Dc keyed synthesis organ employing an integrated circuit专利检索-正弦波滤波器变压器和转换设备专利检索查询-专利查询网

Dc keyed synthesis organ employing an integrated circuit

阅读：946发布：2023-05-13

专利汇可以提供Dc keyed synthesis organ employing an integrated circuit专利检索，专利查询，专利分析的服务。并且A synthesis-type organ with direct current keying, envelope shaping and individual harmonic scaling particularly adapted to be compatible with frequency divider and MOSFET integrated circuit techniques. A DC voltage is scaled to several appropriate selected levels for the fundamental and individual harmonics and chopped by tone signals for the fundamental and selected harmonics to provide a collection of appropriately scaled square wave signals at the chopping frequencies. These square waves are individually keyed with appropriate envelope control through band pass sine filters adapted to reject all but the fundamentals of the keyed signals. The filtered outputs are mixed to supply output musical signals of appropriate harmonic quality having a desirable attack and decay envelope.，下面是Dc keyed synthesis organ employing an integrated circuit专利的具体信息内容。

权利要求

1. A keying system for simultaneously keying the desired group of harmonics for a note of a synthesis-type electric organ having a multiplicity of square-wave tone signals, said signals providing fundamentals of the frequencies of the harmonics to be keyed, said keying system to be used with other like systems for other notes of the organ, comprising a keying block, said block comprising a substrate having a plurality of substantially identical sections thereon, one section for each of the harmonics to be keyed, each of said sections having a first and a second field effect transistor formed thereon, all of said transistors having an input, a gate and an output, a direct current supply connected to the input of the first of said transistors of each section, means for establishing the voltage level of said direct current supply at any of several levels individually for each section, circuit means connecting the output of the first transistor of each section to the input of the second of said transistors of the same section, a group of sine filters connected individually to the outputs of said second of said transistors for summing and filtering the signals from the last said outputs to remove all but the fundamentals from the last said signals, a common output circuit connected to receive the signals from said filters, circuit means connecting the squarewave signals individually to the gates of one of the transistors of each sectiOn, and means including a source of keying potential and playing key actuated contacts connected for applying said keying potential to the gates of the other transistors of the block when said playing key contacts are actuated.

2. The keying system as called for in claim 1 in which the means for establishing the direct current voltage level individually for each of the sections of said block also establishes the same voltage levels for the same harmonics for other blocks connected to key other notes.

3. The keying system called for in claim 1 in which said group of nine filters individually are connected to filter six to 18 adjacent semitone note signals of the organ.

4. The keying system called for in claim 1 including means for applying an attack and decay envelope to the keying potential when said playing key contacts are actuated.

5. The keying system called for in claim 1 in which all of said transistors are of MOSFET type.

6. The keying system called for in claim 2 in which said group of nine filters individually are connected to filter six to 18 adjacent semitone note signals of the organ.

7. The keying system called for in claim 2 including means for applying an attack and decay envelope to the keying potential when said playing key contacts are actuated.

8. The keying system called for in claim 3 including means for applying an attack and decay envelope to the keying potential when said playing key contacts are actuated.

9. The keying system called for in claim 2 in which all of said transistors are of MOSFET type. 10. The keying system called for in claim 3 in which all of said transistors are of MOSFET type.

11. The keying system called for in claim 4 in which all of said transistors are of MOSFET type.

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Dc keyed synthesis organ employing an integrated circuit

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