sub-results to obtain and output the synchronous test result.

[0028] After obtaining a number of synchronous broadcast level signals and synchronous test level signals, the synchronous test results of the synchronous broadcast level signals can be calculated by a method similar to the delay test result calculation. Since the synchronization comparison is based on the audio output devices of the two broadcast systems, when calculating the synchronization test results, a number of synchronous test sub-results corresponding to the synchronous broadcast level signals will be calculated first, and then any two of the sub-results will be compared to obtain the delay synchronization test results between the output devices, thereby realizing the delay synchronization index test between the audio output devices of multiple broadcast systems.

[0029] Correspondingly, an embodiment of the present invention further provides an audio delay test method and device for a broadcast system, wherein the audio delay test device comprises a test signal response module, a test signal conversion module and a test result output module; wherein:

[0030] The test signal response module is used to generate a delay test signal in response to the delay test start signal, and send the delay test signal to the networked broadcast system so that the networked broadcast system feeds back the broadcast test signal;

[0031] The test signal conversion module is used to receive the broadcast test signal, and convert the broadcast test signal and the delay test signal into a broadcast level signal and a test level signal respectively;

[0032] The test result output module is used to calculate and output a delay test result according to the broadcast level signal and the test level signal.

[0033] As a preferred example, the test signal conversion module converts the broadcast test signal and the delayed test signal into a broadcast level signal and a test level signal respectively, including:

[0034] The broadcast test signal and the delayed test signal are converted into the broadcast level signal and the test level signal by a preset peak detection algorithm.

[0035] As a preferred example, the test result output module calculates the delay test result according to the broadcast level signal and the test level signal, including:

[0036] Acquire the broadcast pulse rising edge of the broadcast level signal and the test pulse rising edge of the test level signal;

[0037] The rising edge of the test pulse is used as the test start time, and the rising edge of the broadcast pulse is used as the test end time;

[0038] The delay test result is obtained by calculating according to the test start time and the test end time.

[0039] Correspondingly, an embodiment of the present invention further provides an audio delay test system for a broadcast system, the audio delay test system comprising an audio delay test device for a broadcast system and a networked broadcast system as described in any one of the above items; wherein:

[0040] The audio input device of the networked broadcasting system is electrically connected to the test signal output end of the audio delay test device;

[0041] The audio output device of the networked broadcasting system is electrically connected to the test signal input terminal of the audio delay testing device;

[0042] The networked broadcasting system is used to receive the delay test signal or the synchronization test signal output by the audio delay test device, and encapsulate the delay test signal or the synchronization test signal and feed it back to the audio delay test device.

[0043] The networked broadcasting system in the audio delay test system provided by the present invention receives the delay test signal or synchronization test signal output by the audio delay test device through an audio input device, and feeds back the delay test signal or synchronization test signal to the audio delay test device through an audio output device.

[0044] As a preferred example, the audio delay test system includes an audio input device, an audio output device and a network switch; wherein:

[0045] The signal input terminal of the network switch is electrically connected to the audio input device;

[0046] The signal output terminal of the network switch is electrically connected to the audio output device;

[0047] The network switch is used to encapsulate the delay test signal or the synchronization test signal input by the audio input device and transmit it to the audio output device;

[0048] The audio input device is used to receive the delay test signal or the synchronization test signal, and transmit the delay test signal or the synchronization test signal to the network switch;

[0049] The audio output device is used to receive the encapsulated broadcast test signal and the synchronous broadcast signal, and transmit the broadcast test signal and the synchronous broadcast signal to the audio delay test device.

[0050] The ports included in the network switch provided by the present invention do not have specific definitions of input and output ports. Since all ports of a network switch with basic functions have the same functions, only a network switch with management functions may have cascade ports, or some ports may have connection device restrictions. Therefore, the above-mentioned signal input port refers to the port in the network switch that is electrically connected to the audio input device, and the signal output port refers to the port that is electrically connected to the audio output device, that is, the above-mentioned two ports are not particularly limited to a certain port.

