Audio transmitting device and audio listening teaching system

Abstract

The utility model discloses an audio transmitting device and an audio listening teaching system. The audio transmitting device is applied to the audio listening teaching system and comprises an audio receiving mechanism, an audio conversion mechanism and an audio transmitting mechanism. Wherein the audio emission mechanism comprises a Bluetooth infrared coding modulation module, a Bluetooth infrared radio conversion module and a Bluetooth infrared wireless signal emission module. The audio transmitting device provided by the embodiment of the utility model can simultaneously transmit two wireless audio signals, namely the Bluetooth wireless audio signal and the infrared wireless audio signal, so that a wireless communication mode is added, if the infrared audio signal is interfered, a hearing test can be continued by using the Bluetooth wireless audio signal, and the hearing test efficiency is improved. The hearing examination is not affected, and the use safety and stability of the audio hearing teaching system are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of audio transmission technology, in particular to an audio emitting device and an audio listening teaching system. BACKGROUND

[0002] At present, infrared audio transmission technology has been widely used in places such as karaoke, conference rooms, school classrooms, etc.

[0003] The existing infrared digital voice listening emitting terminal on the market is to transmit infrared light in a straight line, which needs to ensure that there is no obstacle between the transmitter and the receiver. Because infrared light is line-of-sight communication, the transmitter and the receiver must always face each other, which has high requirements for the installation position of the emitting terminal, and can only emit infrared wireless signals, so the selection of the examinee is relatively single. If the infrared audio signal is disturbed, it will inevitably affect the listening test. CONTENT OF THE INVENTION

[0004] The purpose of the embodiment of the present application is to provide an audio emitting device and an audio listening teaching system to solve the problem that the existing audio emitting terminal is relatively single and the listening test will be affected if the infrared audio signal is disturbed.

[0005] In a first aspect, the present embodiment provides an audio emitting device applied to an audio listening teaching system, which comprises:

[0006] An audio receiving mechanism for receiving an externally input analog audio signal or a first digital audio signal;

[0007] An audio conversion mechanism connected with the audio receiving mechanism, for performing analog-digital conversion on the analog audio signal to obtain the first digital audio signal, and performing digital signal processing on the first digital audio signal to output a second digital audio signal;

[0008] An audio emitting mechanism connected with the audio conversion mechanism, for encoding, modulating and signal conversion processing on the second digital audio signal, and emitting a Bluetooth wireless audio signal and an infrared wireless audio signal;

[0009] The audio emitting mechanism comprises a Bluetooth infrared encoding and modulating module, a Bluetooth infrared radio conversion module and a Bluetooth infrared wireless signal emitting module;

[0010] The Bluetooth infrared encoding and modulating module is connected with the audio conversion mechanism, for encoding and modulating the second digital audio signal, and outputting a Bluetooth audio modulated signal and an infrared audio modulated signal;

[0011] The Bluetooth infrared radio conversion module is connected with the Bluetooth infrared coding modulation module, and is used for signal conversion of the Bluetooth audio modulation signal and the infrared audio modulation signal.

[0012] The Bluetooth infrared wireless signal emission module is connected with the Bluetooth infrared radio conversion module, and is used for emitting the Bluetooth wireless audio signal and the infrared wireless audio signal.

[0013] In some embodiments, the Bluetooth infrared coding modulation module comprises:

[0014] The Bluetooth coding modulation module is connected with the audio conversion mechanism, and is used for coding and modulating the second digital audio signal to output the Bluetooth audio modulation signal.

[0015] The infrared coding modulation module is connected with the audio conversion mechanism, and is used for coding and modulating the second digital audio signal to output the infrared audio modulation signal.

[0016] In some embodiments, the Bluetooth coding modulation module comprises:

[0017] The LC3 encoder is used for at least including MDCT transform, quantization and sum entropy coding, frame header and bit stream construction on the second digital audio signal to output the Bluetooth audio coding signal.

[0018] The GFSK modulator is used for digital frequency modulation on the Bluetooth audio coding signal to adaptively change the Bluetooth emission frequency.

[0019] In some embodiments, the infrared coding modulation module comprises:

[0020] The FLAC encoder is used for lossless compression coding on the second digital audio signal to obtain the infrared pulse signal.

