CN1877988A - Sound quality adjustment device - Google Patents
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- CN1877988A CN1877988A CN 200610091610 CN200610091610A CN1877988A CN 1877988 A CN1877988 A CN 1877988A CN 200610091610 CN200610091610 CN 200610091610 CN 200610091610 A CN200610091610 A CN 200610091610A CN 1877988 A CN1877988 A CN 1877988A
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Abstract
LPF and HPF extract bass and treble ranges, respectively, from an input sound signal, and bass and treble boost circuits perform dynamic range expansion/contraction on the extracted bass- and treble-range sound signals in accordance with input levels of the sound signals. The input sound signal and the sound signals output from the boost circuits are added together. There may also be provided coefficient calculation sections for calculating filter coefficients on the basis of the levels of the sound signals extracted by the LPF and HPF. In this case, the bass and treble boost sections perform, in accordance with the filter coefficients calculated by the corresponding coefficient calculation sections, filter processes for increasing/decreasing the levels of the bass and treble ranges, respectively.
Description
Technical field
The present invention relates to be used for the sound quality adjustment device of various audio frequency apparatuses and television receiver.
Background technology
The example of the sound quality adjustment device that is used for various audio frequency apparatuses is disclosed in Japanese patent publication No.3206271 and 3329050.Figure 13 is the block diagram that is illustrated in the general structure of disclosed sound quality adjustment device in above-mentioned No.3206271 and 3329050 publications.In the sound quality adjustment device of Figure 13, respectively by the left side (L) of attenuator 100a and 100b decay dual track-promptly and right (R) sound channel-input audio frequency or voice signal, then by the level of the special frequency band of pitch filter 101a and 101b reinforcement or enhancing (boost) these dual track input audio signals.Then, determine parts 102 definite voice signals that strengthen like this by level, and, change the filter factor of pitch filter 101a and 101b, so that realize desired sound quality adjusting by enhancing amount calculating unit 103 based on the result that level is determined.
Yet, adopt the conventional acoustic quality regulator of Figure 13, in detection based on the level of the voice signal of handling by pitch filter 101a and 101b, regulate by FEEDBACK CONTROL under the situation of level enhancing amount of pitch filter 101a and 101b, will such problem appears, that is, the quick level with respect to any input audio signal changes level enhancing amount adjusting existence delay.Therefore, for example, when the level of any input audio signal increases fast, before suitably suppressing level enhancing amount by FEEDBACK CONTROL, need considerable time, thereby may be for example owing to overflowing of Digital Signal Processing causes " slicing (clipping) ", and the tie point of regulating in the enhancing amount may produce the slicing sound of not expecting.
Summary of the invention
In view of preamble, the purpose of this invention is to provide a kind of improved sound quality adjustment device, it can the high-speed response sound signal level change.
To achieve these goals, the invention provides a kind of sound quality adjustment device, it comprises in the voice signal of a plurality of sound channels at least one: filter circuit, and it extracts the voice signal of predetermined frequency band from input audio signal; Intensifier circuit, it carries out dynamic range expansion/contraction according to the incoming level of voice signal to the voice signal that is extracted by described filter circuit; And adder, it is with input audio signal and added together by the voice signal of described intensifier circuit output.
Compare with known sound quality adjustment device traditionally, by adopting basis acoustic information to be carried out the feed-forward arrangement of dynamic range expansion/contraction by the level of the voice signal of filter circuit extraction, the present invention can respond the variation of sound signal level apace.As a result, even when having the quick increase of input audio signal level, the present invention also can prevent to produce unnecessary slicing sound effectively.
Preferably, at this at least one voice signal, sound quality adjustment device also comprises subtracter, and it deducts the voice signal that is extracted by filter circuit from input audio signal.Input audio signal after adder will deduct and added together by the voice signal of intensifier circuit output.By the subtracter that deducts the voice signal that filter extracts from input audio signal is provided, the present invention can prevent and will carry out decline (dip) in the frequency band that sound quality regulates to it, thereby realizes the smooth connection between the frequency characteristic of sound.
Preferably, at this at least one voice signal, the attenuation processing circuit that provides between filter circuit and the intensifier circuit also is provided sound quality adjustment device, is used for basis and is little by little decayed or the minimizing output level by the reduction of the level of the voice signal of filter circuit extraction.By between filter circuit and intensifier circuit, providing attenuation processing circuit, the present invention can suppress too fast variation from the level of the voice signal of adjusting device output, thereby give the sense of hearing of audience's nature.
