JPH0586153U - Disc player - Google Patents

Abstract

(57) [Abstract] [Purpose] By storing the track number of the digital data detected by setting the flag I = 1, the reproduction output of the noise sound is cut off by the ON control of the mute circuit in the subsequent search operation. To do. [Structure] Digital data recording information detecting means 1 based on subcode information, memory means 3 for turning on a mute circuit 12 by digital data detection to set a flag I = 1 and storing a track number, and flag I = 1. Detecting means 4 for detecting the track number of digital data by
And the mute circuit 12 by the track number detection.
The ON control means 6 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disc player, and more particularly to a disc player suitable for arbitrarily reproducing digital audio signals and digital data.

[0002]

[Prior art]

 Conventionally, a general disc player, for example, a CD player reproduces a digital audio signal recorded on a disc to output an audio signal such as music, and reproduces digital data from a disc such as a CD-ROM to display it. The recorded information could be displayed on the device.

In reproduction of this CD player, particularly in audio signal output, the operation of a mute circuit incorporated in the CD player is controlled and reproduced and output so as not to output an unnecessary recording signal. The operation of the mute circuit of the audio signal output circuit during reproduction output will be described with reference to the flowchart shown in FIG.

When the CD player starts the reproducing operation (step S10), a micro computer (hereinafter, simply referred to as a microcomputer) built in the CD player determines whether the reproduced signal is digital data information according to the subcode information recorded on the disc. If it is judged (step S11) that the reproduced signal is not a digital data information but a digital audio signal in which music information is recorded, the microcomputer turns off the operation of the mute circuit (step S12), and the digital audio signal is output. The signal can be reproduced and output.

On the other hand, when the reproduction output from the disc is digital data, the microcomputer controls the operation of the mute circuit described above (step S13) so that the reproduction output of the digital data is not output to the audio signal output circuit. Was. The reproduced digital data was output through the decoder circuit. In this way, the audio output circuit for disk playback controls the output signal via the mute circuit, and cuts off unnecessary signals so that digital data information becomes noise and is not output as audio.

[0006]

[Problems to be solved by the device]

 However, in the conventional CD player described above, since the mute circuit is turned on after the digital data is judged by the built-in microcomputer, time is required until the mute circuit is turned on, and the digital signal is temporarily changed. There was a drawback that the data was output as noise and was reproduced as an unpleasant noise sound. There is also a problem that the unpleasant noise sound is output every time a track search is performed during reproduction of a CD player.

The present invention has been made in view of the above points, and the purpose thereof is to solve the drawbacks of the conventional example, detect digital data to turn on the mute circuit, and set the flag I = 1. By storing the track number of the digital data which is detected upright, it is possible to provide a disk player that cuts off the reproduction output of noise sound by immediately turning on the mute circuit during the subsequent track search operation.

[0008]

[Means for Solving the Problems]

 The disc player of the present invention reproduces a digital audio signal or digital data recorded on a disc by sub-code information, and the reproduced audio signal is output through a mute circuit in the disc player by the sub-code information. When the reproduction initial flag I = 0, the detecting means for detecting whether or not the recorded information is digital data information, and when the recorded information is digital data, the muting circuit is turned on to control the track number of the digital data. Memory means for storing the data, detecting means for setting the flag I = 1 to detect the track number of the digital data of the recording information, and on-control of the mute circuit by detecting the track number of the digital data. And a control means.

[0009]

[Operation] The operation of the present invention will be described with reference to the functional block diagram of FIG. According to this invention, at the time of reproducing the digital audio signal or digital data recorded on the disc by the subcode information, a flag I = 0 is set to detect whether the recorded information is digital data (detection means). 1).

When the recording information is digital data, the mute circuit of the audio signal output circuit is turned on to store the track number of the digital data with the flag I = 1 (memory means 3).

During the track search operation of the CD player thus set, the flag I = 1 is judged to detect whether the current reproduction track is the track number of the digital data (detection step 4), and the digital data is detected. If the track number is No., the mute circuit can be immediately turned on (mute ON means 6) to shut off the noise sound output from the audio signal output circuit.

As described above, at the beginning of the operation of the CD player, the digital data is judged and detected based on the sub-code information, and the digital data is reproduced for a moment only during the period (which requires a relatively long time) to turn on the mute circuit. Although the noise sound due to is generated from the audio output, the mute circuit can be immediately turned on when the flag I = 1 operates thereafter, so that the noise sound of the audio output can be eliminated.