[0021] The infrared modulator is used for modulating the infrared pulse signal.

[0022] In some embodiments, the Bluetooth infrared radio conversion module comprises:

[0023] The Bluetooth radio conversion module is connected with the Bluetooth coding modulation module, and is used for converting the Bluetooth audio modulation signal into a high-frequency radio wave signal.

[0024] The infrared radio conversion module is connected with the infrared coding modulation module, and is used for converting the infrared audio modulation signal into a carrier signal used for infrared transmission.

[0025] In some embodiments, the Bluetooth infrared wireless signal emission module comprises:

[0026] The Bluetooth emission module is connected with the Bluetooth radio conversion module, and is used for emitting the high-frequency radio wave signal through a broadcast mode, the high-frequency radio wave signal being the Bluetooth wireless audio signal.

[0027] The infrared emission module is connected with the infrared radio conversion module, and is configured to convert the carrier signal into an infrared light wave signal and emit the infrared light wave signal.

[0028] In some embodiments, the Bluetooth emission module includes a Bluetooth antenna assembly.

[0029] In some embodiments, the audio receiving mechanism includes:

[0030] The digital audio input circuit is configured to receive an externally input first digital audio signal.

[0031] The analog audio input circuit is configured to receive an externally input analog audio signal.

[0032] In some embodiments, the audio conversion mechanism includes:

[0033] The analog-to-digital conversion circuit is connected with the analog audio input circuit, and is configured to perform analog-to-digital conversion on the analog audio signal and output the first digital audio signal.

[0034] The digital signal processing circuit is connected with the analog-to-digital conversion circuit and the digital audio input circuit respectively, and is configured to perform digital signal processing on the first digital audio signal and output a second digital audio signal.

[0035] In a second aspect, the embodiments of the present application provide an audio hearing teaching system, which includes an audio pickup device and an audio emission device provided by any of the above embodiments.

[0036] The audio pickup device includes:

[0037] The Bluetooth infrared wireless signal receiving module includes a Bluetooth receiver and an infrared receiver, the Bluetooth receiver being configured to receive the Bluetooth wireless audio signal, and the infrared receiver being configured to receive the infrared wireless audio signal.

[0038] The Bluetooth infrared wireless signal decoding module is connected with the Bluetooth infrared wireless signal receiving module, and is configured to decode the Bluetooth wireless audio signal and the infrared wireless audio signal.

[0039] The Bluetooth infrared wireless signal output module is connected with the Bluetooth infrared wireless signal decoding module, and is configured to amplify, limit, filter, demodulate and shape process the decoded Bluetooth wireless audio signal and the infrared wireless audio signal and output.

[0040] The audio emitting device provided by the embodiment of the present application is applied to an audio listening teaching system, and the audio emitting device comprises an audio receiving mechanism, an audio converting mechanism and an audio emitting mechanism; wherein the audio emitting mechanism comprises a Bluetooth infrared coding modulation module, a Bluetooth infrared radio converting module and a Bluetooth infrared wireless signal emitting module. The audio emitting device provided by the embodiment of the present application can emit two kinds of wireless audio signals, i.e. Bluetooth wireless audio signals and infrared wireless audio signals, simultaneously, and the wireless communication mode is increased. If the infrared audio signal is interfered, the listening test can be continued by using the Bluetooth wireless audio signal, and the listening test will not be affected, and the safety and stability of the audio listening teaching system are increased. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 A structural schematic diagram of an audio generating device provided by the embodiment of the present application is shown in the figure;

[0042] Figure 2 A structural schematic diagram of another audio generating device provided by the embodiment of the present application is shown in the figure;

[0043] Figure 3 A structural schematic diagram of an audio listening teaching system provided by the embodiment of the present application is shown in the figure;

[0044] Figure 4 A structural schematic diagram of another audio listening teaching system provided by the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0045] The various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0046] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be construed as limiting, but merely as exemplification of the embodiments. Those skilled in the art will envision other modifications within the scope and spirit of the present application.

[0047] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and, together with the general description of the application given above, and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0048] These and other characteristics of the present application will become apparent from the following description of the preferred forms given, by way of non-limiting example only, with reference to the attached drawings.

