JP3593364B2 - Recording medium playback device - Google Patents

Description

[0001]
[Industrial applications]
This invention relates to a recording medium reproducing apparatus such as an optical disk reproducing apparatus, it relates particularly to a surround decoder unit for surround sound audio data to an external connectable recording medium reproducing equipment.
[0002]
[Prior art]
MPEG (Moving Picture Image Coding Expert Group) 1, MPEG2, and the like are standardized as encoding methods having a plurality of audio stream data. MPEG1 audio is audio data of up to two channels, and MPEG2 audio is an extension of multichannel and multilingual audio data.
[0003]
FIG. 3 is a diagram showing a frame structure of the MPEG2 audio. As shown in the figure, an MPEG2 audio frame is composed of MPEG1 header 1, MPEG1 audio data 2, multi-channel header 3, multi-channel audio data 4, multi-lingual audio data 5, and MPEG1 auxiliary data 6. MPEG1 audio data 2 is monaural or stereo. The multi-channel audio data 4 is surround, and is composed of a maximum of 3.1 channels of stereo surround (2 ch), center (1 ch), and subwoofer (0.1 ch). The multilingual audio data 5 is audio data for various languages, and can have up to seven channels.
[0004]
A reproducing apparatus for a medium in which a plurality of high-efficiency encoded audio streams such as MPEG1 and MPEG2 are recorded, and has a function of selecting two arbitrary streams, mixing these streams, and outputting them. There is. For example, a stream of a background sound of a movie and a stream of a language sound (dialog) of one country are selected, mixed, and output. At this time, the audio data of the two selected streams is decoded through different decoders, and an audio output is obtained by mixing the decoded data.
[0005]
Here, it is assumed that the data recorded on the medium is a collection of data units including a header 11, audio data 12, and video data 13, as shown in FIG. A data unit is a group of data based on a certain reproduction time (for example, one second). The audio data 12 and the video data 13 are, for example, high-efficiency compression-coded data such as MPEG. The audio data 12 is composed of a plurality (m) of audio streams (# 0,..., #M) 14. Each audio stream 14 has a plurality of (n) consecutive audio frames (# 0, # 1, # 1). .., #N) 15. The audio frame 15 includes a frame header 16 and frame data 17.
[0006]
FIG. 5 is a block diagram showing a configuration of an optical disk reproducing apparatus for reproducing data recorded on the optical disk. In FIG. 1, reference numeral 101 denotes an optical disk on which data is recorded in the structure shown in FIG. An optical pickup 102 reads a signal recorded on the optical disk 101. The signal read by the optical pickup 102 is amplified by the RF amplifier 103 and then supplied to the RF signal processing circuit 104. The RF signal processing circuit 104 equalizes and binarizes the amplified signal and converts it into data. The binarized data output from the RF signal processing circuit 104 is sent to a data processor 105, where data demodulation and error correction are performed.
[0007]
The output of the RF amplifier 103 is also sent to the servo control circuit 106. The servo control circuit 106 detects a tracking error and a focus error from the output of the RF amplifier 103 and outputs both detection signals to the drive circuit 107. The drive circuit 107 drives a feed mechanism (not shown) of the optical pickup 102 based on the two detection signals to perform focus control and tracking control. Further, the servo circuit 106 divides the frequency of the synchronization signal component extracted from the output of the RF amplifier 103 and sends the divided signal to the drive circuit 107. The drive circuit 107 drives the disk motor 108 based on the frequency-divided signal.
[0008]
On the other hand, the data demodulated and error-corrected by the data processor 105 are sent to the system processor 109 in data unit units. The system processor 109 separates audio data and video data from the input data unit, and outputs the video data to the MPEG video decoder 110. Further, the system processor 109 selects two streams of m audio streams of the audio data from the input unit data, and selects one of these two streams to the first MPEG audio decoder 111 and the other to the second MPEG audio decoder 111. Output to the MPEG audio decoder 112.
[0009]
The MPEG video decoder 110 decodes the encoded video data and outputs the decoded video data to the video encoder 113. The video encoder 113 generates and outputs a video signal for reproduction from the decoded video data.
