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.
A television receiver includes a volume control circuit (4) for controlling levels of sound signals corresponding to a left channel, a right channel, a center channel and a surround channel and speakers (6 to 10) corresponding to these channels. The television receiver further comprises a test tone circuit (11; 18), a microcomputer (14) and a character display circuit (16). The test tone circuit (11; 18) supplies a test tone of a prescribed frequency sequentially to the speakers (6 to 10) through the volume control circuit (4). The microcomputer (14) provides a command to the character display circuit (16) so that a CRT 17) displays which speaker is currently supplied with the test tone as well as volume levels of the respective speakers.
The display screen of an electronic viewfinder displays camera setting information components outside the screne image, so that a camera operator can check the camera settings and possibly modify them to desired values without having to look away from the scene image. In the camera according to the invention, the sound recording level is displayed in the viewfinder as a bar whose length varies logarithmically. A stable presentation of the sound recording level is the result.
A waveform monitor for television has dual video channels displayed simultaneously side-by-side. The two channels are synchronized with each other or with an external sync signal and are input to a multiplexer prior to the display. A microprocessor controls the switching of the multiplexer according to the selection made by an operator. The first channel is displayed during the first half of the horizontal display sweep, and the second channel is displayed during the second half, the horizontal sweep encompassing two horizontal lines of video.
An audio sound modification system for modifying the output sound signals of a sound synthesizer comprises a microcomputer connected to receive signals from the synthesizer and to output modified sound signals. The microcomputer comprises a display device, and displays an image on the display device that has motion, color and shade characteristics. An operator input is also provided. The microcomputer is responsive to first, second and third different input signals from the operator input for modifying first, second and third different characteristics of the received signals and for modifying the motion, color and shade characteristics of the image, respectively.
A signal level display unit which makes adjustment for correcting of deviation unnecessary and enables cost reduction. An input analog audio signal 26 is divided into seven signals having different frequency bands, converted into digital signal by an A/D converter 22, input to a display controller 25, and temporarily stored in a storage unit 32. A preset recovery time which is input to the display controller 25 through an A/D converter 28 is also stored in the storage unit 32. The value of each signal newly input from the A/D converter 22 is compared with the current value stored in the storage unit 32. When the value of a newly input signal is higher than the current value, the value displayed by a liquid crystal indicator 23 is immediately renewed. On the other hand, when no signal having a higher value than the current value is input, the displayed value is renewed after the preset recovery time stored in the storage init 32 has elapsed.
