| 摘要 |
This invention deals with significant innovations on multiphase signal oscillators including quadrature oscillators for the use in frequency shifters, or sequential gating devices for special multichannel sound effects, or three-phase power sources or other electronic apparatus. These innovations or the combination thereof consist of (1) the serial arrangement of two or more than two all-pass phase filter sections in a feedback loop to form an oscillator with a frequency stability and purity heretofore not attainable with cascaded integrator type quadrature or multiphase signal oscillators, (2) the inclusion of circuitry to secure an immediate start of oscillation at very low frequencies, (3) the inclusion of known means for amplitude limitation, (4) the inclusion of operational transconductance amplifiers for wide range voltage controlled frequency determination or (5) alternate types or means for frequency control including but not limited to known means for pulse width control of the frequency determining resistors.
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