[0010]
On the other hand, the MPEG audio decoders 111 and 112 decode audio data for each audio frame constituting each audio stream, and output the decoded audio data to the mixer circuit 114. The mixer circuit 114 mixes the two audio data, and outputs the mixed audio data to the D / A converter 115. The mixed audio data is converted into an analog signal by a D / A converter 115, and then output as an audio signal for reproduction via an amplifier 116.
[0011]
Recently, a surround decoding unit, which is a dedicated device for surround reproduction, has been developed and commercialized as a device that is externally connected to such an optical disc reproducing device. The optical disc reproducing apparatus has a dedicated terminal 117 for externally connecting the surround decoding unit 201, and is configured to output audio data to the surround decoding unit 201 through the terminal 117.
[0012]
[Problems to be solved by the invention]
However, in such a conventional optical disc reproducing apparatus, since the above-mentioned reproducing operation is executed completely irrespective of the connection state of the surround decoder unit, when the surround decoder is connected to perform the surround reproduction. In addition, there is a problem that the quality of the surround sound is significantly deteriorated due to the background sound overlapping the surround sound.
[0013]
SUMMARY OF THE INVENTION The present invention is to solve the above-described problem. When a surround decoder unit is connected and surround reproduction is performed by the unit, sound streams of language sound and background sound are mixed as sound data to be reproduced. It is an object of the present invention to provide a recording medium reproducing apparatus capable of outputting only a language sound even in such a case.
[0015]
[Means for Solving the Problems]
For the record medium reproducing apparatus of the present invention to achieve the above object, the recording medium reproducing apparatus for reproducing a recording medium in which a plurality of kinds of audio data have been recorded, including the language speech and background sounds, said plurality of types Means for selecting any two types of audio data from the audio data, means for respectively decoding the selected two types of audio data, and synthesizing and outputting the decoded two types of audio data Means for connecting a surround decoder unit for reproducing the audio data of the background sound in surround, a detecting means for detecting that the surround decoder unit is connected to the terminal, and the detecting means It is detected that the surround decoder unit is connected to the terminal. When in a discriminating means for discriminating each type of the two audio data decoding is performed by the decode means, means for canceling the decoded result of the audio data type is judged to be a background sound by said discrimination means And characterized in that:
[0016]
For the record medium reproducing apparatus of the present invention to achieve the above object, the recording medium reproducing apparatus for reproducing a recording medium in which a plurality of kinds of audio data have been recorded, including the language speech and background sounds, said plurality of types Means for selecting any two types of audio data from the audio data, means for respectively decoding the selected two types of audio data, and synthesizing and outputting the decoded two types of audio data Means, a terminal to which a surround decoder unit for surround reproduction of the audio data of the background sound can be connected, and an input for instructing execution of surround reproduction by the surround decoder unit externally connected to the terminal. an input means for receiving an instruction to execute the surround reproduction by said input means A discriminating unit that discriminates between two types of audio data to be decoded by the decoding unit when an input is received, and a decoding result of the audio data whose type is determined to be a background sound by the discriminating unit. And means for canceling .
[0018]
[Action]
In record medium reproducing apparatus of the present invention, in response to connection detection surround decoder unit to the terminal, determines the type of the two audio data decoding is performed by the decoding means, respectively, it is that the type is a background sound Since the decoding result of the determined audio data is canceled , the surround sound and the background sound are not output simultaneously, and the deterioration of the surround sound quality due to the overlap of the surround sound and the background sound can be prevented.
[0021]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0022]
FIG. 1 is a block diagram showing a configuration of an optical disc reproducing apparatus according to one embodiment of the present invention.
[0023]
In the figure, reference numeral 301 denotes an optical disk on which data is recorded in the structure shown in FIG. Reference numeral 302 denotes an optical pickup for reading a signal recorded on the optical disk 301. The signal read by the optical pickup 302 is amplified by the RF amplifier 303 and then supplied to the RF signal processing circuit 304. The RF signal processing circuit 304 performs waveform equalization and binarization on the amplified signal to convert the amplified signal into data. The binarized data output from the RF signal processing circuit 304 is sent to a data processor 305, where data demodulation and error correction are performed.
[0024]
The output of the RF amplifier 303 is also sent to the servo control circuit 306. The servo control circuit 306 detects a tracking error and a focus error from the output of the RF amplifier 303 and outputs both detection signals to the drive circuit 307. The drive circuit 307 drives a feed mechanism (not shown) of the optical pickup 302 based on both detection signals to perform focus control and tracking control. Further, the servo circuit 306 divides the frequency of the synchronization signal component extracted from the output of the RF amplifier 303 and sends the frequency-divided signal to the drive circuit 307. The drive circuit 307 drives the disk motor 308 based on the frequency-divided signal.
