Digital cassette tape reproducing device including novel drive circuit
US5309297A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 14, 1992 |
| Grant date | May 3, 1994 |
| Priority date | — |
| Expiry date | Oct 14, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B25/063
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A power amplifier of a digital cassette tape reproducing device is set to a value suitable to amplify an amplitude level of an audio signal from an analog signal reproducing system thereof and, when a digital signal reproducing system is selected, an audio signal therefrom is supplied to the power amplifier circuit without attenuation while increasing an amount of negative feedback of the power amplifier circuit, hence reducing amplification thereof to match an output level of the power amplifier circuit with that of the analog signal reproducing system to thereby improve S/N ratio and maintain high tone quality of the digital source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.