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@ -20,72 +20,68 @@ function frameF = filterbank(frameT, frameType, winType) |
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persistent kaiserWindowLong kaiserWindowShort sinWindowLong sinWindowShort; |
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if isempty(kaiserWindowLong) || isempty(kaiserWindowShort) || ... |
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isempty(sinWindowLong) || isempty(sinWindowShort) |
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kaiserLong = kaiser(1024, 6*pi); |
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kaiserLong = kaiser(1025, 6*pi); |
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kaiserSumLong = sum(kaiserLong); |
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kaiserShort = kaiser(128, 4*pi); |
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kaiserShort = kaiser(129, 4*pi); |
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kaiserSumShort = sum(kaiserShort); |
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for n = 1:1024 |
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kaiserWindowLong(n) = sqrt(sum(kaiserLong(1:n))/kaiserSumLong); |
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kaiserWindowLong(1024 + n) = sqrt(sum(kaiserLong(1:end-n+1))/kaiserSumLong); |
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kaiserWindowLong(1:1024) = movsum(kaiserLong(1:1024), [1024 0]); |
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kaiserWindowLong(1025:2048) = movsum(flipud(kaiserLong(1:1024)), [0 1024]); |
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kaiserWindowLong = sqrt(kaiserWindowLong ./ kaiserSumLong); |
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sinWindowLong(n) = sin(pi*(n + 0.5)/2048); |
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sinWindowLong(1024 + n) = sin(pi*(1024 + n + 0.5)/2048); |
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sinWindowLong = sin(pi * ((0:2047) + 0.5) / 2048); |
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end |
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for n = 1:128 |
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kaiserWindowShort(n) = sqrt(sum(kaiserShort(1:n))/kaiserSumShort); |
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kaiserWindowShort(128 + n) = sqrt(sum(kaiserShort(1:end-n+1))/kaiserSumShort); |
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kaiserWindowShort(1:128) = movsum(kaiserShort(1:128), [128 0]); |
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kaiserWindowShort(129:256) = movsum(flipud(kaiserShort(1:128)), [0 128]); |
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kaiserWindowShort = sqrt(kaiserWindowShort ./ kaiserSumShort); |
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sinWindowShort(n) = sin(pi*(n + 0.5)/256); |
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sinWindowShort(128 + n) = sin(pi*(128 + n + 0.5)/256); |
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end |
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sinWindowShort = sin(pi * ((0:255) + 0.5) / 256); |
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end |
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% Initializes output array |
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frameF(1024, 2) = 0; |
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% Applies appropriate window to the frame |
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for channel=1:2 |
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if strcmp(frameType, 'OLS') |
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if strcmp(winType, 'KBD') |
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frameT(:, channel) = frameT(:, channel) .* kaiserWindowLong(:); |
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elseif strcmp(winType, 'SIN') |
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frameT(:, channel) = frameT(:, channel) .* sinWindowLong(:); |
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else |
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error('filterbank, l[20]: Unsupported window type input!') |
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end |
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if strcmp(frameType, 'OLS') |
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if strcmp(winType, 'KBD') |
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frameT = bsxfun(@times, frameT, kaiserWindowLong'); |
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elseif strcmp(winType, 'SIN') |
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frameT = bsxfun(@times, frameT, sinWindowLong'); |
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else |
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error('filterbank, l[20]: Unsupported window type input!') |
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end |
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frameF(:, channel) = mdct4(frameT(:, channel)); |
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elseif strcmp(frameType, 'LSS') |
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if strcmp(winType, 'KBD') |
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frameT(1:1024, channel) = frameT(1:1024, channel) .* kaiserWindowLong(1:1024)'; |
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frameT(1473:1600, channel) = frameT(1473:1600, channel) .* kaiserWindowShort(129:end)'; |
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frameT(1601:end, channel) = 0; |
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elseif strcmp(winType, 'SIN') |
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frameT(1:1024, channel) = frameT(1:1024, channel) .* sinWindowLong(1:1024)'; |
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frameT(1473:1600, channel) = frameT(1473:1600, channel) .* sinWindowShort(129:end)'; |
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frameT(1601:end, channel) = 0; |
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else |
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error('filterbank, l[20]: Unsupported window type input!') |
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end |
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frameF = mdct4(frameT); |
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elseif strcmp(frameType, 'LSS') |
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if strcmp(winType, 'KBD') |
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frameT(1:1024, :) = bsxfun(@times, frameT(1:1024, :), kaiserWindowLong(1:1024)'); |
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frameT(1473:1600, :) = bsxfun(@times, frameT(1473:1600, :), kaiserWindowShort(129:end)'); |
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frameT(1601:end, :) = 0; |
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elseif strcmp(winType, 'SIN') |
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frameT(1:1024, :) = bsxfun(@times, frameT(1:1024, :), sinWindowLong(1:1024)'); |
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frameT(1473:1600, :) = bsxfun(@times, frameT(1473:1600, :), sinWindowShort(129:end)'); |
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frameT(1601:end, :) = 0; |
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else |
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error('filterbank, l[20]: Unsupported window type input!') |
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end |
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frameF(:, channel) = mdct4(frameT(:, channel)); |
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elseif strcmp(frameType, 'LPS') |
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if strcmp(winType, 'KBD') |
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frameT(1:448, channel) = 0; |
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frameT(449:576, channel) = frameT(449:576, channel) .* kaiserWindowShort(1:128)'; |
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frameT(1025:end, channel) = frameT(1025:end, channel) .* kaiserWindowLong(1025:end)'; |
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elseif strcmp(winType, 'SIN') |
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frameT(1:448, channel) = 0; |
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frameT(449:576, channel) = frameT(449:576, channel) .* sinWindowShort(1:128)'; |
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frameT(1025:end, channel) = frameT(1025:end, channel) .* sinWindowLong(1025:end)'; |
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else |
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error('filterbank, l[20]: Unsupported window type input!') |
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end |
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frameF = mdct4(frameT); |
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elseif strcmp(frameType, 'LPS') |
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if strcmp(winType, 'KBD') |
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frameT(1:448, :) = 0; |
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frameT(449:576, :) = bsxfun(@times, frameT(449:576, :), kaiserWindowShort(1:128)'); |
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frameT(1025:end, :) = bsxfun(@times, frameT(1025:end, :), kaiserWindowLong(1025:end)'); |
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elseif strcmp(winType, 'SIN') |
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frameT(1:448, :) = 0; |
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frameT(449:576, :) = bsxfun(@times, frameT(449:576, :), sinWindowShort(1:128)'); |
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frameT(1025:end, :) = bsxfun(@times, frameT(1025:end, :), sinWindowLong(1025:end)'); |
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else |
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error('filterbank, l[20]: Unsupported window type input!') |
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end |
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frameF(:, channel) = mdct4(frameT(:, channel)); |
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elseif strcmp(frameType, 'ESH') |
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frameF = mdct4(frameT); |
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elseif strcmp(frameType, 'ESH') |
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for channel = 1:2 |
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% Splits the frame into sub-frames |
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[subFrames, ~] = buffer(frameT(449:end-448, channel), 256, 128, 'nodelay'); |
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@ -96,7 +92,8 @@ function frameF = filterbank(frameT, frameType, winType) |
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end |
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for subFrameIndex = 1:8 |
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frameF((subFrameIndex - 1) * 128 + 1:subFrameIndex * 128, channel) = mdct4(subFrames(:, subFrameIndex)); |
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frameF((subFrameIndex - 1) * 128 + 1:subFrameIndex * 128, channel) = ... |
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mdct4(subFrames(:, subFrameIndex)); |
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end |
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end |
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end |
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