[0049] It should also be understood that, while the present application has been described above with reference to particular embodiments, the persons skilled in the art could make many other equivalent forms of the present application.

[0050] The above and other aspects, features, and advantages of the present application will become more apparent from the following detailed description, taken in conjunction with the accompanying drawings, which illustrate

[0051] Specific embodiments of the present application are described herein with reference to the accompanying drawings. However, it will be understood that the application is not limited to the embodiments described, but can be practiced with modification and alteration within the scope of the application. Accordingly, the specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and a representative basis for teaching one skilled in the art to variously employ the present application.

[0052] The specification can use phrases such as "in one embodiment", "in another embodiment", "in yet another embodiment", or "in other embodiments", which can refer to one or more embodiments according to the present application.

[0053] In a first aspect, the present embodiment provides an audio transmitting device 130 applied to an audio hearing teaching system, such as Figure 1 As shown, the audio transmitting device 130 includes an audio receiving mechanism 10, an audio converting mechanism 11, and an audio transmitting mechanism 12.

[0054] Specifically, the audio receiving mechanism 10 is configured to receive an externally input analog audio signal or a first digital audio signal;

[0055] The audio converting mechanism 11 is connected to the audio receiving mechanism 10, configured to perform analog-to-digital conversion on the analog audio signal to obtain the first digital audio signal, and perform digital signal processing on the first digital audio signal to output a second digital audio signal;

[0056] The audio transmitting mechanism 12 is connected to the audio converting mechanism 11, configured to perform encoding, modulation, and signal conversion processing on the second digital audio signal, and transmit a Bluetooth wireless audio signal and an infrared wireless audio signal;

[0057] The audio transmitting mechanism 12 includes a Bluetooth infrared encoding and modulation module 121, a Bluetooth infrared radio conversion module 122, and a Bluetooth infrared wireless signal transmitting module 123.

[0058] The Bluetooth infrared encoding and modulation module 121 is connected to the audio converting mechanism 11, configured to perform encoding and modulation on the second digital audio signal, and output a Bluetooth audio modulation signal and an infrared audio modulation signal;

[0059] The Bluetooth infrared radio conversion module 122 is connected to the Bluetooth infrared encoding and modulation module 121, configured to perform signal conversion on the Bluetooth audio modulation signal and the infrared audio modulation signal;

[0060] The Bluetooth infrared wireless signal transmitting module 123 is connected with the Bluetooth infrared wireless radio converting module 122, and is used for transmitting the Bluetooth wireless audio signal and the infrared wireless audio signal.

[0061] The audio transmitting device provided by the embodiment of the present application is applied to the audio listening teaching system, and the audio transmitting device comprises an audio receiving mechanism, an audio converting mechanism and an audio transmitting mechanism; wherein the audio transmitting mechanism comprises a Bluetooth infrared coding modulation module, a Bluetooth infrared wireless radio converting module and a Bluetooth infrared wireless signal transmitting module. The audio transmitting device provided by the embodiment of the present application can transmit two kinds of wireless audio signals, i.e. the Bluetooth wireless audio signal and the infrared wireless audio signal, at the same time, and the wireless communication mode is increased. If the infrared audio signal is interfered, the listening test can be continued by using the Bluetooth wireless audio signal, and the listening test will not be affected, and the safety and stability of the audio listening teaching system are increased.

[0062] In some embodiments, as shown in Figure 2 The audio receiving mechanism 10 comprises a digital audio input circuit and an analog audio input circuit.

[0063] The digital audio input circuit is used for receiving the first digital audio signal inputted from outside;

[0064] The analog audio input circuit is used for receiving the analog audio signal inputted from outside.

[0065] Exemplarily, the audio receiving mechanism mainly receives the analog audio signal outputted from the audio distributor or the first digital audio signal outputted from the audio signal processor through different interfaces (such as the TRS socket, the RJ45 socket and the like).

[0066] In some embodiments, as shown in Figure 2 The audio converting mechanism 11 comprises an analog-digital converting circuit and a digital signal processing circuit.

