Microphone device and audio processing system

Abstract

The present invention discloses a microphone device and an audio processing system, wherein the microphone device comprises a DSP unit, a pickup connected to the DSP unit, and an audio signal processing circuit; the audio signal processing circuit is connected to a transducer circuit, and the transducer circuit is connected to a signal output interface and a power supply circuit for powering the microphone device; the transducer circuit is used to convert the voltage of a phantom power supply from a signal line introduced by the signal output interface into an input voltage of a power supply circuit for powering the microphone device, and to convert an analog microphone signal from the audio signal processing circuit into a differential signal and transmit it to the signal output interface for output. The microphone device of the present invention greatly improves the signal-to-noise ratio of voice collection.

Description

Technical Field

[0001] The present invention relates to the technical field of microphones, and in particular to a microphone device and an audio processing system. Background Art

[0002] Microphone, scientifically known as microphone, also known as microphone, pickup, is an energy conversion device that converts sound signals into electrical signals. Microphone products are generally divided into two categories: one is digital microphone devices, and the second is analog microphone devices. Digital microphone devices can generally achieve sound noise reduction, but due to the inherent signal transmission limitations, the connection line between the microphone and the audio processing equipment can only be very short to ensure the integrity of the signal transmission. Analog microphone devices use an external phantom power supply to allow their microphone signals to be transmitted over a longer distance, but the internal signal processing of existing analog microphone devices is all analog circuits, and the signal-to-noise ratio is relatively low, and it is impossible to perform noise reduction and other processing on the collected signals. Summary of the invention

[0003] The purpose of the present invention is to provide a microphone device and an audio processing system which are highly versatile, low-cost, have a digital processing circuit and can achieve long-distance transmission in order to address the technical defects in the prior art.

[0004] In a first aspect, the present invention provides a microphone device, comprising a DSP unit and a pickup and an audio signal processing circuit connected to the DSP unit; the audio signal processing circuit is connected to a transducer circuit, and the transducer circuit is connected to a signal output interface and a power supply circuit for powering the microphone device; the transducer circuit is used to convert the voltage of a phantom power supply from a signal line introduced by the signal output interface into an input voltage of the power supply circuit to power the microphone device, and to convert an analog microphone signal from the audio signal processing circuit into a differential signal and transmit it to the signal output interface for output.

[0005] Preferably, the transducer circuit comprises a transformer, the primary winding of the transformer is connected to the signal output interface, and the secondary winding is connected to the signal output end of the audio signal processing circuit;

[0006] The primary winding tap of the transformer is connected to the input end of the power supply circuit via a diode, so that the phantom voltage from the signal line is taken out from the primary winding tap of the transformer and converted into a stable DC voltage VCC through the diode as the input voltage of the power supply circuit.

[0007] Preferably, the pin definition of the signal output interface is consistent with that of the analog output microphone output interface.

[0008] Preferably, the audio signal processing circuit is used to filter, amplify, and balance the single-ended analog signal processed by the DSP unit, and convert it into an analog microphone signal to output to the transducer circuit.

[0009] Preferably, the DSP unit is used to process the signal from the microphone, including noise reduction, sound source localization, and beam forming.

[0010] Preferably, the pickup is one or more and is electrically connected to the signal input terminal of the DSP unit.

[0011] A second aspect of the present invention provides an audio processing system, comprising a microphone device and an audio host connected to the microphone device via a cable, wherein the microphone device adopts the microphone device described in the first aspect of the present invention, and after the microphone device is connected to the audio host via the cable, the phantom power supply of the audio host supplies power to the microphone device through the transducer circuit.

[0012] Preferably, the audio host is used to convert the signal from the microphone device to achieve audio processing and output in different scenarios, including speaker output, line output, digital audio output or audio upload output.

[0013] The microphone device of the present invention has a digital processing unit that can reduce noise and beamform voice signals, realize high-fidelity collection of voice signals, improve the signal-to-noise ratio of the system, and reduce the signal processing difficulty and task volume of the audio host. Compared with analog microphones, the microphone device of the present invention greatly improves the signal-to-noise ratio of voice collection, has strong versatility, and can directly replace traditional analog output microphones.

[0014] The audio processing system of the present invention uses the microphone device of the present invention, and its audio host does not need to have any microphone signal processing algorithm, which greatly reduces the cost of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the principle of a microphone device according to an embodiment of the present invention.