[0025]
On the other hand, the data demodulated and error-corrected by the data processor 305 are sent to the system processor 309 in data unit units. The system processor 309 separates audio data and video data from the input data unit, and outputs the video data to the MPEG video decoder 310. Further, the system processor 309 selects two streams out of m audio streams of audio data from the input unit data, one of the two streams to the first MPEG audio decoder 311 and the other to the second MPEG audio decoder 311. Output to the MPEG audio decoder 312.
[0026]
The MPEG video decoder 310 decodes the encoded video data and outputs the decoded video data to the video encoder 313. The video encoder 313 generates and outputs a video signal for reproduction from the decoded video data.
[0027]
On the other hand, the MPEG audio decoders 311 and 312 decode audio data for each audio frame constituting each audio stream, and output the decoded audio data to the mixer circuit 314. The mixer circuit 314 mixes the two audio data, and outputs the mixed audio data to the D / A converter 315. The mixed audio data is converted into an analog signal by a D / A converter 315, and then output as an audio signal for reproduction via an amplifier 316.
[0028]
The optical disc reproducing apparatus is provided with a terminal 317 for connecting a surround decode unit 401, which is a dedicated device for reproducing surround sound, and audio data is transmitted from the system processor 309 to the surround decode unit 401 through the terminal 317. By transmitting, the surround sound is reproduced. Here, the audio data transmitted to the surround decoding unit 401 is an audio stream of a background sound among all audio streams. Reference numerals 318 and 319 denote switches for switching on / off of outputs from the respective MPEG audio decoders 311 and 312 to the mixer circuit 314. The switching control is performed by a code string of a decoding result obtained by each of the decoders 311 and 312. This is performed based on the audio type of the audio stream determined from. Specifically, when the audio stream is a background sound, the switch is opened, and when the audio stream is a language sound, the switch is controlled to be closed.
[0029]
Next, the operation of the present embodiment, particularly the operation when the surround decoding unit 401 is connected to the terminal 317 and the surround reproduction is performed will be described.
[0030]
When the system processor 309 detects that the surround decoding unit 401 is connected to the terminal 317 based on the connection information returned from the terminal 317, it decodes the MPEG audio decoders 311 and 312 with respect to the input audio data. A request for identification of an audio stream is sent together with the request. Each of the MPEG audio decoders 311 and 312 decodes the audio data according to the decoding request, and identifies whether the audio stream of the audio data is a background sound or a linguistic sound from a code string of the decoding result.
[0031]
When the MPEG audio decoders 311 and 312 recognize that the audio stream is the background sound as a result of the identification of the audio stream, the corresponding switches 318 and 319 are opened to cancel the decoding result, and the audio stream is converted to the language audio. In some cases, the corresponding switches 318 and 319 are closed, and the decoding result is output to the mixer circuit 314.
[0032]
Specifically, since the respective audio streams of the background sound and the linguistic sound are relatively input to the respective MPEG audio decoders 311 and 312, one of the MPEG audio decoders (for example, 311) to which the audio stream of the background sound is input. ) Sets the corresponding switch (eg, 318) to the open state, and the other MPEG audio decoder (eg, 312) sets the corresponding switch (eg, 319) to the closed state, so that the language which is the decoding result of the MPEG audio decoder 312 is set. Only the audio data of the voice is output to the mixer circuit 314. As a result, the audio output from the playback device itself is only the linguistic sound, and all the audio outputs including the surround decoding unit 401 are linguistic sound + surround sound. Thus, according to the optical disk reproducing apparatus of the present embodiment, when the surround decoding unit 401 is connected to the apparatus main body and the surround reproduction is performed, the output of the background sound from the apparatus main body is prohibited, and only the language sound is output. Therefore, it is possible to prevent the quality of the surround sound from deteriorating due to the background sound overlapping the surround sound.
[0033]
The above embodiment relates to an apparatus in which audio data of each unit is composed of a plurality of audio streams, and one audio stream of a background sound and a language audio is selected and reproduced one by one. Is composed of one audio stream, and each of the background sound and the language audio is selected and reproduced one by one from those recorded with the background sound and the language audio mixed in the audio stream. The present invention can be similarly applied to various devices.
