US20150146890A1 - Adaptive bass processing system - Google Patents

Adaptive bass processing system Download PDF

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Publication number
US20150146890A1
US20150146890A1 US14/404,381 US201314404381A US2015146890A1 US 20150146890 A1 US20150146890 A1 US 20150146890A1 US 201314404381 A US201314404381 A US 201314404381A US 2015146890 A1 US2015146890 A1 US 2015146890A1
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recited
loudness
harmonic
low frequency
harmonics
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US14/404,381
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English (en)
Inventor
Jun Yang
Klaas Vogelsang
Robert Ridder
Steven Verity
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Creative Technology Ltd
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Creative Technology Ltd
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Assigned to CREATIVE TECHNOLOGY LTD reassignment CREATIVE TECHNOLOGY LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: VOGELSANG, Klaas, YANG, JUN, RIDDER, Robert, VERITY, STEVE
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S1/00—Two-channel systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
    • H04S7/30—Control circuits for electronic adaptation of the sound field
    • H04S7/307—Frequency adjustment, e.g. tone control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic

Definitions

  • the present invention relates to methods for enhancing bass in audio reproduction systems. More particularly, the present invention relates to the exploitation of psychoacoustic principals to increase the perception of bass to listeners in audio reproduction systems. This invention proposes an effective and simple psychoacoustic bass generation scheme with good audio performance.
  • a more advanced approach is to use psychoacoustic signal processing to enhance bass perception on the basis of the “principle of the missing fundamental.”
  • NLP Nonlinear Processor
  • Some available psychoacoustic bass systems use harmonic generators that only produce even harmonics or odd harmonics, not all harmonics. In addition, even though harmonics are needed, not all the NLPs generate the same perceptual bass perception.
  • harmonics in some available bass enhancement systems will diminish when the input signal level is low or when the cutoff frequency (fc) of the speaker is very low. Further still, many available psychoacoustic bass systems apply a linear gain to control the harmonic strength in the system output and don't consider the loudness matching between the generated harmonics and the original low frequencies.
  • a bass generation system includes six processing units: (1) an adaptive low frequency signal extractor; (2) an adaptive adjustor of harmonic decay pattern; (3) a nonlinear processor (NLP) for generating the desired harmonic signals with the inter-modulation under control; (4) a high-pass filter to obtain the harmonics which are well-reproduced by the loudspeaker; (5) a loudness matching block to compensate for the loudness of the desired harmonics with the original low frequency signal which is unable to be reproduced by the loudspeaker so as to generate the psychoacoustic bass; and (6) an output mixer which sums the high-pass filtered raw data with the psychoacoustic bass.
  • NLP nonlinear processor
  • the method for generating psychoacoustic bass comprises an effective nonlinear processor having an adjustable harmonic decay pattern coupled to an adaptive automatic adjustor of harmonic decay pattern
  • a system configured for generating psychoacoustic bass comprises an adaptive adjustor of harmonic decay pattern.
  • the system provides compensation for the loudness of the desired harmonics for the original low frequency signal which is unable to be reproduced by the loudspeaker.
  • the degree of nonlinearity consistently reaches a desired value while remaining independent of the cutoff frequency of speakers and the level of the input audio signal. Therefore, the proposed systems and methods provide listeners with good sensation of the low frequency of the sound signal even when bass restricted loudspeakers or other poor loudspeakers are used. Accordingly, the invention embodiments offer an effective solution for a variety of bass enhancement and generation applications.
  • FIG. 1 is a block diagram illustrating a Mono Psychoacoustic Bass System in accordance with one embodiment of the present invention.
