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| I claim: 1. A method of improving the acoustics of a room having a performance area in which sound ... |
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| Cabinet for loudspeaker |
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| Loudspeaker structure |
| I claim: 1. An electro acoustical transducer structure, comprising; (a) a base enclosure of ... |
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| Stereo electroacoustical transducing |
| What is claimed is: 1. Stereo electroacoustical transducing apparatus comprising, dual-channel ... |
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| Multiple chamber loudspeaker system |
| It is an important object of this invention to provide an improved dual-chamber ported loudspeaker ... |
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| Speaker system |
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| Electric acoustic converter |
| It is the object of the present invention to provide an electric acoustic converter generative of ... |
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| Mid-range loudspeaker assembly propagating forward and backward sound waves in phase |
| Accordingly, it is an object of the present invention to provide a loudspeaker which reduces ... |
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| Highly directional sound projector and receiver apparatus |
| We claim: 1. An acoustic apparatus equally suitable for use in both a sound projector mode and a ... |
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| Subwoofer speaker system |
| The present invention includes the recognition of various problems found in previous designs. P... |
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Analog-to-digital converter
| Details |
Inventors: Zarabadi, Seyed R.; Komisarcik, Edward A.;
Assignee: Delco Electronics Corporation (Kokomo, IN)
Primary Examiner: Gaffin; Jeffrey A.
Assistant Examiner: Kost; Jason L. W.
Attorney, Agent or Firm: Funke; Jimmy L.
A converter for converting an analog signal into a digital representation having a most significant bit (MSB), upper-significant bits (USBs), and lower-significant bits (LSBs) with a least significant bit being a predetermined incremental voltage value. The converter is responsive to external signals and is adapted to receive a supply voltage. The analog-to-digital converter provides for a determination of the most significant bit (MSB) that does not rely on the ratio factor between the capacitors of the charge-storage capacitor bank nor on the accuracy of the ratio factor of the resistors of the voltage-scale resistive ladder network. Further, the converter comprises a charge-storage capacitor bank, a voltage-scale resistive ladder network, first and second comparators, an output stage amplifier, and an arrangement of electronically controlled switches and capacitors that cancel the DC offset conditions within the analog-to-digital converter in such a way that the DC offset conditions do not jeopardize the accuracy of the converter. |
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DETAILED DESCRIPTION It is, therefore, a principal object of the present invention to provide an analog-to-digital converter that is substantially immuned to device DC offset voltage, clock feedthrough, channel charge error, common-mode noise, and switch leakage current; as well as to provide an analog-to-digital converter having high gain accuracy, compensation for DC offset conditions, desired monotonicity, high differential linearity and high integral linearity.
Another object of the present invention is to provide an analog-to-digital converter comprising monolithic capacitors and resistors, each having an interrelated ratio matching factor that provides for good monotonicity, whereby the output of the analog-to-digital converter closely follows its input.
It is another object of the present invention to provide for an analog-to-digital converter having a ten-bit capability in which the most significant bit (MSB), serving as a sign for the applied input signal, is detected by a circuit arrangement comprising a plurality of resistors and capacitors and that is not susceptible to resistor or capacitor mismatches and is not dependent on device matching that commonly causes an inaccuracy in the MSB determination.
Other objects of the present invention, as well as advantages thereof over existing prior art forms, will be apparent in view of the following description accompanied by means hereinafter described and claimed.
In general, the converter of the present invention converts an analog signal, herein termed VIN, into a digital representation having a most-significant bit (MSB), upper-signficant bits (USBs), lower-significant bits (LSBs), and with the lower significant bit (LSB) having a predetermined incremental voltage value.
The converter is responsive to external control signals, such as herein termed "TSS1 and TSS2," and is adapted to have applied thereto a supply voltage, such as herein termed "VDA.
" The converter comprises capacitors and resistors, each preferably of the monolithic type, arranged so as to allow a relatively wide ratio matching factor, yet still providing for an accurate analog-to-digital conversion of the applied signal
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