Signal processing device

• US 4,409,669 A
• Filed: 09/12/1980
• Issued: 10/11/1983
• Est. Priority Date: 09/12/1980
• Status: Expired due to Term

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Neumann, Leopold, Kline, Richard B. II
• Primary Examiner(s): Springborn, Harvey E.
• Application Number:
  US06/186,763
• Time in Patent Office: 1,124 Days
• Field of Search: 364/200 MS File, 364/900 MS File, 340/347 R, 340/870.09, 340/870.11, 340/825.34
• US Class Current: 712/36
• CPC Class Codes: G16H 40/40 for the management of medical equipment or devices, e.g. scheduling maintenance or upgrades
• CPC Class Codes: G16H 40/63 for local operation

Abstract

A signal processing apparatus comprises a main unit having a frame, and a plurality of modules for processing analog signals replaceably inserted into said frame. Each of the modules has an analog-to-digital converter for the analog signals and an identification signal generator which generates a module identification signal different for each module. The main unit comprises a signal processing system and a conversion pulse clock generator. The latter one clocks each analog-to-digital converter in each module to convert analog signals to digital data. The digital data are transmitted together with the module identification signal to the signal processing system.

Claims

1. A signal processing apparatus comprising:

(1) a main unit having

(a) a frame;

(b) a signal processing means located in said frame;

(c) a conversion pulse clock generator of predetermined clock frequency located in said frame and having an output for conversion pulses;

(2) a plurality of modules replaceably inserted into said frame of said main unit, each of said modules having

(a) a module input for analog signals;

(b) a module output connectable with said signal processing means of said main unit;

(c) an analog-to-digital converter connected between said module input and said module output for converting said analog signals into digital output data, which analog-to-digital converter comprises a conversion clock input connectable with said output of said conversion pulse clock generator of said main unit;

(d) an identification signal generator connected to said module output for generating a module identification signal in form of a sequence of digital pulses which module identification signal is different from each module;

wherein said conversing pulse clock generator in said main unit is provided for clocking each of said analog-to-digital converters of said replaceable modules with said conversion pulses for the execution of convertions of said analog signals in a fixed sequence, regardless of the relative spatial correlation in which said modules are inserted into said main frame, said analog-to-digital converters thereupon generating said digital output data from said analog input signals for being transmitted to said signal processing means in said main unit, and wherein said identification signals of said identification signal generators are provided for being transmitted together with said digital output data of said analog-to-digital convertors to said signal processing means in said main unit, and wherein each of said replaceable modules comprises a plurality of signal channels connected to said module input and a plurality of switches, said switches connecting said signal channels to said analog-to-digital converter for the purpose of executing analog-to-digital conversion with respect to said analog signals, and wherein said conversion pulse clock generator supplies a train of said conversion pulses which clock each of said analog-to-digital converters for the executions of conversions in said fixed sequence, and a train of switching pulses which actuate said switches in the sense that said individual signal channels are connected to and disconnected from said analog-to-digital converter in a predetermined sequence which sequence is fixed, and wherein said signal channels are assigned to signals of different bandwidths, and wherein said switches connected to said signal channels are supplied with switching pulses of different switching frequencies such that a signal channel with a higher bandwidth is scanned more often than of signal channel with a lower bandwidth.

2. The signal processing apparatus according to claim 1, wherein all said replaceable modules contain a first signal channel for signals in a first frequency range and a second signal channel for signals in a second frequency range, wherein said first frequency range has lower frequencies with respect to said second frequency range.

3. The signal processing apparatus according to claim 2, wherein one of said replaceable modules additionally contains a third channel for signals in a third frequency range, wherein said third frequency range has higher frequencies with respect to said second freqency range.

4. The signal processing apparatus according to claim 3, wherein four replaceable modules are provided, and wherein said switches are actuated by said train of switching pulses of said conversion pulse clock generator with the following sequence:

1H, 1A, 1H, 2A, 1H, 3A, 1H, 4A, 1H, 1B, 1H, 2B,

1H, 1A, 1H, 2A, 1H, 3A, 1H, 4A, 1H, 3B, 1H, 4B,

the numerals 1, 2, 3 and 4 identifying herein the number of a particular module considered, and the letters A, B, and H identifying herein the channels for signals in said second, first and third frequency range respectively.

