Maximum output level automatic measuring apparatus
US4489353A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 13, 1982 |
| Grant date | Dec 18, 1984 |
| Priority date | — |
| Expiry date | Oct 13, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/182
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A maximum output level automatic measuring apparatus comprises a testing signal generating circuit for generating a plurality of testing signals having different frequencies, by independently varying respective levels of the testing signals, a recording and reproducing circuit for recording the plurality of testing signals from the testing signal generating circuit onto a magnetic recording medium, and reproducing the recorded testing signals, a level detector for detecting reproduced levels of the plurality of testing signals from the recording and reproducing circuit, and a display device for displaying a maximum output level curve according to reproduced levels detected at the level detecting circuit. The level detector detects that reproduced levels of the plurality of testing signals have reached predetermined values preset with respect to the respective testing signals. The display device comprises a display screen having a frequency axis and a level axis, and independently displays the reproduced levels which reached the predetermined values detected by the level detector for each of the frequencies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.