CN2938669Y - Bass processing circuit - Google Patents
Bass processing circuit Download PDFInfo
- Publication number
- CN2938669Y CN2938669Y CN 200620120845 CN200620120845U CN2938669Y CN 2938669 Y CN2938669 Y CN 2938669Y CN 200620120845 CN200620120845 CN 200620120845 CN 200620120845 U CN200620120845 U CN 200620120845U CN 2938669 Y CN2938669 Y CN 2938669Y
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- CN
- China
- Prior art keywords
- adder
- pass filter
- input
- channel
- band pass
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Stereophonic System (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Abstract
The utility model discloses a bass processing circuit, comprising a first summer, a low pass filter, a three-stage parallel band pass filter group, a second summer, an inverting amplifier, a third summer group and a power amplifier connected in series. The three-stage parallel band pass filter group reshapes the low/medium-frequency audio signals filtered by the low pass filter and splits into three audio output signals, which are mixed in the second summer, gained in the inverting amplifier, synthesized in the third summer group and the left/right channels, and finally sent to the power amplifier for amplification, driving the left and right channel loudspeakers to make a sound. The listener listening, an inter-modulated product with the frequency difference of the three audio signals may be generated in the ear, which can simulate that the virtual output frequency is lower than the lower frequency limit of the loudspeaker, thereby obtaining the purpose of enhancing bass effect.
Description
[technical field]
The utility model relates to the sound technique field, refers in particular to a kind of bass treatment circuit.
[background technology]
The bass effect of stereo set is main to be that size by loud speaker decides, in order to pursue better bass effect, and generally can be more large-scale, higher-quality loud speaker obtains by using.But, existing some electronic equipment is such as mobile phone, notebook computer, MP3 player and personal digital assistant etc., owing to limit by the volume of this kind equipment own, its audio system can not be used big-and-middle-sized loud speaker, and can only depend on miniature loudspeaker; In addition, in order to save cost, the audio system of this kind equipment is used not too accurate loud speaker mostly.This miniature loudspeaker does not possess the ability of good reproduction low-frequency sound, can not reproduce audio-frequency information " genuineness ".
[summary of the invention]
The purpose of this utility model is to provide a kind of and can be applicable to loud speaker (particularly miniature loudspeaker) and strengthen the bass treatment circuit of its bass effect.
The purpose of this utility model is achieved in that a kind of bass treatment circuit, it includes first adder, low pass filter, three grades of band pass filter groups in parallel, second adder, inverting amplifier, the 3rd adder group and power amplifier, and the input of described first adder is connected with L channel input, R channel input; Described low pass filter is connected with first adder; Described three grades of band pass filter groups in parallel are made of the band pass filter of three parallel connections, and its three inputs all are connected in the output of described low pass filter, and three outputs connect into the input of described second adder; The output of described second adder connects into the input of described inverting amplifier; The output of described inverting amplifier connects into the input of the L channel adder in described the 3rd adder group and the input of R channel adder respectively; The input of described L channel adder is connected with described L channel input, and the input of described R channel adder is connected with described R channel input; Described the 3rd adder group connects into described power amplifier; Described power amplifier is connected with left channel loudspeaker and right channel loudspeaker.
In the above-mentioned bass treatment circuit, connect into a volume adjuster between described second adder and the described inverting amplifier.
In the above-mentioned bass treatment circuit, have access to an effect process switch between described inverting amplifier and described the 3rd adder group.
In the above-mentioned bass treatment circuit, the centre frequency of three band pass filters of described three grades of band pass filters in parallel is set to be mutually multiple.
In the above-mentioned bass treatment circuit, the bandwidth frequency of each band pass filter in described three grades of band pass filters in parallel is set to equal less than 10Hz.