[0051] Furthermore, after receiving the delay test signal or the synchronization test signal, the audio input device first performs analog-to-digital conversion on the above two types of analog signals, converts them into digital form, and encapsulates the converted digital form signals to obtain corresponding network data packets and send them to the network switch for processing to obtain corresponding broadcast test signals and synchronous broadcast signals. When the audio output device receives the data packet transmitted by the network switch, it decodes and performs digital-to-analog conversion on it, and outputs the corresponding analog signal to the audio delay test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 : A flow chart of an embodiment of an audio delay test method for a broadcasting system provided by the present invention;

[0053] Figure 2 : A flow chart of an embodiment of a synchronous testing method for an audio delay testing device provided by the present invention;

[0054] Figure 3 : A structural diagram of an embodiment of an audio delay test device for a broadcasting system provided by the present invention;

[0055] Figure 4 : A structural diagram of an embodiment of an audio delay test system for a broadcasting system provided by the present invention;

[0056] Figure 5 : A schematic diagram of an embodiment of the audio delay test device provided by the present invention;

[0057] Figure 6 : A schematic diagram of an embodiment of a delay test signal provided by the present invention;

[0058] Figure 7 : A schematic diagram of an embodiment of a test broadcast signal provided by the present invention;

[0059] Figure 8 : A schematic diagram of an embodiment of a synchronous test broadcast signal provided by the present invention. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] Embodiment 1

[0062] Please refer to Figure 1 , which is a flow chart of an embodiment of the audio delay test method of the broadcasting system provided by the present invention, including steps 101 to 103, each of which is specifically as follows:

[0063] Step 101: In response to a delay test start signal, a delay test signal is generated, and the delay test signal is sent to a networked broadcast system, so that the networked broadcast system feeds back a broadcast test signal.

[0064] The delay test method provided in an embodiment of the present invention will respond to a delay test start signal triggered by a user, generate a delay test signal according to the delay test start signal triggered by the user, and send the generated delay test signal to the networked broadcasting system determined by the user to perform a delay test, so that the networked broadcasting system to be tested transmits and feeds back the received delay test signal, so that a delay test can be subsequently performed on the networked broadcasting system to be tested according to the fed-back broadcast test signal.

[0065] In this embodiment, see Figure 4 , Figure 4 This is a structural diagram of an embodiment of the audio delay test system of the broadcasting system provided by the present invention. Figure 4As shown, the audio delay test system provided in this embodiment generates and outputs a delay test signal or a synchronization test signal to the networked broadcasting system through an audio delay test device, and plays the delay test signal or the synchronization test signal through the networked broadcasting system, and then collects and obtains the broadcast test signal or the broadcast synchronization signal played by the broadcasting system through the audio delay test device, and then by comparing the time difference between the delay test signal or the synchronization test signal generated by the audio delay test device and the collected broadcast test signal or the broadcast synchronization signal, the delay index test or the synchronization index test of the networked broadcasting system can be realized.

[0066] The device uses the delay test signal generated by the audio delay test device as a reference signal for delay testing the broadcast signal output by the broadcast system, thereby improving the accuracy of the delay test; and directly collects the broadcast signal output by the broadcast system through the test signal input end of the audio delay test device, thereby improving the test efficiency of the delay test. The audio delay test device provided by the present invention is simple and clear to operate, and the user can adjust the parameters of the networked broadcast system and the audio delay test device as needed, thereby improving the user experience and reducing the difficulty of operating the audio delay test device.

[0067] In this embodiment, if Figure 4 The dotted line shows the network broadcasting system, and the dotted line shows the audio delay test device. Figure 4 It can be seen that the delay test signal T1 output by the audio delay test device is input into the broadcasting system through the audio input device of the networked broadcasting system, and the test signal T1 is transmitted by the network switch and then output through the audio output device of the broadcasting system. The audio delay test device will also collect and process the test signal T2 output by the audio output device to obtain the delay test result of the broadcasting system. The audio delay test device provided by this embodiment can connect the broadcasting system that needs to be delayed tested to the audio signal loop of the delay test device, so as to realize the delay test of the broadcasting system to be tested, and the broadcasting system can also be replaced to realize the delay test of different broadcasting systems.

[0068] Step 102: Receive the broadcast test signal, and convert the broadcast test signal and the delayed test signal into a broadcast level signal and a test level signal respectively.