Preferably, sound quality adjustment device also comprises the normalization treatment circuit, and it uses the corresponding identical or common gain factor of maximum level with the voice signal of multichannel, to the voice signal execution dynamic range expansion/contraction of each sound channel.By such configuration, the present invention can avoid effectively hour being difficult to hear sound in volume, eliminate the trouble that sound becomes too loud when giving great volume simultaneously.In addition, the present invention can reduce the sound volume difference that causes owing to the difference between the audio-source etc., thereby eliminates the needs that user's frequent volume is handled.
According to a further aspect in the invention, provide a kind of sound quality adjustment device, it comprises in the voice signal of a plurality of sound channels at least one: extract parts, it extracts the voice signal of predetermined frequency band from input audio signal; The coefficient calculations parts, it is based on the level by the voice signal that extracts the parts extraction, calculating filter coefficient; And the Filtering Processing parts, it is according to by the filter factor of coefficient calculations component computes, carries out the Filtering Processing of the predetermined frequency band sound signal level that is used to increase/reduce input audio signal.
Compare with known sound quality adjustment device traditionally, be used for feed-forward arrangement according to the filter factor of real time altering Filtering Processing parts by the level that extracts the voice signal that parts extract by employing, the present invention can respond the variation of sound signal level apace.As a result, even when having the quick increase of input audio signal level, the present invention also can prevent to produce unnecessary slicing sound effectively.
Preferably, at this at least one voice signal, sound quality adjustment device also is included in the attenuation processing parts that provide between parts and the Filtering Processing parts is provided, and attenuation processing parts basis is the output level of little by little decaying by the reduction of the level of the voice signal that extracts the parts extraction.By between filter circuit and intensifier circuit, providing attenuation processing circuit, the present invention can suppress too fast variation from the level of the voice signal of adjusting device output, thereby give the sense of hearing of audience's nature.
Various details embodiment, but should be appreciated that the present invention is not limited to described embodiment, and under the situation that does not deviate from basic principle, various modifications of the present invention are possible.Therefore, scope of the present invention only is indicated in the appended claims.
Description of drawings
In order to understand purpose of the present invention and other feature better, will be described in greater detail with reference to the attached drawings the preferred embodiments of the present invention below, wherein:
Fig. 1 is the block diagram that illustrates according to the operated by rotary motion of the sound quality adjustment device of first embodiment of the invention;
Fig. 2 is the block diagram that the example structure of the bass bossting circuit among first embodiment is shown;
Fig. 3 is the figure that the example I/O characteristic of the bass bossting circuit among first embodiment is shown;
Fig. 4 is the block diagram that illustrates according to the operated by rotary motion of the sound quality adjustment device of second embodiment of the invention;
Fig. 5 is the figure that the example I/O characteristic of the bass bossting circuit among second embodiment is shown;
Fig. 6 is the block diagram according to the sound quality adjustment device of third embodiment of the invention;
Fig. 7 is the example I/O time response figure that the attenuation processing circuit among the 3rd embodiment is shown;
Fig. 8 is the block diagram that illustrates according to the operated by rotary motion of the sound quality adjustment device of fourth embodiment of the invention;
Fig. 9 is the figure that the example I/O characteristic of the normalization treatment circuit among the 4th embodiment is shown;
Figure 10 is the block diagram that illustrates according to the operated by rotary motion of the sound quality adjustment device of fifth embodiment of the invention;
Figure 11 is the example I/O time response figure that the attenuation processing parts among the 5th embodiment are shown;
Figure 12 A and 12B are the figure that the example frequency characteristic of the bass bossting circuit among the 5th embodiment is shown; And
Figure 13 is illustrated in the block diagram of the operated by rotary motion of known sound quality adjustment device traditionally.
Embodiment
[first embodiment]
Fig. 1 is the block diagram that illustrates according to the operated by rotary motion of the sound quality adjustment device of first embodiment of the invention.This sound quality adjustment device comprises: low pass filter (below be called as " LPF ") 1, high pass filter (below be called as " HPF ") 2, bass bossting circuit 3, treble boosting circuit 4, multiplier 5,6 and 7, and adder 8.
With the behavior of describing according to the sound quality adjustment device of first embodiment.Take the LPF 1 of IIR (infinite impulse response) filter form to be extracted in frequency and be lower than for example second sound signal of the bass range of hundreds of hertz from input audio signal (first voice signal).Bass bossting circuit 3 is carried out dynamic range expansion/contraction according to the incoming level of second sound signal to the second sound signal that is extracted by LPF 1.
