JPH065056A - Audio reproduction system - Google Patents

Abstract

PURPOSE:To reproduce audio according to an audio data being stored in a memory on reproduction by transferring a digital audio being stored in a CD to the memory. CONSTITUTION:A portable audio reproduction device 1 can be stored in a storage part 6 of a digital data transfer device 2 and transfers digital data of a CD3 being fitted to a tray 4 to the memory of the audio reproduction device 1 via contacts 7 and 8 for storage. The audio reproduction system 1 is provided with a display, etc., in addition to various types of switches.

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] A sound reproducing system for reproducing digital sound recorded on a compact disc,
In particular, it relates to a portable voice reproducing device.

[0002]

2. Description of the Related Art Unlike a LP record player, a playback device for playing back digital audio stored on a compact disc (hereinafter referred to as a CD) having a diameter of 12 cm must be used while being kept horizontal. Instead, it is also used as a portable device. It is important that a portable CD reproducing device is of a power saving type because it is particularly small and lightweight and can be reproduced for a long time with low power consumption.

[0003]

However, the conventional portable CD reproducing apparatus (player) has the following problems. A portable CD player is at least a CD
Is large, and a large-capacity battery is mounted for long-term reproduction, which makes the entire device heavy. Since the CD is rotating at the time of playback, it may cause noise due to vibration when carried. When the information stored in the CD is transferred to the transfer device, it is inconvenient if the time required for the transfer is not displayed, and if the time display is not decremented during the transfer, it will not be known how long the transfer will end. If the built-in battery cannot be charged at the same time as the transfer, another large charging device or charging terminal must be provided.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a portable voice reproducing apparatus which is free from vibration due to vibration and which can be charged during transfer.

[0005]

In order to achieve the above object, an audio reproducing system according to the present invention comprises an input means for inputting a digital audio signal according to claim 1, and audio data input by the input means. A portable audio reproducing device for reproducing the output from the memory, a compact disc reproducing device, and a voice for directly outputting an audio digital signal reproduced by the compact disc reproducing device to the outside. A digital audio transfer device having a digital signal output means, and the digital audio transfer device according to claim 2 has a storage part for storing or mounting a portable audio reproduction device. However, with the portable audio reproduction device stored or attached, the digital audio output device of the digital audio transmission device The digital audio input means of the portable audio reproducing device is further configured to transfer the digital audio of the compact disc, and further, a switch input circuit is provided in claim 3, and the switch input circuit is provided. In addition, the state of the digital audio transfer switch is monitored and controlled to perform the transfer operation. Further, in claim 4, the digital audio output means of the digital audio transfer device and the digital audio of the portable audio reproduction device are controlled. The input means may be connected by photoelectric conversion.

[0006]

With the above structure, the device is compact and lightweight, and there is no sound jump during playback.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a diagram showing the overall configuration of this system. In FIG. 1, 1 is a portable audio reproducing device (hereinafter, simply referred to as an audio reproducing device), and 2 is a digital data transfer device (hereinafter, simply referred to as a transferring device). Reference numeral 3 is a compact disc, 4 is a tray on which the compact disc 3 is placed, 5 is an AC outlet cord, 6 is a housing portion of the audio reproducing device 1, and 7 is an electric state when the audio reproducing device 1 is attached to the transfer device 2. Contact point for contact with the sound reproduction device 1
2 is a front view of the audio reproducing device, 10 is an audio reproducing switch, 11 is a reproduction stop switch, 12 is a headphone connection terminal, 13 is a liquid crystal (LC
D) display, 14 is a mark provided in the LCD 13 which is lit during transfer, 15 is a mark which is lit at the end of transfer, 1
Reference numeral 6 denotes a segment display unit that subtracts and displays the time until the transfer is completed during the transfer.

Next, FIGS. 3 and 4 are diagrams showing the configuration of the present system, and the same components as those in FIG. 1 are designated by the same reference numerals. In FIG. 1, 17 is a CPU that controls the sequence of this system, and 18 is a read-only memory (RO) that stores programs and data tables.
M), 19 are random access memories (RAM) for storing data, 20 is an oscillation circuit for timing the system operation, 21 is a motor for rotating the CD, 22 is light emission and light reception (not shown) for reading the data of the CD An optical head composed of elements, 23 is an RF signal amplifier (hereinafter referred to as RF amplifier) for detecting the output of the optical head 22, 2
Reference numeral 4 is a well-known digital signal processing circuit for converting the output of the RF amplifier 23 into a digital signal and at the same time performing processing such as synchronization signal detection, error correction, and sub-code demodulation.
This is a servo circuit that applies servo to the output of the F amplifier 23 and the output of the digital signal processing circuit 24 so that signals can be properly detected with respect to focus and tracking of the optical head or rotation of the motor 21.

