Circuit arrangement for processing, transmitting, and acoustically reproducing digitized audio-frequency signals

• US 4,621,374 A
• Filed: 12/08/1982
• Issued: 11/04/1986
• Est. Priority Date: 12/24/1981
• Status: Expired due to Term

• Current Assignee: Micronas Semiconductor Holding AG (TDK Corporation)
• Original Assignee: ITT Industries (ITT, Inc.)
• Inventors: Zaehringer, Edmund, Micic, Ljubo
• Primary Examiner(s): Orsino, Jr., Joseph A.
• Application Number:
  US06/447,903
• Time in Patent Office: 1,427 Days
• Field of Search: 455/603, 455/617, 455/618, 455/608, 371/37, 360/32, 370/110.1, 370/110.4, 370/111, 358/194.1, 381/2, 381/3, 381/4, 381/77, 381/80, 381/82, 381/105
• US Class Current: 398/106
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04R 2201/028 Structural combinations of loudspeakers with built-in power amplifiers, e.g. in the same acoustic enclosure H04R2499/10 takes precedence; Single (sub)woofer with two or more satellite loudspeakers for mid- and high-frequency band reproduction driven via the (sub)woofer H04R2205/026
• CPC Class Codes: H04R 2420/07 Applications of wireless loudspeakers or wireless microphones
• CPC Class Codes: H04R 27/00 Public address systems circuits for preventing acoustic reaction H04R3/02; circuits for distributing signals to loudspeakers H04R3/12; monitoring or testing arrangements for public address systems H04R29/007; amplifiers H03F
• CPC Class Codes: H04R 3/12 for distributing signals to two or more loudspeakers specially adapted for hearing aids H04R25/407
• CPC Class Codes: H04R 5/02 Spatial or constructional arrangements of loudspeakers

Abstract

Digitized audio-frequency signals are processed in a signal processor (SP) together with digital control signals and pass through a wireless infrared transmission link (I) whose receiver (E) and a following power amplifier (V) are incorporated in a loudspeaker box (B). The audio-frequency signals are coded in a protected code and are fed first to a code-conversion/error-correction processor (CP), then to the signal processor (SP), and then to an RF modulator (M) which drives the transmitter (S) of the transmission link (I).

In a modification, the code-conversion/error-correction processor (CP) and the signal processor (SP) are disposed within the loudspeaker box (B'"'"'), so that errors arising on the transmission link (I) can be compensated for.

Claims

1. Apparatus for processing digitized audio frequency signals together with digital control signals, said digitized audio frquency signals being coded in a protected code, said apparatus comprising:

a code processor receiving said digitized audio frequency signals, performing error correction and converting said digitized audio frequency signals to a non-redundant code to provide digital output signals at an output;

a signal processor receiving said digital output signals and said digital control signals, said signal processor combining said digital output signals with said digital control signals to provide serial digital output signals;

an RF modulator having an input receiving said serial digital output signals;

an infrared transmitter driven by said RF modulator;

an infrared receiver coupled to said infrared transmitter by a wireless link;

an RF demodulator coupled to the output of said receiver;

a digital to analog converter coupled to the output to said RF demodulator;

a power amplifier coupled to the analog output of said converter; and

a loudspeaker driven by said power amplifier.

2. Apparatus in accordance with claim 1, wherein:

said digital audio frequency signals are received from a digital disk and said protected code is a Cross Interleave Reed Solomon code (CIR code).

3. Apparatus in accordance with claim 1 further comprising:

a multiplexer disposed between said code processor and said signal processor, said multiplexer having first inputs for receiving said digital output signals and having second inputs for receiving second digital output signals representative of audio signals.

4. Apparatus in accordance with claim 3, wherein:

said digital audio frequency signals are received from a digital disk and said protected code is a Cross Interleave Reed Solomon code (CIR code).

5. Apparatus in accordance with claim 3, wherein said second digital output signals are generated by an analog to digital converter having its analog inputs coupled to an audio frequency signal source.

6. Apparatus in accordance with claim 5, wherein:

said digital audio frequency signals are received from a digital disk and said protected code is a Cross Interleave Reed Solomon code (CIR code).

