Outdoor sound equipment audio signal output processing circuit

Abstract

The utility model relates to an outdoor sound equipment audio signal output processing circuit, comprising 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] The patent application belongs to the technical field of outdoor sound, more specifically, it relates to an outdoor sound audio signal output processing circuit. BACKGROUND

[0002] Outdoor sound is the first choice for outdoor performance, in order to facilitate performance, generally designed into a form of a machine box, with a hand-held structure. But most of the outdoor sound output power is small, and the endurance is insufficient. In order to meet the needs of outdoor performance, it is necessary to develop high-power, long-lasting endurance and other functions, so that the sound box has the advantages of large power, firmness, durability, stability, reliability and the like. CONTENT OF THE UTILITY MODEL

[0003] The technical problem to be solved by the utility model is to provide an outdoor sound audio signal output processing circuit, which can meet the needs of high power and long-lasting endurance.

[0004] In order to solve the above problems, the technical scheme adopted by the utility model is:

[0005] An outdoor sound audio signal output processing circuit, comprising ADC converter, DSP processor, D / A converter and D-class power amplifier connected in sequence, the D / A converter is a stereo D / A converter, the ADC converter inputs analog input signal, and the D-class power amplifier outputs audio;

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

[0007] The GC5358 comprises IC1, IC2 and IC3,

[0008] The AINR pin of IC1 is connected with AMP_IN signal through resistor R14 and capacitor C16, the AINL pin of IC1 is connected with MIC1_2_IN signal through resistor R16 and capacitor C18, the VD pin of IC1 is connected with capacitor C28 and capacitor C29, and the other end of capacitor C28 and the other end of capacitor C29 are connected with the DGND pin of IC1; the VA pin of IC1 is connected with capacitor C26 and capacitor C27, and the other end of capacitor C26 and the other end of capacitor C27 are connected with 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 capacitor C38 and capacitor C39, and the other end of capacitor C38 and the other end of capacitor C39 are both connected to the DGND pin of IC2; the VA pin of IC2 is connected to capacitor C36 and capacitor C37, and the other end of capacitor C36 and the other end of 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 capacitor C52 and capacitor C53, and the other end of capacitor C52 and the other end of capacitor C53 are both connected to the DGND pin of IC3; the VA pin of IC3 is connected to capacitor C50 and capacitor C51, and the other end of capacitor C50 and the other end of capacitor C51 are both connected to the AGND pin of IC3;

[0011] The AMP IN signal, the MIC1 2 IN signal, the INST3 IN signal, the INST4 IN signal, the LIVE IN signal and the MUSIC IN signal are all analog input signals. The above six signals respectively represent analog audio signals, guitars, microphones and the like.

[0012] Further, the DSP processor is HC6288.

[0013] Further, 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 through capacitor C15 and resistor R13 in sequence, the AOUTL pin of chip IC4 outputs the SIG OUT signal through capacitor C17 and resistor R15 in sequence, and 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 through capacitor C33 and resistor R31 in sequence, the AOUTL pin of chip IC5 outputs the AMP LOW signal through capacitor C35 and resistor R34 in sequence, and 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, the INPUT-B pin, the INPUT-C pin and the INPUT-D pin are respectively connected to the AMPGND through the corresponding resistance-capacitance circuit.

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

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

[0018] Further, the power of the first horn and the second horn is respectively 120w-140w and 160w-180w, and the first horn is a high-pitched horn.

[0019] Further, THD+N≦0.1%, and SNR≧90dB.

[0020] Thanks to the above technical solutions, the utility model has the following beneficial effects:

[0021] 1) The multi-functional sound box formed by the circuit has strong driving force, large output power, bright and clear sound and strong penetration, is suitable for outdoor professional performance, and solves the problems of small outdoor sound output power and insufficient endurance.

[0022] 2) powerful, not only have chorus, reverberation function, but also provide a variety of sound effects to meet the needs of various performances.

[0023] 3) this project product after the advent of the outdoor professional audio high-end level, with its powerful function, super outdoor power and endurance, will be able to occupy a larger market share. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 for the connection block diagram of the utility model.

[0025] Figure 2 for the circuit diagram of ADC converter in the utility model.

[0026] Figure 3 for the circuit diagram of DSP processor in the utility model.

[0027] Figure 4 for the circuit diagram of D / A converter in the utility model.

[0028] Figure 5 for the circuit diagram of class D power amplifier in the utility model. DETAILED DESCRIPTION

[0029] The utility model will be further described in detail in combination with examples.

[0030] An outdoor sound audio signal output processing circuit, such as Figure 1 The block diagram, comprising ADC converter, DSP processor, D / A converter, class D power amplifier connected in turn, D / A converter is stereo D / A converter, ADC converter accesses analog input signal, class D power amplifier carries out audio output;

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

[0032] As Figure 2 , the circuit converts analog input signal into digital signal first, effectively eliminates interference signal, adopts ADC converter GC5358 of GlobalChip company. GC5358 is a high-performance, a sampling rate, stereo audio analog-digital converter. Its sampling frequency range is 8KHz~96KHz, is very suitable for from consumer level to professional level audio application system. GC5358 audio has MSB alignment and I2S data format, and is compatible with DTV, DVR, AV audio system. The specific circuit connection relation is as follows:

