US3890602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waveform producing device
Assignee: Nippon Gakki Co Ltd
•
Filing: 1973-10-23
•
Granted: 1975-06-17
•
Expires: 1993-10-23
Abstract
Abstract A single resistor bar having a plurality of connection points is formed by a diffused layer on a semiconduuctor substrate. A predetermined voltage is applied across the resistance layer so that the respective connection points exhibit different potentials. A decoder designates, via a reading switch circuit and successively at a predetermined time rate and order, which of the potentials to read out. Thus sequentially read-out voltages constitute a waveform of a particular tone color or an envelope of a particular shape. The decoder and the reading switch circuit may be formed by MOS transistors, and the circuits thus formed may be combined together with the resistance layer in an integrated structure on the semiconductor substrate.
Inventors
- 👤 Norio Tomisawa
- 👤 Yasuji Uchiyama
- 👤 Takatoshi Okumura
- 👤 Toshio Takeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:35
CPC Classifications
G; G10; G10H; G10H7/00; G10H7/02; H; H03; H03M; H03M1/00; H10; H10D; H10D84/00; H10D84/201; H10D84/204; H10D84/209; H10D84/80; H10D84/811; H03M1/06; H03M1/0617
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
87 words
A waveform producing device which comprises, a. a resistor zone of a diffused layer formed on a semiconductor substrate and having a plurality of connection points, b. means for applying a predetermined voltage across the resistor zone so that different potentials appear at the respective connection points, and c. a reading circuit for reading the different potentials at the connection points in a predetermined order, so that a waveform having variation of amplitudes corresponding to variation of the potentials at the connection points thus read is produced.
Claim 2
Dependent Claim
87 words
A waveform producing device which comprises, a. a resistor zone of a diffused layer formed on a semiconductor substrate and having a plurality of connection points, b. means for applying a predetermined voltage across the resistor zone so that different potentials appear at the respective connection points, and c. a reading circuit for reading the different potentials at the connection points in a predetermined order, so that a waveform having variation of amplitudes corresponding to variation of the potentials at the connection points thus read is produced.
Claim 3
Dependent Claim
75 words
A waveform producing device as claimed in claim 1 in which said reading circuit comprises a. a read-out switching circuit having a plurality of switching transistors with input terminals connected to said connection points and with a common output terminal, and b. an addressing circuit for turning on the switching transistors in a predetermined order according to binary-coded signals to drive the switching circuit so as to produce said waveform at the common output terminal.
Claim 4
Dependent Claim
52 words
A waveform producing device as claimed in claim 2 in which said switching transistors are MOS transistors, said addressing circuit includes a decoder formed by a plurality of MOS transistors, said switching circuit and the decoder together with said diffused resistance layer being combined in an integrated structure on said semiconductor substrate.
Claim 5
Dependent Claim
29 words
A waveform producing device as claimed in claim 1 in which said voltage is applied through at least one resistor to the connection points on said diffused resistance layer.
Claim 6
Dependent Claim
23 words
A waveform producing device as claimed in claim 4 in which said resistor is a diffused resistance layer formed on said semiconductor substrate.
Claim 7
Dependent Claim
24 words
A waveform producing device as claimed in claim 4 in which a connection point connected with said resistor is shorted by another connection point.
Claim 8
Dependent Claim
25 words
A waveform producing device as claimed in claim 4 in which connection points to which said resistor is not connected are connected to each other.
Claim 9
Dependent Claim
38 words
A waveform producing device as claimed in claim 1 in which said voltage is applied to said diffused resistance layer through a resistor for every predetermined number of connection points and a multiple T-type attenuation circuit is formed.
References Cited (Backward Citations)
US3721964A
Cited
US3735367A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |