CN215345042U

CN215345042U - Mobile sound card with microphone digital transmission and analog transmission interfaces

Info

Publication number: CN215345042U
Application number: CN202121316373.1U
Authority: CN
Inventors: 杨志豪; 聂树兴
Original assignee: Guangdong Takstar Electronic Co ltd
Current assignee: Guangdong Takstar Electronic Co ltd
Priority date: 2021-06-11
Filing date: 2021-06-11
Publication date: 2021-12-28
Anticipated expiration: 2031-06-11

Abstract

The utility model relates to a mobile sound card with a microphone digital transmission interface and an analog transmission interface, which comprises a power supply circuit, a voltage boosting circuit, a voltage reducing circuit, an audio processing circuit, a digital signal input circuit and an analog signal input circuit, wherein the voltage boosting circuit and the voltage reducing circuit are both connected with the power supply circuit, the voltage boosting circuit is connected with the analog signal input circuit and then connected with the audio processing circuit, and the voltage reducing circuit is connected with the digital signal input circuit and then connected with the audio processing circuit. Through having microphone digital signal input circuit and analog signal input circuit concurrently, can satisfy the demand of different use scenes for the universality of mobile sound card is stronger, can satisfy the demand of more application scenes.

Description

Mobile sound card with microphone digital transmission and analog transmission interfaces

Technical Field

The utility model relates to the field of audio processing, in particular to a mobile sound card with a microphone digital transmission interface and an analog transmission interface.

Background

With the continuous development of the live broadcast industry, requirements for equipment are gradually different for different types of broadcasters, for a common main broadcaster, the microphone can meet a series of requirements for clear recording, distortion prevention and the like, and for some singing main broadcasters or other main broadcasters with higher requirements for sound, the requirements for the equipment, particularly for the clear recording of the microphone and the complete effect of high-frequency-band recording are improved. The existing equipment generally records analog signals with a current common microphone due to a processing mode, and performs common sound processing through logic of analog-to-digital conversion by a sound card. One of the technical routes for higher requirements on sound is to perform analog-to-digital conversion directly in the integrated microphone after recording through a complete microphone, because the compression and demodulation of the analog signal are completed in the same equipment, more details of high frequency and low frequency can be kept in the conversion, so that the sound is more complete, namely, the analog-to-digital conversion can be completed in the microphone stage, the microphone directly outputs a digital signal, and the output signal has good anti-interference performance and good fidelity effect.

However, with this kind of technical route, the prior art usually uses a dedicated sound card for receiving the digital signal transmitted by the associated microphone, which results in expensive equipment, poor universality, and only a single dedicated device to dedicated device, and only a single function can be used after the user purchases the device.

SUMMERY OF THE UTILITY MODEL

The utility model provides a mobile sound card with a microphone digital transmission interface and an analog transmission interface, which aims to solve the technical problems and comprises a power supply circuit, a boosting circuit, a voltage reducing circuit, an audio processing circuit, a digital signal input circuit and an analog signal input circuit, wherein the boosting circuit and the voltage reducing circuit are both connected with the power supply circuit, the boosting circuit is connected with the analog signal input circuit and then connected with the audio processing circuit, and the voltage reducing circuit is connected with the digital signal input circuit and then connected with the audio processing circuit. Through addding dedicated step-down power supply circuit and analog signal input circuit for the numerical value signal that digital microphone output also can be received to the removal sound card, makes the removal sound card can increase the scope of using, makes the user use the different microphone of a sound card adaptation alone, in order to satisfy actual needs.

Preferably, the boost circuit comprises a boost chip U6, the 2 terminal of the U6 is connected with the power circuit, the 2 terminal is connected with the C22 and then grounded, an inductor L2 is connected in parallel between the 2 terminal and the 6 terminal of the U6, and the 6 terminal of the U6 is connected with the analog signal input circuit. The purpose of adding inductor L2 is to make it oscillate in frequency and generate electromotive force to achieve the purpose of boosting.

Preferably, the end 6 of the U6 is externally connected with D3, the output end of the D3 is connected with a magnetic bead, and the magnetic bead is connected with an analog signal input circuit. The diode D3 is added to prevent the current and voltage from "flowing backward", and the output voltage is supplied back to the U6 chip through the inductor L2.

Preferably, the output end of the D3 is respectively connected with C16, C17 and CE3 and then respectively connected with ground. After the voltage is boosted, the inductor boost generates a certain frequency, so that the output power can interfere with the power along with some frequencies, filtering is required to be performed on some frequency wavelengths, and after the diode D3 is rectified and passes through C17, C16 and CE3, filtering of high-pass and low-pass multi-stage can be completed.

