Outdoor sound equipment audio signal output processing circuit

Abstract

The invention relates to an outdoor sound equipment audio signal output processing circuit, which comprises an ADC converter, a DSP processor, a D / A converter and a D-type power amplifier which are connected in sequence, the D / A converter is a stereo D / A converter, the ADC converter accesses an analog input signal, and the D-type power amplifier performs audio output; the analog-to-digital converter is GC5358, the DSP processor is HC6288, the D / A converter is a GC4344 digital-to-analog converter, and the D-type power amplifier is TPA3255DDVR. The multifunctional sound box formed by the circuit is strong in driving force, large in output power, bright and clear in sound, strong in penetrating power and suitable for outdoor professional performance, and solves the problems that most outdoor sound boxes are small in output power and insufficient in cruising ability.

Description

Technical Field

[0001] This patent application belongs to the technical field of outdoor speakers. More specifically, it relates to an outdoor speaker audio signal output processing circuit. Background Art

[0002] Outdoor speakers are the first choice for outdoor performances. For the convenience during performances, they are generally designed in the form of an integrated chassis with a portable structure. However, most outdoor speakers have a small output power and insufficient battery life. To meet the needs of outdoor performances, they need to develop towards multi-functional aspects such as high power and long-lasting battery life, making the speakers have the advantages of high power, firmness, durability, stability, and reliability. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an outdoor speaker audio signal output processing circuit that can meet the requirements of high power and long-lasting battery life.

[0004] To solve the above problems, the technical solution adopted by the present invention is:

[0005] An outdoor speaker audio signal output processing circuit includes an ADC converter, a DSP processor, a D / A converter, and a class-D power amplifier connected in sequence. The D / A converter is a stereo D / A converter. The ADC converter accesses an analog input signal, and the class-D power amplifier performs audio output;

[0006] The ADC converter is GC5358, the DSP processor is HC6288, the D / A converter is a GC4344 digital-to-analog converter, and the class-D power amplifier is TPA3255DDVR;

[0007] GC5358 includes IC1, IC2, and IC3,

[0008] The AINR pin of IC1 accesses the AMP_IN signal through resistor R14 and capacitor C16. The AINL pin of IC1 accesses the MIC1_2_IN signal through resistor R16 and capacitor C18. The VD pin of IC1 is connected to capacitor C28 and capacitor C29. The other ends of capacitor C28 and capacitor C29 are both connected to the DGND pin of IC1; The VA pin of IC1 is connected to capacitor C26 and capacitor C27. The other ends of capacitor C26 and capacitor C27 are both connected to the AGND pin of IC1;

[0009] The AINR pin of IC2 is connected to the INST3_IN signal through resistor R28 and capacitor C31. The AINL pin of IC3 is connected to the INST4_IN signal through resistor R29 and capacitor C32. The VD pin of IC2 is connected to capacitors C38 and C39. The other ends of capacitor C38 and capacitor C39 are both connected to the DGND pin of IC2. The VA pin of IC2 is connected to capacitors C36 and C37. The other ends of capacitor C36 and capacitor C37 are both connected to the AGND pin of IC2.

[0010] The AINR pin of IC3 is connected to the LIVE_IN signal through resistor R43 and capacitor C47. The AINL pin of IC3 is connected to the MUSIC_IN signal through resistor R44 and capacitor C48. The VD pin of IC3 is connected to capacitors C52 and C53. The other ends of capacitor C52 and capacitor C53 are both connected to the DGND pin of IC3. The VA pin of IC3 is connected to capacitors C50 and C51. The other ends of capacitor C50 and capacitor C51 are both connected to the AGND pin of IC3.

[0011] The AMP_IN signal, MIC1_2_IN signal, INST3_IN signal, INST4_IN signal, LIVE_IN signal, and MUSIC_IN signal are all analog input signals. These six signals respectively represent analog audio signals, guitars, microphones, etc.

[0012] Furthermore, the DSP processor is HC6288.

[0013] Furthermore, the D / A converter GC4344 digital-to-analog converter includes chips IC4 and IC5. The AOUTR pin of chip IC4 outputs the LIVE_OUT signal successively through capacitor C15 and resistor R13. The AOUTL pin of chip IC4 outputs the SIG_OUT signal successively through capacitor C17 and resistor R15. The FILT+ pin of chip IC4 is connected to AGND through capacitor C30.