[0067] The analog-digital converting circuit is connected with the analog audio input circuit, and is used for performing analog-digital conversion on the analog audio signal and outputting the first digital audio signal;

[0068] The digital signal processing circuit is connected with the analog-digital converting circuit and the digital audio input circuit respectively, and is used for performing digital signal processing on the first digital audio signal and outputting the second digital audio signal.

[0069] Optionally, the digital signal processing circuit comprises a digital filtering circuit, a digital limiting circuit, a digital amplifying circuit and a digital delaying circuit which are connected in sequence.

[0070] The digital filtering circuit is connected with the digital audio input circuit and the analog-digital converting circuit, and is used for performing digital filtering processing on the first digital audio signal;

[0071] a digital limiting circuit, connected with the digital filtering circuit, for amplitude processing of the digital audio signal after filtering processing;

[0072] a digital amplifying circuit, connected with the digital limiting circuit, for amplifying processing of the digital audio signal after limiting processing;

[0073] a digital delaying circuit, connected with the digital amplifying circuit, for delaying processing of the digital audio signal after amplifying processing, and outputting a second digital audio signal.

[0074] The embodiment of the present application firstly converts the analog audio signal of the audio receiving mechanism into a digital audio signal through the analog-digital conversion circuit and the digital signal processing circuit, and performs digital filtering, digital limiting, digital amplifying, digital delaying and the like on the converted digital audio signal to ensure its quality and adapt to the subsequent encoding process.

[0075] In some embodiments, the Bluetooth infrared encoding modulation module 121 comprises a Bluetooth encoding modulation module and an infrared encoding modulation module.

[0076] The Bluetooth encoding modulation module, connected with the audio converting mechanism, is used for encoding and modulating the second digital audio signal, and outputting a Bluetooth audio modulated signal;

[0077] The infrared encoding modulation module, connected with the audio converting mechanism, is used for encoding and modulating the second digital audio signal, and outputting an infrared audio modulated signal.

[0078] In some embodiments, the Bluetooth encoding modulation module comprises:

[0079] an LC3 encoder, used for at least including MDCT transform, quantization and entropy encoding, frame header and bit stream construction on the second digital audio signal, and outputting a Bluetooth audio encoded signal;

[0080] a GFSK modulator, used for digital frequency modulation on the Bluetooth audio encoded signal to adaptively change the Bluetooth transmitting frequency.

[0081] Specifically, the LC3 (Low Complexity Communication Codec) encoder is used for efficient encoding. Specifically, first, the data signal is subjected to dynamic gain control (DGC) and high-frequency pre-emphasis by the pre-processing module; then variable window switching and frequency domain resolution are completed by MDCT (Modified Discrete Cosine Transform); then the masking effect is calculated by the psychoacoustic model; finally, efficient lossless encoding compression data (reducing transmission bandwidth) is completed by time domain noise shaping and entropy coding optimization. Finally, the synchronization header, CRC check and other fields are added to form the baseband protocol data unit (BB-PDU) for data encapsulation.

[0082] The Bluetooth data modulation GFSK (Gaussian Frequency Shift Keying) modulator performs digital frequency modulation to ensure the transmission of audio signals by changing the frequency of radio waves; by using frequency hopping technology, data can be effectively protected from interference from other wireless devices, and the stability of communication can be improved.

[0083] In some embodiments, the infrared coding modulation module includes:

[0084] The FLAC encoder is used for lossless compression encoding of the second digital audio signal to obtain an infrared pulse signal.

[0085] The infrared modulator is used for modulating the infrared pulse signal.

[0086] Specifically, the infrared data coding is performed by the coding processing system, which converts the audio signal into a series of infrared pulse signals through FLAC (Free Lossless Audio Codec) lossless compression encoding. During the encoding process, the characteristics of the audio signal (such as amplitude, frequency, etc.) are converted into parameters such as the width, position or number of pulses in the infrared signal.

[0087] Infrared data modulation utilizes various modulation techniques such as pulse position modulation (PPM) and pulse width modulation (PWM) to convert low-frequency audio signals (20Hz-20KHz) into high-frequency infrared signals (carrier frequency of 250KHz-1MHz) to overcome the bandwidth limitations and noise interference of infrared LEDs. PWM modulation transmits data by changing the width of the pulse, while PPM modulation transmits data by changing the time interval between pulse strings.

