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US 9,768,798 B2Granted
Delta-sigma modulator and method for signal conversion
AssigneeAms AG
InventorsThomas Christen, Thomas Froehlich, Andreas Fitzi, Dusan Prelog
Life of this patent
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Abstract
A delta-sigma modulator (10) comprises a modulator loop (11) and a code generator (12). The modulator loop (11) comprises a loop filter (18). The code generator (12) is configured to generate a generator signal (BS) that is realized as an extended Barker code. The code generator (12) comprises a generator output (23) that is coupled to the loop filter (18).
Claims10
A delta-sigma modulator, comprising:
- a modulator loop comprising a loop filter;
- and
- a code generator that is configured to generate a generator signal that is realized as an extended Barker code, wherein the code generator comprises a generator output,
- wherein the modulator loop comprises
- a modulator input for receiving an input signal,
- a modulator output for providing an output signal of the delta-sigma modulator,
- an adder with a first adder input coupled to the modulator input, a second adder input coupled to the modulator output and an adder output coupled to an input of the loop-filter, and
- a quantizer with an input coupled to a loop filter output of the loop-filter and an output coupled to the modulator output,
- wherein a code adder of the modulator loop comprises
- a first input that is coupled to the loop filter output,
- a second input that is coupled to the generator output and
- an output that is coupled to the input of the quantizer,
- or the loop filter comprises more than one stage and comprises a further input that is coupled to the generator output and to a node between two stages of the loop filter,
- wherein the extended Barker code comprises a code out of
- a Barker code set comprising the code [1 −1], the code [1 1], the code [1 1 −1], the code [1 −1 1 1], the code [1 −1 −1 −1], the code [1 1 1 −1 1], the code [1 1 1 −1 −1 1 −1], the code [1 1 1 −1 −1 −1 1 −1 −1 1 −1] and the code [1 1 1 1 1 −1 −1 1 1 −1 1 −1 1], or
- a reversed code, a negated code or a reversed and negated code of a code of the Barker code set, or
- a code achieved by adding a bit [1] or [−1] to one of the codes comprised by the Barker code set or to the reversed code, the negated code or the reversed and negated code of a code of the Barker code set or
- a compound Barker code realized by a combination of said codes.
15 more elements
A delta-sigma modulator, comprising:
- a modulator loop comprising a loop filter;
- and
- a code generator that is configured to generate a generator signal that is realized as an extended Barker code and wherein the code generator comprises a generator output,
- wherein the modulator loop comprises
- a modulator input for receiving an input signal,
- a modulator output for providing an output signal of the delta-sigma modulator,
- an adder with a first adder input coupled to the modulator input, a second adder input coupled to the modulator output and an adder output coupled to an input of the loop-filter, and
- a quantizer with an input coupled to a loop filter output of the loop-filter and an output coupled to the modulator output,
- wherein a code adder of the modulator loop comprises
- a first input that is coupled to the loop filter output,
- a second input that is coupled to the generator output and
- an output that is coupled to the input of the quantizer,
- or the loop filter comprises more than one stage and comprises a further input that is coupled to the generator output and to a node between two stages of the loop filter,
- wherein the generator signal is
- a constant signal when the input signal and/or the output signal is higher than a predetermined value, and
- the extended Barker code when the input signal and/or the output signal is less or equal than the predetermined value.
13 more elements
A method for signal conversion, comprising:
- performing a delta-sigma modulation by a modulator loop of a delta-sigma modulator, wherein the modulator loop comprises a loop filter;
- generating a generator signal that is an extended Barker code by a code generator;
- and
- providing the generator signal to the modulator loop,
- wherein the loop filter comprises more than one stage and the generator signal is provided to a further input of the loop-filter that is coupled to a node between two stages of the loop filter
- or the generator signal is provided to a second input of a code adder of the modulator loop, wherein a first input of the code adder is coupled to a loop-filter output of the loop-filter,
- wherein the extended Barker code comprises a code out of
- a Barker code set comprising the code [1 −1], the code [1 1], the code [1 1 −1], the code [1 −1 1 1], the code [1 −1 −1 −1], the code [1 1 1 −1 1], the code [1 1 1 −1 −1 1 −1], the code [1 1 1 −1 −1 −1 1 −1 −1 1 −1], the code [1 1 1 1 1 −1 −1 1 1 −1 1 −1 1], or
- a reversed code, a negated code or a reversed and negated code of a code of the Barker code set, or
- a code achieved by adding an bit [1] or [−1] to one of the codes comprised by the Barker code set or to the reversed code, the negated code or the reversed and negated code of a code of the Barker code set or
- a compound Barker code realized by a combination of said codes.
8 more elements
A microphone arrangement, comprising a first and a second microphone, wherein the first microphone comprises a first transducer and a first read-out circuit comprising a first delta-sigma modulator such that the first transducer is coupled via the first read-out circuit to a first data output of the first microphone and
- wherein the second microphone comprises a second transducer and a second read-out circuit comprising a second delta-sigma modulator such that the second transducer is coupled via the second read-out circuit to a second data output of the second microphone,
- wherein the first and the second delta-sigma modulator each comprises:
- a modulator loop comprising a loop filter, and
- a code generator that is configured to generate a generator signal that is realized as an extended Barker code,
- wherein the code generator comprises a generator output that is coupled to the loop filter, and
- wherein the extended Barker code of the first delta-sigma modulator is shifted in phase with respect to the extended Barker code of the second delta-sigma modulator.
3 more elements
A delta-sigma modulator, comprising:
- a modulator loop comprising a loop filter;
- and
- a code generator that is configured to generate a generator signal that is realized as an extended Barker code and wherein the code generator comprises a generator output that is coupled to the loop filter,
- wherein the extended Barker code comprises a code out of
- a Barker code set comprising the code [1 −1], the code [1 1], the code [1 1 −1], the code [1 −1 1 1], the code [1 −1 −1 −1], the code [1 1 1 −1 1], the code [1 1 1 −1 −1 1 −1], the code [1 1 1 −1 −1 −1 1 −1 −1 1 −1] and the code [1 1 1 1 1 −1 −1 1 1 −1 1 −1 1], or
- a reversed code, a negated code or a reversed and negated code of a code of the Barker code set, or
- a code achieved by adding a bit [1] or [−1] to one of the codes comprised by the Barker code set or to the reversed code, the negated code or the reversed and negated code of a code of the Barker code set or
- a compound Barker code realized by a combination of said codes.
5 more elements
Dependencies are inferred from the claim text.