Bluetooth expansion module and Bluetooth intercom system

Abstract

The utility model discloses a Bluetooth expansion module and a Bluetooth intercom system, comprising an interface unit, a Bluetooth unit, a pickup unit and a control unit, the interface unit is used for connecting an intercom device, the Bluetooth unit is used for connecting a Bluetooth earphone, the pickup unit is used for collecting voice signals, and the control unit is used for controlling the control unit. The control unit is respectively connected with the interface unit, the Bluetooth unit and the pickup unit, has a first working state and a second working state, and is used for receiving and identifying a voice signal from the pickup unit and switching between the first working state and the second working state according to the voice signal; in the first working state, the control unit is used for controlling the interface unit and the Bluetooth unit to be in a communication disconnection state, and in the second working state, the control unit is used for controlling the interface unit and the Bluetooth unit to be in a communication connection state. According to the utility model, talkback communication can be started through voice detection, and the use convenience can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of communication equipment, and particularly relates to a Bluetooth expansion module and a Bluetooth intercom system. Background Art

[0002] As a two-way real-time voice communication tool, the intercom has the advantages of not requiring a network, long distance, clear call, etc., and is widely used in service industries, transportation industries, engineering command, and bicycle self-driving tour communication. Traditional intercoms have some disadvantages in use: they need to keep pressing the PTT (Push-to-Talk) button to conduct intercom communication, have a large volume, heavy weight, etc. Subsequently, Bluetooth intercoms emerged, which can connect the intercom to a Bluetooth headset and conduct intercom through the Bluetooth headset. However, most still need to press the PTT button on the main body of the intercom or add an independent BLE (Bluetooth Low Energy) PTT button to conduct intercom communication, which is inconvenient to use. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a Bluetooth expansion module and a Bluetooth intercom system, which can start intercom communication through voice detection and improve the convenience of use.

[0004] On the one hand, an embodiment of the utility model provides a Bluetooth expansion module, which includes an interface unit, a Bluetooth unit, a sound pickup unit, and a control unit. The interface unit is used to connect to an intercom device, the Bluetooth unit is used to connect to a Bluetooth headset, the sound pickup unit is used to collect voice signals, and the control unit is respectively connected to the interface unit, the Bluetooth unit, and the sound pickup unit. The control unit has a first working state and a second working state. The control unit is used to receive and identify voice signals from the sound pickup unit and switch between the first working state and the second working state according to the voice signals. In the first working state, the control unit is used to control the interface unit and the Bluetooth unit to be in a communication break state. In the second working state, the control unit is used to control the interface unit and the Bluetooth unit to enter a communication path state.

[0005] According to some embodiments of the utility model, the sound pickup unit includes a sound pickup microphone, a first resistor, and a second resistor. The first end of the first resistor is connected to the power supply terminal of the control unit, the second end of the first resistor is connected to the positive electrode of the sound pickup microphone, the first end of the second resistor is connected to the negative electrode of the sound pickup microphone, the second end of the second resistor is connected to the first reference voltage terminal, and the positive and negative electrodes of the sound pickup microphone are respectively connected to the control unit.

[0006] According to some embodiments of the present utility model, a first filter capacitor is connected between the first end of the first resistor and the second end of the second resistor, and a second filter capacitor is connected between the second end of the first resistor and the first end of the second resistor.

[0007] According to some embodiments of the present utility model, a first coupling capacitor is connected between the positive pole of the pickup microphone and the control unit, and a second coupling capacitor is connected between the negative pole of the pickup microphone and the control unit.

[0008] According to some embodiments of the present utility model, the interface unit is a UART unit.

[0009] According to some embodiments of the present utility model, the interface unit is integrated within the control unit.

[0010] According to some embodiments of the present utility model, the Bluetooth unit is integrated within the control unit.

[0011] According to some embodiments of the present utility model, the control unit is further connected to an LED unit.

[0012] According to some embodiments of the present utility model, the control unit is further connected to a voltage stabilizing unit.

[0013] On the other hand, embodiments of the present utility model provide a Bluetooth intercom system, including an intercom device, a Bluetooth headset, and a Bluetooth expansion module as described above.

[0014] Embodiments of the present utility model at least have the following beneficial effects:

[0015] The sound pickup unit is used to collect voice signals, and the control unit switches between a first working state and a second working state according to the voice signals collected by the sound pickup unit, and can start intercom communication through voice detection, which is beneficial to improving the convenience of use.

[0016] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0018] Figure 1 is a schematic block diagram of the Bluetooth intercom system according to an embodiment of the present utility model;

[0019] Figure 2 is a schematic circuit diagram of the sound pickup unit of the Bluetooth expansion module according to an embodiment of the present utility model;

[0020] Figure 3 It is the circuit schematic diagram of the control unit of the Bluetooth expansion module according to an embodiment of the present utility model;

[0021] Figure 4 It is the circuit schematic diagram of the voltage stabilizing unit of the Bluetooth expansion module according to an embodiment of the present utility model.