[0088] In some embodiments, the Bluetooth infrared radio conversion module 122 includes a Bluetooth radio conversion module and an infrared radio conversion module.

[0089] The Bluetooth radio conversion module is connected with the Bluetooth coding modulation module, and is used for converting the Bluetooth audio modulation signal into a high-frequency radio wave signal.

[0090] The infrared radio conversion module is connected with the infrared coding modulation module, and is used for converting the infrared audio modulation signal into a carrier signal used for infrared transmission.

[0091] Exemplarily, the Bluetooth radio conversion module comprises a Bluetooth radio frequency generator, a filtering module and a power amplification module which are electrically connected in sequence. Specifically, the Bluetooth radio transmission is first converted into a high-frequency radio wave signal by the radio frequency generator, and then is switched at 1600 hops per second on the ISM frequency band of 2.402 GHz to 2.480 GHz by frequency hopping spread (FHSS) to complete dynamic adjustment of the frequency hopping interval to realize dynamic avoidance of the interference channel, so as to realize adaptive frequency modulation, and then is filtered and power-amplified and transmitted to the Bluetooth emission module.

[0092] Exemplarily, the infrared radio conversion module comprises an infrared frequency generator, a filtering module and a power amplification module which are electrically connected in sequence. Specifically, the infrared transmission is that the infrared data signal which has completed coding and modulation is converted into a carrier frequency of 30 kHz to 60 kHz suitable for infrared transmission by the infrared frequency generator, and then is filtered and power-amplified and transmitted to the infrared emission module.

[0093] In some embodiments, the Bluetooth infrared wireless signal emission module 123 comprises a Bluetooth emission module and an infrared emission module.

[0094] The Bluetooth emission module is connected with the Bluetooth radio conversion module, and is used for emitting the high-frequency radio wave signal which is the Bluetooth wireless audio signal by a broadcast mode.

[0095] The infrared emission module is connected with the infrared radio conversion module, and is used for converting the carrier signal into an infrared light wave signal and emitting the infrared light wave signal which is the infrared wireless audio signal.

[0096] In some embodiments, the Bluetooth emission module comprises a Bluetooth antenna assembly.

[0097] Exemplarily, the Bluetooth transmitting module radiates high-frequency (for example, 2.4 GHz) radio wave signals into the surrounding environment by means of a patch ceramic antenna, and the high-frequency radio wave signals are converted from coded modulated radio signals to comply with specific frequencies defined in Bluetooth technology and the LE Audio (Low Energy Audio) protocol based on Bluetooth 5.2+ and broadcast mode. The transmitting power is dynamically adjusted according to the signal strength; the adaptive frequency hopping (AFH) technology can improve the anti-interference capability; the multi-device management enhancement function can maintain one-to-many connection within the effective radius in the long-distance broadcast mode.

[0098] Exemplarily, the infrared transmitting module is to convert a carrier signal suitable for infrared transmission into an infrared light wave signal and emit it into the surrounding environment.

[0099] Exemplarily, the infrared transmitting module can include an infrared LED driving circuit and an infrared LED array connected by wires. The carrier signal suitable for infrared transmission is amplified by the infrared LED driving circuit, and then the infrared LED array emits an infrared light wave signal into the surrounding space. The current size output by the infrared LED driving circuit controls the distance of infrared emission, which is generally controlled at about 500 mA (milliampere).

[0100] Exemplarily, the infrared LED driving circuit includes a plurality of MOSFET transistors.

[0101] In a second aspect, the embodiments of the present application provide an audio hearing teaching system, as shown in Figure 3 The audio hearing teaching system includes a sound pickup device 140 and an audio transmitting device 130 provided by any of the above embodiments; the audio transmitting device 130 is wirelessly connected to the sound pickup device 140.

[0102] In some embodiments, the sound pickup device 140 can be multiple, that is, the audio transmitting device 130 is wirelessly connected to multiple sound pickup devices 140.

