• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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    • 专利摘要:
    DYNAMIC LOW INTENSIFIER USING COMPRESSOR WITH BUILT-IN EQUALIZER There is a description of a system and method aimed at intensifying the low frequency response of a speaker for audio signals with relatively low input level and providing protection for the speakers as to relatively low level audio signals and providing protection for the speakers from relatively high level audio signals. The system comprising: a crossover network configured to separate an audio input signal into at least two frequency bands including a low frequency band; and a signal compressor responding to the energy level of the low frequency portion of an input audio signal in the low frequency range and configured to provide with amplification gain next to the low frequency portion of the input signal when the energy level the low frequency portion of the input signal is relatively low in order to intensify the low frequency response of the speaker, and attenuating the low frequency portion of the input signal when the energy level of the low portion (.. .).
    公开号:BR112012016797B1
    申请号:R112012016797-9
    申请日:2011-01-07
    公开日:2020-12-01
    发明作者:Scott Skinner；Christopher M. Hanna
    申请人:That Corporation；
    IPC主号:
    专利说明:

    Related Order Related Reference
    [001] This application is based on, claiming priority on, North American Provisional Patent Application No. 61/293005, entitled “Compressor Based Dynamic Bass Enhancement”, filed on January 7, 2010 in the names of Scott Skinner and Chris Hanna, being transferred to the present assignee (document number 056233-0438 (THAT-33PR)).
    [002] This application also consists of a continuation in part of the North American patent application No. 12/619653, entitled “Dynamic Volume Control and Multi-Spatial Processing Protection”, filed on November 16, 2009, in the names of Christopher M. Hanna, Gregory Benulis and Scott Skinner, being transferred to the present assignee (document number 056233-0427 (THAT-0026)), and the North American patent application 12/619655, entitled “Dynamic Volume Control and Multi- Spatial Processing Protection ”, filed on 16 November 2009 in the names of Christopher M. Hanna and Gregory Benulis, and assigned to the present assignee (document number 056233-0428 (THAT-0027)) (in the form of“ Co-pending Orders ”), both Co-pending Requests claiming priority over North American Provisional Requests No. 61/114684, filed on November 14, 2008 in the names of Christopher M. Hanna, Gregory Benulis and Scott Skinner; and 61/114777, filed on November 14, 2008 under the names of Christopher M. Hanna and Gregory Benulis.
    [003] The full content of each of these requests has been included in this report as a reference. Foundations Technical Field
    [004] This descriptive report refers to the reception and reproduction of audio, and more particularly, to systems and techniques developed to enhance the perceptual response of the bass from low-cost speakers, of the types typically incorporated in reproduction devices and audio and video reception, such as televisions and computers. Description of the Related Technique
    [005] Most consumers are more sensitive to visual quality than to sound quality. In order to keep costs to a minimum, manufacturers of electronic equipment aimed at consumers of audio and video systems, such as televisions and computers, are more likely to install speakers of little or no value with the systems. These speakers have a low frequency response (low) and are prone to distortion as the audio frequency is moving more towards the region referring to the point of low frequency resonance. In the case of more discerning consumers, the audio and video reproduction and reception systems are generally configured in such a way that additional speakers can be connected to the audio and video reproduction and reception systems designed to give greater quality that portion of audio and programming. summary
    [006] The report describes a system and technique aimed at improving the perceptual response of the bass of such speakers installed internally in a system that receives and reproduces the audio programming. The described system and technique also provide a low volume so that the sound is presented in a more intense way with higher quality, expanding the bandwidth of the speakers, without the need for connecting additional speakers.
    [007] In more specific terms, according to one aspect of the invention, there is a system designed to intensify the low frequency response of a speaker aimed at audio signals with a relatively low input level and giving protection to the high for audio signals with relatively high input levels. The system comprises: a crossover network configured to separate an audio input signal into at least two frequency bands, including a low frequency band; and a signal compressor meeting the energy level of the low frequency portion of an audio input signal in the low frequency range, being configured to provide amplification gain next to the low frequency portion of the input signal when the energy level the low frequency portion of the input signal is relatively low in order to intensify the low frequency response of the speaker, promoting attenuation of the low frequency portion of the input signal when the energy level of the low portion The frequency of the input signal is relatively high in order to provide protection against overload by the speakers.