[0069] After receiving the broadcast test signal fed back by the networked broadcast system, it can be converted into a high and low pulse level signal of the pulse level mode together with the generated delay test signal, that is, a broadcast level signal and a test level signal, so as to calculate the delay test result later. The generated delay test signal is directly input into the audio delay test device as the test reference signal of the delay test to calculate the delay test result, avoiding the delay test error caused by the data transmission process of obtaining the test reference signal from the outside, and improving the accuracy and reliability of the delay test result.

[0070] Specifically, in this embodiment, converting the broadcast test signal and the delayed test signal into a broadcast level signal and a test level signal respectively includes:

[0071] The broadcast test signal and the delayed test signal are converted into the broadcast level signal and the test level signal by a preset peak detection algorithm.

[0072] The delay test method provided by the embodiment of the present invention is to perform signal conversion on the broadcast test signal and the delay test signal through the peak detection algorithm, that is, to convert the above two audio signals into a level pulse signal form through the peak detection algorithm, so as to calculate the delay test result, that is, to convert the above two audio signals into a level pulse signal in the form of high and low level pulses through the strong adaptability of the peak detection algorithm, so as to provide a data basis for the subsequent calculation of the time difference between the delay test signal and the broadcast test signal. In addition, since the peak detection algorithm also has anti-interference ability, the conversion of the above two test signals through the peak detection algorithm further improves the accuracy and reliability of delay detection.

[0073] Step 103: Calculate and output a delay test result according to the broadcast level signal and the test level signal.

[0074] After completing the signal mode conversion of the generated delay test signal and the received broadcast test signal, the delay test result can be calculated based on the converted broadcast level signal and test level signal, that is, the time deviation value between the two signals is calculated, and the delay index of the networked broadcast system to be tested is determined thereby, thereby achieving accurate testing and evaluation of the delay index of the networked broadcast system.

[0075] In this embodiment, see Figure 5 , Figure 5 The schematic diagram of an embodiment of the audio delay test device provided by the present invention. Figure 5 As shown, the audio delay test device includes a central processing unit, a signal storage device, a touch screen and a host computer; wherein:

[0076] The central processing unit is used to calculate the delay test result according to the delay test signal and the collected test broadcast signal. The delay test device provided by the embodiment of the present invention calculates the delay test result on the collected test broadcast signal and the delay test signal through the central processing unit, thereby improving the accuracy of the delay test result and the calculation efficiency of the delay test result. In addition, the central processing unit provided by this embodiment is preferably an ARM processor, and the device uses the central processing unit as the control core of the delay test device.

[0077] The signal memory is used to store the delay test signal, the test broadcast signal and the delay test result. The signal memory provided in this embodiment can save each test result for subsequent viewing, comparison and analysis by the system. In this embodiment, the signal memory preferably uses a FLASH memory.

[0078] The touch screen is used to display the delay test results and data input function. In order to reduce the difficulty of operating the audio delay test device, the user can Figure 5 The touch screen can be used to view the delay test results of the networked broadcasting system, and the historical test data of the broadcasting system can also be retrieved and viewed through the touch screen. At the same time, the touch screen can also receive various parameter data input by the user and transmit the received parameter data to the central processor for processing.

[0079] The host computer is used to obtain the delay test results, and to perform statistics, display, analysis and storage on the delay test results. The host computer software connected to the audio delay test device manages and analyzes the delay test result data stored in the audio delay test device, thereby improving the statistical efficiency of the delay test results.

[0080] Will Figure 5 The central processor of the audio delay test device shown serves as the control core of the device, the touch display screen serves as the data display and operation interaction function module of the device, the analog signal generates a DA output test signal T1, and at the same time, the analog signal acquisition AD1 of the device will synchronously acquire the output test signal T1 as a test reference signal.

[0081] Figure 5 The analog signal acquisition AD1 shown is an audio signal input acquisition circuit mainly composed of an audio AD conversion chip. The audio signal input acquisition circuit AD1 will collect audio media player, that is, Figure 5 The analog signal shown generates the T1 audio signal played by DA, and uses this as a benchmark for delay comparison calculation. Figure 5The AD2-ADn shown is an audio signal input acquisition circuit mainly composed of a multi-route audio AD conversion chip, which is used to collect the audio signals T2-Tn played by the broadcasting device, that is, the test broadcast signal of this embodiment. In order to facilitate the equipment to perform statistical analysis of test data, the user can selectively connect the PC via USB, and then manage the test data through the host computer software, that is, the host computer of this embodiment.

