Electronic equipment synchronously controlling light emission from light emitting devices and audio control

• US 20050217457A1
• Filed: 03/29/2005
• Published: 10/06/2005
• Est. Priority Date: 03/30/2004
• Status: Active Grant

• Current Assignee: ROHM Co., Ltd.
• Original Assignee: ROHM Co., Ltd.
• Inventors: Yamamoto, Isao, Miyanaga, Koichi
• Granted Patent: US 7,754,960 B2
• Time in Patent Office: Days
• US Class Current: 84/464.R
• CPC Class Codes: A63J 17/00 Apparatus for performing colour-music

Abstract

Electronic equipment includes a processing unit which controls light emission from LEDs by referring to music data described in a music file such as a MIDI file. The processing unit controls light emission from the LEDs by detecting the occurrence of sound described in the music file. Light emission from the LEDs may be controlled in accordance with tone data and/or a track number included in the music file. Alternatively, light emission from the LEDs may be controlled in accordance with volume data.

Claims

1. Electronic equipment comprising:

a light emitting device;

an audio output unit which outputs audio by referring to a music file describing music data; and

a control unit which detects the occurrence of sound by analyzing the music file and controls light emission from the light emitting device.

2. The electronic equipment according to claim 1, wherein the control unit controls light emission from the light emitting device in accordance with tone data included in the music file.

3. The electronic equipment according to claim 1, wherein the control unit controls light emission from the light emitting device in accordance with a track number included in the music file.

4. The electronic equipment according to claim 1, wherein the control unit controls light emission from the light emitting device in accordance with volume data included in the music file.

5. The electronic equipment according to claim 2, wherein the control unit controls light emission from the light emitting device in accordance with volume data included in the music file.

6. The electronic equipment according to claim 3, wherein the control unit controls light emission from the light emitting device in accordance with volume data included in the music file.

7. The electronic equipment according to claim 1, wherein there are provided a plurality of light emitting devices emitting respective colors, and the control unit regulates quantity of light emitted in the respective colors.

9. The electronic equipment according to claim 1, wherein the control unit comprises:

a constant current circuit connected to the light emitting device in series;

a switch element which turns a current generated by the constant current circuit on and off; and

a pulse width modulation circuit which subjects on and of time of the switch element to pulse width modulation.

11. The electronic equipment according to claim 9, wherein the constant current circuit comprises:

a transistor;

a resistor which has its one end grounded and the other end connected to the transistor; and

an operational amplifier which has its output terminal connected to a control terminal of the transistor, its non-inverting input fed a reference voltage and its inverting input fed a feedback input of a voltage occurring at the other end of the resistor.

13. The electronic equipment according to claim 9, wherein the switch element is provided between the control terminal of the transistor and a ground potential.

15. The electronic equipment according to claim 1, further comprising a boost circuit which supplies a drive voltage to the light emitting device.

17. The electronic equipment according to claim 1, wherein the light emitting device is a light emitting diode.

19. The electronic equipment according to claim 1, wherein the music file is described according to the MIDI standard.

8. Electronic equipment comprising:

a light emitting device;

an audio output unit which outputs audio by referring to a music file describing music data; and

a control unit which controls light emission from the light emitting device using a result of pre-processing the music file for audio output from the audio output unit.

10. The electronic equipment according to claim 8, wherein the control unit comprises:

a constant current circuit connected to the light emitting device in series;

a switch element which turns a current generated by the constant current circuit on and off; and

a pulse width modulation circuit which subjects on and of time of the switch element to pulse width modulation.

12. The electronic equipment according to claim 10, wherein the constant current circuit comprises:

a transistor;

a resistor which has its one end grounded and the other end connected to the transistor; and

an operational amplifier which has its output terminal connected to a control terminal of the transistor, its non-inverting input fed a reference voltage and its inverting input fed a feedback input of a voltage occurring at the other end of the resistor.

14. The electronic equipment according to claim 10, wherein the switch element is provided between the control terminal of the transistor and a ground potential.

16. The electronic equipment according to claim 8, further comprising a boost circuit which supplies a drive voltage to the light emitting device.

18. The electronic equipment according to claim 8, wherein the light emitting device is a light emitting diode.

20. The electronic equipment according to claim 8, wherein the music file is described according to the MIDI standard.

21. Electronic equipment comprising:

a matrix array of a plurality of scan lines and a plurality of data lines;

a matrix array of a plurality of light emitting devices provided at intersections of the plurality of scan lines and the plurality of data lines;

a drive voltage supplying unit which supplies a drive voltage to the plurality of scan lines;

a plurality of constant current circuits each of which is provided for a corresponding one of the plurality of data lines and which generates a constant current to feed through the light emitting device connected to the corresponding data line;

a plurality of switch elements each of which is provided for a corresponding one of the plurality of constant current circuits and which subjects the current generated by the corresponding constant current circuit to pulse width modulation control;

an audio output unit which outputs audio by referring to a music file describing music data; and

a control unit which detects the occurrence of sound by analyzing the music file and controls on and off the plurality of switch elements by pulse width modulation.