Fig. 2 is the block diagram that the structure of bass bossting circuit 3 is shown, and it comprises amplifier 30, level detection parts 31 and gain table 32.Level detection parts 31 detect from the level of the second sound signal of LPF 1 output.Gain table 32 interrelatedly is stored in the gain coefficient of input audio signal level and amplifier 30 wherein in advance.Read and the corresponding certain gain coefficient of level that detects by level detection parts 31 from gain table 32, and provide it to amplifier 30.In the incoming level and the relation between the gain coefficient in being stored in gain table 32, linear-logarithmic conversion, ratio calculating, log-linear conversion process have been incorporated into.Therefore, each value by gain table 32 conversions directly can be set to import the gain of data.Amplifier 30 will multiply by from the gain coefficient of gain table 32 outputs from the second sound signal of LPF 1 output, thus the second sound signal behind the output multiplication.By this way, present embodiment can be carried out dynamic expansion/compression according to the level of voice signal.
Also take the HPF 2 of iir filter form to be extracted in frequency and be higher than for example the 3rd voice signal of the high pitch scope of several KHz from first voice signal of being imported.Treble boosting circuit 4 is carried out dynamic range expansion/contraction according to the incoming level of the 3rd voice signal to the 3rd voice signal that is extracted by HPF 2.The structure of treble boosting circuit 4 is similar to the structure of bass bossting circuit 3.
Fig. 3 shows the example I/O characteristic of the bass bossting circuit 3 among first embodiment, and wherein transverse axis is represented the incoming level by the second sound signal of LPF 1 extraction, and the longitudinal axis is represented the output level of bass bossting circuit 3." linearity " expression linear characteristic, wherein the input and output level is 1: 1 a ratio.As shown in, when sound import is small volume, increase gain (promptly, increase the gradient of I/O characteristic), with the bass component of enhancing sound, and when sound import has big volume, reduce gain (promptly, reduce the gradient of I/O characteristic), bass component is strengthened or sound strengthens to suppress.
As shown in Figure 3, when incoming level was near 0dB, the output level of bass bossting circuit 3 reduced fast.The reason that so fast reduces output level is to prevent the slicing exported.Just, in the present embodiment of sound quality adjustment device, bass component in being present in first voice signal and under the situation that first voice signal extracts and the bass component that strengthened by bass bossting circuit 3 is added together, if give great volume, then there is the possibility of output clipped wave.For fear of slicing, present embodiment is configured to when volume is very big, reduces the output level of bass bossting circuit 3.
In addition, as shown in Figure 3, can prepare in advance (promptly, storage in advance in gain table 32) a plurality of different types of I/O characteristic of bass bossting circuit 3, for example, be used to realize minimum bass reinforced effects (" MIN ") the I/O characteristic, be used to realize in the middle of the I/O characteristic of bass reinforced effects (" MID ") and the I/O characteristic that is used to realize maximum bass reinforced effects (" MAX ").In this case, gain table 32 comprises and the corresponding a plurality of tables of a plurality of different types of I/O characteristics, and the user can select in MIN, MID and the MAX characteristic any one.Can be the I/O characteristic of treble boosting circuit 4 to be set with similar mode shown in Figure 3.
Because strengthen the bass component of extracting from first voice signal by bass bossting circuit 3 as mentioned above, then it is added to first voice signal, so present embodiment allows the bass range volume in the whole volume other near predetermined volume, thereby even when sound source has a spot of bass component, also can give sound with " strength (punch) ".Similarly, because strengthen the treble components of extracting from first voice signal by treble boosting circuit 4 as mentioned above, then it is added to first voice signal, so even when sound source has a spot of treble components, present embodiment also can make sound " soft (modulation) ".
In addition, compare at known sound quality adjustment device traditionally with shown in Figure 13, because present embodiment is used for carrying out according to the level of bass that is extracted by LPF 1 and HPF 2 and treble components the feed-forward arrangement of the dynamic range expansion/contraction of bass and treble components, rather than adopt the feedback of the level be subjected to the voice signal that sound quality regulates, so can responding sound signal level apace, it changes.As a result, even when having the quick increase of input audio signal level, present embodiment also can suppress the enhancing of bass and treble components rapidly, thereby prevents to generate unnecessary slicing sound.
[second embodiment]
Next, second embodiment of the present invention will be described.Fig. 4 is the block diagram according to the sound quality adjustment device of second embodiment of the invention, wherein is similar to element among Fig. 1 to be same as Reference numeral representation class among Fig. 1.By subtracter 9 and 10 being added in each element of above-mentioned first embodiment, structure is according to the sound quality adjustment device of second embodiment.Subtracter 9 deducts the second sound signal of bass range from first voice signal, and output has been subjected to first voice signal (that is, deduct after first voice signal) of subtraction.Subtracter 10 deducts the second sound signal of high pitch scope from first voice signal, and output has been subjected to first voice signal (that is, deduct after first voice signal) of subtraction.