    [008] According to other aspects, the crossover network is configured to separate the audio signal into two frequency ranges, and the system parameters are configurable to optimize a given speaker characteristic or the preference of the speaker. listener. Configurable parameters include one or more of the following components: cross frequency, compression ratio, maximum tolerable gain, high pass filter cutoff frequency, and desired level. In one type of mode, the compressor includes a RMS-based level detector for generating a signal representative of the energy level of the low-frequency portion of the incoming audio signal. According to another embodiment, a sum block is provided in order to provide an increased signal in the form of a compressed output function of the compressor signal provided in each remaining frequency range. A high-pass filter can be configured to respond to the increased signal, limiting the energy of the lowest frequency applied to the speaker. In addition, a peak delimiter can be configured to respond to the increased signal by limiting the maximum peak level of signal energy applied to the speaker. It must be obvious that the peak limiter can still be positioned in the low frequency range, before the sum and responsive to the compressor output. The system can also include a static equalizer configured to respond to the added signal, with the static equalizer including a lower limit greater than or equal to the crossover frequency of the crossover network so that the static equalizer, in combination with the compressor, functions as an equalizer. partially dynamic. According to a type of modality, the system is configured to intensify the low frequency response in reference to at least two speakers, intended for stereo reproduction of the channels, left and right, with the cross network being configured for separate the audio input signals from the left and right channels into at least two frequency bands, including a low frequency band; and the signal compressor responsive to the energy level of the low frequency portion of the left and right audio input signals in the low frequency range, configured to provide with amplification gain next to the low frequency portion of the audio input signals of left and right channels, when the energy level of the low frequency portion of the signals is relatively low, intensifying the low frequency response of each speaker, and providing attenuation of the low frequency portion of the input signals. audio from the left and right channels when the energy level of the low frequency portion of the signals is relatively high in order to provide protection for each speaker against an overload. Finally, according to another embodiment, the system may include a pair of sum blocks to provide a pair of summed signals in the form of a function of the compressed output signal of the left channel signal compressor and the corresponding signals of the frequency bands left channel, and the compressed output signal from the right channel signal compressor and the corresponding signals from the remaining tracks on the right channel. The system may further include a signal adder configured to provide a summed compressed signal representing the sum of the compressed output signals from the signal compressor of the left and right channels, and at least two sum blocks to provide the summed signals of the channel left and right channel in the form of a function of the added compressed signal and the portion of each signal of the right and left channel provided in each remaining frequency range.
    [009] According to another aspect, there is an architecture based on the two-track compressor for use with a loudspeaker. This architecture is configured in the form of a volume leveler, bass intensifier and protection device for the boxes.
    [010] According to another aspect, there is a method aimed at intensifying the low frequency response of a speaker with audio signals presenting a relatively high input level. The method consists of: separating an audio input signal into at least two frequency ranges including a low frequency range and compressing the low frequency portion of an audio input signal in the low frequency range so to provide with gain of amplification next to the low frequency portion of the input signal when the energy level of the low frequency portion of the input signal is relatively low in order to intensify the low frequency response of the speaker, and provide with attenuation of the low frequency portion of the input signal when the energy level of the low frequency portion of the input signal is relatively high in order to provide protection to the speakers against overload.
    [011] These, as well as other components, stages, characteristics, objectives, benefits, and advantages will become clear from a review of the detailed description that follows of the illustrative modalities, accompanying drawings and claims. Brief Description of Drawings
    [012] The drawings describe the illustrative modalities. They do not directly establish all the modalities. Other modalities may be used in addition to the current ones or not. The details that may become evident or unnecessary can be omitted, saving space for an illustration. more effective. Conversely, some modalities can be practiced without the presence of any of the details described. When the same numeral appears in the different drawings, it implies mentioning identical components or steps. We have the following drawings:
    [013] Fig. 1 consists of a block diagram of a modality of a bass intensification system configured in order to improve the perceptible bass response, and the tonal balance of the speakers, normally installed internally in the systems that include the ability to receive and reproduce the audio programming, as well as to intensify the volume of bass reproduced so that the sound comes to emphasize a better quality standard, with greater bandwidth for the speakers; Fig. 2 consists of a block diagram of a low frequency compressor shown and described with respect to Figs. from 1 to 5; Fig. 3 consists of an example of a typical frequency response graph of one of the intensified outputs from below (Lo or Ro in Fig. 1) for the different input levels; Fig. 4 consists of an example of the current measured output of a sample set of small speakers of the type incorporated into the video and audio systems; and Fig. 5 consists of a block diagram of a bass intensification system modality configured to add the low band signal together with the monophonic signal. Detailed Description of the Illustrated Modalities
    [014] There is then a discussion of the illustrated modalities. Other modalities can be added or not. The obvious or unnecessary details can be omitted for space saving or for a more effective presentation. Conversely, some modalities can be practiced without the presence of any of the details described.
