US4163264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise improvement by capacitor bank in magnetic recording and playback apparatus
Assignee: Toshiba Corp
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Filing: 1977-02-14
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Granted: 1979-07-31
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Expires: 1997-02-14
Abstract
Abstract A magnetic recording and playback apparatus adapted to decrease tape hiss noises, wherein an amplifier power supply circuit or an output circuit for coupling an output from a recording amplifier to a magnetic head is provided with a capacitor block whose internal loss decreases as frequency increases and consisting of a plurality of capacitors. The capacitor block is formed by connecting with an electrolytic capacitor of a large capacitance included in the power supply circuit or output circuit at least one nonpolarized capacitor having a smaller capacitance and smaller internal loss than the electrolytic capacitor.
Inventors
- 👤 Kazuo Ishii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:45
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; G11B23/00; G11B23/0007; H; H03; H03F; H03F3/00; H03F3/26; H03G; H03G5/00; H03G5/02; H03G5/04; H03G5/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
172 words
A magnetic recording and reproduction apparatus comprising: a recording amplifier for amplifying an audio signal; a recording magnetic head for recording an output signal from said recording amplifier on a magnetic tape; an output circuit for coupling the output signal of said recording amplifier to said recording magnetic head; an oscillator for supplying a high frequency bias signal to said recording magnetic head at the time of the recording; a reproduction magnetic head for reproducing a signal recorded on the magnetic tape; a reproduction amplifier for amplifying an output signal from said reproduction magnetic head; and a power supply circuit for impressing a supply voltage to said recording amplifier; and said output circuit provided with a capacitor block comprising means for reducing harmonic distortion, said means comprising a plurality of capacitors connected in parallel and having successively smaller capacitance values, with at least one of the smaller value capacitors being of the lower inner loss type; whereby the effective internal loss of said block of capacitors is decreased and harmonic distortion reduced.
Claim 2
Dependent Claim
172 words
A magnetic recording and reproduction apparatus comprising: a recording amplifier for amplifying an audio signal; a recording magnetic head for recording an output signal from said recording amplifier on a magnetic tape; an output circuit for coupling the output signal of said recording amplifier to said recording magnetic head; an oscillator for supplying a high frequency bias signal to said recording magnetic head at the time of the recording; a reproduction magnetic head for reproducing a signal recorded on the magnetic tape; a reproduction amplifier for amplifying an output signal from said reproduction magnetic head; and a power supply circuit for impressing a supply voltage to said recording amplifier; and said output circuit provided with a capacitor block comprising means for reducing harmonic distortion, said means comprising a plurality of capacitors connected in parallel and having successively smaller capacitance values, with at least one of the smaller value capacitors being of the lower inner loss type; whereby the effective internal loss of said block of capacitors is decreased and harmonic distortion reduced.
Claim 3
Dependent Claim
64 words
The magnetic recording and reproduction apparatus according to claim 1, wherein said capacitor block comprises a large capacitance electrolytic capacitor and a low internal loss type nonpolarized capacitor having a sufficiently smaller capacitance than said electrolytic capacitor to permit the passage of a signal having a frequency higher than a mid-frequency in the audible frequency range and connected in parallel to said electrolytic capacitor.
Claim 4
Dependent Claim
18 words
The magnetic recording and reproduction apparatus according to claim 2 wherein said nonpolarized capacitor is a Mylar capacitor.
Claim 5
Dependent Claim
18 words
The magnetic recording and reproduction apparatus according to claim 2 wherein said nonpolarized capacitor is a polypropylene capacitor.
Claim 6
Dependent Claim
18 words
The magnetic recording and reproduction apparatus according to claim 2 wherein said nonpolarized capacitor is a styrol capacitor.
Claim 7
Dependent Claim
114 words
The magnetic recording and reproduction apparatus according to claim 1, wherein said capacitor block comprises a large capacitance electrolytic capacitor; a first low internal loss type nonpolarized capacitor having a sufficiently smaller capacitance than said electrolytic capacitor to permit the passage of a signal having a mid frequency in the audible frequency range and connected in parallel to said electrolytic capacitor; and a second low internal loss type nonpolarized capacitor having a sufficiently smaller capacitance than said first nonpolarized capacitor to permit the passage of a signal having a high frequency included in the audio frequency range, and less internal loss than said first nonpolarized capacitor and connected in parallel to said electrolytic capacitor.
Claim 8
Dependent Claim
28 words
The magnetic recording and reproduction apparatus according to claim 6 wherein said first nonpolarized capacitor is a Mylar capacitor and said second nonpolarized capacitor is a polypropylene capacitor.
Claim 9
Dependent Claim
28 words
The magnetic recording and reproduction apparatus according to claim 6 wherein said first nonpolarized capacitor is a Mylar capacitor and said second nonpolarized capacitor is a styrol capacitor.
Claim 10
Dependent Claim
32 words
The magnetic recording and reproduction apparatus according to claim 7 further comprising a styrol capacitor having a capacitance value smaller than said first and second nonpolarized capacitors and connected in parallel thereto.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-30 | 1983-01-29 | 1983-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-30 | 1987-01-29 | 1987-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-30 | 1991-01-29 | 1991-07-31 | $7700.00 | Window Closed / Lapsed |