Signal mixing apparatus for processing parallel digital data on a time shared basis using analog addition
AssigneeYamaha Corporation
InventorHiroshi Hamamatsu
Life of this patent
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Abstract
A signal mixing apparatus utilizing digital signal processing technology for mixing digital signals comprising parallel data of plural channels include an analog addition circuit for adding, in analog, data of the same bit of parallel input data in plural channels, an analog-to-digital conversion circuit for converting added analog data of respective bits to digital data, and a digital addition circuit for adding, in digital, the converted digital data of all bits together. Since the data of the same bit of parallel input data of plural channels are added together in analog through the analog addition circuit such as a bus and an analog adder, digital input data of a large number of channels can be mixed together with a small amount of wiring.
Claims12
A signal mixing apparatus utilizing digital signal processing technology comprising:
- input means for inputting digital signals as a plurality of parallel data bits within each of a plurality of channels;
- analog addition means for adding, in analog, data of the same one of the plurality of parallel data bits within each of the plurality of channels to produce an analog sum for each of the plurality of parallel data bits;
- analog-to-digital conversion means for converting the analog sum for each of the plurality of parallel data bits to digital data;
- and
- digital addition means for adding, in digital, the converted analog sums for all of the plurality of parallel data together to produce a single sum and outputting the single sum.
A signal mixing apparatus utilizing digital signal processing technology comprising:
- a plurality of channel module portions, each inputting digital signals consisting of a plurality of different parallel data bits and providing signals corresponding to the parallel data bits;
- and
- a master module portion connected to the plurality of channel module portions and comprising:
- analog addition means for adding, in analog, data of the same one of the plurality of parallel data bits from each of said plurality of channel module portions to produce an analog sum for each of the plurality of parallel data bits;
- analog-to-digital conversion means for converting the analog sum for each of the plurality of parallel data bits to digital data;
- and
- digital addition means for adding, in digital, the converted analog sums for all of the plurality of parallel data together to produce a single sum and outputting the single sum.
A signal mixing apparatus comprising:
- a plurality of channels;
- a plurality of channel modules connected to the plurality of channels, each channel module comprising input means for inputting digital parallel data from one of the plurality of channels, and conversion means for converting respective bit data of the digital parallel data into a plurality of analog signals, the plurality of analog signals respectively representing bit data of the plurality of digital parallel data;
- a master module connected to said plurality of channel modules and comprising a plurality of bit addition devices, each bit addition device having analog addition means for respectively inputting analog signals corresponding to a same bit from the plurality of channel modules and for mixing input signals, and analog-to-digital conversion means for converting mixed signals from said addition means into digital signals;
- and
- digital addition means for inputting a plurality of digital data from the plurality of bit addition devices, for bit-matching the plurality of digital data and for adding a plurality of bit-matched digital data.
Dependencies are inferred from the claim text.