[0014] The AOUTR pin of chip IC5 outputs the AMP_HI signal successively through capacitor C33 and resistor R31. The AOUTL pin of chip IC5 outputs the AMP_LOW signal successively through capacitor C35 and resistor R34. The FILT+ pin of chip IC5 is connected to AGND through capacitor C46.

[0015] Further, the INPUT-A pin of the class-D power amplifier TPA3255DDVR is connected to the AMP_HI+ signal through the capacitor C12, the INPUT-B pin is connected to the AMP_HI- signal through the capacitor C13, the INPUT-C pin is connected to the AMP_LOW+ signal through the capacitor C39, and the INPUT-D pin is connected to the AMP_LOW- signal through the capacitor C42; the INPUT-A pin, INPUT-B pin, INPUT-C pin, and INPUT-D are respectively connected to AMPGND through corresponding resistor-capacitor circuits;

[0016] The OUT-A pin and OUT-B pin of the TPA3255DDVR are respectively connected to the 2nd pin and 1st pin of the inductor L1. The 3rd pin and 4th pin of the inductor L1 respectively output the HF+ signal and HF- signal, and the HF+ signal and HF- signal are connected to the first speaker; the 3rd pin of the inductor L1 is also respectively connected to the capacitor C9, capacitor C3, and capacitor C10, and the capacitor C3 is in series with the resistor R3. The 4th pin of the inductor L1 is also respectively connected to the capacitor C22, capacitor C23, and capacitor C19, and the capacitor C23 is in series with the resistor R12. The other ends of the capacitor C9, resistor R3, capacitor C10, capacitor C22, resistor R12, and capacitor C19 are all connected to AMPGND;

[0017] The OUT-C pin and OUT-D pin of the TPA3255DDVR are respectively connected to the 2nd pin and 1st pin of the inductor L4. The 3rd pin and 4th pin of the inductor L4 respectively output the LF- signal and LF+ signal, and the LF+ signal and LF- signal are connected to the second speaker; the 3rd pin of the inductor L4 is also respectively connected to the capacitor C41, capacitor C32, and capacitor C34, and the capacitor C32 is in series with the resistor R18. The 4th pin of the inductor L4 is also respectively connected to the capacitor C55, capacitor C57, and capacitor C54, and the capacitor C57 is in series with the resistor R29. The other ends of the capacitor C41, resistor R18, capacitor C34, capacitor C55, resistor R29, and capacitor C54 are all connected to AMPGND.

[0018] Further, the powers of the first speaker and the second speaker are 120w - 140w and 160w - 180w respectively, and the first speaker is a high-frequency horn speaker.

[0019] Further, THD+N ≤ 0.1%, SNR ≥ 90dB.

[0020] Due to the adoption of the above technical solutions, the beneficial effects obtained by the present invention are:

[0021] 1) The multifunctional speaker formed by this circuit has strong driving force, large output power, bright, clear, and strong penetrating sound, and is suitable for outdoor professional performances, solving the problems of small output power and insufficient battery life of most outdoor speakers.

[0022] 2) It is powerful, not only having chorus and reverberation functions, but also providing a variety of sound effects to meet various performance needs.

[0023] 3) After the product of this project comes out, for the mid - to - high - end level of outdoor professional audio, with its powerful functions, super outdoor power and battery life, it is bound to occupy a large market share. Brief Description of the Drawings

[0024] Figure 1 It is the connection block diagram of the present invention.

[0025] Figure 2 It is the circuit diagram of the ADC converter in the present invention.

[0026] Figure 3 It is the circuit diagram of the DSP processor in the present invention.

[0027] Figure 4 It is the circuit diagram of the D / A converter in the present invention.

[0028] Figure 5 It is the circuit diagram of the class - D power amplifier in the present invention. Detailed Description of the Invention

[0029] The present invention will be further described in detail below with reference to the embodiments.

[0030] An outdoor audio signal output processing circuit, as shown in the Figure 1 block diagram, includes an ADC converter, a DSP processor, a D / A converter, and a class - D power amplifier connected in sequence. The D / A converter is a stereo D / A converter. The ADC converter accesses the analog input signal, and the class - D power amplifier performs audio output;

[0031] The ADC converter is GC5358, the DSP processor is HC6288, the D / A converter is the GC4344 digital - to - analog converter, and the class - D power amplifier is TPA3255DDVR.

