JP2002279780A - Headphone device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a headphone device which inputs directly a digital voice signal from a digital reproducing device such as a DVD player or the like in which expansion of a digital voice signal is not supported and by which the signal can be listened. SOLUTION: An output of an information reproducing device 100 from which a digital voice signal compressed with at least one format out of PCM, AC3, DTS, MPEG is outputted is imputed, and it is determined by a voice signal determinating section 13 that which format is used to compress an inputted digital voice signal. After the digital voice signal inputted to the information reproducing device 100 is converted to an analog signal using D/A converters 141, 142 based on the result determined by the voice signal determining section 13, a voice signal is listened from loudspeakers 161, 162.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headphone device for reproducing an input digital audio signal.

[0002]

2. Description of the Related Art A conventional headphone device can input only an analog audio signal as shown in FIG.
AC supported by the information reproducing apparatus 31 such as VD
3. Digital audio signals compressed in a format such as DTS (Digital theater system)
Before being supplied to 2, the signal had to be expanded and converted to an analog signal.

For this reason, there is a problem that a headphone device cannot be connected to a DVD player that does not support expansion of the digital audio signal, such as a portable DVD player.

[0004]

Since the conventional headphone device can input only an analog audio signal, the headphone device is connected to a DVD player that does not support expansion of the digital audio signal, such as a portable DVD player. There was a problem that it was not possible.

It is an object of the present invention to provide a headphone device capable of directly inputting and viewing a digital audio signal from a digital playback device such as a DVD player which does not support expansion of the digital audio signal.

[0006]

In order to solve the above-mentioned problems, a headphone device according to the present invention receives an output of an information reproducing apparatus which outputs a compressed digital audio signal and reproduces the digital audio signal. D / A converter for converting the digital audio signal into an analog signal, and an electromechanical converter for reproducing the analog signal converted by the D / A converter as a viewable signal. And characterized by the following.

Also, an output of an information reproducing apparatus which outputs a digital audio signal compressed in a different format is input, and the digital audio signal is reproduced for viewing. Determining means for determining which of the different formats has been compressed; converting means for converting the digital audio signal into an analog signal based on a result determined by the means; and D / A converter And an electromechanical converter for reproducing the converted analog signal.

[0008] Further, an output of an information reproducing apparatus to which an analog audio signal and a digital audio signal compressed in a different format are output is input, and the analog signal or the digital audio signal is reproduced and viewed, Determination means for determining which format of the different format the input digital audio signal is, and conversion means for converting the digital audio signal to an analog signal based on a result determined by the means,
Selecting means for selecting which of the analog signal converted by the converting means and the analog signal received from the information reproducing apparatus is to be viewed.

[0009] By the above means, even if a digital audio signal is directly input from a digital playback device such as a DVD player which does not support expansion of the digital audio signal, it is possible to view.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a system diagram for explaining an embodiment of the present invention. 100 is an information reproducing apparatus such as a DVD player, and 200 is a digital audio signal supplied from the information reproducing apparatus 100. And a headphone body for reproducing as an analog audio signal.

Hereinafter, the headphone main body 200 managed based on the control unit 12 driven by supplying power from the battery unit 11 will be described. The digital audio signal DA is
The information is input to the audio signal determination unit 13 of the headphone body 200 from the information reproducing apparatus 100.

The control section 12 controls the audio signal determination section 13 so that the digital audio signal DA input to the audio signal determination section 13 is converted into a PCM digital signal / AC3 digital bit stream signal / DTS digital bit stream signal / M
It is determined which of the PEG digital bit stream signals is.

If the result of the determination is a PCM digital signal, the control unit 12 sends the PCM digital signal to the D / A converter 141, 1 to the audio signal determination unit 13.
An instruction is issued to input the information to the input terminal 42. The control unit 12
Commands the D / A converters 141 and 142 to perform D / A conversion of the input PCM digital signal. Further, the controller 12 controls the D / A converter 1
41 and 142 are instructed to output the D / A-converted audio signal to the amplifiers 151 and 152. Further, control unit 12 instructs amplifier 151.152 to output the input audio signal to speakers 161 and 162. Further, the control unit 12 includes a speaker 161,
162 is instructed to output sound so that the user can hear it.

Next, when the result of the determination is an AC3 digital bit stream signal, the control unit 12 instructs the audio signal determination unit 13 to input an AC3 signal to an AC3 signal decoding unit 17 for decoding the AC3 digital bit stream signal. Command to do so. Next, the control unit 12 instructs the AC3 signal decoding unit 17 to decode the input AC3 digital bit stream signal and output the PCM digital signal to the D / A converters 141 and 142. Also,
The control unit 12 instructs the D / A converters 141 and 142 to perform D / A conversion of the input PCM digital signal. Further, the control unit 12 controls the D / A
It instructs converters 141 and 142 to output the D / A converted audio signal to amplifiers 151 and 152. Further, the control unit 12 includes amplifiers 151 and 152
In response to the input audio signals, the speakers 161 and 162
To output to. Further, the control unit 12 instructs the speakers 161 and 162 to output sound so that the user can hear the sound.

