Circuit for converting a staircase waveform into a smoothed analog signal
First Claim
1. A circuit for converting an input staircase waveform signal (e.g., Σ
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1) with a regular stepping time interval but different stepping heights into a smoothed analog signal (e.g., ε
) comprising;
a delay unit for delaying said input staircase signal for one said stepping interval,means for producing a differential signal (e.g., Δ
) by taking the difference between said input staircase signal and said one stepping interval delayed version (e.g., Σ
3) thereof,means for integrating said differential signal with respect to time at every stepping interval to produce a sawtoothwave signal (e.g., γ
) with substantially linear slopes, andmeans for additively combining said sawtoothwave signal with said one stepping interval delayed version.
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Abstract
In converting a staircase waveform signal into a smoothed analog signal, this circuit can perform the high-quality conversion without any sophisticated lowpass filter. An input staircase signal is delayed for one stepping interval to produce a differential signal which represents a stepping height at each step, by taking the difference between the input staircase signal and the one stepping interval delayed version thereof. The differential signal is integrated at every stepping interval. The integrated voltage forms a sawtooth wave signal which is in turn additively combined with the one stepping interval delayed version of the input staircase signal. The resulted combined signal is a smoothed signal of the input staircase signal.
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Citations
4 Claims
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1. A circuit for converting an input staircase waveform signal (e.g., Σ
-
1) with a regular stepping time interval but different stepping heights into a smoothed analog signal (e.g., ε
) comprising;a delay unit for delaying said input staircase signal for one said stepping interval, means for producing a differential signal (e.g., Δ
) by taking the difference between said input staircase signal and said one stepping interval delayed version (e.g., Σ
3) thereof,means for integrating said differential signal with respect to time at every stepping interval to produce a sawtoothwave signal (e.g., γ
) with substantially linear slopes, andmeans for additively combining said sawtoothwave signal with said one stepping interval delayed version. - View Dependent Claims (2)
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1) with a regular stepping time interval but different stepping heights into a smoothed analog signal (e.g., ε
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3. An FM stereo demodulator for a left and right channel signal amplitude-modulated subcarrier including left and right channel units, each channel unit comprising:
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means for producing a staircase waveform (e.g., Σ
1) of the channel signal by sample-holding said amplitude-modulated subcarrier (e.g., φ
) at sampling intervals in phase with or in reverse phase with the subcarrier period,a delay unit for receiving said staircase signal and delaying it for one said sampling interval (e.g, Ts), means for producing a differential signal (e.g., Δ
) by taking the difference between said staircase signal (e.g., Σ
1) and said one sampling interval delayed version (e.g., Σ
3) thereof,means for integrating said differential signal with respect to time at every sampling interval to produce a sawtoothwave signal (e.g., γ
) with substantially linear slopes, andmeans for additively combining said sawtoothwave signal with said one sampling interval delayed version to demodulate the channel signal. - View Dependent Claims (4)
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Specification
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- Resources
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Current AssigneeTRIO Kabushiki Kaisha
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Original AssigneeTRIO Kabushiki Kaisha
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InventorsOgawa, Atsushi
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Primary Examiner(s)Laroche, Eugene R.
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Assistant Examiner(s)Pascal, Robert J.
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Application NumberUS06/407,601Time in Patent Office1,006 DaysField of Search329/50, 329/109, 329/126, 329/145, 381/4, 381/7, 328/27, 328/35, 307/261US Class Current329/348CPC Class CodesH03D 1/2227 using switches for the deco...
