Electronic frequency-tuning mechanism专利检索-仪表放大器差分放大器电子零件及设备专利检索查询-专利查询网

Electronic frequency-tuning mechanism

阅读：667发布：2022-06-01

专利汇可以提供Electronic frequency-tuning mechanism专利检索，专利查询，专利分析的服务。并且This invention is concerned with an electronic mechanism for tuning musical instruments and other frequency-generating devices, by means of a meter eliminating the necessity of a trained human ear. The mechanism provides means for feeding the input signal to a preamplifier; feeding the amplified signal to a clipper; feeding the output of the clipper to both a divider and to a differentiator; thence, to a selector switch which may be used to divide or multiply the frequency of the signal by powers of two. The signal is then fed to a standard pulse generator and from there to a meter circuit which may be of the D''Arsonvaltype. The readings on the meter will indicate to the operator to what extent the frequency of the musical instrument is tuned since the mechanism is already calibrated in accordance with the position of the selector switch to a specific frequency.，下面是Electronic frequency-tuning mechanism专利的具体信息内容。

权利要求

1. A mechanism for measuring and determining the pitch of sound or the frequency of a musical instrument or a signal generator comprising an input device, a clipper circuit having an output, a switching means connected to said output, a first differentiator connected to said switching means, a standard pulse generator, the output of the said differentiator connected to said pulse generator, a meter circuit, said standard pulse generator having an output circuit, said output circuit connected to said meter circuit, said meter circuit connected to a meter, a divider circuit, said divider circuit connected to said clipper circuit, the output of said divider being connected to said switching means, whereby said switching means allows the selection of fundamental or subharmonic frequencies, said switching means being connected to said first differentiator, means for connecting the output of said differentiator to a logical OR gate; said logical OR gate being connected to the input of said pulse generator, a second differentiator connected to a second output of the said clipper circuit of opposite phase from the first input, and to said OR gate, whereby two pulses are applied to the input of the pulse generator for every cycle of the input signal.

2. A mechanism as described in claim 1 having a plurality of divider circuits, said switching means connected to the output of said clipper circuit and said switching means connected to each of said plurality of divider circuits, and said switching means connected to said OR gate, each of said divider circuits being calibrated to divide by two the frequency of its input signal, whereby the operation of the switching means determines the octave or range of the frequency under test.

3. A mechanism as described in claim 2 wherein said meter circuit comprises an input, said input being connected to the output of the pulse generator, said input comprising a low-pass filter, a first diode connected also to the output of said low-pass filter, a resistor, a meter, said resistor connected to said meter, said first diode connected in parallel and across said resistor and said meter, whereby a nonlinear frequency scale at the upper end of said meter range is created, the output of said diode and said resistor-meter connected to a second diode, a source of voltage, said second diode having an output connected to said source of voltage, a variable means for controlling and presetting the voltage source whereby range selection is obtained and whereby the meter scale is adjusted to different readings to accommodate different frequencies.

4. A mechanism as described in claim 1 wherein said meter circuit compriSes an input, said input being connected to the output of the pulse generator, said input comprising a low-pass filter, a first diode connected also to the output of said low-pass filter, a resistor, a meter, said resistor connected to said meter, said first diode connected in parallel and across said resistor and said meter, whereby a nonlinear frequency scale at the upper end of said meter range is created, the output of said diode and said resistor-meter connected to a second diode, a source of voltage, said second diode having an output connected to said source of voltage, a variable means for controlling and presetting the voltage source whereby range selection is obtained and whereby the meter scale is adjusted to different readings to accommodate different frequencies.

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Electronic frequency-tuning mechanism

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