Spectrum display device for audio signals

A spectrum display device for an audio signal comprising:

• (a) band-separating means for dividing an input audio signal into plural signals each having one of plural frequency bands;
• (b) a plurality of analog-to-digital converting means for respectively simultaneously converting a plurality of output signals from said band-separating means into digital signals at different sampling frequencies;
• (c) a central processing unit for effecting (i) FFT operation in connection with the digital signals derived from said plurality of analog-to-digital converting means, (ii) power spectrum calculation in connection with the result of the FFT operation to obtain power spectrum data, (iii) converting said power spectrum data into pattern information corresponding to the amplitude of a plurality of frequencies within a spectrum of said input audio signal, and (iv) deriving data indicative of said pattern information;
• and
• (d) a video display processor having a display unit having a screen and video RAM for storing picture data, said display processor being supplied with the pattern information data from said central processing unit for generating a video signal in response to the picture data stored in the video RAM to thereby display a power spectrum by way of said pattern on the screen of the display unit such that said plural frequencies within said spectrum are arranged in sequence on the screen of the display unit.

A spectrum display device for an audio signal comprising:

• (a) band-separating means for dividing an input audio signal into several signals one for each of plural frequency bands;
• (b) analog-to-digital converting means for respectively converting a plurality of output signals derived from said band-separating means into digital signals at different sampling frequencies;
• (c) a plurality of central processing units for (i) effecting FFT operation in connection with the digital signals derived from said analog-to-digital converting means, (ii) effecting power spectrum calculation in connection with the result of the FFT operation to obtain power spectrum data, (iii) converting said power spectrum data into pattern information corresponding to amplitudes of a plurality of frequencies within a spectrum of said input audio signal, and (iv) deriving data indicative of said pattern information, one of said central processing units being arranged to effect FFT operation and power spectrum calculation in connection with the digital signals of a predetermined frequency band among said plurality of frequency bands, said plurality of central processing units being connected to be mutually responsive to each other so that given operations are performed with appropriate timing in each of said plurality of central processing units;
• and
• (d) a video display processor having a display unit with a screen and a video RAM for storing picture data, said display processor being supplied with the output data from said plurality of central processing units for generating a video signal using the picture data stored in the video RAM to thereby display a power spectrum by way of said pattern on the screen of the display unit such that said plurality of frequencies within said spectrum are arranged in sequence.

A spectrum display device for an audio signal comprising:

• (a) band-separating means for dividing an input audio signal into several signals one for each of plural frequency bands;
• (b) a plurality of analog-to-digital converting means for respectively simultaneously converting a plurality of output signals from said band-separating means into digital signals at different sampling frequencies;
• (c) a plurality of central processing units for (i) effecting FFT operation in connection with the digital signals derived from said plurality of analog-to-digital converting means, (ii) effecting power spectrum calculation in connection with the result of the FFT operation to obtain power spectrum data, (iii) converting said power spectrum data into pattern information corresponding to the amplitudes of plural frequencies within a spectrum of said input audio signal, and (iv) deriving data indicative of said pattern information, one of said central processing units being arranged to effect FFT operation and power spectrum calculation in connection with the digital signals of a predetermined frequency band among said plurality of frequency bands, said plurality of central processing units being connected to be mutually responsive to each other so that given operations are performed at appropriate timing in each of said plurality of central processing units;
• and
• (d) a video display processor having a display unit with a screen and a video RAM for storing picture data, said display processor being supplied with the output data from said plurality of central processing units for generating a video signal using the picture data stored in the video RAM to thereby display a power spectrum by way of said pattern on a screen of a display unit such that said plurality of frequencies within said spectrum are arranged in sequence.

A method of displaying a spectrum of an audio signal comprising:

• (a) separating an input audio signal into a plurality of output signals one for each of plural frequency bands;
• (b) respectively converting the plurality of output signals into digital signals at different sampling frequencies;
• (c) activating plural central processing units to:
• (i) perform FFT operations on the converted digital signals, (ii) perform a power spectrum calculation on the results of the FFT operations to obtain power spectrum data, (iii) convert said power spectrum data into pattern information corresponding to amplitudes of plural frequencies within a spectrum of said input audio signal, and (iv) derive data indicative of said pattern information, one of said central processing units performing an FFT operation and power spectrum calculation in connection with the digital signal of a predetermined frequency band among said plurality of frequency bands, said plural central processing units being mutually responsive to each other so that given operations are performed with appropriate timing in each of said plural central processing units;
• and
• (d) activating a video display processor so it is supplied with the output data of said plural central processing units to generate a video signal using picture data stored in a video RAM to thereby display a power spectrum by way of said pattern on a screen of a display unit such that said plural frequencies within said spectrum are arranged in sequence.

A method of displaying a spectrum of an audio signal comprising:

• (a) separating an input audio signal into a plurality of output signals one for each of plural frequency bands;
• (b) respectively simultaneously converting the plurality of output signals into digital signals at different sampling frequencies;
• (c) activating plural central processing units to:
• (i) perform FFT operations on the converted digital signals, (ii) perform a power spectrum calculation on the result of the FFT operations to obtain power spectrum data, (iii) convert said power spectrum data into pattern information corresponding to the amplitudes of plural frequencies within a spectrum of said input audio signal, and (iv) derive data indicative of said pattern information, one of said central processing units performing an FFT operation and power spectrum calculation in connection with the digital signals of a predetermined frequency band among said plurality of frequency bands, said plural central processing units being mutually responsive to each other so that given operations are performed at appropriate timing in each of said plural central processing units;
• and
• (d) activating a video display processor so it is supplied with the output data of said plural central processing units to generate a video signal using picture data stored in a video RAM to thereby display a power spectrum by way of said pattern on a screen of a display unit such that said plural frequencies within said spectrum are arranged in sequence.