Therefore, except the benefit that is provided by first embodiment, second embodiment can also provide following favourable benefit.Adopt above-mentioned first embodiment, under will extracting and be added to the original situation that is present in bass first voice signal and treble components from first voice signal by intensifier circuit 3 and 4 basses that strengthen and treble components, in bass and high pitch scope factitious decline (sound dies down) may take place undesirably, this will cause the unsmooth connection between the frequency characteristic of sound.This trouble for fear of first embodiment, dispose second embodiment by this way, promptly, excise bass range by subtracter 9 from first voice signal, simultaneously, from first voice signal excision high pitch scope, make first voice signal that has passed through subtracter 10 will only have the component of intermediate range by subtracter 10.Therefore, in by adder 8 additions, might prevent the bass component of first and second voice signals added togetherly, and prevent the treble components of the first and the 3rd voice signal added together.By this way, second embodiment can prevent the decline in bass and the high pitch scope effectively, thus the smooth connection between the frequency characteristic of realization sound.
Fig. 5 shows the example I/O characteristic of the bass bossting circuit 3 among second embodiment.In a second embodiment, can the I/O characteristic of bass bossting circuit 3 be set in the mode identical substantially with first embodiment.Although when incoming level is near the 0dB, reduce the output level of the bass bossting circuit 3 among first embodiment apace, but when incoming level is near 0dB, do not need to reduce the output level of the bass bossting circuit 3 among second embodiment, this is because as mentioned above, can not descend in bass and high pitch scope.Can with the similar mode of bass bossting circuit shown in Figure 53, the I/O characteristic of the treble boosting circuit 4 among second embodiment is set.
[the 3rd embodiment]
Next, the third embodiment of the present invention will be described.Fig. 6 is the block diagram according to the sound quality adjustment device of third embodiment of the invention, wherein is similar to element in Fig. 1 or 4 to be same as Reference numeral representation class in Fig. 1 or 4.By add attenuation processing circuit 11 between LPF 1 and bass bossting circuit 3, structure is according to the sound quality adjustment device of the 3rd embodiment.
Attenuation processing circuit 11 is such circuit, and it is used for reducing according to the level of the second sound signal of the bass range of being extracted by LPF 1, little by little decay or minimizing output level.Fig. 7 shows the example I/O time response of the attenuation processing circuit 11 among the 3rd embodiment, transverse axis express time wherein, and the longitudinal axis is represented sound signal level.The second sound signal that " IN " expression is extracted by LPF 1, and the output signal of " OUT " expression attenuation processing circuit 11.
As shown in Figure 7, when having imported impact sound signal IN, attenuation processing circuit 11 attenuates sound signal little by little in predetermined release time, and do not make the level of output signal OUT follow voice signal IN, wherein the level of this voice signal IN reduces after presenting maximum apace.In the 3rd embodiment, carry out attenuation processing, wherein attenuation rate non-linearly increases according to the process of time.By this way, after in the bass range of extracting by LPF 1, having taken place to be similar to the variation of impact, suppress the variation of output level immediately, then, when through preset time, increase the decay of output level, thereby the 3rd embodiment can give the sense of hearing of audience's nature.
In order to realize such attenuation processing, with predetermined time interval the voice signal that is input to attenuation processing circuit 11 is sampled, and between the sample value of current time and the output valve in last sampling time, compare, so that the higher value of two sample values being compared is chosen as the output valve of current time.Therefore, when the input audio signal level increases, select up-to-date sample value unchangeably, thereby the output level of attenuation processing circuit 11 increases according to incoming level.Yet, when the input audio signal level reduces, select the output valve in last sampling time, in this case, the value in the last sampling time of decaying is set to the output valve of current time with it.In this case, as mentioned above, attenuation rate increases along with the process of time, and the level ratio of next sampling in, use the output valve of this output valve as the last sampling time.
As mentioned above, the 3rd embodiment with attenuation processing circuit 11 can suppress the excessive level variation of bass range, thereby gives the sense of hearing of audience's nature.Though the 3rd embodiment has been described to be included in the attenuation processing circuit 11 that provides between LPF1 and the bass bossting circuit 3, also can between HPF 2 and treble boosting circuit 4, provide such attenuation processing circuit.In addition, also can be with such attenuation processing circuit application in first embodiment.
