A mixing device with bluetooth fm radio function

Abstract

The utility model provides a kind of sound mixing device of bluetooth FM radio function, including signal input unit, sound mixing processing unit, front-stage amplification unit, filter circuit unit, rear-stage power amplification unit, audio playback unit;At least one signal input unit input digital audio signal is mixed sound after being handled by sound mixing processing unit, amplifies by front-stage amplification unit, then is filtered by filter circuit unit, amplifies by rear-stage power amplification unit after entering audio playback unit and plays;The input unit includes bluetooth receiving module, digital FM radio unit and at least one microphone.The utility model uses digitization, high intelligentization, integrated chip, product volume is small, electrical performance is good.

Description

Technical Field

[0001] This utility model relates to the field of Bluetooth FM radio mixing devices. Background Technology

[0002] A mixing amplifier is an electronic device whose main function is to mix multiple audio signals and amplify them before outputting them to speakers or other audio output devices. Mixing amplifiers play a crucial role in music production, live performances, broadcasting, and film and television post-production.

[0003] Existing mixer amplifiers, power amplifiers, and preamplifier circuits are all analog, with scattered components and excessive and complex control circuits. Performance is inevitably inconsistent and unstable, and there are too many wiring connections, resulting in high power consumption and low energy efficiency. Utility Model Content

[0004] This invention addresses the shortcomings of current mixing amplifiers, power amplifiers, and preamplifier circuits, which are mostly analog, have scattered components, excessive and complex control circuits, inevitably suffer from performance deviations and instability, have too many wiring connections, high power consumption, and low energy efficiency. It provides a mixing device with Bluetooth FM radio functionality.

[0005] The technical solution adopted by this utility model to achieve its technical objective is as follows: a mixing device with Bluetooth FM radio function, including a signal input unit, a mixing processing unit, a pre-amplifier unit, a filtering circuit unit, a power amplifier unit, and an audio playback unit; the digital audio signal input from at least one signal input unit is mixed by the mixing processing unit, amplified by the pre-amplifier unit, filtered by the filtering circuit unit, amplified by the power amplifier unit, and then played by the audio playback unit; the input unit includes a Bluetooth receiver module, a digital FM radio unit, and at least one microphone.

[0006] Furthermore, in the aforementioned Bluetooth FM radio mixing device: the Bluetooth receiving module and the digital FM radio unit form two background music input ports.

[0007] Furthermore, in the aforementioned Bluetooth FM radio mixing device: the Bluetooth receiving module has a built-in BLE4.2 Bluetooth audio module that supports AVRCP1.4 and A2DP1.2 protocols.

[0008] Furthermore, in the aforementioned Bluetooth FM radio mixing device: the digital FM radio unit is equipped with an FM antenna to receive and demodulate FM broadcast signals.

[0009] Furthermore, in the above-mentioned Bluetooth FM radio mixing device: the mixing processing unit performs mixing processing on audio signals from different input sources, providing flexible audio source switching and mixing, wherein the input sources include digital audio signals input from the input unit.

[0010] Furthermore, in the above-mentioned Bluetooth FM radio mixing device: the preamplifier unit uses an operational amplifier to perform preliminary voltage amplification on the audio signal to improve the signal strength, and the operational amplifier includes an operational amplifier with model number NE5532.

[0011] Furthermore, in the above-mentioned mixing device for Bluetooth FM radio function: the filtering circuit unit includes a filtering unit and a limiting unit.

[0012] Furthermore, in the aforementioned Bluetooth FM radio mixing device: the post-amplification unit uses a high-power audio amplifier chip to further amplify the signal amplified by the pre-amplification stage to the power level required to drive the audio playback unit.

[0013] Furthermore, in the aforementioned Bluetooth FM radio mixing device, the high-power audio amplifier chip includes either LM3886 or TPA3255DDV.

[0014] Furthermore, in the aforementioned Bluetooth FM radio mixing device: the audio playback unit includes a speaker.

[0015] This invention uses a digital, highly intelligent, and integrated chip, resulting in a product that is small in size and has good electrical performance.

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0017] Appendix Figure 1 This is a block diagram illustrating the principle of the mixing device for Bluetooth FM radio function in Embodiment 1 of this utility model.

[0018] Appendix Figure 2 This is a schematic diagram of the power amplifier used in Embodiment 1 of this utility model. Detailed Implementation

[0019] Example 1 This example is a mixing device with Bluetooth FM radio function, such as Figure 1As shown, the device includes a signal input unit, a mixing unit, a preamplifier unit, a filtering circuit unit, a power amplifier unit, an audio playback unit, a control unit, and a user interface. The user interface is used to operate the device, and the control unit executes the operations received from the user interface. In this embodiment, at least one digital audio signal input from the signal input unit is mixed by the mixing unit. In this embodiment, the Bluetooth receiver module and the digital FM radio unit form two background music input ports and digital audio signals input from the digital microphone. These signals are amplified by the preamplifier unit, filtered by the filtering circuit unit, amplified by the power amplifier unit, and then played back by the audio playback unit. The audio playback unit generally includes a speaker, loudspeaker, etc.

[0020] In this embodiment:

[0021] The Bluetooth receiver module has a built-in BLE4.2 Bluetooth audio module that supports AVRCP1.4 and A2DP1.2 protocols.

