KR20160120081A - Amplifier for crack sound of coffee - Google Patents

Amplifier for crack sound of coffee Download PDF

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Publication number
KR20160120081A
KR20160120081A KR1020150049144A KR20150049144A KR20160120081A KR 20160120081 A KR20160120081 A KR 20160120081A KR 1020150049144 A KR1020150049144 A KR 1020150049144A KR 20150049144 A KR20150049144 A KR 20150049144A KR 20160120081 A KR20160120081 A KR 20160120081A
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KR
South Korea
Prior art keywords
coffee
sound
unit
amplifying
roaster
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KR1020150049144A
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Korean (ko)
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정순원
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정순원
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Priority to KR1020150049144A priority Critical patent/KR20160120081A/en
Publication of KR20160120081A publication Critical patent/KR20160120081A/en

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/217—Class D power amplifiers; Switching amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

More particularly, the present invention relates to a coffee cracking acoustic amplifying apparatus for collecting sound emitted from a coffee roaster in a roasting process of coffee through a sound receiving unit and amplifying the collected sound through a high pass filter unit and an amplifier , It is possible to accurately listen to the cracked sound that appears during the coffee roasting process, and it is possible to collect only the sound generated from the coffee roaster by installing the funnel-type sound collector and the unidirectional microphone, It is possible to actively remove mechanical noises from the sound emitted from the coffee roaster and to prevent howling due to the feedback between the sound receiver and the speaker by providing the anti-feedback unit.

Description

Amplifier for crack sound of coffee

The present invention relates to a method and apparatus for collecting sound emitted from a coffee roaster during a coffee roasting process through a sound receiving unit and amplifying the collected sound through a high-pass filter unit and an amplifier, By installing a funnel-shaped sound collector and a unidirectional microphone, it is possible to only pick up the sound generated in the coffee roaster, and by additionally installing a low-pass filter and a signal inversion, The present invention relates to a coffee crack sound amplifying apparatus capable of actively removing mechanical noise among sounds and preventing howling due to feedback between a sound receiving unit and a speaker by providing a howling preventing unit.

Coffee grown in the coffee region is processed and sold in the form of green beans. These roots are roasted in a coffee roaster and become roasted coffee beans. After grinding coffee beans, coffee beverages are made in various ways.

Coffee roasting causes complicated physical and chemical changes depending on the heating time, and the final coffee taste varies greatly depending on how much roasting the coffee is in the same medium. Generally, when roasting for a short time, the color of the bean becomes lighter brownish and stronger, and the more the roasting is done, the darker the color of the bean, the weaker the acidity, and the stronger the body can be obtained.

The amount of roasting is determined by the decision of the roaster to roast the coffee entirely. The roaster is used to determine the degree of roasting from the change of shape, color, . Among these changes, one of the most important information used to understand the degree of roasting of coffee is the change of sound.

As the roasting of the coffee proceeds, the color of the coffee gradually becomes darker due to the browning reaction, and when it reaches at any moment, the coffee cracks due to the water swelling inside the coffee, and the primary cracking sound starts to be heard. As the roasting progresses, the primary cracks reach the peak of the primary crack, which appears as a continuous multiple, and then the primary cracks gradually decrease. After that, the coffee breaks through the pauses where the first cracks can not be heard, the second crack starts to sound, and as the coffee cracks over the second crack, the coffee starts to carbonize and gradually turns black.

In other words, the coffee roaster can determine how much roasted coffee is currently routed through the cracking sound that occurs during the roasting process, and at what point determines the roasting and discharge of the coffee.

However, there is a problem that the crack sound, which plays an important role in determining the degree of roasting, varies depending on the type of coffee and the processing method. Generally speaking, hard cracks produced in high mountain areas are very noticeable due to the large cracks, whereas cracks are very small or almost inaccessible for roasted green beans produced in low areas such as Brazil. There is a great difficulty in doing this.

In addition, when several roaster units are operated simultaneously in one place, it is difficult to distinguish the cracking sound due to the operation noise of the other roaster unit.

Also, when the roaster is weak in hearing or the roaster is elongated, it is difficult to distinguish the cracking sound.

Therefore, there is a desperate need for the development of a coffee cracking acoustic amplification device which can accurately grasp the cracking sound of coffee regardless of the type of coffee or processing method, and accurately distinguish the cracking sound without being influenced by the ambient noise or the auditory ability of the roaster .