[0082] Specifically, this embodiment calculates and outputs a delay test result according to the broadcast level signal and the test level signal, including:

[0083] Acquire the broadcast pulse rising edge of the broadcast level signal and the test pulse rising edge of the test level signal;

[0084] The rising edge of the test pulse is used as the test start time, and the rising edge of the broadcast pulse is used as the test end time;

[0085] The delay test result is obtained by calculating according to the test start time and the test end time.

[0086] The delay test method provided by the present invention determines the corresponding pulse rising edge through the converted broadcast level signal and test level signal, that is, the pulse rising edges corresponding to the above two level signals are obtained, including the broadcast pulse rising edge and the test pulse rising edge, and the test pulse rising edge is used as the test start time, and the corresponding broadcast pulse rising edge is used as the test end time, and the delay time of the broadcast system, that is, the delay test result, can be further calculated based on the two determined times. When calculating the delay test result, the audio delay test method provided by the present invention only uses the pulse rising edge of the level signal as the delay test time of the level signal, which further improves the accuracy of the calculated delay test result.

[0087] See Figure 6 , Figure 6 A schematic diagram of an embodiment of a delay test signal provided by the present invention. Figure 5 The test signal shown is the test signal T1 used in this embodiment. The total length of the test signal T1 is 5S, of which 1S has an audio signal and the other 4S have no signal. The frequency of the audio signal is 1K and the amplitude is -10dB.

[0088] In this embodiment, based on Figure 4The audio delay test system shown in the figure needs to connect the test signal output end of the audio delay test device with the audio input device of the networked broadcasting system, and connect the audio signal output device 1 of the networked broadcasting device with the test signal input end of the audio delay test device before starting the test. At the same time, the user can choose whether to connect the audio delay test device with the audio output devices 2-n of the networked broadcasting system, that is, T1 and T2 are required connections, and T3-Tn are optional connections.

[0089] After completing the connection of the above devices, the user can start the test, and after starting, the audio delay test device will output Figure 5 The test signal T1 is sent to the audio input device of the networked broadcasting system, and the audio delay test device will also synchronously obtain the test signal T1 through the analog signal acquisition AD1 in the device as the reference signal for the delay test. After the networked broadcasting system processes the test signal T1 and outputs it through the audio output devices 1-n, the audio delay test device will Figure 2 The analog signals AD2-ADn are shown to acquire corresponding test inputs T2-Tn.

[0090] After obtaining the above test signal, the audio delay test device will process it, specifically: convert the audio envelope into high and low level pulses through the peak detection algorithm, take the start time as the rising edge of the pulse, and take the rising edge of the pulse as the delay test result. Figure 7 The calculation reference data of the delay length ΔT shown in the figure. Therefore, the time when the T1 signal envelope, i.e. the reference signal, is captured is determined as time 0, and the corresponding delay length ΔT = T2-T1 or ΔT = Tn-T1. In this embodiment, the falling edge of the signal envelope is not used for testing. For details, see Figure 7 , Figure 7 A schematic diagram of an embodiment of a test broadcast signal provided by the present invention.

[0091] In order to further improve the accuracy and reliability of the test, you can choose to perform a single test or multiple tests. Among them, a single test is that the audio player of the audio delay test device plays once, the corresponding AD1-ADn is collected once, and then the central processor or PC end, i.e., the host computer software, calculates the delay time as the test result. Multiple tests are repeated playback of the audio player, such as Figure 6 The audio signal T1 is shown, and AD1-ADn are correspondingly collected multiple times, preferably repeated 5 times, and after calculating and obtaining multiple test results, the average data of multiple times is used as the test result.

[0092] In addition, see Figure 2 , Figure 2 A flow chart of an embodiment of a synchronous testing method for an audio delay testing device provided by the present invention. Figure 2 As shown, the synchronization test method includes steps 201 to 203, and each step is specifically as follows:

[0093] Step 201: generating a synchronous test signal in response to a synchronous test start signal, and sending the synchronous test signal to the networked broadcasting system, so that the networked broadcasting system feeds back a plurality of synchronous broadcast signals;

[0094] Step 202: receiving a plurality of the synchronous broadcast signals, and converting the plurality of the synchronous broadcast signals and the synchronous test signals into a plurality of synchronous broadcast level signals and a synchronous test level signal respectively;

[0095] Step 203: Calculate and obtain a synchronization test result according to a plurality of the synchronization broadcast level signals and the synchronization test level signals.