7. Apparatus in accordance with claim 5, wherein:

said infrared receiver, said RF demodulator, said digital to analog converter, said power amplifier and said loudspeaker are in a first loudspeaker box; and

said second infrared receiver, said second RF demodulator, said second digital to analog converter, said second power amplifier and said second loudspeaker are in a second loudspeaker box.

8. Apparatus in accordance with claim 7, wherein:

said digital audio frequency signals are received from a digital disk and said protected code is a Cross Interleave Reed Solomon code (CIR code).

9. Apparatus in accordance with claim 3, further comprising:

at least a second infrared receiver coupled to said infrared transmitter by a wireless link;

a second RF demodulator coupled to the output of said second receiver;

a second digital to analog converter coupled to the output of said second RF demodulator;

a second power amplifier coupled to the analog output of said second converter;

and a second loudspeaker driven by said second power amplifier.

10. Apparatus in accordance with claim 9 wherein:

said digital audio frequency signals are received from a digital disk and said protected code is a Cross Interleave Reed Solomon code (CIR code).

11. Apparatus in accordance with claim 9, wherein:

said infrared receiver, said RF demodulator, said digital to analog converter, said power amplifier and said loudspeaker are in a first loudspeaker box; and

said second infrared receiver, said second RF demodulator, said second digital to analog converter, said second power amplifier and said second loudspeaker are in a second loudspeaker box.

12. Apparatus in accordance with claim 11, wherein:

said digital audio frequency signals are received from a digital disk and said protected code is a Cross Interleave Reed Solomon code (CIR code).

13. Apparatus in accordance with claim 11, wherein each of said first and second loudspeaker boxes is assigned its own carrier frequency of said RF modulator.

14. Apparatus in accordance with claim 11, wherein:

said digital audio frequency signals are received from a digital disk and said protected code is a Cross Interleave Reed Solomon code (CIR code).

15. Apparatus for processing, transmitting and acoustically reproducing digitized audio frequency signals together with digital control signals, said digitized audio frequency signals and said digitized control signals being coded in a protected code, said arrangement comprising:

an RF modulator combining said digitized audio frequency signals and said digital control signals and providing modulation signals;

an infrared transmitter driven by said RF modulator;

an infrared receiver coupled to said infrared transmitter by a wireless link;

an RF demodulator coupled to the output of said receiver;

a code processor coupled to the output of said RF demodulator for performing error correction and converting the output signals of said RF demodulator into output digital audio signals and output digital control signals both encoded in a nonredundant code;

a signal processor receiving said digital audio signals and said output digital control signals and operating on said output digital audio signals in accordance with said output digital control signals to provide digital output signals;

a digital to analog converter coupled to said signal processor to convert said digital output signals to analog signals at an output;

a power amplifier coupled to the output of said digital to analog converter; and

a loudspeaker driven by said power amplifier.

16. Apparatus in accordance with claim 15, wherein:

said digital audio frequency signals are received from a digital disk and said protected code is a Cross Interleave Reed Solomon code (CIR code).

17. Apparatus in accordance with claim 15, comprising:

at least a second infrared receiver coupled to said infrared transmitter by a wireless link;

a second RF demodulator coupled to the output of said second receiver;

a second code processor coupled to the output of said second RF demodulator;

a second signal processor coupled to the output of said second code processor;

a second digital to analog converter coupled to the output of said second signal processor;

a second power amplifier coupled to the output of said second digital to analog converter; and

a second loudspeaker driven by said second power amplifier.

18. Apparatus in accordance with claim 17, wherein:

said digital audio frequency signals are received from a digital disk and said protected code is a Cross Interleave Reed Solomon code (CIR code).

19. Apparatus in accordance with claim 15 wherein:

said infrared receiver, said RF demodulator, said code processor, said signal processor, said digital to analog converter, said power amplifier and said loudspeaker are all contained in a loudspeaker box.

20. Apparatus in accordance with claim 19, wherein:

said digital audio frequency signals are received from a digital disk and said protected code is a Cross Interleave Reed Solomon code (CIR code).

