Display device for displaying audio signal levels and characters

Details Display device for displaying audio signal levels and characters Display device for displaying audio signal levels and characters

1982-08-30

1985-01-08

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Analysis of complex waves

381 48, G01R 2316

Patent

active

044929170

ABSTRACT:
A level display device for audio signal comprises a plurality of bandpass filters having filtering bands of respectively different center frequencies, for band-dividing and filtering an input signal supplied thereto through an input terminal, a level indication signal producing circuit for converting the input signal into a signal in synchronism with a horizontal synchronizing signal of a video signal and having a pulse width in accordance with the level of the horizontal synchronizing signal, and serially obtaining the converted signal in sychronism with a vertical synchronizing signal of the video signal by successive time-division carried out during a vertical scanning period, a character indication signal producing circuit stored with information signals for displaying characters and the like, for serially obtaining a character indication signal in synchronism with a synchronizing signal of the video signal, and a video signal composing circuit driven by the video signal, for obtaining a video signal by composing an output of the level indication signal producing circuit and an output of the character indication signal producing circuit. The level display device composes and displays bars in a horizontal direction corresponding to the audio signal level, characters, and the like, on a screen of a picture tube, by the outputs of the level indication signal producing circuit and the character indication signal producing circuit.

REFERENCES:
patent: 3387090 (1968-06-01), Bridges
patent: 4335276 (1982-06-01), Bull

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