[0013]

【Example】

 An embodiment of a disc player according to the present invention will be described with reference to FIGS. FIG. 1 is a functional block diagram showing the configuration of the present invention, FIG. 2 is a block diagram of hardware, and FIG. 3 is a flowchart explaining the operation.

In FIG. 2, reference numeral 10 denotes a disk reproducing device, which reproduces a digital audio signal recorded on the disk and outputs the audio through a mute circuit 12 of an audio signal output circuit. . The digital data recorded on the disc (CD-ROM or the like) is output via a decoder circuit (not shown).

Reference numeral 11 denotes a microcomputer (hereinafter referred to as "microcomputer"). The microcomputer 11 is basically composed of a CPU, a ROM, a RAM and an input port and an output port (not shown), as is well known. A program for controlling the CPU is written in the CPU, and the CPU takes in the required external data from the disc playback device 10 to the input port according to this program, or exchanges data with the RAM. However, it is possible to perform arithmetic processing and output the processed data to the mute circuit 12 or the like for control.

When a disc player having such a configuration, for example, a CD player, reproduces a recording disc, it determines whether the data is digital data or digital audio signal data based on the subcode information and reproduces a signal. This reproducing operation will be described with reference to the flowchart of FIG.

When the CD player starts the reproducing operation (step S1), the microcomputer 11 built in the CD player judges the flag I = 1 (step S2), and the flag I = 0 at the time of initialization. If it is determined in step S2 = No that the recorded information on the disc is digital data information (step S3), and if the recorded information is not digital data information but digital audio signals in which musical information is recorded, the microcomputer Can turn off the operation of the mute circuit 12 in the audio signal output circuit (step S4), and reproduce and output the digital audio signal.

On the other hand, when the reproduction output from the disc is digital data, the microcomputer 11 controls the operation of the mute circuit 12 to be turned on (step S5), and controls so that the reproduction output of the digital data is not output to the audio signal output circuit. can do. The microcomputer 11 sets the flag I = 1 and stores the track number of the reproduced digital data in the PAM inside the microcomputer 11 (step S6).

As described above, when the track number of the digital data is stored in the memory and the flag I = 1 is set, thereafter, when the CD player performs the track search, the microcomputer 11 determines the flag I = 1. (Step S2), the flag I = 1 is detected to determine whether the current playback track is a digital data track (Step S7), and if it is not digital data, the mute circuit 12 is turned off (Step S8). ), If it is digital data, the mute circuit 12 can be turned on (step S9).

As described above, the CD player generates noise due to the detection of the digital data only once, but after that, when the disc reproducing apparatus 10 starts the reproducing play or the search operation, the flag I = 1 is set. Therefore, the mute operation of the mute circuit 12 can be immediately turned on, and noise output due to digital data reproduction can be blocked for audio output.

As described above, only one track number of the digital data is stored in the memory and the flag I = 1 is set. However, a plurality of track numbers of the digital data are similarly memorized to perform the reproduction and the search operation. You can also do it.

[0022]

[Effect of the device]

 As described above, the disc player according to the present invention can eliminate the noise caused by the digital data output from the audio signal output circuit when the disc operation including the digital data is reproduced by controlling the mute circuit on. There is an effect that a comfortable audio reproduction signal can always be reproduced and output from the audio signal output.

Moreover, the function of blocking the noise of the audio output due to the reproduction of the digital data largely depends on the software of the built-in microcomputer, and there is an effect that the function can be increased without increasing the cost. It has excellent features such as being easy.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing a configuration of a disc player according to the present invention.

FIG. 2 is a block diagram showing a hardware configuration of a main part of the present invention.

FIG. 3 is a flowchart explaining the operation of the present invention.

FIG. 4 is a flowchart showing an operation of a conventional example.

[Explanation of symbols]

 10 Disc player 11 Microcomputer 12 Mute circuit

Claims (1)

[Scope of utility model registration request] 1. A disc player in which a digital audio signal or digital data recorded on a disc is reproduced by subcode information, and the reproduced audio signal is output through a mute circuit. In the disc player, an initial flag for reproduction is produced by the subcode information. I
Detecting means for detecting whether or not the record information at = 0 is digital data information, and memory means for storing the track number of the digital data by turning on the mute circuit when the record information is digital data.
A disc provided with detection means for setting a flag I = 1 to detect a track number of digital data of recorded information, and control means for turning on the mute circuit by detecting the track number of the digital data. Player.