US4732072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio teaching system for use in choral instruction
Assignee: Individual
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Filing: 1987-04-06
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Granted: 1988-03-22
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Expires: 2007-04-06
Abstract
Abstract An audio teaching system for use in choral instruction is illustrated having a four-track cassette recorder/player interconnected with a four-channel amplifier leading to a set of earphone amplifier control boxes, each having a single earphone attached thereto. The system provides for said cassette player to be used in conjunction with specially prepared tapes having the four harmonic parts of the music selection recorded on separate channels. Each of said control boxes has its own volume control, amplifier, single earphone, and also contains a selector switch which allows the choir member to choose to monitor one or all of the harmonic parts.
Inventors
- 👤 Frank W. Garlock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:05
CPC Classifications
G; G09; G09B; G09B15/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
138 words
For use in choral instruction, an audio teaching system comprising: a recorder/player having at least four channels; a low noise, amplifier for said four channels; a mixer and equalizer for said four channels having the capability to record or play said four channels simultaneously with said channels being in the same direction and syncronized; a plurality of earphone amplifier control boxes connected in series; each of said control boxes having a selector switch for choosing any of the said four channels or a mix-down of all four channels; an isolation operational amplifier which provides additional gain to drive said earphones while isolating said earphones from the main amplifier; a volume control for said isolation operational amplifier permitting the listener autonomy over the level of the chosen signal; a single earphone; and an earphone connection to accommodate said earphone.
Claim 2
Dependent Claim
138 words
For use in choral instruction, an audio teaching system comprising: a recorder/player having at least four channels; a low noise, amplifier for said four channels; a mixer and equalizer for said four channels having the capability to record or play said four channels simultaneously with said channels being in the same direction and syncronized; a plurality of earphone amplifier control boxes connected in series; each of said control boxes having a selector switch for choosing any of the said four channels or a mix-down of all four channels; an isolation operational amplifier which provides additional gain to drive said earphones while isolating said earphones from the main amplifier; a volume control for said isolation operational amplifier permitting the listener autonomy over the level of the chosen signal; a single earphone; and an earphone connection to accommodate said earphone.
Claim 3
Dependent Claim
72 words
The audio teaching system set forth in claim 1 including a plug carried by each control box for connecting each control box in series with a preceding control box, and means in each of said control boxes containing an excess length of cable connected to said plugs while permitting a selected length of cable to be withdrawn from and to extend from said control box for connection to said preceding control box.
Claim 4
Dependent Claim
34 words
The audio teaching system set forth in claim 2 including Velcro fastening means carried by a support convenient to a user and by said control box for positioning said control boxes on said support.
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) | 1991-03-22 | 1991-09-21 | 1992-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-22 | 1995-09-21 | 1996-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-22 | 1999-09-21 | 2000-03-22 | $7700.00 | Window Closed / Lapsed |