The beneficial effects of the utility model are: three grades of band pass filter groups in parallel in this bass treatment circuit will be filtered the medium and low frequency audio signal shaping of gained and will be divided into three audio signal outputs by low pass filter, mixing the back via second adder gains by inverting amplifier, and respectively on the 3rd an adder group and a left side, right channel audio signal is synthetic, sending into power amplifier at last carries out power amplification and promotes left channel loudspeaker and right channel loudspeaker pronunciation, when the hearer listens to, the intermodulation product of the difference of meeting generation and three audio signal frequencies in people's ear, fictionalize frequency and be lower than the sound of the lower frequency limit of loud speaker, thereby reach the purpose that strengthens bass effect.
[description of drawings]
Below in conjunction with drawings and Examples the utility model is described further.
Fig. 1 is the functional-block diagram of the utility model bass treatment circuit.
Fig. 2 is the circuit theory diagrams of the utility model bass treatment circuit.
[embodiment]
Bass treatment circuit disclosed in the utility model is applied to loud speaker, miniature loudspeaker particularly, it is according to the psychoacoustic principle that is called virtual tone (Virtual Pitch), utilize the non-linear characteristics of response of the ear acoustic energy, in hearer's ear, fictionalize low-frequency sound, make the hearer produce loud speaker and send in fact the also sensation of non-existent bass, thereby reach the purpose that strengthens bass effect.
With reference to illustrated in figures 1 and 2, this bass treatment circuit includes first adder 10, low pass filter 12, three grades of band pass filter groups 14 in parallel, second adder 16, inverting amplifier 18, the 3rd adder group 20 and power amplifiers 22.The input of first adder 10 is connected with L channel input 24, R channel input 26, be used for synthetic external audio signal from the left and right sound channels input, and the audio signal of exporting a combination is to connected low pass filter 12, and this combining audio signals is the linear sum of the audio signal imported of above-mentioned left and right sound channels.Low pass filter 12 is used to filter out the audio signal above its part-frequency point, obtaining the medium and low frequency harmonic wave in the audio signal that first adder 10 transmitted, be set to 350Hz as part-frequency point that can this low pass filter 12 and obtain medium and low frequency harmonic wave below the 350Hz.Three grades of band pass filter groups 14 in parallel are made of the band pass filter of three parallel connections, its three inputs all are connected in the output of low pass filter 12, three outputs connect into the input of second adder 16, it is used for the audio signal that low pass filter 12 is produced is carried out shaping so that strengthen miniature loudspeaker the harmonic wave of irreproducible low frequency signal.Be aptly, the centre frequency of three band pass filters of these three grades of band pass filter groups 14 in parallel is set to be mutually multiple, centre frequency as first band pass filter is set to 100Hz, the centre frequency of other two band pass filters is set to 50Hz and 150Hz, and the bandwidth frequency of each band pass filter is set to equal to be advisable less than 10Hz.The output of second adder 16 connects into the input of inverting amplifier 18, the output of inverting amplifier 18 connects into the input of the L channel adder 200 in the 3rd adder group 20 and the input of R channel adder 210 respectively, the input of L channel adder 200 is connected with L channel input 24, and the input of R channel adder 210 is connected with R channel input 26.A plurality of audio signals that three grades of band pass filter group 14 shapings in parallel are produced are delivered to inverting amplifier 18 after mixing via second adder 16, send into L channel adder 200 and R channel adder 210 respectively after 18 pairs of these signal gains of inverting amplifier are amplified, and synthesize with left channel audio signal, right channel audio signal respectively.The 3rd adder group 20 connects into power amplifier 22, the audio signal that L channel adder 200 and R channel adder 210 are produced is sent into power amplifier 22, and to carry out power anti-big, thereby promote the left channel loudspeaker 28 and right channel loudspeaker 30 pronunciations that are attached thereto.Owing to have nonlinear feature during response of the ear acoustic energy, this sense of hearing mechanism non-linear produced additional overtone and and the intermodulation distortion of sound form, promptly in people's ear, will produce and the corresponding intermodulation product of difference of a plurality of actual frequency sums and a plurality of actual frequency.Three grades of band pass filter groups 14 in parallel will be filtered the medium and low frequency audio signal shaping of gained and will be divided into three audio signal outputs by low pass filter 12, mix the back by inverting amplifier 18 gains via second adder 16, and respectively on the 3rd an adder group 20 and a left side, right channel audio signal is synthetic, sending into power amplifier 22 at last carries out power amplification and promotes left channel loudspeaker 28 and right channel loudspeaker 30 pronunciations, when the hearer listens to, the intermodulation product of the difference of meeting generation and three audio signal frequencies in people's ear, fictionalize frequency and be lower than the sound of the lower frequency limit of loud speaker, thereby reach the purpose that strengthens bass effect.