[0033] GC5358 includes IC1, IC2, 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 capacitor C28 and capacitor C29, the other end of capacitor C28 and the other end of 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 end of capacitor C26 and the other end of capacitor 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 capacitor C38 and capacitor C39, the other end of capacitor C38 and the other end of capacitor C39 are both connected to the DGND pin of IC2; the VA pin of IC2 is connected to capacitor C36 and capacitor C37, the other end of capacitor C36 and the other end of capacitor 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 capacitor C52 and capacitor C53, the other end of capacitor C52 and the other end of capacitor C53 are both connected to the DGND pin of IC3; the VA pin of IC3 is connected to capacitor C50 and capacitor C51, the other end of capacitor C50 and the other end of capacitor C51 are both connected to the AGND pin of IC3;

[0037] The AMP IN signal, the MIC1 2 IN signal, the INST3 IN signal, the INST4 IN signal, the LIVE IN signal and the MUSIC IN signal are all analog input signals. The above six signals respectively represent analog audio signals, guitars, microphones and the like.

[0038] As shown in Figure 3 , the input digital signals are processed by the music / microphone DSP processor HC6288. HC6288 is a 32-bit 4-core high-performance operation processor produced by HicoreTech Company. Its floating point operation can adaptively prevent howling, suppress noise, and has multiple special effects such as voice beautification, chorus, reverb, voice elimination, voice change and the like.

[0039] As shown in Figure 4 , the digital signals processed by the DSP are converted into analog signals. GC4344 digital-to-analog converter produced by GLOBAL CHIP Company is used. GC4344 is a stereo D / A converter, which contains an interpolation filter and supports most audio data formats.

[0040] The specific circuit is as follows:

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

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

[0043] As shown in Figure 5 , the Class D level sound quality adopts a TPA3255DDVR high-performance Class D power amplifier produced by TI, which has a Class D efficiency and can bring real 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 an AMP_HI+ signal through a capacitor C12, the INPUT-B pin is connected to an AMP_HI- signal through a capacitor C13, the INPUT-C pin is connected to an AMP_LOW+ signal through a capacitor C39, and the INPUT-D pin is connected to an AMP_LOW- signal through a capacitor C42. The INPUT-A pin, the INPUT-B pin, the INPUT-C pin and the INPUT-D pin are respectively connected to AMPGND through corresponding resistance-capacitance circuits.

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

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

[0048] The power of the first loudspeaker and the second loudspeaker is 120w-140w and 160w-180w respectively, and the first loudspeaker is a high-pitched horn loudspeaker.

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

[0050] The technical level reached by the circuit:

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

[0052] Six high-quality loudspeakers are mounted, the six high-quality loudspeakers are high-pitched horn loudspeakers, and the power IC can drive 315W in an ideal case, and the power cannot reach so large in actual use.

[0053] One 2.25-inch high-pitched horn loudspeaker amplified by a single class D: 10W sine continuous@1% THD (RMS);

[0054] One 10-inch loudspeaker amplified by a single class D: Class D (Type), LF (Amp): Class D (Type), 100W sine 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 by the circuit has a small size and is designed within 451*394*300mm.

[0062] In terms of market prospects, after being put on the market, this product can occupy a larger market share in the high-end level of outdoor professional sound with its powerful functions, super outdoor power and endurance.

Claims

1. An outdoor sound audio signal output processing circuit, characterized by: The ADC converter, the DSP processor, the D / A converter and the class-D power amplifier are sequentially connected, the D / A converter is a stereo D / A converter, the ADC converter is connected with 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 digital-analog converter, and the class-D power amplifier is TPA3255DDVR. The GC5358 comprises IC1, IC2 and IC3. The AINR pin of the IC1 is connected with the AMP_IN signal through the resistor R14 and the capacitor C16, the AINL pin of the IC1 is connected with the MIC1_2_IN signal through the resistor R16 and the capacitor C18, the VD pin of the IC1 is connected with the capacitor C28 and the capacitor C29, the other end of the capacitor C28 and the other end of the capacitor C29 are connected with the DGND pin of the IC1, the VA pin of the IC1 is connected with the capacitor C26 and the capacitor C27, and the other end of the capacitor C26 and the other end of the capacitor C27 are connected with the AGND pin of the IC1; The AINR pin of the IC2 is connected with the INST3_IN signal through the resistor R28 and the capacitor C31, the AINL pin of the IC3 is connected with the INST4_IN signal through the resistor R29 and the capacitor C32, the VD pin of the IC2 is connected with the capacitor C38 and the capacitor C39, the other end of the capacitor C38 and the other end of the capacitor C39 are connected with the DGND pin of the IC2, the VA pin of the IC2 is connected with the capacitor C36 and the capacitor C37, and the other end of the capacitor C36 and the other end of the capacitor C37 are connected with the AGND pin of the IC2; The AINR pin of the IC3 is connected with the LIVE_IN signal through the resistor R43 and the capacitor C47, the AINL pin of the IC3 is connected with the MUSIC_IN signal through the resistor R44 and the capacitor C48, the VD pin of the IC3 is connected with the capacitor C52 and the capacitor C53, the other end of the capacitor C52 and the other end of the capacitor C53 are connected with the DGND pin of the IC3, the VA pin of the IC3 is connected with the capacitor C50 and the capacitor C51, and the other end of the capacitor C50 and the other end of the capacitor C51 are connected with the AGND pin of the IC3. The AMP_IN signal, the MIC1_2_IN signal, the INST3_IN signal, the INST4_IN signal, the LIVE_IN signal and the MUSIC_IN signal are analog input signals.

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

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

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

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

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