Korean Patent Publication No. 10-2009-0078766 (2009.7.20)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a coffee roaster and a coffee roaster that are capable of collecting sound emitted from a coffee roaster during a roasting process of coffee through a sound receiving unit, amplifying the collected sound through a high- And a coffee crack sound amplification device capable of accurately listening to a crack sound that appears as coffee swells during the coffee roasting process.

Another object of the present invention is to provide a coffee crack sound amplifying apparatus capable of collecting only sound generated in a coffee roaster by providing a funnel-shaped sound collector and a unidirectional microphone.

It is another object of the present invention to provide a coffee crack acoustic amplifier capable of actively removing mechanical noise among sounds emitted from a coffee roaster by additionally providing a low pass filter and a signal inversion unit.

Another object of the present invention is to provide a coffee crack sound amplifying apparatus which can prevent howling due to feedback between a receiving unit and a speaker by providing a hauling prevention unit.

According to another aspect of the present invention, there is provided a coffee cracking acoustic amplifier including: a receiver for collecting sound emitted from a coffee roaster; A first amplifying unit for amplifying the fine acoustic signals collected from the sound receiving unit; A high pass filter unit for passing only a high frequency part of the acoustic signal amplified by the first amplifying unit; A second amplifying unit amplifying an acoustic signal having passed through the high-pass filter unit; And a speaker for reproducing the acoustic signal amplified by the second amplification unit, and the second amplification unit includes an amplification gain control unit for controlling the amplification gain according to the user's need.

In the present invention, the sound receiving unit may include a funnel-shaped sound collecting unit closely attached to the coffee roaster in order to block external noise and to collect only sounds generated in the coffee roaster unit; And a microphone attached to one opening of the collector for converting the sound collected by the collector into an electrical acoustic signal.

In the present invention, the sound receiving unit is characterized by using a unidirectional microphone to block external noise and to collect only sounds generated in the coffee roaster.

In the present invention, the high-pass filter unit may include a frequency controller capable of controlling a high-pass frequency.

In the present invention, in order to actively remove mechanical noise among sounds emitted from the coffee roaster, a low-pass filter unit passes only a low-frequency part of the output signal of the first amplifying unit; And a signal inversion unit for inverting a signal that has passed through the low pass filter unit and inputting the output of the signal inversion unit to the second amplification unit.

In the present invention, a hauling prevention unit is further provided to remove a signal of a specific frequency band in which howling occurs in order to prevent howling due to feedback between the sound receiving unit and the speaker.

As described above, the coffee crack sound amplifying apparatus of the present invention has the following effects.

First, the present invention collects the sound emitted from the coffee roaster during the roasting process of the coffee, and amplifies the collected sound through the high-pass filter and the amplifier. Thus, the crack sound that appears as the coffee expands during the coffee roasting process You can hear it exactly.

Second, the present invention can collect only sound generated in a coffee roaster by installing a funnel-shaped sound collector and a unidirectional microphone.

Third, the present invention can additionally provide a low-pass filter and a signal inverting unit to actively remove mechanical noise among sounds emitted from the coffee roaster.

Fourth, the present invention can prevent howling due to feedback between the receiving portion and the speaker by providing the howling preventing portion.

1 is a block diagram for explaining a coffee crack sound amplifying apparatus according to an embodiment of the present invention;
2 is a view showing the structure of a sound receiving unit in a coffee crack acoustic amplifying apparatus according to an embodiment of the present invention;
3 is a configuration diagram of a coffee crack sound amplifying apparatus according to an embodiment of the present invention,
4 is a block diagram of a coffee crack acoustic amplifying apparatus according to an embodiment of the present invention, in which a low-pass filter unit and a signal inversion unit are added;
5 is a configuration diagram of a coffee crack sound amplifying apparatus according to an embodiment of the present invention,

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, when it is determined that a detailed description of related art or configuration may unnecessarily obscure the gist of the present invention, The description below will be omitted. The following terms are defined in consideration of the functions of the present invention, and this may vary depending on the intention or custom of the user, operator, and the like. It should be based on the contents throughout the specification.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a coffee crack sound amplifying apparatus according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram for explaining a coffee cracking acoustic amplifying apparatus according to an embodiment of the present invention, FIG. 2 is a diagram illustrating a structure of a sound receiving unit in a coffee cracking acoustic amplifying apparatus according to an embodiment of the present invention, FIG. 3 is a configuration diagram of a coffee crack acoustic amplifying apparatus according to an embodiment of the present invention, to which a frequency control unit is added. FIG. 4 is a block diagram of a coffee crack acoustic amplifying apparatus according to an embodiment of the present invention, FIG. 5 is a configuration diagram of a coffee cracking acoustic amplifying device according to an embodiment of the present invention, to which a hauling prevention part is added.

