JPH04241264A - Sound reproducing device - Google Patents

Abstract

PURPOSE:To provide the sound reproducing device which does not require the movement of a trial listener to a device body side even at the time of exchanging prerecorded cassette (cassette tape, compact disk, etc.). CONSTITUTION:This sound reproducing device is constituted to transmit the reproduced signals on the device body A side having sound reproducing means 1 to 3 which can be operated at the listener's hand to an acoustic converter B side by a light signal. An A/D converter 7 provided on the reproduced output side of the above-mentioned reproducing devices 1 to 3 and a light emitting device 8 which emits the reproduced output converted to a digital signal by the converter 7 as a light signal are provided in addition to the above-mentioned sound reproducing devices on the device body A side. ON the other hand, a light receiving device 21 which receivers the light signal, a A/D converter 22 which converts the received digital signal to an analog signal, an amplifier circuit 23 which amplifies this signal and a speaker 28 which outputs the signal after the amplification are provided on the acoustic converter B side.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound reproducing apparatus in which a reproduced signal from the main body of the apparatus having a sound reproducing means is transmitted as an optical signal to an acoustic transducer having a speaker.

0002

2. Description of the Related Art Conventionally, this type of sound reproduction device uses a code as a means for transmitting a reproduction signal from the device main body having a sound reproduction means to an acoustic transducer (ie, a speaker box) having a speaker. Most of the transmission was by wire. In recent years, the trend has been to use an optical remote control commander using infrared rays at the listener's hand to control the main body of the device at a remote location. FIG. 6 shows a conventional example in which an optical remote control commander at the listener's hand controls the main body of the apparatus at a remote location. In FIG. 6, when an operation button of a signal generator 62 of a remote control commander 61 is pressed, a control signal is generated and an infrared light is emitted from a light emitter 63 into space. The infrared light is converted into an electrical signal by the receiver 64 and transmitted to the control section 65, which controls the tuner 66, tape player 67, CD player 68, changeover switch 69, volume 71, etc. For example, a signal from the tuner 66 is transmitted from the a terminal of the selector switch 69, via the amplifier 70 and the volume 71, to the power amplifier 72.
The speaker 73 is driven.

0003

[Problem to be Solved by the Invention] However, in the conventional sound reproduction device as described above, since the listener and the main body of the sound reproduction device are located at a distance, it is necessary to exchange music software (cassette tape, compact disc). There was a problem in that the listeners had to move in order to do so.

[0004] The present invention has been made in view of the above-mentioned conventional problems, and aims to provide a sound reproduction device that does not require the listener to move when exchanging music software (cassette tapes, compact discs, etc.). It is something that

[0005]

[Means for Solving the Problems] In order to solve the above problems, the sound reproduction device of the present invention transmits a reproduction signal from the main body of the device having a hand-operable sound reproduction means to an acoustic transducer having a speaker. A sound reproduction device configured to transmit signals, the device main body side including, in addition to the sound reproduction means, an A/D converter provided on its reproduction output side;
a light emitter that emits the reproduced output converted into a digital signal by the A/D converter as an optical signal, and a light receiver that receives the optical signal on the acoustic converter side;
D/A converts received digital signals to analog signals
It is equipped with a converter, an amplifier that amplifies the signal, and a speaker that outputs the amplified signal.

[0006]

[Operation] With the above-described configuration, the present invention converts the reproduction signal reproduced by the acoustic reproduction means included in the device main body at hand into a digital signal, transmits it as an optical signal to the acoustic transducer side, and transmits the digital signal to the acoustic transducer side. It is a signal that can be converted back to an analog signal and reproduced by a speaker via an amplifier provided on the acoustic converter side, and the music software (cassette tape, compact disc, etc.) that is reproduced by the audio reproduction means on the device main body side can be replaced. This can also be done without the listener having to move.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A sound reproducing apparatus according to an embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 5.