When the result determined by the headphone body 200 is a DTS digital bit stream signal,
The control unit 12 instructs the audio signal determination unit 12 to input the audio signal to a DTS signal decoding unit 18 that decodes a DTS digital bit stream signal. Next, the control unit 12
It instructs the TS signal decoding unit 18 to decode the input DTS digital bit stream signal and output the PCM digital signal to the D / A converter 7. Further, the control unit 5 instructs the D / A converters 141 and 142 to perform D / A conversion of the input PCM digital signal. Further, the control unit 12 controls the D / A
It instructs converters 141 and 142 to output the D / A converted audio signal to amplifiers 151 and 152. Further, the control unit 12 includes amplifiers 151 and 152
In response, the input audio signal is transmitted to speakers 161, 162
To output. Further, the control unit 12 instructs the speakers 161 and 162 to output sound so that the user can hear the sound.

Next, if the determined result is an MPEG digital bit stream signal, the control unit 12
The audio signal determination unit 13 is instructed to input the MPEG digital bit stream signal to the MPEG signal decoding unit 19. Next, the control unit 5 controls the MPEG signal decoding unit 19
Is instructed to decode the input MPEG digital bit stream signal and output the PCM digital signal to the D / A converters 141 and 142. Further, the control unit 5 instructs the D / A converters 141 and 142 to perform D / A conversion of the input PCM digital signal. Further, the control unit 12 instructs the D / A converters 141 and 142 to output the D / A converted audio signals to the amplifiers 151 and 152. Further, the control unit 12 instructs the amplifiers 151 and 152 to output the input audio signal to the speakers 161 and 162. Further, the control unit 12 instructs the speakers 161 and 162 to output sound so that the user can hear them.

According to this embodiment, the headphone body determines the format of the digital audio supplied from the information reproducing apparatus, and it is possible to view and listen to the audio based on the result. Therefore, even if a digital audio signal is directly input from a digital information reproducing device such as a DVD player that does not support expansion of the digital audio signal, the digital audio signal can be viewed.

FIG. 2 is a circuit configuration diagram for explaining another embodiment of the present invention. In this embodiment, a digital audio signal DA and an analog audio signal AA are supplied from an information reproducing apparatus 100 to a headphone main body 200 so that the headphone main body 200 can reproduce the digital audio signal DA and the analog audio signal AA. Is omitted.

That is, the user operates the operation unit 21 to select which of the digital audio signal DA and the analog audio signal AA output from the information reproducing apparatus 100 is to be reproduced. When the content of the user's command received by the operation unit 21 is a digital audio signal, the control unit 12 sends the digital audio signal to the D / A converters 141 and 142 to the signal selection units 221 and 222. Make a command. When the content of the command received by the operation unit 21 is to select an analog audio signal, the control unit 12 sends the analog audio signal to the D / A converters 141 and 142 to the signal selection units 221 and 222. Give a command to send.

In this manner, the digital audio signal DA and the analog audio signal AA are supplied from the information reproducing apparatus 100 to the headphone main body 200, and the user operates the headphone main body 200 for both the supplied digital audio signal and analog audio signal. Will be available for viewing.

[0022]

As described above, according to the headphone device of the present invention, even when a digital audio signal is directly input from a digital playback device such as a DVD player which does not support expansion of the digital audio signal, viewing and listening are possible. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram for describing an embodiment of the present invention.

FIG. 2 is a circuit configuration diagram for describing another embodiment of the present invention.

FIG. 3 is a circuit diagram for explaining a conventional headphone device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 information reproducing device 200 headphone body 12 control unit 13 audio signal determination unit 141, 142 D / A converter 161, 162 speaker 17 AC3 signal decoding unit 18 DTS signal decoding unit 19 MPEG signal decoding Unit 21 Operation unit 221, 222 Signal selection unit

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Claims (4)

[Claims] 1. A headphone device which receives an output of an information reproducing apparatus to which a compressed digital audio signal is output, reproduces and listens to the digital audio signal, and converts the digital audio signal into an analog signal. A headphone device comprising: an electromechanical converter for reproducing an analog signal with a viewable signal. 2. A headphone device for receiving an output of an information reproducing apparatus which outputs a digital audio signal compressed in a different format and reproducing and viewing the digital audio signal, wherein the input digital audio signal is Determining means for determining which of the different formats has been compressed; converting means for converting the digital audio signal into an analog signal based on the result determined by the means; converting by the D / A converter A headphone device comprising: an electromechanical converter for reproducing the analog signal. 3. A headphone device for receiving an output of an information reproducing apparatus to which an analog audio signal and a digital audio signal compressed in a different format are output, and reproducing and viewing the analog signal or the digital audio signal. Determining means for determining which of the different formats the digital audio signal has been converted into; a converting means for converting the digital audio signal into an analog signal based on a result determined by the means; Selecting means for selecting whether to view the analog signal converted by the above or the analog signal received from the information reproducing apparatus. 4. The digital audio signal compressed in the different format includes at least PCM, AC3, DTS,
4. The image processing apparatus according to claim 1, wherein the data is one of MPEG.
4. The headphone device according to any one of 3.