In addition, described first to the 3rd embodiment, can apply the present invention to the voice signal of multichannel although only relate to the voice signal of a sound channel.In this case, provide the sound quality adjustment device shown in Fig. 1,4 or 6 according to each sound channel.In addition, not needing that all sound channels are carried out sound quality regulates; Can carry out it in the sound channel at least one.For example, (L (promptly applying the present invention to comprise left front sound channel, a left side) right front channels (R (i.e. the right side) ch ch)), center channel (Cch), (SL (promptly for left back sound channel, a left side around) ch), (SR (promptly for right back sound channel, right around) ch) and inferior woofer channel (LFE (promptly, under the situation of 5.1 sound channel surrounding systems low-frequency effect) ch), can in sound channel Lch, Rch and Cch, realize high sound quality adjustment effect, therefore, only need each the execution sound quality adjusting separately among these three sound channel Lch, Rch and the Cch.
Can carry out sound quality separately to each sound channel and regulate, and can use identical or public gain coefficient these sound channels.All sound channels are being used under the situation of public gain coefficient, the treble boosting circuit 4 of each sound quality adjustment device that provides with the corresponding relation with sound channel Lch, Rch and Cch can pass through the level detection parts, maximum level among the treble components of sound channel Lch, the Rch that detection is extracted by the HPF 2 of correspondence and three voice signals of Cch is so that read and the corresponding gain coefficient of maximum level from gain table.Therefore, to carry out under the situation of sound quality adjusting three sound channel Lch, Rch and Cch, although each that is necessary among three sound channel Lch, Rch and the Cch provides sound quality adjustment device, but can between the treble boosting circuit separately 4 of three sound channels, share identical level sensitive circuit and gain table, as a result, can significantly reduce the entire circuit size.
[the 4th embodiment]
Next, the fourth embodiment of the present invention will be described.Fig. 8 is the block diagram according to the sound quality adjustment device of fourth embodiment of the invention, wherein is similar to element among Fig. 1,4 or 6 to be same as Reference numeral representation class among Fig. 1,4 or 6.The 4th embodiment is configured to one group of sound quality adjustment device that is used for multichannel, that is, is used for sound quality adjustment device 12-L, 12-R and the 12-C of sound channel Lch, Rch and Cch.The 4th embodiment also comprises normalization treatment circuit 13, and it is used to regulate the volume of the voice signal of each sound channel Lch, Rch and Cch.Can with above-mentioned first to the 3rd embodiment in any one identical mode construct among sound quality adjustment device 12-L, 12-R and the 12-C each.
Gain table 16 interrelatedly is stored in the gain coefficient of input audio signal level and amplifier 14-L, 14-R, 14-C, 14-SL, 14-SR and 14-LFE wherein in advance.Read and the corresponding gain coefficient of maximum level that detects by level detection parts 15 from gain table 16, and provide it to amplifier 14-L, 14-R, 14-C, 14-SL, 14-SR and 14-LFE.Among amplifier 14-L, 14-R, 14C, 14-SL, 14-SR or the 14-LFE each multiply by the voice signal of corresponding sound channel Lch, Rch, Cch, SLch, SRch or LFEch from the gain coefficient of gain table 16 outputs, thus the voice signal of the sound channel Lch behind the output multiplication, Rch, Cch, SLch, SRch or LFEch.
Fig. 9 shows the example I/O characteristic of normalization treatment circuit 13, and wherein transverse axis is represented the incoming level that is detected by level detection parts 15, and the output level of longitudinal axis representative normalization treatment circuit 13.Here suppose the given expression maximum level among sound channel Lch, Rch, Cch, SLch, SRch and the LFEch, and Fig. 9 shows the I/O characteristic of this given sound channel.As shown in, when sound import has small volume, increase gain, increasing amplitude, and when sound import has big volume, reduce gain, to suppress the amplitude reinforcement.
As in the situation of bass bossting circuit 3 or treble boosting circuit 4, can prepare a plurality of different types of I/O characteristic MIN, MID and the MAX of normalization treatment circuit 13 in advance, and the user can select in MIN, MID and the MAX characteristic any one.In this case, gain table 16 comprises and the corresponding a plurality of tables of a plurality of different types of I/O characteristics.
Except the favourable benefit that is provided by first embodiment, the 4th embodiment can also provide following favourable benefit.As mentioned above, the 4th embodiment is characterised in that, the corresponding common gain factor of maximum level among use and the multi-channel sound signal is carried out dynamic range expansion/contraction to the voice signal of each sound channel.Therefore, when sound had small volume, the 4th embodiment can improve volume, be hidden in noise behind to prevent sound, and when sound had big volume, the 4th embodiment can reduce volume, made audience's ear discomfort to prevent sound.
