Record amplifying circuit for respectively serially and differentially driving sets of series-connected sound and video record heads
AssigneeKabushiki Kaisha Toshiba
InventorToshikazu Fujii
Life of this patent
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Abstract
A DC feed-back circuit for causing a DC voltage of an external transistor in which an output bias current of a record amplifier flows to be equal to a DC voltage of an output terminal is provided so as to decrease power consumption. Thus, a plurality of record amplifying circuits can be incorporated into one IC chip. In particular, in home-use Hi-Fi VCRs, a Hi-Fi record amplifying circuit and video record amplifying circuits can be incorporated into one chip.
Claims11
A record amplifying circuit for a magnetic record and playback apparatus having low power consumption, comprising:
- a set of sound record heads connected in series;
- a set of video record heads connected in series;
- means for inputting an audio signal and a video signal;
- means for driving said set of sound record heads in series to decrease power consumption of the record amplifying circuit;
- means for differentially driving said set of video record heads to suppress distortion of the video signal and to further decrease the power consumption of the record amplifying circuit;
- and
- means for converting the video input signal into differential video signals and for providing each of the differential video signals to the means for differentially driving said set of video record heads.
An amplifying apparatus having low power consumption, comprising:
- a first recording means having at least two record heads connected in series;
- a second recording means having at least two heads connected in series;
- means for inputting first and second signals;
- a first amplifying means for driving said first recording means such that power consumption of the amplifying apparatus is decreased;
- a second amplifying means for differentially driving said second recording means to suppress distortion of the second input signal and to further decrease the power consumption of the amplifying apparatus;
- and
- converting means for converting the second input signal into differential signals and for providing each of the differential signals to the second amplifying means.
An amplifying apparatus having low power consumption, comprising:
- two Hi-Fi record heads connected in series;
- two video record heads connected in series;
- a sound record amplifying circuit driving said two Hi-Fi record heads such that power consumption of the amplifying apparatus is reduced;
- two video recording amplifying circuits differentially driving said two video record heads to suppress distortion of an input signal and to further reduce the power consumption of the amplifying apparatus;
- and
- a signal input differential output amplifier converting the input signal into differential signals and providing said differential signal to said two video recording amplifying circuits.
A rotary cylinder for use in a Hi-Fi videocassette recorder, the rotary cylinder comprising:
- two Hi-Fi record heads connected in series;
- two video record heads connected in series;
- and
- an IC having a sound record amplifying circuit, two video recording amplifying circuits, and a signal input differential output amplifier;
- said sound record amplifying circuit driving said two Hi-Fi record heads such that power consumption of the IC is reduced;
- said two video recording amplifying circuits differentially driving said two video record heads to suppress distortion of an input signal and to further reduce the power consumption of the IC;
- said signal input differential output amplifier converting the input signal into differential signals and providing said differential signals to said two video recording amplifying circuits.
Dependencies are inferred from the claim text.