FIG. 1 shows a sound reproducing apparatus according to an embodiment of the present invention, and shows in block diagrams the configurations of a main body side A having a sound reproducing means and an acoustic transducer side B having a speaker. The device main body side A and the acoustic transducer side B are arranged as shown in FIG. is located on the side A of the main body of the apparatus and constitutes a sound reproduction means. Reference numeral 4 denotes a changeover switch, which selects the signals from the reproducing means 1 to 3 and transmits them to the amplifier 5. The signal amplified by amplifier 5 is
The sound volume is adjusted with the volume 6 and then added to the A/D converter 7. The A/D converter 7 converts the frequency and level of the analog signal directly into a digital signal. This conversion format is, for example, the E
IAJ's digital audio interface etc. can be used. The digital signal converted by the A/D converter 7 is passed through the data rearrangement section 14, has parity added to it by a parity generation circuit 37, is passed through a biphasing circuit 36, is passed through a resistor 38, and is connected to a light emitter 8 by a transistor 39. and is emitted into space as an optical signal.

Reference numeral 11 denotes a power terminal provided on the device main body side A, and the power supplied from this power terminal 11 is supplied to the control signal generator 9 by the power switch 10 and also to the light amount changeover switch 12. . Control signal generator 9
When power is supplied to the converter, it generates a signal to control the power control section 29 on the acoustic transducer side B, which will be described later, and this control signal is applied to the biphasing circuit 36 via the parity generation circuit 37, and the reproduction The signal is converted into serial data and emitted into space from the light emitter 8. This control signal is
For example, the user data format of EIAJ's digital audio interface can be used. The A/D converter 7 and the preamble generation circuit 35 are synchronized by a clock timing circuit 34, and the data rearrangement section 14 is synchronized by a variable frequency oscillator 32, a phase comparator 33, and a clock timing circuit 34. On the other hand, the light amount changeover switch 12 supplies the power supply voltage as it is at the position a, and supplies the power supply voltage via the resistor 13 at the position b, so that the light amount decreases. This light intensity switch 1
The switching in step 2 is performed depending on the installation status of the acoustic transducer side B with respect to the device main body side A, and the light amount is configured to be appropriately set to the optimum light amount.

Next, on the acoustic transducer side B, 21
is a light receiver, and the light signal emitted from the light emitter 8 and transmitted through space is received by this light receiver 21. The received optical signal is converted into an electrical signal and sent to a high frequency amplifier 4.
0 and added to the parity check circuit 42,
If there is no error in the data, the subsequent D/A converter 2
2, the signal is converted into an analog signal, amplified by an amplifier 23 and a power amplifier 27, and then outputted from a speaker 28. Power is supplied to all circuits from the power supply terminal 24.

FIG. 2 shows the configuration of a second embodiment of the acoustic transducer side B. Below, the above figure 1 of this example
Only the points that differ from the above will be explained. First, in this embodiment, power is not directly supplied to the A/D converter 22, amplifier 23, and power amplifier 27 from the power supply terminal 24, but is supplied via the power supply control section 29. And always power supply terminal 2
In the photoreceiver 21 which is directly supplied with power from the parity check circuit 4, the optical signal transmitted through the space is converted into an electrical signal, amplified by the high frequency amplifier 40, and then sent to the parity check circuit 4.
If there is no error in the data, it is added to the serial-to-parallel converter 41. This serial/parallel converter 41 converts serial data into parallel data, and the output data is applied to the control signal receiver 26. This control signal receiver 26 decodes the control signal generated by the control signal transmitter 9 on the device main body side A, and the control signal is applied to the power supply control section 29, which then converts the D/A. Power is supplied to the amplifier 22, the amplifier 23, and the power amplifier 27,
This enables reproduction output from the speaker 28 on the side of the acoustic transducer B. Further, the output data of the serial-to-parallel converter 41 is applied to a parallel-to-serial converter 45, which converts the parallel data into serial data, and then converts the parallel data into serial data to the next D/A converter 2.
Output to 2. Note that 43 is a timing pulse generator that supplies timing pulses to the serial-to-parallel converter 41 and the parallel-to-serial converter 45 to match their timings.

FIG. 3 shows the configuration of a second embodiment of the apparatus main body side A. Only the differences between this embodiment and FIG. 1 will be described below. In this embodiment, the volume 6 provided between the A/D converter 7 and the amplifier 5 is abolished, and the level variable signal generator 31 is controlled by the volume 6a and added to the control signal generator 9, and the corresponding The level variable signal is emitted from the light emitter 8 into space as an optical signal. This level variable signal can be in the user data format of the EIAJ digital audio interface used in audio equipment.