[0103] In some embodiments, the sound pickup device 140 includes:

[0104] The Bluetooth infrared wireless signal receiving module 20 includes a Bluetooth receiver and an infrared receiver, the Bluetooth receiver is used to receive Bluetooth wireless audio signals, and the infrared receiver is used to receive infrared wireless audio signals;

[0105] The Bluetooth infrared wireless signal decoding module 21 is connected to the Bluetooth infrared wireless signal receiving module 20, and is used to decode the Bluetooth wireless audio signals and the infrared wireless audio signals;

[0106] The Bluetooth infrared wireless signal output module 22 is connected with the Bluetooth infrared wireless signal decoding module 21, and is used for amplifying, limiting, filtering, demodulating and shaping the decoded Bluetooth wireless audio signal and infrared wireless audio signal and outputting.

[0107] Further, the Bluetooth infrared wireless signal output module 22 directly transmits the Bluetooth wireless audio signal and infrared wireless audio signal which have been amplified, limited, filtered, demodulated and shaped to the control host through wired connection or wireless connection.

[0108] Exemplarily, the infrared receiver includes a photosensitive diode for receiving the infrared wireless audio signal.

[0109] Exemplarily, the Bluetooth infrared wireless signal decoding module 21 includes a Bluetooth decoder and the photosensitive diode; the Bluetooth decoder is used for decoding the Bluetooth wireless audio signal; and the photosensitive diode is used for converting and restoring (i.e. decoding) the received infrared wireless audio signal.

[0110] In some embodiments, referring to FIG. 1, Figure 4 As shown in FIG. 1, the audio hearing teaching system further includes: a first audio signal output device 50 or a second audio signal output device 60, a sound mixing device 70, a first audio signal processing device 80 or a second audio signal processing device 90, a control host 110 and a playback device 120;

[0111] The first audio signal output device 50 or the second audio signal output device 60 is used for outputting an analog audio signal.

[0112] The sound mixing device 70 is connected with the first audio signal output device 50 or the second audio signal output device 60.

[0113] The first audio signal processing device 80 and the second audio signal processing device 90 are connected with the sound mixing device 70.

[0114] An audio emitting device 130 is connected with the first audio signal processing device 80 and the second audio signal processing device 90 respectively.

[0115] The audio emitting device 130 is wirelessly connected with a sound pickup device 140.

[0116] The sound pickup device 140 is connected with the control host 110 in a wired or wireless manner.

[0117] The control host 110 is connected with the playback device 120.

[0118] Optionally, the first audio signal output device 50 can be an audio playing device.

[0119] Optionally, the second audio signal output device 60 can be a microphone.

[0120] Optionally, the sound tuning device 70 can be an audio effecter or a sound console;

[0121] Optionally, the first audio signal processing device 80 can be an audio distributor;

[0122] Optionally, the second audio signal processing device 90 can be an audio signal processor.

[0123] In some embodiments, the audio hearing teaching system further comprises a power supply 100 for powering the devices in the audio hearing teaching system.

[0124] Specifically, taking the first audio signal output device 50 as an audio playing device, the second audio signal output device 60 as a microphone, the sound tuning device 70 as an audio effecter or a sound console, the first audio signal processing device 80 as an audio distributor, and the second audio signal processing device 90 as an audio signal processor as examples, the audio hearing teaching system provided by the embodiments of the present application is described.

[0125] The audio hearing teaching system outputs analog audio signals through an audio playing device or a microphone; secondly, the volume of the analog audio signals output by the device is controlled through an audio effecter or a sound console, and then the analog audio signals with the adjusted volume are transmitted to the audio emitting device 130 through an audio distributor using an analog audio signal line or through an audio signal processor using a network cable, the audio emitting device 130 can emit wireless audio signals in two different modes of Bluetooth and infrared at the same time. The audio emitting device 130 receives the Bluetooth wireless audio signals and the infrared wireless audio signals from the audio emitting device 130, and transmits them to the control host 110 through an analog signal line or a network cable, and then the control host 110 outputs the Bluetooth wireless audio signals and the infrared wireless audio signals to the sound playing device 120 (such as a listening speaker or other external playing device). The audio emitting device 130 and the control host 110 can also be connected through a wireless mode. As shown in the figure, the audio emitting device 130 is connected to the control host 110 through a connection line 30, and the audio emitting device 130 is connected to the control host 110 through a wireless mode 40. Figure 4

[0126] Further, the audio hearing teaching system further comprises a display connected to the control host 110, for displaying or playing the Bluetooth wireless audio signals and the infrared wireless audio signals received by the control host 110, and remotely and quickly identifying the working state of the audio emitting device 130 in each room, avoiding on-site inspection, etc.

