Audio system for playing back recorded information by remote transmission

• US 20060168641A1
• Filed: 07/22/2005
• Published: 07/27/2006
• Est. Priority Date: 12/09/2004
• Status: Active Grant

• Current Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Original Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Inventors: Niiyama, Tetsuya, Sato, Toshimasa, Miyatsu, Keiji
• Granted Patent: US 7,565,214 B2
• Time in Patent Office: Days
• US Class Current: 725/147
• CPC Class Codes: H04H 20/28 Arrangements for simultaneous broadcast of plural pieces of information
• CPC Class Codes: H04H 20/47 specially adapted for stereophonic broadcast systems
• CPC Class Codes: H04H 20/63 to plural spots in a confined site, e.g. MATV [Master Antenna Television]
• CPC Class Codes: H04H 20/76 Wired systems

Abstract

The present invention is directed to an audio system for playing back recorded information by remote transmission. At the transmitting end of the system, an analog audio signal acquired by a server from a recording medium is first converted into a digital data signal, and then a signal created by superimposing the digital data signal with a stereo signal is transmitted out. At the receiving end, an input circuit receives the superimposed signal transmitted over a cable from the transmitting end, and separates it into the digital data signal and the stereo signal; then, the digital data signal is converted back into the analog audio signal which is output to speakers for stereo playback. As, of the plurality of signals to be transmitted, two signals are combined into one signal for transmission, the number of connecting cables can be reduced.

Claims

1. An audio system for playing back recorded information by remote transmission, comprising:

a transmitting output circuit containing an analog/digital converter for converting an analog audio signal, representing the recorded information acquired by an audio playback server, into a digital data signal, and a superimposing circuit for creating a first superimposed signal from the digital data signal and a stereo signal; and

a receiving input circuit containing a separating circuit for separating the first superimposed signal, transmitted over a first cable from the transmitting output circuit, into the digital data signal and the stereo signal, and a digital/analog conversion circuit for converting the separated digital data signal into analog form, wherein

the receiving input circuit outputs the analog audio signal to an audio output device for playback.

2. An audio system for playing back recorded information by remote transmission as claimed in claim 1, wherein the superimposing circuit creates a second superimposed signal from a system clock signal and a bit clock signal to be used for playback, and

the separating circuit separates the second superimposed signal, transmitted over a second cable from the transmitting output circuit, into the system clock signal and the bit clock signal.

3. An audio system for playing back recorded information by remote transmission as claimed in claim 1, wherein a system clock signal to be used for playback is transmitted from the transmitting output circuit to the receiving input circuit over a second cable.

4. An audio system for playing back recorded information by remote transmission as claimed in claim 1, wherein the superimposing circuit creates the first superimposed signal by performing an addition or a subtraction between the audio signal and the stereo signal.

5. An audio system for playing back recorded information by remote transmission as claimed in claim 2, wherein the first cable and the second cable are each a twisted-pair cable consisting of a pair of conductors.

6. An audio system for playing back recorded information by remote transmission as claimed in claim 2, wherein the superimposing circuit creates the first superimposed signal by performing an addition or a subtraction between the audio signal and the stereo signal.

7. An audio system for playing back recorded information by remote transmission as claimed in claim 3, wherein the first cable and the second cable are each a twisted-pair cable consisting of a pair of conductors.