CN202841493U - Electronic frequency-halving audio signal processing circuit - Google Patents
Electronic frequency-halving audio signal processing circuit Download PDFInfo
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- CN202841493U CN202841493U CN 201220504309 CN201220504309U CN202841493U CN 202841493 U CN202841493 U CN 202841493U CN 201220504309 CN201220504309 CN 201220504309 CN 201220504309 U CN201220504309 U CN 201220504309U CN 202841493 U CN202841493 U CN 202841493U
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Abstract
The utility model relates to an electronic frequency-halving audio signal processing circuit. The audio signal processing method is an electronic frequency-halving method, and comprises that after inputted left and right stereo audio signals are inputted, middle and high frequency audio signals in the left and right signals are filtered by using an electronic low-pass filter, and low frequency signals are passed through a low frequency power amplifier to a bass sound box to generate low frequency sound waves; the inputted left and right signals respectively go into respective electronic high-pass filters consisting of RCs, low frequency signals of the inputted left and right signals are filtered, and obtained middle and high frequency signals respectively go into corresponding power amplifiers; and finally sound waves are generated from a left and right surrounding (satellite) sound box. According to the utility model, the LC frequency dividing is not used, the electronic frequency dividing is used, the effective frequency band widths of various power amplifiers and various speakers are decreased, the intermodulation distortion is reduced, the low-frequency overload is reduced, the dynamic range is improved, the transient response is improved, no audio power is lost, and the loudspeaker sensitivity is convenient to control.
Description
Technical field
The utility model relates to the Audio Signal Processing of sound equipment, specifically a kind of electronics two divided-frequency audio signal processing circuit.
Background technology
As everyone knows, want to realize the high-quality broadcast of sound equipment, the amplification of audio signal and processing are very important rings.Since oneth century, people develop into transistor Audio Signal Processing and amplification from electron tube Audio Signal Processing and amplification, develop into again integrated circuit Audio Signal Processing and amplification.Technology is in continuous progress, and the level of Audio Signal Processing is also more and more higher.
In " loud speaker and the audio amplifier design manual " published in July, 2008, Passive LC inductance capacitance frequency splitting technology (99-123) and Active crossover network technology (212-214) are disclosed in Fujian science tech publishing house.What National Defense Industry Press published in 2006 " in the practical loudspeaker techniques handbook, Passive LC frequency splitting technology (273-277) is disclosed also.These disclosed Passive LC inductance capacitance frequency splitting technologies owing to be to be positioned at after the audio power output, just inevitably bring the audio power loss.And intermodulation distortion is large in addition, the low frequency overload is high, dynamic range is little, transient response is poor and the difficult drawback of each loudspeaker sensitivity control, makes total playing quality variation.And cost is also high, need to expend the raw material such as copper material, not environmental protection.
The utility model content
The purpose of this utility model be to provide a kind of intermodulation distortion little, amplify that frequency band is narrow, the low frequency overload is little, dynamic range is high, transient response reaches well the very manageable electronics two divided-frequency of each speaker volume audio signal processing circuit, can be advantageously applied in multi-media sound system, apple audio amplifier, home theater, home music center and the automobile audio.
The technical scheme that the utility model adopts for achieving the above object is: electronics two divided-frequency audio signal processing circuit, comprise power amplifier, bass box, left front audio amplifier and the right front audio amplifier of putting put, comprise three separate branch roads, terminal is respectively bass box, left front audio amplifier and the right front audio amplifier of putting put; Wherein left frontly put audio amplifier and be connected the input of putting audio amplifier and connect respectively separately power amplifier, the prime of two power amplifiers connects respectively the RC high pass filter that is comprised of high-pass filtering electric capacity and high-pass filtering resistance; The prime of bass box connects a power amplifier, and the input of power amplifier connects the low frequency volume and adjusts potentiometer, two RC high pass filters be input as the full range signal.
The input of described two RC high pass filters connects respectively two outputs of total volume adjustment unit.
Described total volume adjustment unit adopts duplex potentiometer, and input signal is from left front sound channel and the right front sound channel of putting of putting of source of sound.
