| 摘要 |
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 pulse width converter provided in correspondence with respective bandpass filters, for converting the input signal into a signal in synchronism with a vertical synchronizing signal of a video signal and having a pulse width in accordance with the level of the vertical synchronizing signal, a level indication signal producing circuit connected with outputs of the pulse width converter in parallel, for serially producing the converted pulse signal in synchronism with a horizontal synchronizing signal by successively time-dividing the converted pulse signal during a horizontal 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. Bars corresponding to the audio signal level in a vertical direction, characters, and the like, are composed and displayed on a screen of a picture tube, by the outputs of the level indication signal producing circuit and the character indication signal producing circuit.
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