[0096] In order to test the output synchronization of different audio output devices in a networked broadcasting system, the audio delay test method provided by the present invention can also send a synchronization test signal to the networked broadcasting system to be tested, and after receiving the synchronization test signal, the broadcasting system can feed back and output it through several audio output devices that need to be tested for synchronization. The synchronous broadcast signals output by several different output devices are synchronously collected and acquired to avoid interference between each synchronous broadcast signal when acquiring multiple synchronous broadcast signals, resulting in errors in subsequent synchronization test results and affecting the accuracy of the synchronization test results. The above-mentioned broadcasting system synchronization test method reduces the difficulty of synchronization test operation and simplifies the test process; at the same time, by performing synchronization test processing on several synchronous broadcast signals, the test efficiency of synchronization index testing of multiple audio output devices is improved.

[0097] In addition, when the synchronization index test is performed on several broadcast synchronization signals through the synchronization test signal, the delay test of each broadcast synchronization signal can also be realized synchronously.

[0098] Furthermore, this embodiment calculates and outputs a synchronization test result according to the plurality of synchronization broadcast level signals and the synchronization test level signal, including:

[0099] Respectively acquiring a plurality of rising edges of synchronous broadcast pulses of the synchronous broadcast level signals and rising edges of synchronous test pulses of the synchronous test level signals;

[0100] respectively calculating the time deviations between the rising edges of the synchronous test pulse and the rising edges of a plurality of the synchronous broadcast pulses to obtain a plurality of synchronous test sub-results;

[0101] Integrate a plurality of the synchronous test sub-results to obtain and output the synchronous test result.

[0102] After obtaining a number of synchronous broadcast level signals and synchronous test level signals, the synchronous test results of the synchronous broadcast level signals can be calculated by a method similar to the delay test result calculation. Since the synchronization comparison is based on the audio output devices of the two broadcast systems, when calculating the synchronization test results, a number of synchronous test sub-results corresponding to the synchronous broadcast level signals will be calculated first, and then any two of the sub-results will be compared to obtain the delay synchronization test results between the output devices, thereby realizing the delay synchronization index test between the audio output devices of multiple broadcast systems.

[0103] In order to test the output synchronization of different audio output devices in a networked broadcasting system, the audio delay test device provided by the present invention can also send a synchronization test signal to the broadcasting system. After receiving the synchronization test signal, the broadcasting system will process it accordingly and play it through different audio output devices. The audio delay test device will obtain the synchronization test broadcast signals output by different output devices through the test signal input terminals connected to different audio output devices, and perform output device synchronization index calculation test of the broadcasting system on the obtained synchronization test broadcast signals.

[0104] The above-mentioned broadcast system synchronization test method reduces the difficulty of operating the test device and simplifies the test process; by synchronizing audio input to multiple different audio output devices, the accuracy of the synchronization test results and the test efficiency are also improved. In addition, the delay index and synchronization index of the broadcast system are tested by the same device, which also improves the convenience of the test and the cost-effectiveness of the test device.

[0105] In this embodiment, based on Figure 4 The audio delay test system shown in the figure needs to be completed as follows before starting the test: Figure 4 When the device needs to be tested synchronously, two or more test signals need to be connected to T2-Tn. Figure 2 As shown, there is a connection relationship between AD3 and ADn, which is a mandatory connection.

[0106] After completing the above connection, the test process is the same as the test process of the above delay test. Since the synchronization test of the device is a synchronization test between different audio output devices of the broadcasting system, the difference between the synchronization test and the delay test is that when the delay test device obtains the corresponding test signal from AD1-ADn to calculate the synchronization test result, the reference signal it refers to is not the T1 signal obtained by AD1.

[0107] In the synchronization test, the device will no longer set a reference signal, but will calculate the synchronization time deviation ΔT for all received signals, that is, the synchronization time deviation ΔT needs to be calculated between every two signals. Therefore, if the delay test device obtains n synchronization test broadcast signals, the device needs to perform For details on sub-synchronization time deviation ΔT calculation, see Figure 8 , Figure 8 The schematic diagram of an embodiment of the synchronous test broadcast signal provided by the present invention is shown in FIG. The above calculation process is implemented by the central processor of the device, and in order to improve the accuracy and reliability of the synchronization test result, the above test process can also perform a single test or multiple tests.