When the audio frequency of reproduction of moving picture, music etc. at night, can reduce the audio reproduction volume usually, so that interference neighbors not.Yet, reproduce volume if reduce, when the voice signal that provides from audio frequency apparatus has small volume, often be difficult to hear the sound of reproduction.On the other hand, reproduce volume if improve, then when the voice signal that provides from audio frequency apparatus had big volume, it was often too loud to reproduce sound.Yet Pei Zhi the 4th embodiment can prevent not only that sound becomes in the time will reproducing volume and be made as low level and is difficult to hear in the above described manner, but also can prevent that sound becomes too loud in the time will reproducing volume and be made as high level.In addition, sometimes, for example because between TV program and the commercial advertisement or the sound volume difference between the sound source, the user must adjust volume continually.The 4th embodiment can reduce the sound volume difference of not expecting that the difference owing to audio-source etc. causes, thereby eliminates the needs that user's frequent volume is adjusted.
Above the 4th embodiment is described as each predetermined channel is used common gain factor.In possibility, provide the level detection parts separately to each sound channel, and the gain coefficient specific to each sound channel can be offered amplifier 14-L, 14-R, 14-C, 14-SL, 14-SR or 14-LFE.In another possibility, sound channel is divided into a plurality of groups, and provides the level detection parts, and can use public gain coefficient each group to each group.For example, sound channel can be divided into the group of sound channel Lch and Rch and the group of all the other sound channels, perhaps be divided into the group of sound channel Lch and Rch, the only group of sound channel Cch and the group of all the other sound channels.
[the 5th embodiment]
Figure 10 is the block diagram that illustrates according to the operated by rotary motion of the sound quality adjustment device of fifth embodiment of the invention.The 5th embodiment comprises: LPF 110, as extraction element or parts; HPF 120, also as extracting parts; Attenuation processing parts 130 and 140; Coefficient calculations parts 150 and 160; Bass reinforcing member 170, as the Filtering Processing parts, and high pitch reinforcing member 180, also as the Filtering Processing parts.
With the behavior of describing according to the quality regulator of the 5th embodiment.Take the LPF 110 of IIR (infinite impulse response) filter form to be extracted in frequency and be lower than for example voice signal of the bass range of hundreds of hertz from input audio signal.Also take the HPF 120 of iir filter form to be extracted in frequency and be higher than for example voice signal of the high pitch scope of several KHz from input audio signal.
As shown in figure 11, when having imported impact sound signal IN, attenuation processing parts 130 attenuates sound signal little by little in predetermined release time, and do not make the level of output signal OUT follow voice signal IN, wherein the level of this voice signal IN reduces after presenting maximum apace.In the 5th embodiment, carry out attenuation processing, wherein attenuation rate non-linearly increases according to the process of time.Therefore, after in the bass range of extracting by LPF 110, having taken place to be similar to the variation of impact, suppress the variation of output level immediately, then, when through preset time, increase the decay of output level, thereby the 5th embodiment can give the sense of hearing of audience's nature.
In order to realize such attenuation processing, with predetermined time interval the voice signal that is input to attenuation processing parts 130 is sampled, and between the sample value of current time and the output valve in last sampling time, compare, so that the higher value of two sample values being compared is chosen as the output valve of current time.Therefore, when the input audio signal level increases, select up-to-date sample value unchangeably, but, when the input audio signal level reduces, select the output valve in last sampling time, in this case, the value in the last sampling time of decaying is set to the output valve of current time with it.In this case, as mentioned above, attenuation rate increases along with the process of time, and the level ratio of next sampling in, use the output valve of this output valve as the last sampling time.To dispose another attenuation processing parts 140 with attenuation processing parts 130 similar modes.
The bass bossting circuit 170 of taking slant filtering device (shelving filter) form is carried out Filtering Processing, so that increase/reduce the level of the bass range of the input audio signal that is lower than preset frequency according to the filter factor from 150 outputs of coefficient calculations parts.Similarly, the treble boosting circuit 180 of also taking slant filtering device form is carried out Filtering Processing, so that increase/reduce the level of the high pitch scope of the input audio signal that is higher than preset frequency according to the filter factor from 160 outputs of coefficient calculations parts.