[0127] ​The received Bluetooth wireless audio signal and infrared wireless audio signal are transmitted to the control host 110 through the sound pickup device 140, and the Bluetooth wireless audio signal and infrared wireless audio signal are displayed through the display, and the working state of the audio emitting device 130 in each room can be quickly and efficiently completed. The audio listening teaching system inspection process.

[0128] The audio listening teaching system provided by the embodiment of the application has the following beneficial effects:

[0129] 1. Compared with the traditional audio listening teaching system, the audio emitting device of the audio listening teaching system in the application can emit two different modes of wireless digital audio signals at the same time, so that the sound pickup device can receive two different modes of wireless digital audio signals at the same time, thereby improving the diversity of the audio listening teaching system, increasing the matching degree of different receiving terminals, and increasing the safety, stability and reliability of the audio listening teaching system.

[0130] 2. The Bluetooth and infrared wireless audio signals of two different modes received by the sound pickup device are transmitted back to the control host, which can realize real-time listening to the Bluetooth and infrared wireless audio signals of two different modes emitted by the audio emitting device, and can realize real-time monitoring of whether the wireless audio signals of each test room are normal. If not, it can be reminded in time, saving the time cost of the test, and being more efficient and fast.

[0131] 3. The Bluetooth wireless audio signal emitted by the audio emitting device of the embodiment of the application can correspond to two and more than two sound pickup devices at the same time, that is, two and more than two sound pickup devices can synchronously receive the Bluetooth wireless audio signal emitted by the audio emitting device.

[0132] 4. The audio emitting device is a wireless digital audio emitting technology containing Bluetooth and infrared two modes, which is more environmentally friendly during operation, consumes less energy, and is more energy-saving.

[0133] 5. The audio emitting device can emit Bluetooth wireless audio signal and infrared wireless audio signal at the same time, which increases the wireless communication mode, has stronger anti-interference performance, and can ensure that it is not easily disturbed by the electromagnetic signals of electronic equipment and wireless communication equipment, so as to ensure that the wireless audio signal of the sound pickup device is clearer.

[0134] 6. The Bluetooth wireless audio signal emitted by the audio emitting device has an encryption function in the transmission process, and the infrared wireless audio signal has the characteristic of not being able to penetrate walls, so the two kinds of wireless audio signals are not easy to leak, and both have high confidentiality.

[0135] 7、The audio transmitting device integrates two kinds of audio transmitting technologies, has high module integration, small size, can better complete the integrated installation of the equipment terminal, is favorable for production and processing, and can save a large amount of production cost. The Bluetooth transmission is not easily affected by an obstruction, so the installation position requirement of the audio transmitting device is relatively low, and a large amount of construction design cost can be saved.

[0136] The above examples are only exemplary embodiments of the present application and are not intended to limit the present application, and the protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements are also regarded as falling within the protection scope of the present application.

Claims

1. An audio transmitting device, characterized in that, The audio transmitting device, used in an audio listening teaching system, includes: An audio receiving mechanism for receiving externally input analog audio signals or first digital audio signals; An audio conversion mechanism, connected to the audio receiving mechanism, is used to perform analog-to-digital conversion on the analog audio signal to obtain the first digital audio signal, and to perform digital signal processing on the first digital audio signal to output a second digital audio signal. An audio transmitting mechanism, connected to the audio conversion mechanism, is used to encode, modulate, and convert the second digital audio signal, and to transmit Bluetooth wireless audio signals and infrared wireless audio signals. The audio transmitting mechanism includes a Bluetooth infrared code modulation module, a Bluetooth infrared radio conversion module, and a Bluetooth infrared wireless signal transmitting module; The Bluetooth infrared encoding modulation module is connected to the audio conversion mechanism and is used to encode and modulate the second digital audio signal, and output Bluetooth audio modulation signal and infrared audio modulation signal; The Bluetooth infrared radio conversion module is connected to the Bluetooth infrared encoding modulation module and is used to convert the Bluetooth audio modulation signal and the infrared audio modulation signal. The Bluetooth infrared wireless signal transmitting module is connected to the Bluetooth infrared radio conversion module to transmit the Bluetooth wireless audio signal and the infrared wireless audio signal.