  • FIG. 2 is a graphical representation illustrating a spectrum of the input and output of a non-linear processor in accordance with one embodiment of the present invention.
  • FIG. 3 is a diagram illustrating further details of the Loudness Matching block shown in FIG. 1 , in accordance with one embodiment of the present invention.
  • FIG. 4 is a block diagram illustrating a Mono Psychoacoustic Bass System in accordance with one embodiment of the present invention.
  • FIG. 5 is a block diagram illustrating a Mono Psychoacoustic Bass System in accordance with one embodiment of the present invention.
  • FIG. 6 is a block diagram illustrating a Stereo Psychoacoustic Bass System in accordance with one embodiment of the present invention.
  • FIG. 7 is a block diagram illustrating a simplified Stereo Psychoacoustic Bass System having a reduced number of high-pass filters in accordance with one embodiment of the present invention.
  • FIG. 8 is a block diagram illustrating a simplified Stereo Psychoacoustic Bass System having a simplified low frequency extractor in accordance with one embodiment of the present invention.
  • the bass generation system in accordance with embodiments of the present invention include adaptive adjustment of harmonic decay pattern and a specialized non-linear processor (NLP).
  • the non-linear processor is preferably controllable to reduce inter modulation; the non-linearity is controlled to remain independent of the cutoff frequency of speakers and the level of the input audio signal
  • FIG. 1 illustrates one embodiment of the invention.
  • the bass generation system 100 preferably includes six processing units applied to modify an audio input signal 101 : (1). low frequency signal extractor 102 , (2). automatic adjustor of harmonic decay pattern 104 , (3). nonlinear processor (NLP) 106 for generating the desired harmonic signals, (4). high-pass filter 108 to obtain the harmonics that can be reproduced well by the loudspeaker, (5). loudness matching block 110 to match the loudness of the desired harmonics with the original low frequency signal which is unable to be reproduced by the loudspeaker so as to generate the psychoacoustic bass, and (6). output mixer 112 which sums the high-pass filtered raw data 114 a with the strength-controlled psychoacoustic bass 118 .
  • NLP nonlinear processor
  • the Low Frequency Signal Extractor 102 preferably consists of two cascaded second order IIR filters, which are related to the cutoff frequency fc of the speakers.
  • the Harmonic Decay Rate Adjustor 104 is implemented, in a preferred embodiment, by an automatic gain related to the input level or fc.
  • the Energy Detector 121 is used to provide an adjustment control signal 125 to the harmonic decay rate adjustor 104 . Details for one of the implementations are as follows.
  • EnergyEnv — LF ( n ) EnergyEnv — LF ( n ⁇ 1)+ k *(
  • the Nonlinear Processor is designed as a fifth order polynomial in one embodiment.
  • One non-limiting example of the NLP is as follows,
  • FIG. 2 shows the spectrum of the input and output of the proposed fifth order NLP.
  • This proposed NLP doesn't require the LPF at the output of NLP; in contrast, the conventional psychoacoustic bass systems typically need a LPF to reduce the strength of the undesired higher harmonics in order to avoid distortion.
  • FIG. 2 illustrates an input 202 at 130 Hz.
  • fundamental frequency output signals 204 , 205 , and 206 respectively at about 260 Hz., 320 Hz., and 420 Hz.
  • HPF 1 reference number 114
  • HPF 2 reference number 108
  • HPF 1 and HPF 2 are preferably the same IIR filters to increase the loudspeaker efficiency.
  • the HPF 2 also functions to filter out the DC component for better estimation of the energy.
  • the Harmonic Strength 116 applied for the psychoacoustic bass is preferably a user adjustable parameter.
  • Loudness Matching block 110 Energy Detector 121 has been described in Equation (1).
  • the Loudness Mapping could be implemented in linear domain (rather than in dB domain) as follows
  • ⁇ is the expansion ratio which is between 1.1 and 2.0 and related to the fc.
  • the parameter c is a factor around 1.0.
  • a look-up table method or polynomial approximation could be adopted to implement the power function for reducing the computational complexity.
  • FIG. 3 A sophisticated implementation of the Loudness Mapping 122 (from FIG. 1 ) is shown as in FIG. 3 .
  • the low frequency energy for the low frequency extracted signal is determined.