[0032] As shown in Figure 2 , this circuit first converts the analog input signal into a digital signal to effectively eliminate interference signals, and uses the ADC converter GC5358 of GlobaIChip Company. GC5358 is a high - performance, high - sampling - rate, stereo audio analog - to - digital converter. Its sampling frequency range is 8KHz to 96KHz, which is very suitable for audio application systems from consumer - level to professional - level. GC5358 audio has MSB alignment and I2S data format, and is compatible with DTV, DVR, and AV audio systems. The specific circuit connection relationship:

[0033] GC5358 includes IC1, IC2, and IC3,

[0034] The AINR pin of IC1 is connected to the AMP_IN signal through resistor R14 and capacitor C16. The AINL pin of IC1 is connected to the MIC1_2_IN signal through resistor R16 and capacitor C18. The VD pin of IC1 is connected to capacitors C28 and C29, and the other ends of capacitors C28 and C29 are both connected to the DGND pin of IC1. The VA pin of IC1 is connected to capacitors C26 and C27, and the other ends of capacitors C26 and C27 are both connected to the AGND pin of IC1.

[0035] The AINR pin of IC2 is connected to the INST3_IN signal through resistor R28 and capacitor C31. The AINL pin of IC3 is connected to the INST4_IN signal through resistor R29 and capacitor C32. The VD pin of IC2 is connected to capacitors C38 and C39, and the other ends of capacitors C38 and C39 are both connected to the DGND pin of IC2. The VA pin of IC2 is connected to capacitors C36 and C37, and the other ends of capacitors C36 and C37 are both connected to the AGND pin of IC2.

[0036] The AINR pin of IC3 is connected to the LIVE_IN signal through resistor R43 and capacitor C47. The AINL pin of IC3 is connected to the MUSIC_IN signal through resistor R44 and capacitor C48. The VD pin of IC3 is connected to capacitors C52 and C53, and the other ends of capacitors C52 and C53 are both connected to the DGND pin of IC3. The VA pin of IC3 is connected to capacitors C50 and C51, and the other ends of capacitors C50 and C51 are both connected to the AGND pin of IC3.

[0037] The AMP_IN signal, MIC1_2_IN signal, INST3_IN signal, INST4_IN signal, LIVE_IN signal, and MUSIC_IN signal are all analog input signals. These six signals respectively represent analog audio signals, guitars, microphones, etc.

[0038] Such as Figure 3 , the input digital signal is processed by the music / microphone DSP processor HC6288. HC6288 is a 32-bit 4-core high-performance computing processor produced by HicoreTech Company. Its floating-point operation can adaptively prevent howling, suppress noise, and has various special effects sounds such as vocal beautification, chorus, reverberation, vocal cancellation, and voice transformation.

[0039] Such as Figure 4 , the digital signal after DSP processing is converted into an analog signal. The GC4344 digital-to-analog converter produced by GLOBAL CHIP Company is used. GC4344 is a stereo D / A converter with an interpolation filter inside, supporting most audio data formats.

[0040] The specific circuit is as follows:

[0041] The D / A converter GC4344 digital-to-analog converter includes chips IC4 and IC5. The AOUTR pin of chip IC4 outputs the LIVE_OUT signal successively through capacitor C15 and resistor R13. The AOUTL pin of chip IC4 outputs the SIG_OUT signal successively through capacitor C17 and resistor R15. The FILT+ pin of chip IC4 is connected to AGND through capacitor C30;

[0042] The AOUTR pin of chip IC5 outputs the AMP_HI signal successively through capacitor C33 and resistor R31. The AOUTL pin of chip IC5 outputs the AMP_LOW signal successively through capacitor C35 and resistor R34. The FILT+ pin of chip IC5 is connected to AGND through capacitor C46.

[0043] Such as Figure 5 , Class D sound quality, using the high-performance Class D power amplifier TPA3255DDVR produced by Texas Instruments. It has Class D efficiency and can bring truly high-end sound quality. It can drive two 315W speakers.