2. The audio transmitting device according to claim 1, characterized in that, The Bluetooth infrared encoding modulation module includes: A Bluetooth encoding and modulation module, connected to the audio conversion mechanism, is used to encode and modulate the second digital audio signal and output a Bluetooth audio modulation signal; An infrared encoding modulation module, connected to the audio conversion mechanism, is used to encode and modulate the second digital audio signal and output an infrared audio modulation signal.

3. The audio transmitting device according to claim 2, characterized in that, The Bluetooth coding and modulation module includes: The LC3 encoder is used to perform at least MDCT transformation, quantization and entropy coding, frame header and bitstream construction on the second digital audio signal, and output a Bluetooth audio encoded signal. A GFSK modulator is used to digitally modulate the Bluetooth audio encoded signal.

4. The audio transmitting device according to claim 2, characterized in that, The infrared coding modulation module includes: The FLAC encoder is used to perform lossless compression encoding on the second digital audio signal to obtain an infrared pulse signal; An infrared modulator is used to modulate the infrared pulse signal.

5. The audio transmitting device according to claim 2, characterized in that, The Bluetooth infrared radio conversion module includes: A Bluetooth radio conversion module, connected to the Bluetooth encoding and modulation module, is used to convert the Bluetooth audio modulation signal into a high-frequency radio wave signal; An infrared radio conversion module, connected to the infrared encoding modulation module, is used to convert the infrared audio modulation signal into a carrier signal for infrared transmission.

6. The audio transmitting device according to claim 5, characterized in that, The Bluetooth infrared wireless signal transmitting module includes: A Bluetooth transmitting module, connected to the Bluetooth radio conversion module, is used to transmit the high-frequency radio wave signal in broadcast mode, wherein the high-frequency radio wave signal is the Bluetooth wireless audio signal; An infrared transmitting module, connected to the infrared radio conversion module, is used to convert the carrier signal into an infrared light wave signal and transmit the infrared light wave signal, wherein the infrared light wave signal is the infrared wireless audio signal.

7. The audio transmitting device according to claim 6, characterized in that, The Bluetooth transmitting module includes a Bluetooth antenna assembly.

8. The audio transmitting device according to claim 1, characterized in that, The audio receiving mechanism includes: Digital audio input circuit, used to receive the first digital audio signal from an external input; Analog audio input circuit, used to receive analog audio signals from external input.

9. The audio transmitting device according to claim 8, characterized in that, The audio conversion mechanism includes: An analog-to-digital converter circuit, connected to the analog audio input circuit, is used to perform analog-to-digital conversion on the analog audio signal and output a first digital audio signal; A digital signal processing circuit is connected to the analog-to-digital converter circuit and the digital audio input circuit, respectively, and is used to perform digital signal processing on the first digital audio signal and output a second digital audio signal.

10. An audio listening teaching system, characterized in that, Includes a microphone and an audio transmitter as described in any one of claims 1 to 9; the audio transmitter is wirelessly connected to the microphone. The sound pickup device includes: A Bluetooth infrared wireless signal receiving module includes a Bluetooth receiver and an infrared receiver, wherein the Bluetooth receiver is used to receive the Bluetooth wireless audio signal, and the infrared receiver is used to receive the infrared wireless audio signal; A Bluetooth infrared wireless signal decoding module, connected to the Bluetooth infrared wireless signal receiving module, is used to decode the Bluetooth wireless audio signal and the infrared wireless audio signal; A Bluetooth infrared wireless signal output module is connected to the Bluetooth infrared wireless signal decoding module. It is used to amplify, limit, filter, demodulate, and shape the decoded Bluetooth wireless audio signal and the infrared wireless audio signal and then output them.

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