Preferably, the voltage reduction circuit comprises a voltage reduction chip U9, the 4 end of the U9 is connected with the power supply circuit through R50, and the 3 end of the U9 is connected with the L6 and the R51 in sequence and then is connected with the digital signal input circuit. After voltage reduction, the voltage reduction is connected with L6 to remove noise, and meanwhile, amplitude limiting is carried out through R51, so that the completeness and cleanness of signals can be guaranteed.

Preferably, C32 and C33 are connected in parallel between L6 and R51, and the C32 and C33 are grounded. The effect of filtering can be achieved by matching the C32 with the C33.

Preferably, the digital signal input circuit comprises a digital processing chip U19, the U19 is connected with a voltage reduction circuit, the numerical input terminals D1 and D2 are respectively connected with the U19 after being connected with R145 and R146 in series, and the U19 is connected with an audio processing circuit. In the digital signal input circuit, only the input numerical value signal needs to be subjected to amplitude limiting by using a resistor, and the digital signal is output, so that the digital signal can be directly introduced into a chip for processing.

The utility model has the following technical effects:

1. has digital transmission and analog transmission interfaces and is convenient to use. The connection problem of using different microphones under different scenes can be met, so that the universality of the sound card is stronger, and the use cost of high-end equipment is reduced.

2. The digital transmission interface and the analog transmission interface are independent from each other, and signals are not influenced. Because the power supply of digital transmission and analog transmission are mutually independent, and the signal transmission mode has a set of circuits which are independent and complete, the two circuits are not influenced by each other, and the audio processing circuit can independently transmit information.

3. Can be used simultaneously, as a supplement to the use of multiple input scenarios. The two interfaces are mutually independent, so that the audio input of a plurality of microphones can be realized under the condition that a plurality of microphones are required to input, and more applicable scenes are met.

Drawings

Fig. 1 is a circuit module connection block diagram in embodiment 1 of this patent.

Fig. 2 is a circuit diagram of a booster circuit in embodiment 1 of this patent.

Fig. 3 is a circuit diagram of the step-down circuit in embodiment 1 of this patent.

Fig. 4 is a circuit diagram of a digital signal input circuit in embodiment 1 of this patent.

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the utility model easier to understand for those skilled in the art and will therefore make the scope of the utility model more clearly defined.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "head", "tail", and the like, indicate orientations and positional relationships based on those shown in the drawings, are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Example 1:

in this embodiment, as shown in fig. 1, the sound card includes a power circuit, a voltage boosting circuit, a voltage dropping circuit, an audio processing circuit, a digital signal input circuit, and an analog signal input circuit, and certainly, the sound card also includes other functional circuits, but as the prior art, the other functional circuits are not repeated again, and in this embodiment, only the aspects of the circuits related to the mobile sound card subject having both the microphone digital transmission interface and the analog transmission interface are described.

In the overall configuration, the power supply circuit supplies power to the voltage step-up circuit and the voltage step-down circuit, the voltage step-up circuit supplies power to the analog signal input circuit, and the voltage step-down circuit supplies power to the digital signal input circuit. The analog signal input circuit performs analog-to-digital conversion on an analog signal acquired from the input equipment, and the analog signal is finally converted into a digital signal and output to the audio processing circuit; the digital signal input circuit directly obtains the processed numerical value from the input equipment, and outputs the numerical value to the audio processing circuit after simple amplitude limiting processing. From the structural description, the analog signal input circuit and the digital signal input circuit are relatively independent and are distinguished from each other on the power supply, so that the analog signal input circuit and the digital signal input circuit can operate independently and do not interfere with each other.

In a specific booster circuit, as shown in fig. 2, a booster chip U6 is adopted, the input end of U6 is a 2-terminal, and the input voltage is filtered through C22 to reduce noise; the grounding of the enabling end 3 of the U6 ensures that the chip is long-passed. L2 is connected in parallel with the chip between the 2 terminal and the 6 terminal of the chip, and the purpose of adding the inductor L2 is to make the chip vibrate in frequency and generate electromotive force to realize the purpose of boosting. The diode D3 is connected outside the output end 6, the D3 is used for preventing current and voltage from flowing backwards, and the output voltage is supplied to the U6 chip again through the inductor L2. The output end of the diode D3 is grounded after being connected with the C16, grounded with the C17 and grounded with the C23, and the purpose is that the output voltage is interfered with the output voltage along with certain frequency because the inductance boosting generates certain frequency, so that the multi-stage filtering of the C16, the C17 and the C23 is required.