21. Apparatus in accordance with claim 19, comprising:

at least a second infrared receiver coupled to said infrared transmitter by a wireless link;

a second RF demodulator coupled to the output of said second receiver;

a second code processor coupled to the output of said second RF demodulator;

a second signal processor coupled to the output of said second code processor;

a second digital to analog converter coupled to the output of said second signal processor;

a second power amplifier coupled to the output of said second digital to analog converter; and

a second loudspeaker driven by said second power amplifier.

22. Apparatus in accordance with claim 21, wherein:

said digital audio frequency signals are received from a digital disk and said protected code is a Cross Interleave Reed Solomon code (CIR code).

23. Apparatus in accordance with claim 21, wherein:

said second infrared receiver, said second RF demodulator, said second code processor, said second signal processor, said second digital to analog converter, said second power amplifier, and said second loudspeaker are contained in a second loudspeaker box.

24. Apparatus in accordance with claim 23, wherein each of said first and second loudspeaker boxes is assigned its own carrier frequency of said RF modulator.

25. Apparatus in accordance with claim 23, wherein:

said digital audio frequency signals are received from a digital disk and said protected code is a Cross Interleave Reed Solomon code (CIR code).

26. Apparatus in accordance with claim 23, wherein said digital control signals include first digital control signals for said signal processor and second digital control signals for said second signal processor.

27. Apparatus for processing first digitized audio frequency signals together with digital control signals, said first digitized audio frequency signals and said digital control signals being coded in a protected code said arrangement comprising:

a multiplexer for multiplexing said first digitized audio frequency signals with other digital audio frequency signals to provide second digitized audio frequency signals;

an RF modulator combining said second digitized audio frequency signals and said digital control signals and providing modulation signals;

an infrared transmitter driven by said RF modulator;

an infrared receiver coupled to said infrared transmitter by a wireless link;

an RF demodulator coupled to the output of said receiver;

a code processor coupled to the output of said RF demodulator for performing error correction and converting the output signals of said RF demodulator into output digital audio signals and output digital control signals both encoded in a non redundant code;

a signals processor receiving said digital audio signals and said output digital control signals and operating on said digital audio signals in accordance with said output digital control signals to provide digital output signals;

a digital to analog converter coupled to said signal processor to convert said digital output signals to analog signals at an output;

a power amplifier coupled to the output of said digital to analog converter; and

a loudspeaker driven by said power amplifier.

28. Apparatus in accordance with claim 27, wherein:

said digital audio frequency signals are received from a digital disk and said protected code is a Cross Interleave Reed Solomon code (CIR code).

29. Apparatus in accordance with claim 27, wherein each of said first and second loudspeaker boxes is assigned its own carrier frequency of said RF modulator.

30. Apparatus in accordance with claim 29, wherein:

said digital audio frequency signals are received from a digital disk and said protected code is a Cross Interleave Reed Solomon code (CIR code).

31. Apparatus in accordance with claim 27 wherein:

said infrared receiver, said RF demodulator, said code processor, said signal processor, said digital to analog converter, said power amplifier and said loudspeaker are all contained in a loudspeaker box.

32. Apparatus in accordance with claim 31, wherein:

said digital audio frequency signals are received from a digital disk and said protected code is a Cross Interleave Reed Solomon code (CIR code).

33. Apparatus in accordance with claim 31, comprising:

at least a second infrared receiver coupled to said infrared transmitter by a wireless link;

a second RF demodulator coupled to the output of said second receiver;

a second code processor coupled to the output of said second RF demodulator;

a second signal processor coupled to the output of said second code processor;

a second digital to analog converter coupled to the output of said second signal processor;

a second power amplifier coupled to the output of said second digital to analog converter; and

a second loudspeaker driven by said second power amplifier.

34. Apparatus in accordance with claim 33, wherein:

said digital audio frequency signals are received from a digital disk and said protected code is a Cross Interleave Reed Solomon code (CIR code).

35. Apparatus in accordance with claim 33, wherein:

said second infrared received, said second RF demodulator, said second code processor, said second signal processor, said second digital to analog converter, said second power amplifier, and said second loudspeaker are container in a second loudspeaker box.

36. Apparatus in accordance with claim 35, wherein:

said digital audio frequency signals are received from a digital disk and said protected code is a Cross Interleave Reed Solomon code (CIR code).