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 Digital graphic equalizer

Details
Inventors: Kitazato, Naohisa; Hamada, Osamu;
Assignee: Sony Corporation (Tokyo, JP)
Primary Examiner: Isen; Forester W.
Assistant Examiner:
Attorney, Agent or Firm: Eslinger; Lewis H., Sinderbrand; Alvin

A digital graphic equalizer includes a pulse-sequence generator for generating a sequence of pulse signals, a first digital signal processor for filtering the pulse signals to produce a filtered signal, a digital-to-analog converter responsive to the filtered signal for producing a calibrating signal, and a loudspeaker responsive to the calibrating signal for propagating a calibrating sound in a listening environment, the frequency characteristics of the calibrating sound being subject to modification by the listening environment. A detector detects the calibrating sound as propagated in the listening environment and produces a detection signal representative thereof. An analog-to-digital converter is responsive to the detection signal for producing a digital signal corresponding thereto, and a second digital signal processor is responsive to the digital signal for producing a plurality of frequency-divided signals. A spectrum analyzer is responsive to the frequency-divided signals for analyzing the frequency characteristics of the calibrating sound as propagated in the listening environment and producing a compensating signal adapted to compensate for the modification by the listening environment of the frequency characteristics of the calibrating sound.

DETAILED DESCRIPTION An object of the invention is to remedy the major problems of prior digital graphic equalizers and, in particular, to provide an improved digital graphic equalizer including a digital signal processor for synthesizing a pink noise and performing a spectrum analysis.
Another object of the invention is to provide a digital graphic equalizer that can be easily calibrated in a plurality of listening environments to compensate for distortions of sound due to selective absorption or attenuation thereof at different frequencies and that thereafter can be configured in accordance with a selected one of the calibrations by the touch of a button, so that audio apparatus in which the graphic equalizer is incorporated can conveniently be moved from one such environment to another while always providing an optimum frequency response.
According to one aspect of the present invention, there is provided a digital graphic equalizer comprising: a pulse-sequence generator for generating a sequence of pulse signals; first digital signal processing means for filtering the pulse signals to produce a filtered signal; digital-to-analog converter means responsive to the filtered signal for producing a calibrating signal; loudspeaker means responsive to the calibrating signal for propagating a calibrating sound in a listening environment, the frequency characteristics of the calibrating sound being subject to modification by the listening environment; means for detecting the calibrating sound as propagated in the listening environment and producing a detection signal representative thereof; analog-to-digital converter means responsive to the detection signal for producing a digital signal corresponding thereto; second digital signal processing means responsive to the digital signal for producing a plurality of frequency-divided signals; and spectrum analyzer means responsive to the frequency-divided signals for analyzing the frequency characteristics of the calibrating sound as propagated in the listening environment and producing a compensating signal adapted to compensate for the modification thereof


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