Module: WavSpectrumAnalyzer::FFTApp

Extended by:
Common
Defined in:
lib/wavspa/wavfft/main.rb,
lib/wavspa/wavfft/preset.rb

Constant Summary collapse

PRESET_TABLE = 
{
  "default" => {
    :unit_time       => 10,
    :fft_size        => 16384,
    :output_width    => 240,
    :window_function => :FLAT_TOP,
    :scale_mode      => :LOGSCALE,
    :transform_mode  => :POWER,
    :range           => [200, 8000],
    :ceil            => -10.0,
    :floor           => -90.0,
    :luminance       => 3.5,
    :col_step        => 1,
  },

  "32k" => {
    :unit_time       => 5,
    :fft_size        => 32768,
    :output_width    => 360,
    :window_function => :FLAT_TOP,
    :scale_mode      => :LOGSCALE,
    :transform_mode  => :POWER,
    :range           => [200, 16000],
    :ceil            => -10.0,
    :floor           => -90.0,
    :luminance       => 3.5,
    :col_step        => 1,
  },

  "cd" => {
    :unit_time       => 5,
    :fft_size        => 32768,
    :output_width    => 480,
    :window_function => :FLAT_TOP,
    :scale_mode      => :LOGSCALE,
    :transform_mode  => :POWER,
    :range           => [50, 22000],
    :ceil            => -10.0,
    :floor           => -90.0,
    :luminance       => 3.5,
    :col_step        => 1,
  },

  "highreso" => {
    :unit_time       => 5,
    :fft_size        => 131072,
    :window_function => :FLAT_TOP,
    :output_width    => 640,
    :scale_mode      => :LOGSCALE,
    :transform_mode  => :POWER,
    :range           => [200, 32000],
    :ceil            => -10.0,
    :floor           => -90.0,
    :luminance       => 3.5,
    :col_step        => 1,
  },
}

Class Method Summary collapse

Methods included from Common

down_step, draw_freq_line, draw_time_line, fpos, linear_scaler, log_scaler, time_str, up_step

Class Method Details

.load_param(param) ⇒ Object 



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# File 'lib/wavspa/wavfft/main.rb', line 21

def load_param(param)
  @transform_mode = param[:transform_mode]
  @unit_time      = param[:unit_time]
  @fft_size       = param[:fft_size]
  @output_width   = param[:output_width]
  @win_func       = param[:window_function]
                 
  @freq_range     = param[:range]
  @ceil           = param[:ceil]
  @floor          = param[:floor]
  @luminance      = param[:luminance]
  @col_step       = param[:col_step]
                 
  @scale_mode     = param[:scale_mode]
  @logscale       = (param[:scale_mode] == :LOGSCALE)
  @basis_freq     = param[:basis_freq] || 440.0 
  @grid_step      = param[:grid_step] || ((@logscale)? 2.0: 2000.0)
                 
  @lo_freq        = @freq_range[0]
  @hi_freq        = @freq_range[1]
  @freq_width     = (@hi_freq - @lo_freq)
                 
  @log_step       = (@hi_freq / @lo_freq) ** (1.0 / @output_width)
  @log_base       = Math.log(@log_step)
end

.main(input, param, output) ⇒ Object 



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# File 'lib/wavspa/wavfft/main.rb', line 48

def main(input, param, output)
  load_param(param)

  wav = WavFile.open(input)
  fft = FFT.new("s%dle" % wav.sample_size, @fft_size)

  fft.window     = @win_func
  fft.width      = @output_width
  fft.scale_mode = @scale_mode
  fft.frequency  = @freq_range.clone.unshift(wav.sample_rate)

  rows  = 0
  usize = (wav.sample_rate / 100) * @unit_time
  nblk  = (wav.data_size / (wav.sample_size / 8)) / usize

  fb    = FrameBuffer.new(nblk,
                          @output_width,
                          :column_step => @col_step,
                          :margin_x => ($draw_freq_line)? 50:0,
                          :margin_y => ($draw_time_line)? 30:0,
                          :ceil => @ceil,
                          :floor => @floor,
                          :luminance => @luminance)

  if $verbose
    STDERR.print <<~EOT
      - input data
        #{input}
          data size:   #{wav.data_size}
          channel num: #{wav.channel_num}
          sample rate: #{wav.sample_rate} Hz
          sample size: #{wav.sample_size} bits
          data rate:   #{wav.bytes_per_sec} bytes/sec

      - FFT parameter
          FFT size:    #{@fft_size} samples
          unit time:   #{@unit_time} cs
          window func: #{@win_func}

      - OUTPUT
          width:       #{fb.width}px
          height:      #{fb.height}px
          freq range:  #{@lo_freq} - #{@hi_freq}Hz
          scale mode:  #{@scale_mode}
          plot mode :  #{@transform_mode}
          ceil:        #{@ceil}
          floor:       #{@floor}

    EOT
  end

  if wav.channel_num >= 2
    error("error: multi chanel data is not supported " \
          "(support only monoral data).")
  end
 
  until rows >= nblk
    STDERR.printf("\rtransform #{rows + 1}/#{nblk}", rows) if $verbose

    fft << wav.read(usize)

    if @transform_mode == :POWER
      fb.draw_power(rows, fft.power)
    else
      fb.draw_amplitude(rows, fft.amplitude)
    end

    rows += 1
  end

  STDERR.printf(" ... done\n") if $verbose

  STDERR.printf("write to #{output} ... ") if $verbose

  draw_freq_line(fb) if $draw_freq_line
  draw_time_line(fb, wav, usize) if $draw_time_line

  png = PNG.encode(fb.width, fb.height, fb.to_s, :pixel_format => :RGB)
  IO.binwrite(output, png)

  STDERR.printf("done\n") if $verbose
end