Next, 26 is a digital signal receiving circuit for receiving voice data or sub-code output from the digital signal processing circuit 24, and 27 is RA for storing voice data.
A memory configured by M or the like, 28 is a digital-analog converter, 29 is an amplifier (amplifier), 30 is headphones, 31 is a line output amplifier, 32 is a line output terminal, 33 is an AC / DC converter, and 34 is a storage battery 36. The charging circuit 35 is a voltage detection circuit that detects the state of charge of the storage battery 36 and limits the operation of the charging circuit 34 when the battery is sufficiently charged, and 37 is a buzzer. 71 and 81 are GND terminals, 72 and 82 are control signal terminals, 73
Reference numerals 83 and 83 are digital audio connection terminals, 74 and 84 are analog audio connection terminals, 75 and 85 are charging terminals, and 76 and 86 are voltage detection terminals.

Next, the actual operation in the system of FIGS. 3 and 4 will be described. First, when the audio reproducing device 1 is housed in the housing part 6 of the transfer device 2, the connection terminals 7 and 8 come into contact with each other, and the terminals 71 to 76 and 81 to 86 are electrically connected. In this state, the voltage detection circuit 35 incorporated in the transfer device 2 detects the output voltage of the storage battery 36 via the voltage detection terminals (76 to 86) and reduces the charging current if the output voltage is equal to or higher than the predetermined voltage. If the voltage is less than or equal to the voltage, it operates so as to perform charging with a large current, and the charging time is shortened in total. The output of the storage battery 36 is supplied as a power source in the reproducing device.

Next, a digital voice transfer method will be described with reference to the flowchart of FIG. When the transfer switch 9 is turned on in the state where the audio reproducing device 1 is housed in the transfer device 2 (step 1, hereinafter S1), the memory 27 is set in S2.
Clear the contents of. Then, in S3, the reproduction of the CD is started. Since the reproduction is the same as that of a known CD player, the description is omitted here.

Here, before the audio data is output to the CD, the audio recording time of the disc to be reproduced, the number of recorded songs, and the like are stored as subcodes. When this audio recording time data is reproduced from the CD and received by the receiving circuit 26, it is input to the CPU 17 (S4). Next, by dividing the recording time by the preset transfer rate, the time required for the transfer can be obtained (S
5). The time obtained here is displayed on the display unit 16 of the LCD display 13 in units of seconds, for example (S6). Next, after that, the audio data is actually transferred, and at the same time, the mark 32 indicating that the audio data is being transferred is turned on. Next, in S8, it is determined whether or not the end code (END code) of the audio data is detected. If the END code is not detected, the transfer is 1 in S9.
Whether or not seconds have elapsed is determined, and if 1 second has elapsed, the transfer required time is set to minus 1 second. This makes LC
The contents of the transfer time display section 16 of D13 will be down-counted. Next, when the transfer progresses and all the data have been transferred, the transfer operation is ended when the END code is detected in S8, and mark 3 is displayed to indicate that the transfer is completed.
3 is turned on (S11). Similarly, the end of transfer is warned by turning on the buzzer 6 for a predetermined time (S1).
2).

Next, a case where reproduction is performed by the audio reproducing apparatus 1 will be described with reference to the flowchart of FIG. When the reproduction switch 10 of the audio reproduction device 1 is turned on, reproduction starts (S21). For reproduction, the data stored in the memory 27 is sequentially read and output to the DA converter 28 (S2).
2) By doing. The audio analog output of the DA converter 28 is amplified by the headphone amplifier 29.
Next, in S23, the playing time recorded in the sub code is set to L
It is displayed on the CD 13 and reproduced. When the switch 11 is turned on to end the performance, it is determined in S24 that the reproduction can be ended (S25).

Next, description will be made on a case where the audio reproducing apparatus 1 is reproduced while being housed in the transfer apparatus 2. In this case, the analog voice of the DA converter 28 is amplified by the amplifier 29, and the signal is input to the line output amplifier 31 built in the transfer device 2 through the analog output feedback terminals (74 to 84). The output of the line output amplifier 31 is output to the outside from the line-out terminal 32. If an audio amplifier and a speaker are connected to the outside, a known stationary CD player with the audio reproduction device 1 and the transfer device 2 combined. Function as.

7 and 8 are block diagrams of the second embodiment of the present invention. In the second embodiment, the digital audio data transfer method is optical. By doing so, the transfer rate can be increased and the transfer time can be shortened. 7 and 8 are different from FIG. 1, reference numeral 38 denotes a light emitting element including an infrared light emitting diode driven by the output of the digital signal processing circuit,
Reference numeral 39 is a light receiving element including a phototransistor or the like. The output of the light receiving element 39 is current / voltage converted and input to the digital signal receiving circuit. Since the other points are the same as those of the first embodiment shown in FIGS. 1 to 4, description thereof will be omitted.