In order making the bass effect that is produced to be regulated,, can between second adder 16 and inverting amplifier 18, to be connected into a volume adjuster 32 to satisfy different instructions for uses.
Have access to an effect process switch 34 between inverting amplifier 18 and the 3rd adder group 20, it is used to control the unlatching of this bass treatment circuit or close.
Claims (5)
1. bass treatment circuit, it is characterized in that: described bass treatment circuit includes first adder, low pass filter, three grades of band pass filter groups in parallel, second adder, inverting amplifier, the 3rd adder group and power amplifier, and the input of described first adder is connected with L channel input, R channel input; Described low pass filter is connected with first adder; Described three grades of band pass filter groups in parallel are made of the band pass filter of three parallel connections, and its three inputs all are connected in the output of described low pass filter, and three outputs connect into the input of described second adder; The output of described second adder connects into the input of described inverting amplifier; The output of described inverting amplifier connects into the input of the L channel adder in described the 3rd adder group and the input of R channel adder respectively; The input of described L channel adder is connected with described L channel input, and the input of described R channel adder is connected with described R channel input; Described the 3rd adder group connects into described power amplifier; Described power amplifier is connected with left channel loudspeaker and right channel loudspeaker.
2. bass treatment circuit as claimed in claim 1 is characterized in that: connect into a volume adjuster between described second adder and the described inverting amplifier.
3. bass treatment circuit as claimed in claim 1 or 2 is characterized in that: have access to an effect process switch between described inverting amplifier and described the 3rd adder group.
4. bass treatment circuit as claimed in claim 3 is characterized in that: the centre frequency of three band pass filters of described three grades of band pass filters in parallel is set to be mutually multiple.
5. bass treatment circuit as claimed in claim 4 is characterized in that: the bandwidth frequency of each band pass filter in described three grades of band pass filters in parallel is set to equal less than 10Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620120845 CN2938669Y (en) | 2006-06-29 | 2006-06-29 | Bass processing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620120845 CN2938669Y (en) | 2006-06-29 | 2006-06-29 | Bass processing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2938669Y true CN2938669Y (en) | 2007-08-22 |
Family
ID=38362697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620120845 Expired - Fee Related CN2938669Y (en) | 2006-06-29 | 2006-06-29 | Bass processing circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2938669Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102113315A (en) * | 2008-07-29 | 2011-06-29 | Lg电子株式会社 | Method and apparatus for processing audio signal |
| CN102932706A (en) * | 2012-10-22 | 2013-02-13 | 歌尔声学股份有限公司 | Headset with two built-in loudspeakers and signal processing method of headset |
| CN114167491A (en) * | 2021-12-07 | 2022-03-11 | 威海双丰物探设备股份有限公司 | Detector with source compensation circuit |
-
2006
- 2006-06-29 CN CN 200620120845 patent/CN2938669Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102113315A (en) * | 2008-07-29 | 2011-06-29 | Lg电子株式会社 | Method and apparatus for processing audio signal |
| CN102113315B (en) * | 2008-07-29 | 2013-03-13 | Lg电子株式会社 | Method and apparatus for processing audio signal |
| CN102932706A (en) * | 2012-10-22 | 2013-02-13 | 歌尔声学股份有限公司 | Headset with two built-in loudspeakers and signal processing method of headset |
| CN102932706B (en) * | 2012-10-22 | 2016-05-04 | 歌尔声学股份有限公司 | A kind of earphone of built-in double horn and its signal processing method |
| CN114167491A (en) * | 2021-12-07 | 2022-03-11 | 威海双丰物探设备股份有限公司 | Detector with source compensation circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070822 |