[0016] Figure 2 This is a circuit diagram of an audio signal processing circuit input and signal output by a transducer circuit according to an embodiment of the present invention.

[0017] Figure 3 This is a circuit diagram of a converter circuit according to an embodiment of the present invention that converts a phantom voltage into a DC voltage VCC.

[0018] Figure 4 is a schematic diagram of an audio processing system according to an embodiment of the present invention;

[0019] Figure 5This is a waveform comparison diagram of the microphone device and the module microphone according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] The microphone device of the present invention has a digital processing circuit and can realize long-distance transmission through analog signals; in addition, the phantom power is converted into the power supply of the device through the transducer circuit, without the need for a separate power supply, and the single-ended audio signal is converted into a differential signal output.

[0022] According to a first aspect of an embodiment of the present invention, a microphone device is provided, comprising a DSP unit and a pickup and an audio signal processing circuit connected to the DSP unit; the audio signal processing circuit is connected to a transducer circuit, and the transducer circuit is connected to a signal output interface and a power supply circuit for powering the microphone device; the transducer circuit is used to convert the voltage of a phantom power supply from a signal line introduced by the signal output interface into an input voltage of the power supply circuit for powering the microphone device, and to convert an analog microphone signal from the audio signal processing circuit into a differential signal for transmission to the signal output interface for output.

[0023] The above-mentioned DSP unit, pickup, audio signal processing circuit, transducer circuit, and signal output interface are integrated on a circuit main board, and a debugging interface is provided to connect with the DSP unit. The debugging interface is used to download program debugging for the device. Its functions and effects are not described in detail here, and it is the prior art.

[0024] As an optional embodiment, the transducer circuit includes a transformer, the primary winding of the transformer is connected to the signal output interface, and the secondary winding is connected to the signal output end of the audio signal processing circuit;

[0025] The primary winding tap of the transformer is connected to the input end of the power supply circuit via a diode, so that the phantom voltage from the signal line is taken out from the primary winding tap of the transformer and converted into a stable DC voltage VCC through the diode as the input voltage of the power supply circuit.

[0026] Specifically, Figure 3 As shown, the positive pole of the secondary winding of the transformer is connected to the input signal and the negative pole is connected to AGND, the positive pole and negative pole of the primary winding are connected to the "+" and "-" pins of the signal output interface respectively, pin 3 of the signal output interface is grounded, and the "+" and "-" pins of the signal output interface are respectively connected to AGND through a capacitor.

[0027] As an optional embodiment, the signal output interface has the same pin definition as the analog output microphone output interface, and can directly replace a traditional analog output microphone.

[0028] As an optional embodiment, the audio signal processing circuit is used to filter, amplify, and balance the single-ended analog signal processed by the DSP unit to improve the quality and anti-interference ability of the output signal, and convert it into an analog microphone signal to output to the transducer circuit. It is a prior art circuit, such as Figure 3 As shown, it may include a transistor Q, resistors R1, R2, R3, a capacitor C1, an electrolytic capacitor C2, an electrolytic capacitor C3 and a diode D1, one end of the capacitor C1 is connected to the DSP signal, and the other end is connected to one end of the resistor R1 and the base of the transistor Q, the emitter of the transistor Q is connected to the resistor R3 and then to AGND, and is connected to the electrolytic capacitor C3, the other end of the electrolytic capacitor C3 is connected to one end of the energy conversion circuit (i.e., the grounding end of the secondary winding of the transformer), the collector of the transistor Q is connected to one end of the resistor R1 and one end of the resistor R1, the other end of the resistor R2 is connected to the electrolytic capacitor C2 and one end of the diode D1 in parallel and is connected to the input end of the energy conversion circuit (i.e., the input end of the secondary winding of the transformer), and the other ends of the parallel electrolytic capacitor C2 and the diode D1 are grounded.

[0029] As an optional embodiment, the DSP unit is used to process the signal from the pickup, including noise reduction, sound source localization, and beam forming, and then transmit it to the audio signal processing circuit for processing, and the audio signal processing circuit converts it into an analog signal and outputs it to the transducer circuit.

[0030] As an optional embodiment, the pickup is one or more and is electrically connected to the signal input terminal of the DSP unit.