[0022] The digital FM radio unit is equipped with an FM antenna to receive and demodulate FM radio signals.

[0023] The mixing processing unit performs mixing processing on audio signals from different input sources, providing flexible audio source switching and mixing, wherein the input sources include digital audio signals input from the input unit.

[0024] The preamplifier unit uses an operational amplifier to perform preliminary voltage amplification on the audio signal and improve the signal strength. The operational amplifier includes an operational amplifier with model number NE5532.

[0025] The filter circuit unit includes a filter unit and a limiting unit.

[0026] The power amplifier stage uses a high-power audio amplifier chip to further amplify the signal from the preamplifier stage to the power level required to drive the audio playback unit. Here, the high-power audio amplifier chip includes models such as LM3886 or TPA3255DDV. The audio playback unit includes a speaker. The circuit schematic when using the TPA3255DDV high-power audio amplifier chip is shown below. Figure 2 As shown.

[0027] This embodiment is an energy-saving 240W Bluetooth FM radio mixing device, featuring two microphone inputs and two background music (AUX / MP3 player selectable) input ports. The preamplifier signal is filtered and limited by volume / priority analog processing before being output to the power amplifier. The power amplifier is a Class D amplifier. It is a standard 1U multi-channel input digital mixing amplifier with dual-channel independent control, configurable as a mono constant voltage 100V / 70V output and a mono constant impedance 4-ohm output. This energy-saving 240W Bluetooth FM radio mixing amplifier has a 240W output specification.

[0028] This embodiment is a miniature digital power amplifier designed to replace traditional Class AB power amplifiers. It requires high intelligence, integration, small size, and electrical performance comparable to Class A or Class AB amplifiers. It replaces the traditional linear transformer power supply with a switching power supply. The power supply range is upgraded from low / high voltage (115 / 230VAC) input to a wide input voltage range (100V-240VAC), and the overall efficiency is improved from below 40% for Class AB amplifiers to over 65%.

[0029] In this embodiment, the preamplifier input of the energy-saving Bluetooth FM radio function 240W mixer amplifier includes BGM (MP3 player, AUX input, switchable input) and microphone input (microphone 1~2, microphone 1 has priority). The preamplifier signal is amplified and processed by volume / priority analog signal before entering the power amplifier stage.

[0030] Energy-saving 240W Bluetooth FM radio mixer power supply: 1 / 8W continuous output power, full-power switching power supply. It can meet a wide input voltage range of AC90~263V, with a full-power efficiency of 89%~90% and a power factor of over 0.9 at full-power output. Output voltages include standby voltage, preamp voltage, and main voltage output, and it features soft-start functionality.

[0031] This energy-saving Bluetooth FM radio function 240W mixing amplifier features power amplification: the power amplification section is mainly composed of TI's TPA3255DDV integrated Class D amplifier chip. A toggle switch controls the output mode of the Class D chip: mono coupled output transformer 100V output mode (240W*1 full power) and mono 4-ohm output mode (240W full power). Analog circuitry controls the Class D chip's output overheat and overcurrent protection to ensure it enters protection mode and resets after a fault disappears.

[0032] In this embodiment, after the preamplifier, the preamplifier signal is processed by analog circuitry for volume / priority / mixing digitization, filtering control, limiting control, and other functions before being output to the power amplifier stage and then to the output terminal.

Claims

1. A mixing device with Bluetooth FM radio function, comprising a signal input unit, a mixing processing unit, a preamplifier unit, a filtering circuit unit, a power amplifier unit, and an audio playback unit; a digital audio signal input from at least one signal input unit is mixed by the mixing processing unit, amplified by the preamplifier unit, filtered by the filtering circuit unit, amplified by the power amplifier unit, and then played back by the audio playback unit; characterized in that: The input unit includes a Bluetooth receiver module, a digital FM radio unit, and at least one microphone.

2. The mixing apparatus of claim 1, wherein: The Bluetooth receiver module and the digital FM radio unit form two background music input ports.

3. The mixing apparatus of claim 2, wherein: The Bluetooth receiver module has a built-in BLE4.2 Bluetooth audio module that supports AVRCP1.4 and A2DP1.2 protocols.

4. The mixing device with Bluetooth FM radio function according to claim 2, characterized in that: The digital FM radio unit is equipped with an FM antenna to receive and demodulate FM broadcast signals.

5. The mixing apparatus of claim 1, wherein: The mixing processing unit performs mixing processing on audio signals from different input sources, providing flexible audio source switching and mixing. The input sources include digital audio signals input from the input unit.

6. The mixing apparatus of claim 1, wherein: The preamplifier unit uses an operational amplifier to perform preliminary voltage amplification on the audio signal and improve the signal strength. The operational amplifier includes an operational amplifier with model number NE5532.

7. The mixing apparatus of claim 1, wherein: The filtering circuit unit includes a filtering unit and a limiting unit.

8. The mixing apparatus of claim 1, wherein: The power amplifier unit uses a high-power audio amplifier chip to further amplify the signal amplified by the preamplifier to the power level required to drive the audio playback unit.

9. The mixing apparatus of claim 8, wherein: The high-power audio amplifier chip includes either the LM3886 or the TPA3255DDV.

10. The mixing device with Bluetooth FM radio function according to claim 8, characterized in that: The audio playback unit includes a speaker.

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