Described low frequency volume is adjusted potentiometer and is converted the full range signal to low frequency signal by total volume adjustment unit, isolation resistance and low pass filter, two outputs of total volume adjustment unit connect respectively an isolation resistance, two isolation resistances connect the input of low pass filter, and the output of low pass filter connects the low frequency volume and adjusts potentiometer.
The resistance value of described isolation resistance is identical, is 10k Ω-33k Ω.
Described low pass filter is electronic filter, and corner frequency is 100Hz-180Hz.
Described high-pass filtering electric capacity and high-pass filtering resistance meet
Wherein, f is the corner frequency of RC high pass filter, and R is the resistance value of high-pass filtering resistance, and C is the capacitance of high-pass filtering electric capacity.
The corner frequency f of described RC high pass filter is 120Hz-200Hz.
Also comprise three separate branch roads, terminal is respectively center-channel speaker, left surround speaker and right surround speaker; These three audio amplifiers connect respectively power amplifier separately, and the prime of three power amplifiers connects respectively the RC high pass filter that is comprised of high-pass filtering electric capacity and high-pass filtering resistance separately, three RC high pass filters be input as the full range signal.
The parameter of the RC high pass filter of described each bar branch road is identical, and the parameter of the power amplifier of each bar branch road is identical.
The utlity model has following advantage:
1. audio signal processing circuit of the present utility model has adopted the RC high pass filter, and the LC filter ratio with traditional has reduced intermodulation distortion, without the frequency division power loss.
2. the utility model has adopted each voice-grade channel to amplify separately, and like this, each amplifier band width narrows down, and amplitude-frequency characteristic improves, and amplifies the frequency domain frequency and exports smooth.
3. the utility model adopts Active crossover, and audio-frequency power amplifier low frequency overload is reduced, and dynamic range improves.
4. the utility model adopts each voice-grade channel promotion audio amplifier separately to sound, with traditional left and right preposition sound channel, left and right surround channel, center channels five-sound channel are generally full range and amplify the promotion difference, have adopted RC electronics low frequency filtering, filtering low frequency, and low frequency is processed in addition separately by low channel, greatly reduce this No. five loud speaker audio frequency intermodulation distortion, cut apart distortion, improved transient response, reduce the power requirement of loud speaker, greatly reduced overload.
5. the utility model is owing to taking full advantage of the modern integrated circuits technology without materials such as copper cash, cost, and environmental protection.
Description of drawings
Fig. 1 is the circuit structure diagram of the utility model embodiment one;
Fig. 2 is the circuit structure diagram of the utility model embodiment two.
Wherein, 1, total volume adjustment unit; 2, high pass filter electric capacity; 3, high pass filter resistance; 4, power amplifier; 5, center-channel speaker; 6, isolation resistance; 7, low pass filter; 8, the low frequency volume is adjusted potentiometer; 9, bass box; The 10 left front audio amplifiers of putting; 11, the right front audio amplifier of putting; 12, left surround speaker; 13, right surround speaker.
Embodiment
Below in conjunction with drawings and Examples the utility model is described in further detail.
Embodiment one
As shown in Figure 1, the utility model comprises total volume adjustment unit 1, high-pass filtering electric capacity 2, high-pass filtering resistance 3, power amplifier 4, left front audio amplifier 10, right front audio amplifier 11, isolation resistance 6, low pass filter 7, low frequency volume adjustment potentiometer 8 and bass box 9 compositions put put.Here, total volume adjustment unit 1 can be used duplex potentiometer, also can use the electronic sound volume adjuster.What present embodiment was used is duplex potentiometer, and its resistance is 2X10k Ω.High-pass filtering electric capacity 2 can be with thin-film electro multi-layer ceramic capacitance perhaps, and high-pass filtering resistance 3 can adopt common fixed carbon resister, or metalfilmresistor.What present embodiment adopted is thin-film capacitor and fixed carbon resister.High-pass filtering electric capacity 2 and high-pass filtering resistance 3 form the RC electronic high pass filter.The low pass attenuation rate of this high pass filter is 6dB/OCT, and its corner frequency is 120Hz-200Hz.Present embodiment is 160Hz.The capacity of high-pass filtering electric capacity 2 and high-pass filtering resistance 3 and resistance are calculated by following formula:
Here, f is the high pass corner frequency, and R and C are respectively the resistance of high-pass filtering resistance 3 and the capacitance of high-pass filtering electric capacity 2.Present embodiment is that high-pass filtering resistance 3 is 4.7k Ω, and high-pass filtering electric capacity 2 is 0.15 μ f.Left and right preposition channel power amplifier 4 is identical, can adopt integrated power amplifier, also can use discrete component semiconductor power amplifier and electron tube power amplifier.What present embodiment was used is integrated power amplifier, and concrete model is TDA2030A.Left and right preposition audio amplifier is identical, gets final product with general loudspeaker acoustic enclosure, can use internal magnetic loudspeaker, also can use outer-magnet speaker.