1, a coffee cracking acoustic amplification apparatus according to an embodiment of the present invention includes a sound receiving unit 10, a first amplifying unit 20, a high-pass filtering unit 30, a second amplifying unit 40 An amplification gain control section 41, a speaker 50, and the like.

As shown in FIG. 1, the coffee crack acoustic amplifying apparatus of the present invention comprises: a sound receiving section 10 for collecting sound emitted from a coffee roaster; A first amplifying unit 20 for amplifying the fine acoustic signals collected from the sound receiving unit; A high pass filter (30) for passing only a high frequency part of the acoustic signal amplified by the first amplifying part; A second amplifying unit 40 for amplifying the acoustic signal having passed through the high-pass filter; And a speaker 50 for reproducing an acoustic signal amplified by the second amplifying unit. The second amplifying unit includes an amplifying gain control unit 41 for controlling an amplifying gain according to the user's need.

As shown in Fig. 2, the sound receiver 10 includes a funnel-shaped sound collecting part 11 which is in close contact with a coffee roaster to block external noises and to collect only sounds generated in the coffee roaster; And a microphone (12) attached to one opening of the collector and converting the sound collected by the collector into an electrical acoustic signal.

The sound receiving portion 10 of FIG. 1 may use a unidirectional microphone to block external noise and to collect only sounds generated by the coffee roaster.

As shown in FIG. 3, the high-pass filter unit 30 further includes a frequency control unit 31 capable of controlling a high-pass frequency.

As shown in FIG. 4, in order to actively remove mechanical noise among sounds emitted from the coffee roaster, a low-pass filter 60 for passing only the low-frequency part of the output signal of the first amplifying part 20; And a signal inverting unit 70 for inverting a signal that has passed through the low pass filter unit 60 so as to input an output of the signal inverting unit 70 to the second amplifying unit 40 .

As shown in FIG. 5, in order to prevent howling due to feedback between the sound receiver 10 and the speaker 50, a hauling prevention unit 80 for removing a signal of a specific frequency band in which howling occurs .

The function of each technical means constituting the coffee crack sound amplifying apparatus of the present invention will be described as follows.

In Fig. 1, the sound receiver 10 collects sound emitted from the coffee roaster. As described above, as the roasting of coffee progresses, the color of the coffee gradually becomes darker due to the browning reaction. When the coffee reaches a certain moment, the coffee cracks due to the swelling of the inside of the coffee, and the first crack sound starts to be heard. As the roasting progresses, the primary cracks reach the peak of the primary crack, which appears as a continuous multiple, and then the primary cracks gradually decrease. After that, the coffee breaks through the pauses where the first cracks can not be heard, the second crack starts to sound, and as the coffee cracks over the second crack, the coffee starts to carbonize and gradually turns black. Table 1 shows the cracking and distribution diagrams and corresponding coffee color changes as coffee roasting progresses.

crack
Sound Crack migration Primary crack Dormant Secondary crack First half Vertex Late First half Vertex Late Distribution chart light Cinnamon Medium Hi city Full City French color Light brown Brown ------- dark brown brown Dark Brown ------ Black

The operation sound of the roaster machine and the crack sound of coffee are collected through the sound receiving unit 10, and the collected micro acoustic signals are first amplified by the first amplifying unit 20.

The acoustic signals collected and amplified include both the roaster operation sound and the coffee crack sound. Normally, the operation sound of the roaster machine contains a lot of low frequencies, and the crack sound of the coffee contains a lot of high frequencies. Therefore, when the first amplified sound signal passes through the high pass filter unit 30, the operation sound of the roaster is attenuated and the crack sound of the coffee is preserved.

The coffee crack sound that has passed through the high-pass filter unit 30 is secondarily amplified by the second amplifying unit 40 and can be heard through the speaker 50 at a high volume. The user can control the amplification gain through the amplification gain control unit 41 as needed.

If the sound receiving unit 10 is disposed far away from the coffee roaster, ambient noise may be introduced in addition to the sound from the roaster. Therefore, the configuration of the sound receiving unit is to block external noise and collect only sounds generated in the coffee roaster 2, there is a funnel-shaped collecting part 11 which is in close contact with a coffee roaster and a microphone 12 which is attached to one opening of the collecting part and converts the sound collected by the collecting part into an electric acoustic signal desirable. If the large opening on the left side of the collector 11 is in close contact with the coffee roaster, the external noise is cut off and only the sound from the roaster can be collected.