    [015] Fig. 1 consists of a block diagram showing an example of a compressor-based bass enhancement system for use in enhancing the bass response of a speaker system. The bass boost system 10 includes inputs 12 and 14 configured to receive signals from the left and right channels of a stereo audio program respectively. The left channel input 12 is coupled to an LPF 16 input (low pass filter) and an HPF1 18 input (high pass filter). The input of the right channel 14 is coupled to an input of LPF 20 and an input of HPF1 22. The outputs of LPFs 16 and 20 are both connected to a low frequency compressor 24 configured to compress each signal and provide the signal compressed to a corresponding output of the compressor, with the signal on the left channel being coupled to the sum block 26, while the right channel is being coupled to the sum block 28. The compression of the portion of the audio signal applied to the compressor results in the amplification of small signals with the attenuation of the larger signals passed through the compressor, while applying the signal gain unit in some region in the intermediate part. Sum blocks 26 and 28 are further coupled to outputs HPF1 and HPF2 30 and 32, respectively, so that block 26 provides an added signal as a function of the left channel signal output of compressor 24 and the signal output of the left channel of the HPF1 18. Similarly, block 28 provides the added signal as a function of the signal output of the right channel of the compressor 24 and the signal output of the right channel of the HPF1 22. It then applies the added signal output of the left channel of block 26 next to the input of a second HPF2 30, with the application of the added signal output in the right channel of block 28 next to the input of the second HPF 32. The output of each filter HPF2 30 and HPF2 32 is applied to a respective peak limiter 34 and 36. The output of the limiter 34 is applied next to the equalizer 38 (EQ) configured to provide with at least one equalization function in two bands in the signal applied to the equalizer. EQ 38 provides output signal Lo from the left channel to output 42. Similarly, the output of limiter 36 is applied to EQ 40 configured to provide at least one two-band equalization function next to the applied signal to the equalizer. EQ 40 supplies the left channel Ro output signal to output 44. According to one modality, each EQ 38 and 40 consists of a static equalizer configured to respond to the signal applied next to its input by establishing a lower limit above the frequency crossover of the crossover network formed by filters 16, 18, 20 and 22 so that each static equalizer EQ 38 and 40 operates in the form of a partially dynamic equalizer.
    [016] LPFs 16 and 1, HPFs 20 and 22, the low frequency compressor 24 and sum blocks 26, 28 are combined to form an architecture based on two crossed bands. The architecture of the low-range compressor 24 may be similar to the volume dynamics control arrangement presented and described in the Co-pending Orders. For example, as shown in Fig. 2, the HPF outputs through the left channel 16 and HPF through the right channel 18 are applied next to the High Range DVC 200, while the LPF outputs through the left channel 18 and the LPF through the right channel 22 are applied next to the inputs of the Low Range DVC 202. The output of the High Range DVC 200 controls the amplifier gain 204 receiving the left channel output from the HPF 16, and controls the gain of the amplifier 206 receiving the output from the HPF right channel through right channel 20. The outputs of amplifiers 204 and 206 are respectively applied to sum blocks 26 and 28. Similarly, the output of the Low Range DVC 202 controls the gain of amplifier 208 by receiving the left channel output of LPF 18, and the gain of amplifier 210 receiving the output of the right channel of LPF 22. The outputs of amplifiers 208 and 210 are respectively applied to sum blocks 26 and 28. It should be noted that through the t change compression ratio of the High Range DVC 200 to 1: 1, so that the gain applied to amplifiers 204 and 206 becomes unit gain, the outputs of the HPF through the left channel 16 and the HPF through the right channel 18 pass through the amplifiers next to the respective sum blocks 26 and 28 in an unalterable way. In addition, the Low Range DVC 202 can be adjusted for several parameters including the desired level of change, the compression rate, the attack time constancy and the release time constancy along with the model of the intensification function of dynamic bass developed specifically for speaker systems receiving Lo and Ro outputs. In one type of modality, the Low Range DVC and High Range DVC each include an RMS level detector intended for use in gain control of amplifiers 204, 206 and corresponding amplifiers 208 and 210. In addition, amplifiers 204, 206, 208, 210 can each be presented in the form of voltage control amplifiers. It should be appreciated that other types of architectures and components may be employed. For example, other types of signal compressors can be used, as well as other types of level detectors, including peak and level detectors.