[0022] Reference numerals:

[0023] Bluetooth expansion module 100, interface unit 110, Bluetooth unit 120, sound pickup unit 130, control unit 140, LED unit 150, voltage stabilizing unit 160, intercom device 200, Bluetooth headset 300. Detailed implementation manners

[0024] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0025] In the description of the present utility model, the meaning of "a number of" is one or more, the meaning of "a plurality of" is more than two, and understandings such as greater than, less than, exceeding, etc. do not include the present number, and understandings such as "above", "below", "within", etc. include the present number. If there is a description of "first", "second", etc., it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0026] In the description of the present utility model, unless otherwise clearly defined, words such as "arrangement", "installation", "connection", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0027] Please refer to Figure 1, this embodiment discloses a Bluetooth expansion module 100, which includes an interface unit 110, a Bluetooth unit 120, a voice pickup unit 130, and a control unit 140. The interface unit 110 is used to connect to an intercom device 200, the Bluetooth unit 120 is used to connect to a Bluetooth headset 300, the voice pickup unit 130 is used to collect voice signals, and the control unit 140 is respectively connected to the interface unit 110, the Bluetooth unit 120, and the voice pickup unit 130. The control unit 140 has a first working state and a second working state. The control unit 140 is used to receive and identify voice signals from the voice pickup unit 130 and switch between the first working state and the second working state according to the voice signals. In the first working state, the control unit 140 is used to control the interface unit 110 and the Bluetooth unit 120 to be in a communication break state. In the second working state, the control unit 140 is used to control the interface unit 110 and the Bluetooth unit 120 to enter a communication path state. Among them, the voice pickup unit 130 is also called a VAD (Voice Activity Detection) unit. When the user speaks, the voice pickup unit 130 can collect the voice signals generated by the user's speech in real time and transmit the collected voice signals to the control unit 140 for identification. If the control unit 140 identifies a key signal in the voice signal, such as the voice signal corresponding to the wake-up word, the control unit 140 controls the start of the communication link between the interface unit 110 and the Bluetooth unit 120, realizing the communication between the intercom device 200 and the Bluetooth headset 300, which can eliminate the cumbersome operation of manually pressing the PTT button and is applicable to scenarios such as cycling intercom.

[0028] In this way, the voice pickup unit 130 is used to collect voice signals, and the control unit 140 switches between the first working state and the second working state according to the voice signals collected by the voice pickup unit 130, and can start the intercom communication through voice detection, which is beneficial to improving the convenience of use.

[0029] Please refer to Figure 2 , the voice pickup unit 130 includes a voice pickup microphone, a first resistor (such as Figure 2 marked as R12 in Figure 2 ) and a second resistor (such as marked as R13 in ). The first end of the first resistor is connected to the power supply end of the control unit 140, the second end of the first resistor is connected to the positive pole of the voice pickup microphone, the first end of the second resistor is connected to the negative pole of the voice pickup microphone, the second end of the second resistor is connected to the first reference voltage end, and the positive and negative poles of the voice pickup microphone are respectively connected to the control unit 140. The working current of the voice pickup microphone is provided by the control unit 140. The first resistor and the second resistor can play a role in current limiting and voltage division, which is beneficial to protecting the voice pickup microphone.

[0030] A first filter capacitor is connected between the first end of the first resistor and the second end of the second resistor (such as Figure 2As shown by the mark C20, a second filter capacitor is connected between the second end of the first resistor and the first end of the second resistor (as shown by the mark C21). The first filter capacitor and the second filter capacitor can filter out interference signals, ensure signal stability, and improve the stability of voice signal detection. Figure 2 As shown by the mark C21). The first filter capacitor and the second filter capacitor can filter out interference signals, ensure signal stability, and improve the stability of voice signal detection.

[0031] A first coupling capacitor is connected between the positive pole of the pickup microphone and the control unit 140 (as shown by the mark C16), and a second coupling capacitor is connected between the negative pole of the pickup microphone and the control unit 140 (as shown by the mark C22). The first coupling capacitor and the second coupling capacitor can realize the coupled transmission of voice signals, reduce the interference of DC signals, and are beneficial to improving the stability of signal transmission. Figure 2 As shown by the mark C16), and a second coupling capacitor is connected between the negative pole of the pickup microphone and the control unit 140 (as shown by the mark C22). The first coupling capacitor and the second coupling capacitor can realize the coupled transmission of voice signals, reduce the interference of DC signals, and are beneficial to improving the stability of signal transmission. Figure 2 As shown by the mark C22). The first coupling capacitor and the second coupling capacitor can realize the coupled transmission of voice signals, reduce the interference of DC signals, and are beneficial to improving the stability of signal transmission.