Figure 12 A and 12B are the figure that the example frequency characteristic of the bass bossting circuit 170 among the 5th embodiment is shown.More particularly, Figure 12 A does not show not the frequency characteristic of the voice signal of being handled by bass bossting circuit 170, and Figure 12 B shows the frequency characteristic of the voice signal of being handled by bass bossting circuit 170.In each of Figure 12 A and 12B, transverse axis is represented frequency, and longitudinal axis representative voice signal level.Numerical value 0dB--90dB represents the input audio signal level.As finding out, by the Filtering Processing of bass bossting circuit 170, when sound has small volume from Figure 12 B, increase the enhancing amount of bass range, with the big bottom component, but when sound has big volume, reduce the enhancing amount of bass range, to suppress increasing the weight of to bass range.Based on disposing treble boosting circuit 180, to increase/to reduce the high pitch scope with bass bossting circuit 170 similar principles.
As mentioned above, because strengthen the bass component of extracting from input audio signal by bass bossting circuit 170, even the 5th embodiment allows the volume of the bass range in the whole volume other near predetermined volume, thereby when sound source has a spot of bass component, also can give sound with " strength ".Similarly, because strengthen the treble components of extracting from input audio signal, so even when sound source has a spot of treble components, present embodiment also can make sound " become soft " by treble boosting circuit 180.
In addition, compare at known sound quality adjustment device traditionally with shown in Figure 13, the feed-forward arrangement of the filter factor of real time altering bass and treble boosting circuit 170 and 180 because the 5th embodiment is used for according to the level of bass that is extracted by LPF 110 and HPF 120 and treble components, rather than adopt the feedback of the level be subjected to the voice signal that sound quality regulates, so can responding sound signal level apace, it changes.As a result, even when having the quick increase of input audio signal level, present embodiment also can suppress increasing the weight of of bass and treble components rapidly or strengthen, thereby prevents to generate unnecessary slicing sound.
In addition, described the 5th embodiment, can be applied to the voice signal of multichannel although only relate to the voice signal of a sound channel.In this case, provide sound quality adjustment device shown in Figure 10 according to each sound channel.In addition, not needing that all sound channels are carried out sound quality regulates; Can carry out it in the sound channel at least one.For example, in 5.1 sound channel surrounding systems, only need three sound channels: left front sound channel (Lch); Right front channels (Rch); And each execution sound quality adjusting separately in the center channel (Cch).
Can carry out sound quality separately to each sound channel and regulate, in this case, these sound channels be used identical or public gain coefficient.These sound channels are being used under the situation of common gain factor, the coefficient calculations parts 150 of bass bossting circuit 170 that are used for each sound quality adjustment device of sound channel Lch, Rch and Cch can calculate with by the corresponding coefficient of maximum level among the bass component of three voice signals of sound channel Lch, the Rch of corresponding LPF 110 extractions and Cch.Therefore, to carry out under the situation of sound quality adjusting three sound channel Lch, Rch and Cch, although must provide sound quality adjustment device among sound channel Lch, Rch and the Cch each, but can be (promptly at each, three) share identical coefficient calculations parts between the bass bossting circuit 170; By this way, can reduce the entire circuit size.
Pei Zhi the present invention in the above described manner goes for audio frequency apparatus and television receiver.
Claims (7)
1. sound quality adjustment device, it comprises in the voice signal of a plurality of sound channels at least one:
Filter circuit, it extracts the voice signal of predetermined frequency band from input audio signal;
Intensifier circuit, it carries out dynamic range expansion/contraction according to the incoming level of described voice signal to the voice signal that is extracted by described filter circuit; And
Adder, it is with described input audio signal and added together by the voice signal of described intensifier circuit output.
2. sound quality adjustment device as claimed in claim 1 also comprises subtracter at this at least one voice signal, and it deducts the voice signal that is extracted by described filter circuit from described input audio signal,
Input audio signal after wherein said adder will deduct and added together by the voice signal of described intensifier circuit output.
3. sound quality adjustment device as claimed in claim 1, the attenuation processing circuit that provides between described filter circuit and the described intensifier circuit also is provided at this at least one voice signal, described attenuation processing circuit is according to the reduction of the level of the voice signal that is extracted by described filter circuit, the output level of little by little decaying.
4. sound quality adjustment device as claimed in claim 1, also comprise the normalization treatment circuit, the corresponding common gain factor of maximum level of the voice signal of its use and described a plurality of sound channels is carried out dynamic range expansion/contraction to the voice signal of each sound channel.
5. sound quality adjustment device as claimed in claim 1, also comprise the normalization treatment circuit, the maximum level of the voice signal of each predetermined group that its voice signal that detects described a plurality of sound channels is divided, and the corresponding common gain factor of maximum level of use and this group is carried out dynamic range expansion/contraction to the voice signal of each group.