[0044] The specific circuit is as follows:

[0045] The INPUT-A pin of the Class D power amplifier TPA3255DDVR is connected to the AMP_HI+ signal through capacitor C12, the INPUT-B pin is connected to the AMP_HI- signal through capacitor C13, the INPUT-C pin is connected to the AMP_LOW+ signal through capacitor C39, and the INPUT-D pin is connected to the AMP_LOW- signal through capacitor C42; The INPUT-A pin, INPUT-B pin, INPUT-C pin, and INPUT-D are respectively connected to AMPGND through corresponding resistor-capacitor circuits;

[0046] The OUT-A pin and OUT-B pin of TPA3255DDVR are respectively connected to the 2nd pin and 1st pin of inductor L1. The 3rd pin and 4th pin of inductor L1 output the HF+ signal and HF- signal respectively. The HF+ signal and HF- signal are connected to the first speaker; The 3rd pin of inductor L1 is also respectively connected to capacitor C9, capacitor C3, and capacitor C10. Capacitor C3 is in series with resistor R3. The 4th pin of inductor L1 is also respectively connected to capacitor C22, capacitor C23, and capacitor C19. Capacitor C23 is in series with resistor R12. The other ends of capacitor C9, resistor R3, capacitor C10, capacitor C22, resistor R12, and capacitor C19 are all connected to AMPGND;

[0047] The OUT-C pin and OUT-D pin of the TPA3255DDVR are respectively connected to pin 2 and pin 1 of the inductor L4. The 3rd pin and 4th pin of the inductor L4 respectively output the LF- signal and LF+ signal, and the LF+ signal and LF- signal are connected to the second speaker. The 3rd pin of the inductor L4 is also respectively connected to the capacitor C41, capacitor C32, and capacitor C34. The capacitor C32 is in series with the resistor R18. The 4th pin of the inductor L4 is also respectively connected to the capacitor C55, capacitor C57, and capacitor C54. The capacitor C57 is in series with the resistor R29. The other ends of the capacitor C41, resistor R18, capacitor C34, capacitor C55, resistor R29, and capacitor C54 are all connected to AMPGND.

[0048] The power of the first speaker and the second speaker are 120w - 140w and 160w - 180w respectively. The first speaker is a high-frequency horn speaker.

[0049] The usage process of this circuit: The analog input signal is converted into a digital signal by the ADC converter GC5388, the digital signal is processed into the required audio effect signal by the DSP processor HC6288, and then the digital signal is converted into an analog signal by the D / C converter GC4344 and output through the class-D power amplifier TPA3255DDVR.

[0050] The technical level achieved by this circuit:

[0051] The rated power can reach 160W@1% THD

[0052] Equipped with 6 high-quality speakers, these 6 high-quality speakers are high-frequency horn speakers. Ideally, the power IC can drive 315W, but the actual power used will not reach such a large value.

[0053] 1 single-channel class-D amplified 2.25-inch high-frequency horn speaker * 6: 10W sine continuous@1%THD(RMS);

[0054] 1 single-channel class-D amplified 10-inch speaker: Class D(Type), LF(Amp): Class D(Type), 100Wsine continuous@1% THD(RMS)

[0055] 30Hz - 20kHz frequency response

[0056] MIC / XLR input port – 45dBu@1KHZ

[0057] 6.35mm LINE input port – 30dBu@1KHZ

[0058] Guitar signal input: 1 / 4"TS – 30dBu@1KHZ

[0059] 3.5mm AUX IN port – 10dBu @ 1KHZ

[0060] THD+N ≤ 0.1%, SNR ≥ 90dB.

[0061] The speaker made with this circuit has a compact size design, within 451*394*300mm.

[0062] In terms of market prospects, after this product is launched on the market, for the mid - to - high - end level of outdoor professional audio, with its powerful functions, super - strong outdoor power and battery life, it will surely occupy a large market share.

Claims

1. An outdoor audio signal output processing circuit, characterized in that: It includes an ADC converter, a DSP processor, a D / A converter, and a class D power amplifier connected in sequence, the D / A converter is a stereo D / A converter, the ADC converter receives an analog input signal, and the class D power amplifier performs audio output; The ADC converter is GC5358, the DSP processor is HC6288, the D / A converter is GC4344, and the class D power amplifier is TPA3255DDVR; GC5358 includes IC1, IC2, IC3, IC1's AINR pin is connected to AMP_IN signal through resistor R14 and capacitor C16, IC1's AINL pin is connected to MIC1_2_IN signal through resistor R16 and capacitor C18, IC1's VD pin is connected to capacitors C28 and C29, the other end of capacitor C28 and the other end of capacitor C29 are connected to IC1's DGND pin; IC1's VA pin is connected to capacitors C26 and C27, the other end of capacitor C26 and the other end of capacitor C27 are connected to IC1's AGND pin; IC2's AINR pin is connected to the INST3_IN signal through resistor R28 and capacitor C31. IC3's AINL pin is connected to the INST4_IN signal through resistor R29 and capacitor C32. IC2's VD pin is connected to capacitors C38 and C39. The other end of capacitor C38 and the other end of capacitor C39 are connected to IC2's DGND pin. IC2's VA pin is connected to capacitors C36 and C37. The other end of capacitor C36 and the other end of capacitor C37 are connected to IC2's AGND pin. IC3's AINR pin is connected to LIVE_IN signal through resistor R43 and capacitor C47, IC3's AINL pin is connected to MUSIC_IN signal through resistor R44 and capacitor C48, IC3's VD pin is connected to capacitor C52 and capacitor C53, the other end of capacitor C52 and the other end of capacitor C53 are connected to IC3's DGND pin; IC3's VA pin is connected to capacitor C50 and capacitor C51, the other end of capacitor C50 and the other end of capacitor C51 are connected to IC3's AGND pin; The AMP_IN signal, MIC1_2_IN signal, INST3_IN signal, INST4_IN signal, LIVE_IN signal, and MUSIC_IN signal are all analog input signals.