5. A signal processing apparatus comprising:

(1) a main unit having

(a) a frame;

(b) a signal processing means located in said frame;

(c) a conversion pulse clock generator of predetermined clock frequency located in said frame and having an output for conversion pulses;

(2) a plurality of modules replaceably inserted into said frame of said main unit, each of said modules having

(a) an module input for analog signals;

(b) a module output connectable with said signal processing means of said main unit;

(c) an analog-to-digital converter connected between said module input and said module output for converting said analog signals into digital output data, which analog-to-digital converter comprises a conversion clock input connectable with said output of said conversion pulse clock generator of said main unit;

(d) an identification signal generator connected to said module output for generating a module identification signal in form of a sequence of digital pulses which module identification signal is different for each module;

wherein said conversion pulse clock generator in said main unit is provided for clocking each of said analog-to-digital converters of said replaceable modules with said conversion pulses for the execution of conversions of said analog signals in a fixed sequence, regardless of the relative spatial correlation in which said modules are inserted into said main frame, said analog-to-digital converters thereupon generating said digital output data from said analog input signals for being transmitted to said signal processing means in said main unit, and wherein said identification signals of said identification signal generators are provided for being transmitted together with said digital output data of said analog-to-digital convertors to said signal processing means in said main unit.

6. The signal processing apparatus according to claim 5, wherein each of said replaceable modules comprises a plurality of signal channels connected to said module input and a plurality of switches, said switches connecting said signal channels to said analog-to-digital converter for the purpose of executing analog-to-digital conversion with respect to said analog signals, and wherein said conversion pulse clock generator supplies

(a) a train of said conversion pulses which clock each of said analog-to-digital converters for the executions of conversions in said fixed sequence, and

(b) a train of switching pulses which actuate said switches in the sense that said individual signal channels are connected to and disconnected from said analog-to-digital converter in a predetermined sequence which sequence is fixed.

7. The signal processing apparatus according to claim 6, wherein first means are provided for producing a configuration word and second means for transmitting said pulses of said configuration word in an intermixed manner with said conversion pulses of said conversion pulse clock generator to said replaceable modules, wherein said configuration word comprises

(a) said train of switching pulses for actuating said switches in said channels of each of said modules;

and

(b) control pulses for adjustable and indicating means incorporated in each of said modules, such as adjustable amplifiers and filters and indicating keys.

8. The signal processing apparatus according to claim 7, wherein each of said modules further comprises a first and a second storage unit connected to said conversion clock input of said analog-to-digital converter and wherein each configuration word transmitted to said modules is first stored in said first storage unit and shifted to said second storage unit at the occurrence of the next following configuration word, such that said configuration word stored in said first storage unit with respect to said configuration word stored in said second storage unit always contains information relating to a next following conversion cycle.

9. The signal processing apparatus according to claim 8, wherein said configuration word is an 8-bit word, and wherein said first storage unit comprises a first 8-bit shift register and wherein said second storage unit comprises a second 8-bit shift register, said first shift register taking over the bits of said configuration word serially and forwarding said bits in parallel formation to said second shift register.

10. The signal processing apparatus according to claim 9, wherein in said 8-bit configuration word at least 2 bits establish said train of switching pulses which actuate said switches in said channels of said modules and the remaining 6 bits represent said control pulses for said adjustable and indicating means incorporated in each of said modules.

11. The signal processing apparatus according to claim 5, wherein said identification signal generator of said module is a shift register having a predetermined number of data inputs, which data inputs are wired in a fixed way for establishing said identification signal, thereby characterizing said module.

12. The signal processing apparatus according to claim 11, wherein said shift register comprises a number of data inputs that establish an auxiliary word, which auxiliary word contains said identification signal characterizing said replaceable module and auxiliary quantities such as information about the state of said replaceable module, said auxiliary word being transmitted together with said converted digital output data of said analog-to-digital converter from said module to said main unit.

13. The signal processing apparatus according to claim 12, wherein said auxiliary quantities comprise command data which are to be transmitted from said replaceable module to said main unit and which are subsequently to be retransmitted from said main unit to said module.

14. The signal processing apparatus according to claim 12, wherein said shift register is an 8-bit shift register having a first and a second set of four data inputs each, said first set of data inputs being wired such that at the output of said shift register an identification word is established as said identification signal, and wherein said second set of data inputs is provided to establish said auxiliary quantities to be transmitted and to be retransmitted.

15. The signal processing apparatus according to claim 5, wherein each of said module outputs and a corresponding number of associating inputs of said signal processing means in said frame of said main unit form together a first non-galvanic signal coupling unit.

16. The signal processing apparatus according to claim 5, wherein each of said conversion clock inputs of said analog-to-digital converters and a corresponding number of outputs in said frame of said main unit, which are connectable with the output of said conversion pulse clock generator, form together a second non-galvanic signal coupling unit.