Further, the microphone 12 used in the sound receiving section 10 is capable of collecting sound from the roster more accurately by using a unidirectional microphone. Since the unidirectional microphone is particularly sensitive to the sound coming from the front of the microphone, the unidirectional microphone can appropriately block the external noise passing through the sound collector 11. [

The high-pass filter unit 30 serves to attenuate the operation sound of the roaster machine and preserve the crack sound of the coffee, and the frequency range of the operation sound differs for each roaster machine. Therefore, as shown in FIG. 3, if the frequency control unit 31 is added to the high pass filter unit 30 to control the high pass frequency according to the characteristics of the roaster unit, the operation sound of the roaster unit can be effectively blocked.

As shown in FIG. 4, a low-pass filter 60 and a low-pass filter 60, which pass only a low-frequency part of the output signal of the first amplifier 20, And a signal inverting unit 70 for inverting a signal having passed through the signal amplifying unit 70. The signal amplifying unit 70 may further include an active noise canceling unit for inputting the output of the signal inverting unit 70 to the second amplifying unit 40. [

Since the operation sound of the roaster includes a lot of low frequencies, the signal passing through the low pass filter 60 is mostly composed of the roasting sound of the roaster. When a signal having passed through the low-pass filter unit 60 is input to the second amplifying unit via the signal inverting unit 70 and then output to the speaker, the original operation sound of the roaster unit, Are combined and canceled out in opposite phases. Accordingly, the user can hear clearly only the coffee crack sound except for the operation sound of the roaster machine.

If the microphone and the speaker are disposed closely to each other in the above-described configuration, howling may occur due to feedback between the sound receiver 10 and the speaker 50 at a specific frequency. In order to prevent such howling, FIG. 5 shows that a hauling prevention unit 80 for removing a signal of a specific frequency band in which howling occurs is additionally provided. 5, the hauling prevention unit is connected to the rear end of the first amplification unit 20. However, the hauling prevention unit may include a sound receiving unit 10, The speaker 50 can be placed in various positions on the signal path.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. It is not.

As described above, the coffee crack sound amplifying apparatus of the present invention can be applied to the field of roasting coffee.

10: a receiving part 11: a collecting part
12: microphone 20: first amplifier section
30: high-pass filter unit 31:
40: second amplification unit 41: amplification gain control unit
50: speaker 60: low pass filter section
70: signal inversion section 80:

Claims (6)

CLAIMS 1. A coffee crack acoustic amplifying device comprising:
A receiving portion for collecting sound emitted from the coffee roaster;
A first amplifying unit for amplifying the fine acoustic signals collected from the sound receiving unit;
A high pass filter unit for passing only a high frequency part of the acoustic signal amplified by the first amplifying unit;
A second amplifying unit amplifying an acoustic signal having passed through the high-pass filter unit;
And a speaker for reproducing the acoustic signal amplified by the second amplifying unit,
Wherein the second amplification unit includes an amplification gain control unit that can control an amplification gain according to a user's need. The method according to claim 1,
In order to block external noise and to collect only the sound generated in the coffee roaster,
A funnel-shaped collecting portion closely adhered to the coffee roaster;
And a microcavity which is attached to one opening of the collector and converts the sound collected by the collector to an electrical acoustic signal. 3. The method of claim 2,
Characterized in that the microphone uses a unidirectional microphone to block external noise and to collect only the sound generated in the coffee roaster. The method according to claim 1,
Wherein the high-pass filter unit includes a frequency control unit capable of controlling a high-pass frequency, The method according to claim 1,
In order to actively remove the mechanical noise among the sounds emitted from the coffee roaster,
A low pass filter unit for passing only the low frequency part of the output signal of the first amplifying unit;
And a signal inverting section for inverting a signal passed through the low-pass filter section,
And an active noise canceling unit for inputting the output of the signal inverting unit to the second amplifying unit. 4. The method according to any one of claims 1 to 3,
In order to prevent howling due to feedback between the receiving part and the speaker,
And a hauling prevention unit for removing a signal of a specific frequency band in which howling occurs,
KR1020150049144A 2015-04-07 2015-04-07 Amplifier for crack sound of coffee KR20160120081A (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090078766A (en) 2009-06-16 2009-07-20 오영근 Method for roasting coffee beans

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090078766A (en) 2009-06-16 2009-07-20 오영근 Method for roasting coffee beans

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