[0032] Among them, the interface unit 110 is a UART unit. The UART unit is a common interface type and is suitable for most models of the intercom device 200. When in use, the Bluetooth expansion module 100 of this embodiment is used as an independent unit and is plugged into the intercom device 200 through the UART unit, so as to realize function expansion. Please refer to Figure 2 , in this embodiment, the interface unit 110 is integrated in the control unit 140. For example, the 20th and 21st pins of the integrated chip U1 are used as the input and output pins of the UART unit, which can improve the integration of the circuit, thereby reducing the circuit structure and realizing the miniaturized design of the Bluetooth expansion module 100. Similarly, the Bluetooth unit 120 is integrated in the control unit 140. For example, the 16th pin of the integrated chip U1 is used as the input and output pin of the Bluetooth unit 120, and a small number of electronic components (such as Figure 2 As shown by the marks L5, C6, L6, D1 and A1) can be arranged around the control unit 140 to realize Bluetooth communication, which is beneficial to simplifying the circuit and reducing the circuit cost.

[0033] In addition, please refer to Figure 1 , the control unit 140 is also connected to the LED unit 150. When the control unit 140 switches to the second working state, the control unit 140 controls the LED unit 150 to light up, thereby prompting the user that normal intercom is possible. The control unit 140 is also connected to a voltage stabilizing unit 160. The voltage stabilizing unit 160 is used to provide a stable working current for the control unit 140. The circuit schematic diagram of the voltage stabilizing unit 160 is as shown in Figure 4 .

[0034] Please refer to Figure 1, this embodiment provides a Bluetooth intercom system, including an intercom device 200, a Bluetooth headset 300, and the Bluetooth expansion module 100 as described above. The structure of the Bluetooth expansion module 100 can be referred to above and will not be elaborated here. The sound pickup unit 130 is used to collect voice signals, and the control unit 140 switches between the first working state and the second working state according to the voice signals collected by the sound pickup unit 130, and can start intercom communication through voice detection, which is beneficial to improving the convenience of use.

[0035] The above has described the embodiments of the present invention in detail with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A Bluetooth expansion module, characterized in that, include: An interface unit (110) for connecting to an intercom device (200); A Bluetooth unit (120), used for connecting to a Bluetooth headset (300); A sound pickup unit (130), used for collecting voice signals; A control unit (140) is connected to the interface unit (110), the Bluetooth unit (120) and the sound pickup unit (130) respectively, the control unit (140) having a first working state and a second working state, the control unit (140) being used to receive and identify a voice signal from the sound pickup unit (130) and to switch between the first working state and the second working state according to the voice signal, in the first working state the control unit (140) being used to control the interface unit (110) and the Bluetooth unit (120) to be in a communication disconnection state, and in the second working state the control unit (140) being used to control the interface unit (110) and the Bluetooth unit (120) to enter a communication path state.

2. The Bluetooth expansion module according to claim 1, wherein The sound pickup unit (130) comprises a sound pickup microphone, a first resistor and a second resistor, wherein the first end of the first resistor is connected to the power supply end of the control unit (140), the second end of the first resistor is connected to the positive electrode of the sound pickup microphone, the first end of the second resistor is connected to the negative electrode of the sound pickup microphone, the second end of the second resistor is connected to the first reference voltage end, and the positive electrode and the negative electrode of the sound pickup microphone are respectively connected to the control unit (140).

3. The Bluetooth expansion module according to claim 2, wherein A first filter capacitor is connected between the first end of the first resistor and the second end of the second resistor, and a second filter capacitor is connected between the second end of the first resistor and the first end of the second resistor.

4. The Bluetooth expansion module according to claim 2 or 3, characterized in that, A first coupling capacitor is connected between the positive electrode of the sound pickup microphone and the control unit (140), and a second coupling capacitor is connected between the negative electrode of the sound pickup microphone and the control unit (140).

5. The Bluetooth expansion module according to claim 1, characterized in that, The interface unit (110) is a UART unit.

6. The Bluetooth expansion module according to claim 1 or 5, characterized in that The interface unit (110) is integrated into the control unit (140).

7. The Bluetooth expansion module according to claim 1, wherein The Bluetooth unit (120) is integrated into the control unit (140).

8. The Bluetooth expansion module according to claim 1, wherein The control unit (140) is also connected to an LED unit (150).

9. The Bluetooth expansion module according to claim 1, wherein The control unit (140) is also connected to a voltage stabilizing unit (160).

10. A Bluetooth intercom system, characterized in that, It comprises an intercom device (200), a Bluetooth headset (300), and a Bluetooth expansion module (100) as claimed in any one of claims 1 to 9.

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