It can be common potentiometer that the low frequency volume is adjusted potentiometer 8, also can be the electronic sound volume adjuster.Here usefulness is common potentiometer, and its resistance is 10k Ω.The power amplifier 4 that low frequency is used also is general audio-frequency power amplifier.Present embodiment is the integrated circuit audio-frequency power amplifier, and concrete model is TDA2030A.Also can with 2 integrated power amplifiers, be connected into the BTL circuit.The low frequency power output that can double like this is to satisfy the larger requirement of low frequency power output.
All electronics two divided-frequency audio signal processing circuit can design on a printed circuit board, can use lamina, also can use doubling plate.Present embodiment single layer printed circuit plate.
Embodiment two
As shown in Figure 2, the difference of present embodiment and embodiment one is: embodiment one form 2.1 stereo component systems, and present embodiment is 5.1 home theater sound equipment systems for stereo left and right two voice-grade channels input.It is input as 6 tunnel audio signals, i.e. left and right preposition sound channel, left and right surround channel, center channels, subwoofer channel (claiming again subwoofer channel).The signal of the first five sound channel is all inputted the RC electronic high pass filter that is comprised of high-pass filtering resistance 3 and high-pass filtering electric capacity 2 accordingly separately.Its corner frequency is selected all identical with embodiment one with attenuation rate with resistance capacitance.This five tunnel audio signal separately power amplifier 4 and audio amplifier separately, all identical with embodiment one.The bass volume of bass channel is adjusted and sound rate power amplifier 4 and bass box, and is all identical with embodiment one.Just cancelled the isolation resistance 6 of embodiment one.
Operation principle of the present utility model is:
After prime audio frequency full range signal is input to electronics two divided-frequency audio signal processing circuit of the present utility model, through total volume adjustment unit 1, at first enter the RC high pass filter that is formed by high-pass filtering resistance 3 and high-pass filtering electric capacity 2, will be lower than the following low frequency signal filtering of corner frequency.Like this, filtered audio signal just is not the full range signal of original 20Hz-20kHz, and becomes 160Hz-20kHz.Thereby frequency band narrowed down, and this signal after power amplifier 4 amplifies, is exported to loud speaker again, and loud speaker carries out the electroacoustic conversion and sounds.Because audio bandwidth narrows down, and the amplitude-frequency characteristic of amplifier is improved, and in the audible spectrum, low frequency end is that energy is the highest, it is the strongest namely to drive the loud speaker amplitude.Because the main energy work rate of this section of 20Hz-160Hz is removed, and is processed by subwoofer channel specially, woofer (subwoofer) is responsible for, and left and right preposition diaphragm of loudspeaker amplitude is reduced greatly.Consequently intermodulation distortion diminishes, the low frequency overload greatly reduces, transient response improves, the diaphagras distortion reduction, thereby the sound tonequality of playback is increased substantially.
And input full range signal is mixed into one tunnel mixed signal by isolation resistance 6 behind total volume adjustment unit, and via low pass filter filtering, with the high-frequency signal filtering, its corner frequency is 140Hz, and the high frequency attenuation rate is 12dB/OCT.What obtain through low pass filter 7 like this is the low frequency signal of 20Hz-140Hz.This narrow band signal is adjusted potentiometer 8 through the bass volume, is transferred to power amplifier, and the audio power after the amplification is by bass box 9(subwoofer) finish the electroacoustic conversion, send the bass sound wave.After above processing, the low frequency signal bandwidth is very narrow, only is from 20Hz-140Hz, thereby intermodulation distortion diminishes, and intermodulation distortion reduces, and cuts apart the vibrations distortion reduction, and bass tonequality is improved.