FIG. 4 shows the configuration of a third embodiment of the acoustic transducer side B. This figure differs from FIG. 2 in that a level variable device 30 is provided between the amplifier 23 and the power amplifier 27. The optical signal transmitted to the light receiver 21 through space is converted into an electrical signal and applied to the control signal receiver 26, where it is sent to the device main body side A shown in FIG.
The control signal generated by the control signal transmitter 9 is decoded, and the power supply control signal is applied to the power supply controller 29.
From 9, D/A converter 22, amplifier 23, power amplifier 27
, power is supplied to the level variable device 30, and the control signal generated by the control signal transmitter 9 on the device main body side A is decoded to control the level variable device 30. can be controlled. By doing so, it is possible to suppress the magnitude of abnormal sound when the D/A converter 22 malfunctions due to noise, and further improve the S/N when the level is low.

[0014]

As described above, the present invention provides a sound reproducing device in which a reproduced signal from the main body of the device having a sound reproducing means is transmitted as an optical signal to an acoustic transducer having a speaker. In addition to the sound reproduction device, the main body of the device includes an A/D converter on its reproduction output side, and a light emitter that emits the reproduction output converted into a digital signal by the A/D converter as an optical signal. On the other hand, on the acoustic transducer side, a light receiver that receives the optical signal, a D/A converter that converts the received digital signal into an analog signal, and an AF amplifier that amplifies the signal. Since it is configured to include a speaker that outputs an amplified signal, it is possible to provide an audio reproduction device that does not require the listener to move even when changing music software (cassette tape, compact disc).

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a first embodiment of the sound reproduction device of the present invention.

[Fig. 2] Block diagram showing a second embodiment of the acoustic transducer side

[Fig. 3] Block diagram showing a second embodiment of the device main body side

[Fig. 4] Block diagram showing a third embodiment of the acoustic transducer side

[Figure 5] Configuration diagram of the entire audio device

[Fig. 6] Block diagram showing a conventional sound reproduction device

[Explanation of symbols]

1 Tuner 2 Tape player 3 CD player 4 Selector switch 5 Amplifier 6 Volume 7 A/D converter 8 Light emitter 9 Control signal transmitter 10 Power switch 12 Light intensity selector switch 21 Photo receiver 22 D/A converter 23 Amplifier 26 Control signal receiver 27 Power amplifier 28 Speaker 29 Power control section 30 Level variable device 31 Level variable signal generator

Claims (6)

[Claims] 1. A sound reproducing device configured to transmit a reproduced signal from a main body of the device having a hand-operable sound reproducing means to an acoustic transducer having a speaker as an optical signal, wherein a reproduction signal is transmitted to the main body of the device by an optical signal. In addition to the sound reproduction means, there is also an A/D converter provided on the reproduction output side, and this A/D converter.
A light emitter that emits the reproduced output converted into a digital signal by a converter as an optical signal, and on the side of the acoustic converter, a light receiver that receives the optical signal, and a light receiver that converts the received digital signal into an analog signal. A D/A converter to convert,
A sound reproduction device characterized by comprising an amplifier that amplifies the signal, and a speaker that outputs the amplified signal. 2. A volume for adjusting the volume of the audio signal reproduced by the audio reproduction means is provided on the main body of the device,
2. The sound reproduction device according to claim 1, wherein the sound reproduction device is configured to be variably adjusted by the volume and then transmitted from the light emitter to the acoustic transducer as an optical signal. [Claim 3] There is a power switch on/off on the device main body side.
A control signal transmitter that detects OFF control and transmits a control signal is provided, and the control signal is transmitted to the acoustic transducer side together with the audio signal reproduced by the acoustic reproduction means, and the power source of the acoustic transducer is controlled by this control signal. 2. The sound reproducing device according to claim 1, wherein the sound reproducing device is configured to perform ON/OFF control. 4. A detection means for detecting the presence or absence of an optical signal is provided on the acoustic transducer side, and the power supply on the acoustic transducer side is controlled to turn ON/OFF based on the optical signal detection output of the detection means. The sound reproduction device according to claim 1, characterized in that: 5. A switching means or a variable means for changing the light intensity of the optical signal to be emitted is provided on the device main body side, and the light intensity is set to be optimal depending on the installation situation of the acoustic transducer with respect to the device main body. The sound reproduction device according to claim 1, characterized in that: 6. On the acoustic conversion side, a level variable means such as a volume is provided before the power amplifier, and the volume at the front stage of the power amplifier on the acoustic transducer side is controlled by the volume position on the device main body side. The sound reproduction device according to claim 2, characterized in that: