A multi-path audio coupling device, intelligent lock and door

Abstract

The application provides a multi-channel audio coupling device, a smart lock and a door, wherein the multi-channel audio coupling device comprises: a plurality of audio signal access modules for accessing audio signals; a coupling circuit module, an input end of the coupling circuit module being connected with output ends of the plurality of audio signal access modules, for coupling the accessed multi-channel audio signals into one channel of coupled audio signals and outputting; and an audio power amplifier module, an input end of the audio power amplifier module being connected with an output end of the coupling circuit module, for performing power amplification processing on the received coupled audio signals. The application can solve the technical problem in the prior art that a lock has a plurality of built-in loudspeakers, the cost is increased, and a special design is required in structure, which extremely occupies space and seriously affects the structural complexity and the simplicity of appearance.

Description

Technical Field

[0001] The present invention relates to the field of electronic circuit technology, and in particular to a multi-channel audio coupling device, a smart lock and a door. Background Technology

[0002] Smart locks are increasingly integrating functions, evolving from simple unlocking to include security monitoring, voice intercom, and AI voice recognition smart intercom, with each module operating independently. However, smart lock manufacturers may not be adept at producing these individual modules or developing the internal algorithms for their functionality. Currently, the common practice is to outsource the development of custom modules from manufacturers specializing in these areas before integrating them. This often results in multiple modules needing to play sound, leading to multiple built-in speakers in the lock, increasing costs. Furthermore, the structural design for each speaker is extremely space-consuming, severely impacting structural complexity and aesthetic simplicity. Summary of the Invention

[0003] This application provides a multi-channel audio coupling device, a smart lock, and a door to solve the technical problems in the prior art where locks have multiple built-in speakers, which increases costs and requires special design for each speaker, taking up a lot of space and seriously affecting structural complexity and aesthetic simplicity.

[0004] The first aspect of the present invention provides a multi-channel audio coupling device, comprising: a plurality of audio signal input modules for inputting audio signals; a coupling circuit module, the input terminal of which is connected to the output terminal of the plurality of audio signal input modules for coupling the input multiple audio signals into a single coupled audio signal and outputting it; and an audio power amplifier module, the input terminal of which is connected to the output terminal of the coupling circuit module for power amplification of the received coupled audio signal.

[0005] The multi-channel audio coupling device provided in this invention significantly reduces cost and structural design complexity by combining multiple audio signals into a single coupled audio signal for output.

[0006] Optionally, it also includes: an enable circuit module, the input of which is connected to the output of multiple audio signal input modules, and the output of which is connected to the enable terminal of an audio power amplifier module, for controlling the audio power amplifier module to respond to the power amplification processing of the received coupled audio signal when any audio signal is input.

[0007] Optionally, the coupling circuit module includes: a multi-channel filtering circuit, each filtering circuit being used to denoise the input audio signal; and a coupling circuit, the input terminal of which is connected to the output terminal of each filtering circuit, for coupling the audio signal denoised by each filtering circuit into a single coupled audio signal for output.

[0008] Optionally, the coupling circuit module further includes a step-down circuit, which is located at the front end of the coupling circuit and is used to step down each input audio signal.

[0009] Optionally, the step-down circuit is a bidirectional step-down circuit; the filter circuit is a band-pass filter circuit or a low-pass filter circuit.

[0010] Optionally, the coupling circuit module further includes: a multi-channel isolation circuit, each isolation circuit being disposed between the filter circuit and the coupling circuit, for isolating the audio signal input circuits from each other.

[0011] Optionally, the enable circuit module includes: a first OR logic circuit for performing OR logic operations on the enable signal accompanying each input audio signal.

[0012] Optionally, the enable circuit module includes: a detector circuit for detecting whether there is an audio signal input; a delay circuit, the input of which is connected to the output of the detector circuit, for maintaining the signal detected by the detector circuit for a preset duration; and a second OR logic circuit, the input of which is connected to the output of the delay circuit, for performing OR logic operation on the enable signal accompanying the input audio signal and the signal output by the delay circuit.

[0013] A second aspect of the present invention provides a smart lock, comprising: a multi-channel audio coupling device provided in the first aspect, or any optional embodiment of the first aspect; a speaker, wherein the input end of the speaker is connected to the output end of the audio power amplifier module of the multi-channel audio coupling device, for playing the coupled audio signal output by the multi-channel audio coupling device.

[0014] A third aspect of the present invention provides a door, comprising: the smart lock provided in the second aspect. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1This is a schematic diagram of a multi-channel audio coupling device provided in an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of a multi-channel audio coupling device provided in an embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of a multi-channel audio coupling device provided in an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of a multi-channel audio coupling device provided in an embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of a multi-channel audio coupling device provided in an embodiment of the present invention;

[0021] Figure 6 This is a schematic diagram of a multi-channel audio coupling device provided in an embodiment of the present invention;

[0022] Figure 7 This is a schematic diagram of a multi-channel audio coupling device provided in an embodiment of the present invention;

[0023] Figure 8 This is a schematic diagram of a smart lock structure provided in an embodiment of the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0025] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “a,” “an,” or “the,” as used in this disclosure, do not indicate a limitation of quantity, but rather indicate the presence of at least one. Terms such as “comprising” or “including” mean that an element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects.

[0026] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] To address the technical problems mentioned in the background section, embodiments of the present invention provide a multi-channel audio coupling device, such as... Figure 1 As shown, the device includes:

[0028] Multiple audio signal input modules are used to input audio signals.

[0029] For example, the accessed audio signal is generated by a corresponding module with voice prompt functionality, such as a prompt from the fingerprint verification module indicating "fingerprint verification failed" or "unlock successful," etc. Specifically, the module with voice prompt functionality may include, but is not limited to, security monitoring modules, voice intercom modules, and AI voice recognition modules with voice prompt functionality. Each audio signal access module corresponds to one module with voice prompt functionality. For example... Figure 1 The diagram shows multiple audio signal access modules: audio signal access module 1, audio signal access module 2, ..., audio signal access module N, each of which is used to access one audio signal.

[0030] A coupling circuit module is provided, with its input terminal connected to the output terminal of the plurality of audio signal input modules. This module couples the multiple input audio signals into a single coupled audio signal for output. The specific internal circuit composition of this coupling circuit module is not limited in this embodiment; those skilled in the art can determine it according to actual needs, as long as it enables the coupling of multiple audio signals.

[0031] The audio power amplifier module has its input terminal connected to the output terminal of the coupling circuit module, and is used to amplify the power of the received coupled audio signal.

[0032] For example, the audio power amplifier module includes an audio power amplifier that amplifies a small audio signal, increases its power, and then outputs it to drive a speaker to reproduce sound. This application does not limit the specific internal circuit composition of the audio power amplifier module; those skilled in the art can determine it according to actual needs, as long as it achieves audio signal power amplification.

[0033] The multi-channel audio coupling device provided in this invention significantly reduces cost and structural design complexity by combining multiple audio signals into a single coupled audio signal for output.

[0034] like Figure 2 As shown, in an optional embodiment of the present invention, it further includes:

[0035] The enable circuit module has its input connected to the output of multiple audio signal input modules and its output connected to the enable terminal of the audio power amplifier module. It is used to control the audio power amplifier module to respond to the power amplification processing of the received coupled audio signal when any audio signal is input.

[0036] For example, the enable circuit module can control the operating state of the audio amplifier module. Specifically, when there is an audio signal input, the enable circuit module pulls the enable terminal of the audio amplifier module high, causing the audio amplifier module to amplify the power of the input audio signal; when there is no audio signal input, the enable circuit module can keep the enable terminal of the audio amplifier module low or off, at which time the audio amplifier module is in a low-power or zero-power state. This application embodiment does not limit the specific internal circuit composition of the audio amplifier module; those skilled in the art can determine it according to actual needs, as long as the corresponding enable control function can be achieved.

[0037] The multi-channel audio coupling device provided in this embodiment of the invention controls the working state of the audio power amplifier module through an enable circuit module, avoiding the problem of ineffective power consumption caused by the static current in the circuit consuming energy even when there is no audio signal input, thus achieving the purpose of energy saving and improving the service life of the audio power amplifier module.

[0038] like Figure 3 As shown, in an optional embodiment of the present invention, the coupling circuit module includes:

[0039] A multi-channel filtering circuit, each channel of which is used to denoise the input audio signal.

[0040] For example, noise includes the modulated signal in the modulated audio signal and non-audio interference signals. The module with voice prompt function includes a power amplifier module that outputs a modulated audio signal, such as a Class D power amplifier, which uses PWM to modulate the audio signal. The PWM frequency is relatively high, generally in the hundreds of kHz range, and such modulation signals must be filtered out. At the same time, the coupling circuit module may also introduce some external non-audio interference signals while receiving the audio signal input from the audio signal input module.

[0041] The coupling circuit has its input terminal connected to the output terminal of each filter circuit, and is used to couple the audio signal after noise reduction by each filter circuit into a single coupled audio signal for output.

[0042] For example, the function of the coupling circuit is to combine multiple audio signals that have been denoised by the filtering circuit into one. The coupling method includes, but is not limited to, using capacitive coupling to superimpose two or more signals after DC isolation and output them.

[0043] The multi-channel audio coupling device provided in this embodiment of the invention performs noise reduction processing on the audio signal through a filtering circuit, avoiding the influence of circuit noise and environmental noise on the device and improving the device's immunity to interference; at the same time, it reduces interference signals in the audio signal and improves the audio signal quality.

[0044] like Figure 4 As shown, in an optional embodiment of the present invention, the coupling circuit module further includes:

[0045] A step-down circuit is located at the front end of the coupling circuit and is used to step down the voltage of each input audio signal.

[0046] For example, the step-down circuit can be placed before the filter current to directly receive the audio signal from the audio signal input module; alternatively, it can be placed after the filter circuit to step down the audio signal after noise reduction processing by the filter circuit before inputting it to the coupling circuit. The position of the step-down circuit in each input branch is not limited here. As an optional implementation, the step-down circuit can be in the form of a voltage divider.

[0047] The multi-channel audio coupling device provided in this embodiment of the invention uses a step-down circuit to step down input audio signals with different driving voltages, converting them into an output voltage suitable for the audio power amplifier module to process, so that the audio power amplifier module, as the load, can work normally.

[0048] As an optional embodiment of the present invention, the step-down circuit is a bidirectional step-down circuit.

[0049] For example, such as Figure 4 As shown, the step-down module can achieve bidirectional voltage reduction. Specifically, if audio signal input module 1 has a signal input, but audio signal input module 2 has no signal input, the signal from audio signal input module 1, after passing through various circuit modules in the first input branch, will be fed back to audio signal input module 2 after coupling through the coupling circuit, filter circuit 2, and step-down circuit 2. If the backflow energy is too high, it will damage the front-end circuit. Therefore, the step-down module here needs to be able to reduce the voltage of audio signals from left to right, and also reduce the voltage of signals from right to left, to ensure that the backflow voltage is small enough to protect the safety of the front-end circuit of the circuit module.

[0050] The filtering circuit is either a band-pass filter or a low-pass filter.

[0051] For example, in this embodiment, the filtering circuit uses a bandpass filter or a low-pass filter. The type of filter includes, but is not limited to, a second-order low-pass filter. The filtering range of the filtering circuit can be set within a preset range, such as the average hearing range of the human ear, but it is not limited to this. For example, 20kHz is the highest hearing value of the human ear, but it is not limited to 20kHz, because the frequency of human voice is much lower than this, allowing for adaptive adjustments; no limitation is made here. As an optional approach, the filtering circuit can use an RC filter.

[0052] By using bandpass or lowpass filter circuits to denoise audio signals, the difficulty of selecting filter circuits is reduced, and the filtering is more targeted, effectively improving filtering efficiency and quality.

[0053] like Figure 5 As shown, in an optional embodiment of the present invention, the coupling circuit module further includes:

[0054] A multi-channel isolation circuit is used, with each isolation circuit positioned between the filter circuit and the coupling circuit, to isolate the audio signal input circuits from each other.

[0055] For example, there are many isolation methods, such as relay isolation, optocoupler isolation, DC voltage isolation, linear isolation amplifier isolation, and A / D converter isolation. There are many types of isolation circuits, and their designs are relatively mature. They can be adapted to the specific application requirements and will not be elaborated upon here.

[0056] The multi-channel audio coupling device provided in this embodiment of the invention avoids voltage backflow between input branches by using isolation circuits between each input branch, thereby improving the safety and reliability of the circuit; it also cuts off noise crosstalk between each input branch, thereby suppressing noise interference between each input branch and improving the quality of the audio signal.

[0057] like Figure 6 As shown, in an optional embodiment of the present invention, the enable circuit module includes:

[0058] The first OR logic circuit is used to perform OR logic operations on the enable signal accompanying each input audio signal.

[0059] For example, when an input audio signal is accompanied by an output enable signal, the first OR logic circuit receives all the enable signals and performs an OR logic operation. When at least one enable signal is present, the first OR logic circuit outputs a high level, pulling the enable terminal of the audio power amplifier module high. The audio power amplifier module then responds by amplifying the power of the received coupled audio signal. When there is no input audio signal, i.e., no enable signal, the first OR logic circuit outputs a low level, pulling the enable terminal of the audio power amplifier module low or turning it off, and the audio power amplifier module does not work.

[0060] The multi-channel audio coupling device provided in this embodiment of the invention controls the working state of the audio power amplifier module through a first OR logic circuit, avoiding the problem of ineffective power consumption caused by the static current in the circuit consuming energy even when there is no audio signal input, thus achieving the purpose of energy saving and improving the service life of the audio power amplifier module.

[0061] like Figure 7As shown, in an optional embodiment of the present invention, the enable circuit module includes:

[0062] The detector circuit is used to detect whether there is an audio signal input.

[0063] The delay circuit has its input connected to the output of the detector circuit and is used to hold the signal detected by the detector circuit for a preset duration.

[0064] The second OR logic circuit has its input terminal connected to the output terminal of the delay circuit. It is used to perform OR logic operations on the enable signal accompanying the input audio signal and the signal output by the delay circuit.

[0065] For example, not all input audio signals are accompanied by an output enable signal. A detection circuit is used to detect the audio signal input. Once an audio signal is detected, the detection circuit is triggered. After triggering, a delay circuit holds the signal detected by the detection circuit, or delays it for a preset time T. After the delay T, the level is restored. The second OR logic circuit performs an OR logic operation on the enable signal accompanying the input audio signal and the signal output by the delay circuit. When at least one audio signal is input, the second OR logic circuit outputs a high level, pulling up the enable terminal of the audio power amplifier module. The audio power amplifier module then amplifies the power of the received coupled audio signal. When there is no input audio signal, i.e., no enable signal, the second OR logic circuit outputs a low level, pulling down or turning off the enable terminal of the audio power amplifier module, and the audio power amplifier module does not work. Specifically, taking a preset duration T = 1s as an example, as long as there is a signal input to the audio signal input module 2, the delay circuit will generate a high level that lasts for 1s. This level will continue until there is no signal input to the audio signal input module 2, and then remain for another 1s. The same applies to the other input branches, and will not be described in detail here.