    [017] Taking Fig. 1 as a reference again, the compressor outputs of compressor 24 are added to the high range energy next to the outputs of HPF1 18 and 22 in order to complete the cross network. The HPF 30 and 32 limit the lowest frequency of reaching each speaker. This prevents the lower frequencies from being reasonably reproduced from reaching the box transmitter. Occasionally, the compressor can briefly deliver with a lot of gain (sound vibration) next to the low range input audio signal. The Peak Limiter is incorporated to protect the speaker against this phenomenon. The peak limiter is positioned after the crossover network to limit the combined audio peaks of the high and low bands by saturating the speakers. The equalizer (EQ) can be used to flatten the frequency response of the speaker to those frequencies above the low range. The combination of the improved tonal balance (EQ) with the improved low-frequency response (compressor-based dynamic enhancement) can provide with a dramatic improvement in the fidelity of the small speakers.
    [018] The desired level of the compressor is set relatively high when compared to the low input signal frequency levels. This results in the compressor typically adding gain in reference to the left and right low band audio input signals in order to preserve the desired low band output level. The gain volume is controlled both by the desired level of the compressor and the compression rate. The intensification of low volume can be increased by increasing the desired level of the desired compressor. The intensification of the low volume can be reduced by decreasing the desired level of the compressor. The intensification of the bass volume has a dynamic character, since the applied gain (or attenuation) next to the left and right input audio functions as a function of the input level. In a type of implementation, the compressor has a maximum gain limit. This limit helps to minimize the effect of the compressor along with the tonal balance of the audio. In addition to the intensification of the bass, the speakers are also protected from high levels of low-band energy. The compressor will attenuate the left and right input audio when the level exceeds the desired compressor level. The desired level of the compressor is typically adjusted to a level just below where the low range audio starts, causing distortion in the box. It should be understood that parameters such as cross frequency, target level, cutoff frequency of HPF2, peak limit, maximum gain limit and EQ setting can be adjusted, for optimized performance, depending on a given speaker. .
    [019] Fig. 3 shows an example of a frequency response graph for one of the outputs of the bass intensifier (Lo or Ro in Fig. 1) for different input levels. The input level is increased in steps of 6 dB. The excitation consists of a brief scanning sine wave (20-20KHz in less than a second). EQ 38 and 40 were avoided for the generation of this graph.
    [020] The response of the high range of Fig. 3 remained flattened since its passage took place without modifications. It displays the 6 dB level change for each scan. The low range came to show an intensification proportional to the entry level. Reference can be made to the level changes from each sweep around 150 Hz, shown in Fig. 3 in step 300. In the low range, the first of the two lowest input levels exhibits significant intensification. The fact that the two lower level curves are still around 5 dB of separation, in the low range, is indicative that the compressor 24 has reached its maximum possible gain. At these input levels, compressor 24 acts as a fixed intensifier. As the input level continues to increase, less intensification is added as the input level converges to the desired level of the compressor. Eventually, the frequency response becomes flattened. As the input level increases, the compressor 24 introduces a low band attenuation in order to provide protection to the speaker from being brought to levels that will cause high distortions. When the desired level is selected slightly below the maximum low-frequency transmission level, the compressor-based bass boost system provides as much boost as possible without causing the speaker to distort. When this feature is combined with the high range EQ (in order to flatten the high range response of the box), the low cost speakers exhibit much improved fidelity.
    [021] Fig. 4 shows the present measured output of a sample set of small speakers. The lowest level input response in step 400 represents the speakers without EQ or low-range compressor processing. The speakers have limited bandwidth and do not have a flattened response. The next answer in step 402 represents the same input level of low intensification in the low range and the high range EQ. In this case, the response is relatively flat, ranging from 150 Hz to 10 Hz.