  • the energy value is converted from a linear value to a decibel value.
  • a loudness calculation is then made for the low frequency energy in step 306 .
  • a dB calculation is made for the same loudness value that corresponds to the desired harmonics.
  • the dB value is converted to a Linear value resulting in a determination of the desired energy level of the harmonics in step 312 .
  • This value is then used to provide a gain estimation (see gain estimator 123 ) when the energy level detected for the harmonics 124 is compared with the desired energy of the harmonics (step 312 ).
  • Loudness ⁇ ( phon ) 4.2 + a ⁇ ( f ) ⁇ ( Energy - T ⁇ ( f ) ) 1 + b ⁇ ( f ) ⁇ ( Energy - T ⁇ ( f ) ) ( 5 )
  • FIG. 4 A simplified psychoacoustic bass system 400 is depicted in FIG. 4 , in which the HPF 1 (reference number 114 ) of FIG. 1 is implemented by subtracting the extracted low-frequencies 402 from the raw audio data 101 .
  • FIG. 5 Another simplified psychoacoustic bass system 500 is illustrated in FIG. 5 .
  • Replacing the Loudness Matching block ( 110 in FIG. 1 ) by a Loudness Compressor 504 will further save the MIPS with acceptable performance of the low frequency sensation.
  • the loudness Compressor is implemented by an Energy Detector, Gain Calculator, and a smoother. As the NLP might result in the excessive expansion effect, the Loudness Compressor will compensate for the excessive expansion based on the Equal Loudness Contours in the low frequency range of interest.
  • the proposed mono schemes could be easily generalized to the cases of stereo input or more than two channel inputs.
  • One embodiment of the invention for the stereo input case is shown in FIG. 6 , which is based on the mono system of FIG. 1 .
  • the HPF 1 reference number 114
  • HPF 2 reference number 116
  • HPF3 reference number 614
  • the first and second input audio channels ( 101 a , 101 b ) are combined, then the combined signal is processed by the low frequency extractor 102 .
  • the psychoacoustic bass signal 611 is added respectively in adders/mixers 612 , 613 to the high pass filtered left channel signal 114 a and the high pass filtered right channel signal 614 a to generate respectively the left out signal 612 a and the right out signal 613 a.
  • FIG. 7 shows a simplified stereo psychoacoustic bass system 700 which saves (i.e., reduces the need for) two HPFs. It is based on the mono system of FIG. 4 . That is, the high pass filter functionality shown by high pass filter 114 and 614 in FIG. 6 are replaced by subtracting the low frequency extracted signal 702 a from the left channel input signal 101 a and the right channel input signal 101 b.
  • FIG. 8 is a block diagram illustrating a simplified Stereo Psychoacoustic Bass System 800 having a simplified low frequency extractor in accordance with one embodiment of the present invention.
  • the left input signal 101 a and the right input signal 101 b are combined in adder 802 .
  • the high pass filtered signals 114 a and 614 a derived respectively form these input channel signals are combined in adder 804 .
  • the combined high pass filtered signals 804 a are then subtracted from the combined input signals in adder 806 to generate an extracted low frequency signal 806 a.
  • the psychoacoustic bass processing is performed with a single band, but it could be easily generalized to the cases of multiple bands. Utilizing up to three bands processing should provide more than satisfactory performance for the speakers with fc less than 1000 Hz.
  • An effective NLP is used so as to avoid a Low Pass Filter (LPF) at the output of NLP and to reduce the artifacts.
  • LPF Low Pass Filter
  • the harmonics of the present inventive system will not diminish when the input level is low or when the cutoff frequency of the speaker is very low.
  • the harmonic decay rate can be controlled by either the above block or by adjusting the coefficients of the NLP.
  • this invention greatly enhances the perceived low frequency sensation.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
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CN104471961A (zh) 2015-03-25
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SG11201407708YA (en) 2014-12-30
EP2856777A4 (en) 2016-05-25
EP2856777A1 (en) 2015-04-08
US20190141441A1 (en) 2019-05-09
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US10750278B2 (en) 2020-08-18
CN108989950B (zh) 2023-07-25
EP2856777B1 (en) 2020-04-15

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