In the voltage reduction circuit, as shown in fig. 3, a voltage reduction chip U9 is adopted, an input voltage is grounded after passing through R50 and then connected with C31 for filtering, R50 is simultaneously connected with the input end 4 of U9, an enable end 1 is connected with an external switch circuit, an output end is connected with an inductor L6 and then connected with a resistor R51, and capacitors C32 and C33 which are connected in parallel with each other are further connected between L6 and R51, so that the filtering effect is realized.

In the digital signal input circuit, as shown in fig. 4, a digital processing chip U19 is adopted, digital signals are input through D1 and D2, and digital input terminals D1 and D2 are respectively connected in series with R145 and R146 and then connected with U19. In the digital processing chip, the voltage reduction circuit is connected by receiving the output voltage in the voltage reduction circuit, and the 3.3V output by the voltage reduction circuit is connected with the U19 through a peripheral circuit of the U19 for power supply.

The digital processing chip U19 processes the acquired digital signal and transmits the processed digital signal to the audio processing circuit for processing.

It is understood that different embodiments among the components in the above embodiments can be combined and implemented, and the embodiments are only for illustrating the implementation of specific structures and are not limited to the implementation of the embodiments.

The parameters of each circuit component in this embodiment are as follows: u6 is SGM6601YTDI6G/TR, C22 is 100nF, L2 is CSMRH74-4R7M, D3 is 1N5819, C17 is 100nF, C16 is 1uF, C23 is 22uF, U9 is SGM6012-ADJYTN5G/TR, C31 is 4.7uF, R50 is 0R, R51 is 1K, L6 is 2.2uH, C32 is 10uF, C33 is 100nF, U19 is CS5340-CZZR, R145 is 1K, and R146 is 1K.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims

1. A mobile sound card with a microphone digital transmission interface and an analog transmission interface is characterized by comprising a power supply circuit, a boosting circuit, a voltage reduction circuit, an audio processing circuit, a digital signal input circuit and an analog signal input circuit, wherein the boosting circuit and the voltage reduction circuit are both connected with the power supply circuit, the boosting circuit is connected with the analog signal input circuit and then connected with the audio processing circuit, and the voltage reduction circuit is connected with the digital signal input circuit and then connected with the audio processing circuit.

2. The mobile sound card with the microphone digital transmission and analog transmission interfaces as claimed in claim 1, wherein the voltage boost circuit comprises a voltage boost chip U6, the 2 terminal of the U6 is connected with a power circuit, the 2 terminal is connected with C22 and then grounded, an inductor L2 is connected in parallel between the 2 terminal and the 6 terminal of the U6, and the 6 terminal of the U6 is connected with an analog signal input circuit.

3. The mobile sound card with the interface of both digital transmission and analog transmission of microphone as claimed in claim 2, wherein the diode D3 is connected to the outside of the terminal 6 of the U6, the output terminal of the diode D3 is connected to the magnetic bead, and the magnetic bead is connected to the analog signal input circuit.

4. The mobile sound card with both digital transmission and analog transmission interfaces of microphone as claimed in claim 3, wherein the output terminal of the diode D3 is connected to the capacitor C16, the capacitor C17 and the capacitor CE3 respectively, and then connected to ground respectively.

5. The mobile sound card with the microphone digital transmission and analog transmission interfaces as claimed in claim 1, wherein the voltage reduction circuit includes a voltage reduction chip U9, the 4 end of the U9 is connected to the power circuit through a resistor R50, and the 3 end of the U9 is connected to the digital signal input circuit after being connected to an inductor L6 and a resistor R51 in sequence.

6. The mobile sound card with both digital transmission and analog transmission interfaces of microphone as claimed in claim 5, wherein a capacitor C32 and a capacitor C33 are connected in parallel between the inductor L6 and the resistor R51, and the capacitors C32 and C33 are grounded.

7. The mobile sound card with both digital transmission and analog transmission interfaces of microphone according to claim 1, wherein the digital signal input circuit comprises a digital processing chip U19, the U19 is connected with a voltage reduction circuit, and further comprises digital inputs D1 and D2, the digital inputs D1 and D2 are respectively connected with a resistor R145 and a resistor R146 in series and then connected with a U19, and the U19 is connected with an audio processing circuit.