    [022] In some circumstances it is desirable to make yourself available with equal bass boost for both speakers. Fig. 5 presents the low intensification system 500 that includes a sum block 502 configured to add the low band signals coming from each channel to provide a monophonic signal, which in turn comes to be applied together to each of the sum blocks 26 and 28. After the compressor, the L and R signals are attenuated by 6 dB and added together to create a low range monophonic signal. This leads to a homogeneous distribution of the bass energy equally between the two speakers and can result in a greater global perception of the bass's performance.
    [023] A merely illustrative discussion of the components, stages, characteristics, objectives, benefits and advantages was presented. None of them, not even the discussion related to them, is intended to limit the scope of protection in any sense. Other different modalities are also contemplated. They include modalities that incorporate a smaller or greater quantity of, and / or containing different components, stages, characteristics, objectives, benefits and advantages. Also included are modalities where the components and / or stages are positioned and / or organized differently.
    [024] For example, although the system has been described using two frequency bands, the system can make use of any number of bands when additional signal processing of individual bands is desired.
    [025] Unless otherwise stated, all measurements, values, rates, positions, magnitudes, sizes, and other types of specifications set forth in this specification, including the content of the claims below, are of a character approximate, without accuracy. They are intended to present a reasonable range in consistency with the functions to which they are related and with which they are usually present in the technical area of concentration.
    [026] All articles, patent applications, and other types of publications that have been mentioned through this report are incorporated into this document as a form of reference.
    [027] The term “geared mechanism” when used in a claim means that it must be interpreted covering the corresponding structures and materials that have been described, as well as their equivalents. Similarly, the term “turned stage” when used in a claim is intended to be interpreted as covering the corresponding acts that have been described as well as their equivalents. The absence of these expressions in a claim is not intended and should not be interpreted as restricting structures, materials, or acts or their corresponding equivalent formats.
    [028] Nothing that has been established or illustrated is intended or should be interpreted to promote a specification of any component, stage, characteristic, objective, benefit, advantage, or equivalent to the public, despite being mentioned or not in the claims framework.
    [029] The scope of protection is solemnly limited by the claims that follow. This scope should be interpreted as widely as possible with a basic interpretation of the language used in the claims when read in connection with this descriptive report and historical relationship, following and covering all structural and functional equivalents.
    权利要求:
    Claims (13)
    [0001]
    1.System (10) for enhancing low-frequency response from a speaker to relatively low input level audio signals and for protecting the speaker from relatively high input level audio signals, the system ( 10) comprising: cross network (16, 18, 20, 22) configured to separate an audio input signal into at least two frequency bands including a low frequency band; and signal compressor (24) responsive to the energy level of the low frequency portion of an input audio signal in the low frequency range and configured to provide amplification gain in the low frequency portion of the input signal when the energy level the low frequency portion of the input signal is relatively low in order to enhance the low frequency response of the speaker, and provide attenuation of the low frequency portion of the input signal when the energy level of the low frequency portion the input signal is relatively high in order to provide protection for the speakers against overload; wherein the system (10) is configured to enhance the low frequency response of at least two speakers for stereo reproduction of the right (14) and left (12) channel; the system (10) being CHARACTERIZED by the fact that the cross network (16, 18, 20, 22) is configured to separate the left (12) and right (14) audio input signals into at least two frequency bands including a low frequency band; and the signal compressor (24) is responsive to the energy level of the low frequency portion of the left and right audio input signals in the low frequency range and configured to provide amplification gain in the low frequency portion of the input signals of audio of the left (12) and right (14) channels when the energy level of the low frequency portion of each signal is relatively low in order to intensify the low frequency response of each speaker, and provide attenuation of the low frequency portion of each of the left (12) and right (14) audio input signals when the energy level of the low frequency portion of each of the signals is relatively high in order to provide protection for each speaker against overload in which the system (10) also includes a signal adder (502) configured to provide a summed compressed signal representing the sum of the compressed output signals of the signal compressor (24) of the left (12) and right (14) channels, and at least two sum blocks (26, 28) for supplying summed signals from the left (12) and right (14) channels as a function of the added compressed signal and the portion of each left (12) and right (14) channel signal provided in each remaining frequency range.
