I have one question #1
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xaxis = frequency
yanxis = frequency's value (=note)
(int)frequency = 8192 Variable is maximum value of Frequency mic input
usually piano's note range is between 27 and 4096 Hz, but FFT need double size (find google, imaginary number + real sound size)
(int)blockSize = 4096 Variable is xaxis
blockSize's element of array are result of process
if the phone is nearby the piano, 60(yanxis) is threshold
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Subject: [Const4nt0228/Android-FFT-Sound-Recognizer] I have one question (Issue #1)
It isn't issue.
I want to know xaxis and yaxis value meaming
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Thank you
…On Tue, Nov 15, 2022 at 8:03 AM sangsu.Park ***@***.***> wrote:
xaxis = frequency
yanxis = frequency's value (=note)
(int)frequency = 8192 Variable is maximum value of Frequency mic input
usually piano's note range is between 27 and 4096 Hz, but FFT need double
size (find google, imaginary number + real sound size)
(int)blockSize = 4096 Variable is xaxis
blockSize's element of array are result of process
if the phone is nearby the piano, 60(yanxis) is threshold
-----Original Message-----
From: ***@***.***>
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Cc: ***@***.***>;
Sent: 2022-11-09 (수) 18:51:27 (GMT+09:00)
Subject: [Const4nt0228/Android-FFT-Sound-Recognizer] I have one question
(Issue #1)
It isn't issue.
I want to know xaxis and yaxis value meaming
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APPLE Developer have FFT API (check this : https://developer.apple.com/documentation/accelerate/fast_fourier_transforms) |
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im really sorry but ,, im not a iOS dev, so i don't have any iOS project. |
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to get Note, Should I confirm if "i" is in above frequencies, If not, toTransform[0][i] is in above frequencies? if(toTransform[0][111]>99999){ ........ correct? and, Do you have skype? |
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안녕하세요
사진에 나온 표(Table)은 음계(scale)에 해당하는 주파수(frequency)를 나타내는 표입니다.
'toTransform[0][i]' array에서 i는 주파수를 의미합니다
toTransform[0][261] 일 경우는 261Hz를 의미합니다. 하지만 스마트폰(Galaxy S10) 마이크를 이용했을 때 정확히 261이 아닌 259, 260, 261 hz에서 value가 변동했으므로 임의로 추가했습니다.
이 문제는 스마트폰의 마이크 환경마다 다르게 나타날 것이므로 실제로 여러번의 테스트를 해 봐야 할 것으로 보입니다.
toTransform[0][261] 의 value는 해당 주파수의 강도(amplitude)이며 이는 소리의 크기를 의미하기도 합니다.
'55 , 15, 30, 20... means frequencies' value' 가 맞습니다
숫자가 각각 다른 이유는 실제 테스트 결과 어떤 note는 55이상에서 검출되고 또 어떤 note는 30 이상에서 검출되기 때문에
각각 여러번의 테스트를 통해 일치하는 부분에 직접 matched value를 입력했습니다.
+ + )
주파수에 대해 조금 더 설명해보자면
현재 코드에서는 0~4096 범위의 주파수만 측정하도록 되어있습니다.
'int blockSize =4096'이 주파수의 범위입니다.
'int frequency'가 8192 인 이유는 FFT를 수행할 때 'blockSize' 크기와 같은 허수(Imaginary number)를 배열에 합치기 때문입니다.
정확한 코드 표기는
int frequency = blockSize*2 가 맞습니다
RealDoubleFFT의 경우 별도의 계산 과정 없이 라이브러리에 넘겨주면 되며
JTransform 같은 경우는 허수(Imagenary Number)와 실수(Real Number)를 합쳐주는 별도의 계산을 수행해야 합니다.
…-----Original Message-----
From: ***@***.***>
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Cc: ***@***.***>; ***@***.***>;
Sent: 2023-05-26 (금) 16:45:07 (GMT+09:00)
Subject: Re: [Const4nt0228/Android-FFT-Sound-Recognizer] I have one question (Issue #1)
to get Note, Should I confirm if "i" is in above frequencies, If not, toTransform[0][i] is in above frequencies?
if(toTransform[0][111]>99999){
} else if(toTransform[0][259]>55 ||toTransform[0][260]>55 || toTransform[0][261]>55 ){ scale2 = "C4"; //도 } else if(toTransform[0][293]>15 || toTransform[0][292]>30 || toTransform[0][294]>20 || toTransform[0][295]>30 || toTransform[0][296]>30 ){ scale2 = "D4"; //레 }
........
this code means "i" is the frequency to get Note.
55 , 15, 30, 20... means frequencies' value.
correct?
and, Do you have skype?
live:.cid.577a933b152c41f9
it is my skype id.
I want to learn FFT in detail from you.
Please help me
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It isn't issue.
I want to know xaxis and yaxis value meaming
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