[0034]
In the above embodiment, the surround decoding unit 401 is detected to be connected to the terminal 317, and it is determined that the surround decoding unit 401 performs the surround reproduction. It is not limited to. For example, an operation button for receiving an input for instructing execution of surround reproduction is provided on the apparatus main body or a remote controller for remotely controlling the apparatus, and the system processor 309 detects that this button is pressed, and outputs a surround decoder. The unit 401 may be configured to determine that the surround reproduction is performed.
[0035]
Next, still another embodiment of the present invention will be described with reference to FIG.
[0036]
In the present embodiment, a display device 420 for displaying the number of language audio streams included in the audio data of the unit to be reproduced and the language type thereof can be externally connected to the optical disk reproducing device shown in FIG. It is composed.
[0037]
Information related to the language audio stream necessary for performing such display is recorded in the header section of each audio stream, and the system processor 309 reads and recognizes the contents of the header section, so that the result is displayed on the display device 420. Is displayed. Thus, it is possible to inform the user at a glance of the number of language audio streams included in the audio data in units and the language type thereof without actually reproducing all the language audio streams.
[0038]
In addition, as a method of displaying the language type, a method of displaying the content in an image image such as a national flag is effective for prompting the user's intuitive recognition, in addition to a method of displaying the country name in characters.
[0039]
As described above, in each of the embodiments, the reproducing apparatus using an optical disk as a recording medium has been described. However, the present invention is similarly applicable to apparatuses for reproducing other recording media, such as a magnetic tape, a magnetic disk, and a magneto-optical disk. is there.
[0040]
【The invention's effect】
As described above in detail , according to the recording medium reproducing apparatus of the present invention , the surround sound and the background sound are not output simultaneously, and the surround sound is prevented from being degraded due to the background sound overlapping the surround sound. it can.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an optical disc reproducing apparatus according to one embodiment of the present invention.
FIG. 2 is a block diagram showing a configuration of an optical disc reproducing apparatus according to another embodiment of the present invention.
FIG. 3 is a diagram showing a frame structure of MPEG2 audio.
FIG. 4 is a diagram showing a structure of data recorded on an optical disc.
FIG. 5 is a block diagram showing a configuration of a conventional optical disc reproducing apparatus.
[Explanation of symbols]
301: optical disk, 309: system processor, 311, 312: MPEG audio decoder, 314: mixer circuit, 317: terminal, 318, 319: switch, 401: surround decoding unit, 420: display device.

Claims (3)

In a recording medium reproducing device that reproduces a recording medium on which a plurality of types of audio data including a language sound and a background sound are recorded,
Means for selecting any two types of audio data from the plurality of types of audio data;
Means for respectively decoding the two types of selected audio data;
Means for synthesizing and outputting the two types of decoded audio data;
A terminal to which a surround decoder unit for reproducing the audio data of the background sound in surround reproduction can be connected;
Detecting means for detecting that the surround decoder unit is connected to the terminal;
When the detecting means detects that the surround decoder unit is connected to the terminal, a discriminating means for discriminating two types of audio data to be decoded by the decoding means,
A recording medium reproducing apparatus, comprising: means for canceling a decoding result of audio data whose type is determined to be a background sound by the determining means . In a recording medium reproducing device that reproduces a recording medium on which a plurality of types of audio data including a language sound and a background sound are recorded,
Means for selecting any two types of audio data from the plurality of types of audio data;
Means for respectively decoding the two types of selected audio data;
Means for synthesizing and outputting the two types of decoded audio data;
A terminal to which a surround decoder unit for reproducing the audio data of the background sound in surround reproduction can be connected;
Input means for receiving an input for instructing execution of surround reproduction in the surround decoder unit externally connected to the terminal;
Determining means for determining the types of two audio data to be decoded by the decoding means when receiving an input instructing execution of the surround reproduction by the input means;
A recording medium reproducing apparatus, comprising: means for canceling a decoding result of audio data whose type is determined to be a background sound by the determining means . Means for recognizing information about a language sound of the audio data recorded on the recording medium,
Means for outputting display data of the recognized result;
The recording medium reproducing apparatus according to claim 1, further comprising:

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