FIGS. 9 to 12 are views for explaining the third embodiment of the present invention, and this third embodiment is an example in which the transfer switch 9 is configured in the transfer device 2. In FIGS. 11 and 12, 38 is a switch input circuit. Next, the operation of FIGS. 9 to 12 will be described. In the present apparatus, the switch input circuit 38 always detects the state of the transfer switch 9, and the CPU 17 performs the transfer operation by detecting the state of the switch 9 via the control terminal according to the sequence. Since the other operations are the same as those of the first embodiment shown in FIGS. 1 to 4, the description thereof will be omitted.

[0017]

According to the present invention, since the digital audio data of the CD is digitally transferred to the memory and the reproduction is performed by the contents of the memory, there is no mechanical operation such as rotation and movement of the optical head unlike the CD reproduction. In addition, there is no sound jump due to vibration when carrying, and there is almost no deterioration in sound quality due to digital playback. Since the transfer device is provided with the battery charging means and charging is performed in a state where the battery charger is attached for the transfer, the reproducing device does not have to be provided with a charging terminal or a charging device is connected. Since the time required for the transfer is displayed and is configured to be subtracted and counted with the progress of charging, the remaining time of the transfer can be confirmed. When the transfer is completed, a warning is given by a display or sound, so that the end of the transfer can be clearly understood. When the playback device is attached to the transfer device, it becomes a stationary CD player, so that the range of applications is expanded.

[Brief description of drawings]

FIG. 1 is an external view of a portable voice transfer / playback system according to an embodiment of the present invention.

FIG. 2 is a front view of a reproducing apparatus according to an embodiment of the present invention.

FIG. 3 is an internal configuration diagram of a voice transfer device that is an embodiment of the present invention.

FIG. 4 is an internal configuration diagram of an audio reproducing device according to an embodiment of the present invention.

5 is a transfer flowchart of FIG.

FIG. 6 is a reproduction flowchart of FIG.

FIG. 7 is a diagram showing a configuration of a voice transfer device according to a second embodiment of the present invention.

FIG. 8 is a diagram showing a configuration of an audio reproducing device according to a second embodiment of the present invention.

FIG. 9 is an external view of a third embodiment of the present invention.

FIG. 10 is a front view of a reproducing apparatus according to a third embodiment of the present invention.

FIG. 11 is a block diagram of a voice transfer device according to a third embodiment of the present invention.

FIG. 12 is a block diagram of an audio reproducing device according to a third embodiment of the present invention.

[Explanation of symbols]

 1 Audio Playback Device 2 Transfer Device 3 CD 7, 8 Connection Terminal 12 Headphone Connection Terminal 13 LCD Display 14 Transfer Mark 15 Transfer Complete Mark 16 Transfer Time Display 17 CPU 18 ROM 19 RAM 20 Oscillation Circuit 21 Motor 22 Optical Head 24 Digital Signal Processing circuit 26 Digital signal receiving circuit 27 Memory 28 DA converter 33 AC / DC converter 34 Charging circuit 35 Voltage detection circuit 36 Storage battery 37 Buzzer 38 LED light emitting element 39 Phototransistor light receiving element 75 to 85 Charging terminal 76, 86 Voltage detecting terminal

Claims (4)

[Claims] 1. A portable audio reproducing apparatus comprising an input means for inputting an audio digital signal and a memory for storing the audio data input by the input means, and a portable audio reproducing apparatus for reproducing an output from the memory, An audio reproducing system comprising: a compact disk reproducing device; and a digital audio transfer device having an audio digital signal output means for directly outputting an audio digital signal reproduced by the compact disk reproducing device to the outside. 2. The digital audio transfer device according to claim 1, wherein the digital audio transfer device has an accommodating portion for accommodating or attaching the portable audio reproducing device, and the portable audio reproducing device is accommodated or attached to the digital audio transmitting device. An audio reproducing system characterized in that the digital audio output means of the transfer device is configured to transfer the digital audio of the compact disc to the digital audio input means of the portable audio reproducing device. 3. A voice according to claim 1, wherein a switch input circuit is provided, and the state of a digital voice transfer switch is monitored and controlled through the switch input circuit to perform a transfer operation. Playback system. 4. The audio reproduction system according to claim 2, wherein the digital audio output means of the digital audio transfer device and the digital audio input means of the portable audio reproduction device are connected by photoelectric conversion.