[0108] The test data obtained from the above two tests, including the delay test and the synchronization test, can be classified and labeled and stored in the device database, or transmitted to the PC end, i.e., the host computer described in this embodiment, via USB connection for statistical analysis, so as to achieve data traceability of the test device.

[0109] In addition, the networked broadcasting system provided in this embodiment includes a power amplifier device and a networked broadcasting server; wherein:

[0110] The power amplifier device is used to receive the test broadcast signal output by the audio output device, and perform power amplification and output processing on the test broadcast signal. The power amplifier device can realize power amplification and output processing on the test broadcast signal output by the audio output device.

[0111] The networked broadcast server is used to manage the broadcast system itself and all input devices, output devices, control devices, etc. that are connected to the broadcast system itself through a network.

[0112] Users can monitor and obtain the operating data of the broadcast system in real time through the broadcast server. They can also store and manage the acquired operating data to facilitate subsequent tracing of abnormal signals.

[0113] At the same time, the broadcast system operation data stored in the broadcast server can be used to realize real-time monitoring of the broadcast system operation status. When abnormal problems occur in the system, the broadcast system can be troubleshooted through the stored operation data, thereby improving the troubleshooting efficiency of the broadcast system.

[0114] In order to better illustrate the working principle and step flow of the audio delay test method, device and system of the broadcasting system of the present invention, it is possible but not limited to refer to the relevant records above.

[0115] Accordingly, see Figure 3 , Figure 3 The structure diagram of an embodiment of the audio delay test device of the broadcasting system provided by the present invention is as follows. Figure 3 As shown, the audio delay test device includes a test signal response module 301, a test signal conversion module 302 and a test result output module 303; wherein:

[0116] The test signal response module 301 is used to generate a delay test signal in response to a delay test start signal, and send the delay test signal to the networked broadcast system so that the networked broadcast system feeds back the broadcast test signal.

[0117] Furthermore, the test signal response module 301 is also used to generate a synchronous test signal in response to a synchronous test start signal, and send the synchronous test signal to the networked broadcasting system, so that the networked broadcasting system feeds back a number of synchronous broadcast signals.

[0118] The test signal conversion module 302 is used to receive the broadcast test signal, and convert the broadcast test signal and the delayed test signal into a broadcast level signal and a test level signal respectively.

[0119] Furthermore, the test signal conversion module 302 is further configured to receive a plurality of the synchronous broadcast signals, and convert the plurality of the synchronous broadcast signals and the synchronous test signals into a plurality of synchronous broadcast level signals and a synchronous test level signal respectively.

[0120] Furthermore, the test signal conversion module 302 converts the broadcast test signal and the delayed test signal into a broadcast level signal and a test level signal respectively, including:

[0121] The broadcast test signal and the delayed test signal are converted into the broadcast level signal and the test level signal by a preset peak detection algorithm.

[0122] The test result output module 303 is used to calculate and output a delay test result according to the broadcast level signal and the test level signal.

[0123] Furthermore, the test result output module 303 is further configured to calculate a synchronization test result according to a plurality of the synchronization broadcast level signals and the synchronization test level signals.

[0124] Furthermore, the test result output module 303 calculates the delay test result according to the broadcast level signal and the test level signal, including:

[0125] Acquire the rising edge of the broadcast pulse of the broadcast level signal and the rising edge of the test pulse of the test level signal; use the rising edge of the test pulse as the test start time and the rising edge of the broadcast pulse as the test end time; and calculate the delay test result according to the test start time and the test end time.

[0126] Furthermore, the test result output module 303 calculates and outputs a synchronization test result according to the plurality of synchronization broadcast level signals and the synchronization test level signal, including:

[0127] Respectively obtain a number of rising edges of the synchronous broadcast pulses of the synchronous broadcast level signals and a number of rising edges of the synchronous test pulses of the synchronous test level signals; respectively calculate the time deviations between the rising edges of the synchronous test pulses and a number of rising edges of the synchronous broadcast pulses to obtain a number of synchronous test sub-results; integrate the several synchronous test sub-results to obtain and output the synchronous test result.