[0031] In a second aspect of the present invention, an audio processing system is provided, comprising a microphone device and an audio host connected to the microphone device via a cable, Figure 4 As shown, the audio host is connected to the signal output interface of the microphone through an electrical connection line, such as a cable, through its microphone interface. The microphone device adopts the microphone device described in the first aspect of the present invention. After the microphone device is connected to the audio host via the cable, the phantom power of the audio host supplies power to the microphone device through the transducer circuit.

[0032] In specific implementation, one end of the cable is connected to the signal output interface of the microphone device, and the other end of the cable is connected to the audio host. The audio host converts the signal from the microphone device to achieve audio processing and output in different scenarios, including but not limited to speaker output, line output, digital audio output, and audio upload output. After the cable is connected, the phantom power supply of the audio host can power the entire microphone device, the system starts working, and the sound signal from the outside is output to the audio host through the microphone device via the cable for audio signal conversion processing.

[0033] The microphone device of the present invention has a digital processing unit that can reduce noise and beamform voice signals, realize high-fidelity collection of voice signals, improve the signal-to-noise ratio of the system, and reduce the signal processing difficulty and task volume of the audio host. Compared with analog microphones, the microphone device of the present invention greatly improves the signal-to-noise ratio of voice collection, has strong versatility, and can directly replace traditional analog output microphones.

[0034] The audio processing system of the present invention uses the microphone device of the present invention, and its audio host does not need to have any microphone signal processing algorithm, which greatly reduces the cost of the entire system.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A microphone device, comprising a DSP unit, a pickup connected to the DSP unit, and an audio signal processing circuit; characterized in that: The audio signal processing circuit is connected to the transducer circuit, and the transducer circuit is connected to the signal output interface and the power supply circuit for powering the microphone device; the transducer circuit is used to convert the voltage of the phantom power supply from the signal line introduced by the signal output interface into the input voltage of the power supply circuit to power the microphone device, and convert the analog microphone signal from the audio signal processing circuit into a differential signal and transmit it to the signal output interface for output; after the microphone device is connected to the audio host via a cable, the phantom power supply of the audio host powers the microphone device through the transducer circuit; The DSP unit is used to process the signal from the microphone, including noise reduction, sound source localization, and beam forming; The audio signal processing circuit is used to filter, amplify, and balance the signal processed by the DSP unit, and convert it into an analog microphone signal to output to the transducer circuit; The audio signal processing circuit includes a transistor Q, resistors R1, R2, R3, a capacitor C1, an electrolytic capacitor C2, an electrolytic capacitor C3 and a diode D1, one end of the capacitor C1 is connected to the DSP signal, and the other end is connected to one end of the resistor R1 and the base of the transistor Q, the emitter of the transistor Q is connected to the resistor R3 and then to AGND, and is connected to the electrolytic capacitor C3, the other end of the electrolytic capacitor C3 is connected to one end of the transducer circuit, the collector of the transistor Q is connected to one end of the resistor R1 and one end of the resistor R2, the other end of the resistor R2 is connected to the electrolytic capacitor C2 and one end of the diode D1 connected in parallel and is connected to the input end of the transducer circuit, and the other ends of the parallel electrolytic capacitor C2 and the diode D1 are grounded; The transducer circuit includes a transformer, the primary winding of the transformer is connected to the signal output interface, and the secondary winding is connected to the signal output end of the audio signal processing circuit; The primary winding tap of the transformer is connected to the input end of the power supply circuit via a diode, so that the phantom voltage from the signal line is taken out from the primary winding tap of the transformer and converted into a stable DC voltage VCC through the diode as the input voltage of the power supply circuit.

2. The microphone device according to claim 1, characterized in that: The pin definition of the signal output interface is consistent with the pin definition of the analog output microphone output interface.

3. The microphone device according to claim 1, characterized in that: The pickup is one or more and is electrically connected to the signal input terminal of the DSP unit.

4. An audio processing system, comprising a microphone device and an audio host connected to the microphone device via a cable, characterized in that: The microphone device adopts the microphone device according to any one of claims 1 to 3. After the microphone device is connected to the audio host via the cable, the phantom power supply of the audio host supplies power to the microphone device through the transducer circuit.

5. The audio processing system according to claim 4, characterized in that: The audio host is used to convert the signal from the microphone device to achieve audio processing and output in different scenarios, including speaker output, line output, digital audio output or audio upload output.

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