[0066] The multi-channel audio coupling device provided in this embodiment of the invention detects audio signals without accompanying enable signals using a detection circuit, thereby controlling the audio power amplifier module. A delay circuit maintains the signal detected by the detection circuit for a preset duration, preventing frequent changes in the high and low level signals detected by the detection circuit due to the discontinuity or fluctuation of the audio signal, which could lead to control failure of the audio power amplifier module.

[0067] like Figure 8 As shown, an embodiment of the present invention provides a smart lock, comprising:

[0068] The multi-channel audio coupling device provided in any of the above embodiments.

[0069] This embodiment is similar to the one described above, and will not be repeated here.

[0070] The speaker's input is connected to the output of the audio amplifier module of the multi-channel audio coupler, and is used to play the coupled audio signal output by the multi-channel audio coupler.

[0071] The smart lock provided in this invention reduces the number of speakers to one through a multi-channel audio coupling device, significantly reducing costs, simplifying design complexity, saving space, and increasing the simplicity of the appearance.

[0072] This invention provides a gate, comprising:

[0073] The smart lock provided in any of the above embodiments.

[0074] This embodiment is similar to the description of the corresponding parts in the above embodiments, and will not be repeated here.

[0075] The door provided in this embodiment of the invention significantly reduces costs by using the smart lock provided in any of the above embodiments.

[0076] In the description of this specification, the references to terms such as "this embodiment," "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples, without contradiction. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0077] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A multi-channel audio coupling device, characterized in that, include: Multiple audio signal input modules are used to input audio signals; A coupling circuit module, wherein the input terminal of the coupling circuit module is connected to the output terminal of the plurality of audio signal access modules, and is used to couple the multiple accessed audio signals into a single coupled audio signal and output it; An audio power amplifier module, wherein the input terminal of the audio power amplifier module is connected to the output terminal of the coupling circuit module, is used to amplify the power of the received coupled audio signal; The multi-channel audio coupling device further includes: An enabling circuit module, wherein the input terminal of the enabling circuit module is connected to the output terminal of the plurality of audio signal input modules, and the output terminal of the enabling circuit module is connected to the enabling terminal of the audio power amplifier module, for controlling the audio power amplifier module to respond to the power amplification processing of the received coupled audio signal when any audio signal is input; The enabling circuit module includes: The detector circuit is used to detect whether there is an audio signal input. A delay circuit, wherein the input terminal of the delay circuit is connected to the output terminal of the detection circuit, is used to maintain the signal detected by the detection circuit for a preset duration; The second OR logic circuit, whose input terminal is connected to the output terminal of the delay circuit, is used to perform OR logic operation processing on the enable signal accompanying the input audio signal and the signal output by the delay circuit.

2. The multi-channel audio coupling device according to claim 1, characterized in that, The coupling circuit module includes: A multi-channel filtering circuit, each channel of which is used to denoise the input audio signal; A coupling circuit, wherein the input terminal of the coupling circuit is connected to the output terminal of each filtering circuit, is used to couple the audio signal after noise reduction processing by each filtering circuit into a coupled audio signal for output.

3. The multi-channel audio coupling device according to claim 2, characterized in that, The coupling circuit module further includes: A step-down circuit, located at the front end of the coupling circuit, is used to step down the voltage of each input audio signal.

4. The multi-channel audio coupling device according to claim 3, characterized in that, The step-down circuit is a bidirectional step-down circuit; The filtering circuit is either a band-pass filter circuit or a low-pass filter circuit.

5. The multi-channel audio coupling device according to claim 2, characterized in that, The coupling circuit module further includes: A multi-channel isolation circuit, with each isolation circuit positioned between the filter circuit and the coupling circuit, is used to isolate the audio signal input circuits from each other.

6. A smart lock, characterized in that, include: The multi-channel audio coupling device as described in any one of claims 1-5; A loudspeaker, the input of which is connected to the output of the audio amplifier module of the multi-channel audio coupling device, is used to play the coupled audio signal output by the multi-channel audio coupling device.

7. A door, characterized in that, include: The smart lock as described in claim 6.

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