[0128] Correspondingly, an embodiment of the present invention further provides an audio delay test system for a broadcast system, the audio delay test system comprising an audio delay test device for a broadcast system and a networked broadcast system as described in any one of the above items; wherein:

[0129] The audio input device of the networked broadcasting system is electrically connected to the test signal output end of the audio delay test device;

[0130] The audio output device of the networked broadcasting system is electrically connected to the test signal input terminal of the audio delay testing device;

[0131] The networked broadcasting system is used to receive the delay test signal or the synchronization test signal output by the audio delay test device, and encapsulate the delay test signal or the synchronization test signal and feed it back to the audio delay test device.

[0132] The networked broadcasting system in the audio delay test system provided in the embodiment of the present invention receives the delay test signal or synchronization test signal output by the audio delay test device through an audio input device, and feeds back the delay test signal or synchronization test signal to the audio delay test device through an audio output device.

[0133] As a preferred example, the audio delay test system includes an audio input device, an audio output device and a network switch; wherein:

[0134] The signal input terminal of the network switch is electrically connected to the audio input device;

[0135] The signal output terminal of the network switch is electrically connected to the audio output device;

[0136] The network switch is used to encapsulate the delay test signal or the synchronization test signal input by the audio input device and transmit it to the audio output device;

[0137] The audio input device is used to receive the delay test signal or the synchronization test signal, and transmit the delay test signal or the synchronization test signal to the network switch;

[0138] The audio output device is used to receive the encapsulated broadcast test signal and the synchronous broadcast signal, and transmit the broadcast test signal and the synchronous broadcast signal to the audio delay test device.

[0139] The various ports included in the network switch provided in the embodiment of the present invention do not have specific definitions of input and output ports. Since all ports of a network switch with basic functions have the same functions, only a network switch with management functions may have cascade ports, or some ports may have connection device restrictions. Therefore, the above-mentioned signal input port refers to the port in the network switch that is electrically connected to the audio input device, and the signal output port refers to the port that is electrically connected to the audio output device, that is, the above-mentioned two ports are not specifically limited to a certain port.

[0140] Furthermore, after receiving the delay test signal or the synchronization test signal, the audio input device first performs analog-to-digital conversion on the above two types of analog signals, converts them into digital form, and encapsulates the converted digital form signals to obtain corresponding network data packets and send them to the network switch for processing to obtain corresponding broadcast test signals and synchronous broadcast signals. When the audio output device receives the data packet transmitted by the network switch, it decodes and performs digital-to-analog conversion on it, and outputs the corresponding analog signal to the audio delay test device.

[0141] In summary, the embodiment of the present invention provides an audio delay test method and device for a broadcast system, which generates a delay test signal according to a delay test start signal in response, and sends the delay test signal to a networked broadcast system so that the networked broadcast system can feed back a broadcast test signal; receives a broadcast test signal, and converts the broadcast test signal and the delay test signal into a broadcast level signal and a test level signal respectively, and calculates and outputs a delay test result according to the broadcast level signal and the test level signal. The present invention uses the generated delay test signal as a reference signal for delay testing the broadcast signal output by the broadcast system.

[0142] The delay test error caused by the data transmission process of obtaining the test reference signal from the outside is avoided, thereby improving the accuracy of the delay test; the broadcast test signal fed back by the broadcast system is directly obtained, which saves the data transmission time for audio signal collection from the broadcast system power amplifier equipment and improves the test efficiency.

[0143] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for testing audio delay in a broadcasting system, characterized in that: The following steps are involved: In response to a delay test start signal, a delay test signal is generated, and the delay test signal is sent to a networked broadcast system so that the networked broadcast system feeds back a broadcast test signal; receiving the broadcast test signal, and converting the broadcast test signal and the delayed test signal into a broadcast level signal and a test level signal; The delay test result is calculated and outputted according to the broadcast level signal and the test level signal.

2. The audio delay test method of a broadcasting system as claimed in claim 1, characterized in that: The converting the broadcast test signal and the delayed test signal into a broadcast level signal and a test level signal comprises: The broadcast test signal and the delayed test signal are converted into the broadcast level signal and the test level signal by a preset peak detection algorithm.