Electronics two divided-frequency audio signal processing circuit of the present utility model, because ingenious employing RC electronics two divided-frequency, with No. three amplifiers carry out Audio power amplifier, each road amplifier band width all is reduced, make amplitude-frequency characteristic become excellent, intermodulation distortion diminishes, and woofer and each effective audio frequency range preposition, mid-, that circulating loudspeaker is born are narrowed down.Woofer is preposition, mid-with each like this, Each performs its own functions for circulating loudspeaker, act in accordance with the division of their functions and duties, all given play to separately the audio frequency frequency domain advantage of oneself, made that each is preposition, mid-, surround channel playback tonequality is more clear, thorough, accurate, made simpler and more honest, the shock of subwoofer channel.Simultaneously, owing to unlike the LC frequency divider, will with precious metals such as a large amount of copper materials, make product cost reduce more environmental protection.
Claims (10)
1. electronics two divided-frequency audio signal processing circuit, comprise power amplifier (4), bass box (9), left front audio amplifier (10) and the right front audio amplifier (11) of putting put, it is characterized in that, comprise three separate branch roads, terminal is respectively bass box (9), left front audio amplifier (10) and the right front audio amplifier (11) of putting put; Wherein left frontly put audio amplifier (10) and be connected the input of putting audio amplifier (11) and connect respectively separately power amplifier (4), the prime of two power amplifiers (4) connects respectively the RC high pass filter that is comprised of high-pass filtering electric capacity (2) and high-pass filtering resistance (3); The prime of bass box (9) connects a power amplifier (4), and the input of power amplifier (4) connects the low frequency volume and adjusts potentiometer (8), two RC high pass filters be input as the full range signal.
2. electronics two divided-frequency audio signal processing circuit according to claim 1 is characterized in that, the input of described two RC high pass filters connects respectively two outputs of total volume adjustment unit (1).
3. electronics two divided-frequency audio signal processing circuit according to claim 2 is characterized in that, described total volume adjustment unit (1) adopts duplex potentiometer, and input signal is from left front sound channel and the right front sound channel of putting of putting of source of sound.
4. electronics two divided-frequency audio signal processing circuit according to claim 1 and 2, it is characterized in that, described low frequency volume is adjusted potentiometer (8) and is converted the full range signal to low frequency signal by total volume adjustment unit (1), isolation resistance (6) and low pass filter (7), two outputs of total volume adjustment unit (1) connect respectively an isolation resistance (6), two isolation resistances (6) connect the input of low pass filter (7), and the output of low pass filter (7) connects the low frequency volume and adjusts potentiometer (8).
5. electronics two divided-frequency audio signal processing circuit according to claim 4 is characterized in that, the resistance value of described isolation resistance (6) is identical, is 10k Ω-33k Ω.
6. electronics two divided-frequency audio signal processing circuit according to claim 4 is characterized in that, described low pass filter (7) is electronic filter, and corner frequency is 100Hz-180Hz.
7. electronics two divided-frequency audio signal processing circuit according to claim 1 is characterized in that, described high-pass filtering electric capacity (2) and high-pass filtering resistance (3) meet
Wherein, f is the corner frequency of RC high pass filter, and R is the resistance value of high-pass filtering resistance (3), and C is the capacitance of high-pass filtering electric capacity (2).
8. electronics two divided-frequency audio signal processing circuit according to claim 7 is characterized in that, the corner frequency f of described RC high pass filter is 120Hz-200Hz.
9. electronics two divided-frequency audio signal processing circuit according to claim 1 is characterized in that, also comprises three separate branch roads, and terminal is respectively center-channel speaker (5), left surround speaker (12) and right surround speaker (13); These three audio amplifiers connect respectively power amplifier (4) separately, the prime of three power amplifiers (4) connects respectively the RC high pass filter that is comprised of high-pass filtering electric capacity (2) and high-pass filtering resistance (3) separately, three RC high pass filters be input as the full range signal.