6. sound quality adjustment device, it comprises in the voice signal of a plurality of sound channels at least one:
Extract parts, it extracts the voice signal of predetermined frequency band from input audio signal;
The coefficient calculations parts, it is based on the level of the voice signal that is extracted by described extraction parts, calculating filter coefficient; And
The filter process parts, it carries out filter process according to by the filter coefficient of described coefficient calculations component computes, is used to increase/reduce the sound signal level of the predetermined frequency band of described input audio signal.
7. sound quality adjustment device as claimed in claim 6, attenuation processing parts that provide between described extraction parts and the described filter process parts also are provided at this at least one voice signal for it, described attenuation processing parts are according to the reduction of the level of the voice signal that is extracted by described extraction parts, the output level of little by little decaying.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP166228/05 | 2005-06-06 | ||
| JP2005166222A JP4161983B2 (en) | 2005-06-06 | 2005-06-06 | Sound quality adjustment device |
| JP166222/05 | 2005-06-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1877988A true CN1877988A (en) | 2006-12-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610091610 Pending CN1877988A (en) | 2005-06-06 | 2006-06-06 | Sound quality adjustment device |
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| Country | Link |
|---|---|
| JP (1) | JP4161983B2 (en) |
| CN (1) | CN1877988A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2012094827A1 (en) * | 2011-01-14 | 2012-07-19 | Huawei Technologies Co., Ltd. | A method and an apparatus for voice quality enhancement |
| CN102007777B (en) * | 2008-04-09 | 2014-08-20 | 皇家飞利浦电子股份有限公司 | Generation of a drive signal for sound transducer |
| CN105491478A (en) * | 2015-12-30 | 2016-04-13 | 东莞爱乐电子科技有限公司 | Subwoofer with volume being controlled by television sound envelope line |
| CN106658299A (en) * | 2017-02-21 | 2017-05-10 | 广东欧珀移动通信有限公司 | Audio signal processing circuit and terminal device |
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| US8045731B2 (en) | 2005-06-06 | 2011-10-25 | Yamaha Corporation | Sound quality adjustment device |
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| JP4803193B2 (en) * | 2008-02-21 | 2011-10-26 | 三菱電機株式会社 | Audio signal gain control apparatus and gain control method |
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| JP5957964B2 (en) * | 2012-03-02 | 2016-07-27 | ヤマハ株式会社 | Sound processing apparatus and sound processing method |
| JP6205758B2 (en) * | 2013-03-08 | 2017-10-04 | オンキヨー株式会社 | SOUND DEVICE, SOUND DEVICE CONTROL METHOD AND PROGRAM |
| JP6603725B2 (en) * | 2015-09-30 | 2019-11-06 | パイオニア株式会社 | Audio signal generation apparatus, audio signal generation method, and program |
| US10149053B2 (en) * | 2016-08-05 | 2018-12-04 | Onkyo Corporation | Signal processing device, signal processing method, and speaker device |
-
2005
- 2005-06-06 JP JP2005166222A patent/JP4161983B2/en not_active Expired - Fee Related
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2006
- 2006-06-06 CN CN 200610091610 patent/CN1877988A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102007777B (en) * | 2008-04-09 | 2014-08-20 | 皇家飞利浦电子股份有限公司 | Generation of a drive signal for sound transducer |
| US8934643B2 (en) | 2008-04-09 | 2015-01-13 | Koninklijke Philips N.V. | Generation of a drive signal for sound transducer |
| WO2012094827A1 (en) * | 2011-01-14 | 2012-07-19 | Huawei Technologies Co., Ltd. | A method and an apparatus for voice quality enhancement |
| US9299359B2 (en) | 2011-01-14 | 2016-03-29 | Huawei Technologies Co., Ltd. | Method and an apparatus for voice quality enhancement (VQE) for detection of VQE in a receiving signal using a guassian mixture model |
| CN105491478A (en) * | 2015-12-30 | 2016-04-13 | 东莞爱乐电子科技有限公司 | Subwoofer with volume being controlled by television sound envelope line |
| CN106658299A (en) * | 2017-02-21 | 2017-05-10 | 广东欧珀移动通信有限公司 | Audio signal processing circuit and terminal device |
| CN106658299B (en) * | 2017-02-21 | 2020-01-10 | Oppo广东移动通信有限公司 | Audio processing circuit and terminal equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2006340328A (en) | 2006-12-14 |
| JP4161983B2 (en) | 2008-10-08 |
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