2. The outdoor audio signal output processing circuit according to claim 1, characterized in that: The DSP processor is HC6288.

3. The outdoor audio signal output processing circuit according to claim 2, characterized in that: The GC4344 digital-to-analog converter includes chips IC4 and IC5. The AOUTR pin of chip IC4 outputs the LIVE_OUT signal through capacitor C15 and resistor R13 in turn. The AOUTL pin of chip IC4 outputs the SIG_OUT signal through capacitor C17 and resistor R15 in turn. The FILT+ pin of chip IC4 is connected to AGND through capacitor C30. The AOUTR pin of the chip IC5 outputs the AMP_HI signal through the capacitor C33 and the resistor R31 in sequence, the AOUTL pin of the chip IC5 outputs the AMP_LOW signal through the capacitor C35 and the resistor R34 in sequence, and the FILT+ pin of the chip IC5 is connected to AGND through the capacitor C46.

4. The outdoor audio signal output processing circuit according to claim 3, characterized in that: The INPUT-A pin of TPA3255DDVR is connected to the AMP_HI+ signal through capacitor C12, the INPUT-B pin is connected to the AMP_HI- signal through capacitor C13, the INPUT-C pin is connected to the AMP_LOW+ signal through capacitor C39, and the INPUT-D pin is connected to the AMP_LOW- signal through capacitor C42; the INPUT-A pin, INPUT-B pin, INPUT-C pin, and INPUT-D pin are connected to AMPGND through corresponding resistor-capacitor circuits respectively; The OUT-A pin and OUT-B pin of TPA3255DDVR are connected to the 2nd pin and the 1st pin of inductor L1 respectively. The 3rd pin and the 4th pin of inductor L1 output HF+ signal and HF- signal respectively. The HF+ signal and the HF- signal are connected to the first speaker. The 3rd pin of inductor L1 is also connected to capacitor C9, capacitor C3 and capacitor C10 respectively. Capacitor C3 is connected in series with resistor R3. The 4th pin of inductor L1 is also connected to capacitor C22, capacitor C23 and capacitor C19 respectively. Capacitor C23 is connected in series with resistor R12. The other ends of capacitor C9, resistor R3, capacitor C10, capacitor C22, resistor R12 and capacitor C19 are all connected to AMPGND. The OUT-C pin and OUT-D pin of TPA3255DDVR are connected to pin 2 and pin 1 of inductor L4 respectively. Pin 3 and pin 4 of inductor L4 output LF- signal and LF+ signal respectively. LF+ signal and LF- signal are connected to the second speaker; pin 3 of inductor L4 is also connected to capacitor C41, capacitor C32, and capacitor C34 respectively. Capacitor C32 is connected in series with resistor R18. Pin 4 of inductor L4 is also connected to capacitor C55, capacitor C57, and capacitor C54 respectively. Capacitor C57 is connected in series with resistor R29. The other ends of capacitor C41, resistor R18, capacitor C34, capacitor C55, resistor R29, and capacitor C54 are all connected to AMPGND.

5. The outdoor audio signal output processing circuit according to claim 4, characterized in that: The power of the first speaker and the second speaker are 120w~140w and 160w~180w respectively, and the first speaker is a tweeter horn speaker.

6. An outdoor audio signal output processing circuit according to any one of claims 1 to 5, characterized in that: THD+N≦0.1%, SNR≧90dB.

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