3. The audio delay test method of a broadcasting system as claimed in claim 1, characterized in that: The step of calculating and outputting a delay test result according to the broadcast level signal and the test level signal comprises: Acquire the broadcast pulse rising edge of the broadcast level signal and the test pulse rising edge of the test level signal; The rising edge of the test pulse is used as the test start time, and the rising edge of the broadcast pulse is used as the test end time; The delay test result is obtained by calculating according to the test start time and the test end time.

4. The audio delay test method of a broadcasting system as claimed in claim 1, characterized in that: Also includes: In response to a synchronization test start signal, generating a synchronization test signal, and sending the synchronization test signal to the networked broadcasting system, so that the networked broadcasting system feeds back a plurality of synchronization broadcast signals; receiving a plurality of the synchronous broadcast signals, and converting the plurality of the synchronous broadcast signals and the synchronous test signals into a plurality of synchronous broadcast level signals and a synchronous test level signal; A synchronization test result is calculated and outputted according to a plurality of the synchronization broadcast level signals and the synchronization test level signals.

5. The audio delay test method of a broadcasting system as claimed in claim 4, characterized in that: The calculating and outputting the synchronization test result according to the plurality of synchronization broadcast level signals and the synchronization test level signal comprises: Respectively acquiring a plurality of rising edges of synchronous broadcast pulses of the synchronous broadcast level signals and rising edges of synchronous test pulses of the synchronous test level signals; respectively calculating the time deviations between the rising edges of the synchronous test pulse and the rising edges of a plurality of the synchronous broadcast pulses to obtain a plurality of synchronous test sub-results; A plurality of the synchronous test sub-results are integrated to obtain the synchronous test result.

6. An audio delay test device for a broadcasting system, characterized in that: The audio delay test device comprises a test signal response module, a test signal conversion module and a test result output module; wherein: The test signal response module is used to generate a delay test signal in response to the delay test start signal, and send the delay test signal to the networked broadcast system so that the networked broadcast system feeds back the broadcast test signal; The test signal conversion module is used to receive the broadcast test signal, and convert the broadcast test signal and the delay test signal into a broadcast level signal and a test level signal; The test result output module is used to calculate and output the delay test result according to the broadcast level signal and the test level signal.

7. The audio delay test device of a broadcasting system as claimed in claim 6, characterized in that: The test signal conversion module converts the broadcast test signal and the delay test signal into a broadcast level signal and a test level signal, including: The broadcast test signal and the delayed test signal are converted into the broadcast level signal and the test level signal by a preset peak detection algorithm.

8. The audio delay test device of a broadcasting system as claimed in claim 6, characterized in that: The test result output module calculates and outputs the delay test result according to the broadcast level signal and the test level signal, including: Acquire the broadcast pulse rising edge of the broadcast level signal and the test pulse rising edge of the test level signal; The rising edge of the test pulse is used as the test start time, and the rising edge of the broadcast pulse is used as the test end time; The delay test result is calculated and output according to the test start time and the test end time.

9. An audio delay test system for a broadcasting system, characterized in that: The audio delay test system comprises an audio delay test device for a broadcasting system and a networked broadcasting system as described in any one of claims 6 to 8; wherein: The audio input device of the networked broadcasting system is electrically connected to the test signal output end of the audio delay test device; The audio output device of the networked broadcasting system is electrically connected to the test signal input terminal of the audio delay testing device; The networked broadcasting system is used to receive the delay test signal or the synchronization test signal output by the audio delay test device, and encapsulate the delay test signal or the synchronization test signal and feed it back to the audio delay test device.

10. The audio delay test system of a broadcasting system as claimed in claim 9, characterized in that: The audio delay test system comprises an audio input device, an audio output device and a network switch; wherein: The signal input terminal of the network switch is electrically connected to the audio input device; The signal output terminal of the network switch is electrically connected to the audio output device; The network switch is used to encapsulate the delay test signal or the synchronization test signal input by the audio input device and transmit it to the audio output device; The audio input device is used to receive the delay test signal or the synchronization test signal, and transmit the delay test signal or the synchronization test signal to the network switch; The audio output device is used to receive the encapsulated broadcast test signal and the synchronous broadcast signal, and transmit the broadcast test signal and the synchronous broadcast signal to the audio delay test device.

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