    [0002]
    2.System (10), according to claim 1, CHARACTERIZED by the fact that the cross network (16, 18, 20, 22) is configured to separate the audio signal into two frequency bands.
    [0003]
    3.System (10), according to claim 1, CHARACTERIZED by the fact that the system parameters (10) are configured to optimize a given characteristic to the speaker or a listener preference.
    [0004]
    4.System (10), according to claim 3, CHARACTERIZED by the fact that the configurable parameters include one or more of: cross frequency, compression rate, maximum allowable gain, cut-off frequency of high-pass filter and desired level.
    [0005]
    5.System (10), according to claim 1, CHARACTERIZED by the fact that the compressor (24) includes a level detector based on the RMS to generate a signal representative of the RMS energy level of the low frequency portion input audio signal.
    [0006]
    6. The system (10) according to claim 1, CHARACTERIZED by the fact that it also includes a sum block (26, 28) intended to provide an added signal as a function of the compressed output of the signal compressor signal (24) provided in each of the remaining frequency bands.
    [0007]
    7. The system (10), according to claim 6, CHARACTERIZED by the fact that it will also include a high frequency filter (30, 32) configured to respond to the added signal and limiting the energy of the lowest frequency applied next to the high -speaker.
    [0008]
    8. The system (10), according to claim 6, FEATURED by the fact that it also includes a peak limiter (34, 36) configured to respond to the added signal and limit the maximum peak level of the signal energy applied to the loudspeaker. speaker.
    [0009]
    9. The system (10) according to claim 6, CHARACTERIZED by the fact that it also includes a peak limiter (34, 36) configured, before the sum block (26, 28), to respond to the compressed output of the compressor signal (24) and limit the maximum peak level of signal energy only in the low frequency range.
    [0010]
    10. The system (10), according to claim 6, CHARACTERIZED by the fact that it also includes a static equalizer (38, 40) configured to respond to the added signal and include a lower limit, greater than or equal to the crossover frequency of the crossover network ( 16, 18, 20, 22) so that the static equalizer (38, 40), when combined with the low range compressor (24), partially functions as a dynamic equalizer.
    [0011]
    11. The system (10) according to claim 1, CHARACTERIZED by the fact that it also includes a pair of sum blocks (26, 28) for supplying a pair of summed signals as a function of the compressed output signal of the compressor signal (24) of the left channel (12) and of the signals corresponding to the remaining frequency bands of the left channel (12), and of the compressed output signal of the signal compressor (24) of the right channel (14) and of the signals corresponding to the remnants of the right channel (14).
    [0012]
    12. Method aimed at intensifying the low frequency response of at least two speakers for relatively low input level audio signals and protecting the speakers for relatively high input level audio signals, CHARACTERIZED by the fact of the method to understand: separation of each one between a right and a left audio input signal in at least two frequency bands, including a low frequency band; and compression of the low frequency portion of each of the right and left audio input signals (12, 14) in the low frequency range in order to provide an amplification gain next to the low frequency portion of each of the signals left and right audio input (12, 14) when the energy level of the low frequency portion of each of the left and right audio input signals (12, 14) is relatively low in order to intensify the response low frequency input of each of the speakers, and will provide an attenuation of the low frequency portion of each one of the right and left audio input signals (12, 14) when the energy level of the low portion the frequency of each of the right and left audio input signals (12, 14) is relatively high in order to provide protection against overload in each of the speakers.
    [0013]
    13. Method according to claim 12, CHARACTERIZED by the fact that it also includes the provision of a summed signal pair as a function of the compressed output signal of the signal compressor (24) of the left audio input signal (12) and the corresponding signals from the remaining frequency bands of the left audio input signal, and the compressed output signal from the signal compressor (24) of the right audio input signal (14) and the corresponding signals from the remaining bands of the audio signal. right audio input (14).
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    法律状态:
    2019-01-08| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-04-22| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|
    2020-08-11| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-12-01| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 07/01/2011, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US29300510P| true| 2010-01-07|2010-01-07|
    US61/293,005|2010-01-07|
    PCT/US2011/020445|WO2011085148A1|2010-01-07|2011-01-07|Compressor based dynamic bass enhancement with eq|
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