Multi-path analog-to-digital and digital-to-analog conversion of PDM signals
OwnerJohn Howard La Grouinventor
Life of this patent
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Abstract
An analog-to-digital and digital-to-analog conversion system using pulse-density-modulation (PDM) digital signals which minimize noise and optimize dynamic range by dividing a signal into multiple parallel pathways by apportioning a least significant range portion of an incoming signal to a low-path circuit and a most-significant portion of the incoming signal to a high-path circuit. The high-path circuit and low-path circuit can be separately level-modified to optimize dynamic range. Embodiments of the system can include an analog-to-digital conversion, a digital-to-analog conversion, or a complete analog-to-digital and digital-to-analog conversion system.
Claims28
An apparatus for processing pulse-density modulation (PDM) signals, comprising:
- memory including instructions stored thereon;
- a processor, that in response to execution of the instructions causes the apparatus to:
- synchronously receive a first PDM stream and a second PDM stream, the first PDM stream representing a first signal level range and the second PDM stream representing a second signal level range of a composite signal;
- create a first synthesized pulse-code modulation (PCM) stream of the first PDM stream and a second synthesized PCM stream of the second PDM stream;
- and
- create a transition event between the first PDM stream and the second PDM stream based on a predetermined signal level.
An apparatus for processing pulse-density modulation (PDM) signals, comprising:
- an input analog signal path receiving a dynamically-contiguous analog signal;
- a first gain modification device outputting and noise-optimized for a first signal level range of the dynamically-contiguous analog signal;
- a second gain modification device outputting and noise-optimized for a second signal level range of the dynamically-contiguous analog signal different than the first signal level range, the first gain modification device and the second gain modification device receive the input analog signal path;
- a first PDM analog-to-digital converter (ADC) outputting a first PDM stream representing the first signal level range;
- a second PDM ADC outputting a second PDM stream representing the second signal level range;
- and
- the first PDM stream and the second PDM stream represent separate partial dynamic range portions of the dynamically-contiguous analog signal.
Dependencies are inferred from the claim text.