10. according to claim 1 or 9 described electronics two divided-frequency audio signal processing circuits, it is characterized in that the parameter of the RC high pass filter of described each bar branch road is identical, the parameter of the power amplifier of each bar branch road (4) is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220504309 CN202841493U (en) | 2012-09-27 | 2012-09-27 | Electronic frequency-halving audio signal processing circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220504309 CN202841493U (en) | 2012-09-27 | 2012-09-27 | Electronic frequency-halving audio signal processing circuit |
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| CN202841493U true CN202841493U (en) | 2013-03-27 |
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| CN 201220504309 Expired - Lifetime CN202841493U (en) | 2012-09-27 | 2012-09-27 | Electronic frequency-halving audio signal processing circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105163232A (en) * | 2015-06-23 | 2015-12-16 | 上海银江电子有限公司 | Multi-channel active electronic frequency division sound circuit and method |
| CN105323678A (en) * | 2014-06-06 | 2016-02-10 | 恩智浦有限公司 | Signal processing circuit |
| CN105812988A (en) * | 2014-12-30 | 2016-07-27 | 深圳纽斯声学系统有限公司 | Dual-box subwoofer and television set internally provided with same |
| CN106921352A (en) * | 2015-12-24 | 2017-07-04 | 株式会社村田制作所 | Power amplifier module |
| CN112511966A (en) * | 2020-11-06 | 2021-03-16 | 华南理工大学 | Self-adaptive active frequency division method for vehicle-mounted stereo playback |
| TWI784178B (en) * | 2019-06-27 | 2022-11-21 | 名世電子企業股份有限公司 | Vacuum tube and transistor amplifier natural sound field crossover system |
-
2012
- 2012-09-27 CN CN 201220504309 patent/CN202841493U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105323678A (en) * | 2014-06-06 | 2016-02-10 | 恩智浦有限公司 | Signal processing circuit |
| CN105323678B (en) * | 2014-06-06 | 2018-10-02 | 恩智浦有限公司 | Signal processing circuit |
| CN105812988A (en) * | 2014-12-30 | 2016-07-27 | 深圳纽斯声学系统有限公司 | Dual-box subwoofer and television set internally provided with same |
| CN105163232A (en) * | 2015-06-23 | 2015-12-16 | 上海银江电子有限公司 | Multi-channel active electronic frequency division sound circuit and method |
| CN105163232B (en) * | 2015-06-23 | 2017-12-22 | 上海银江电子有限公司 | A kind of multi-channel active Active crossover acoustics circuit and method |
| CN106921352A (en) * | 2015-12-24 | 2017-07-04 | 株式会社村田制作所 | Power amplifier module |
| TWI784178B (en) * | 2019-06-27 | 2022-11-21 | 名世電子企業股份有限公司 | Vacuum tube and transistor amplifier natural sound field crossover system |
| CN112511966A (en) * | 2020-11-06 | 2021-03-16 | 华南理工大学 | Self-adaptive active frequency division method for vehicle-mounted stereo playback |
| CN112511966B (en) * | 2020-11-06 | 2021-12-17 | 华南理工大学 | Self-adaptive active frequency division method for vehicle-mounted stereo playback |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHENZHEN NIUSI ACOUSTIC SYSTEM CO., LTD. Free format text: FORMER OWNER: ZHENG QUANLU Effective date: 20141021 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 110179 SHENYANG, LIAONING PROVINCE TO: 518132 SHENZHEN, GUANGDONG PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20141021 Address after: 518132 Guangdong province Shenzhen Guangming New District Gongming street community Tianliao Juhui mould Industrial Park 4 Building 5 floor A District Patentee after: SHEN ZHEN NEUSOUND Co.,Ltd. Address before: Hunnan rookie street Shenyang city Liaoning province 110179 Neusoft Software Park Building 2 A4 Patentee before: Zheng Quanlu |
|
| CX01 | Expiry of patent term |
Granted publication date: 20130327 |
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| CX01 | Expiry of patent term |