JP3582995B2 - Cue playback device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cueing playback device capable of cueing and reproducing data such as music output from a recording medium immediately.
[0002]
[Prior art]
In recent years, there has emerged a system such as a mini-disc system that writes data in a recording medium intermittently to a memory at a high transfer rate or in a compressed state, and continuously reads data from the memory at a low transfer rate to reproduce the data. ing. Conventionally, as a method of utilizing the memory, a function of preventing sound skipping during vibration has been mainly developed, but recently, for example, as disclosed in Japanese Patent Application Laid-Open No. 7-21692, music is reproduced. Before starting, write only the beginning of the song to the memory, and when a song playback command is issued, read and play the beginning of the designated song from the memory and write the subsequent data to the memory at the same time. Accordingly, there is a method of eliminating a waiting time until the beginning of a music piece is reproduced.
[0003]
[Problems to be solved by the invention]
However, the above-mentioned prior art publication does not mention the recording format of music, that is, the length and number of continuously recorded areas (defined as “parts”). For this reason, for example, when the length of the music is extremely short or when the music is recorded in an extremely divided manner, a method for detecting the end position of the data written in the memory in advance or when a music playback instruction is issued. There has been a problem that the method of calculating the start position of the subsequent data to be written to the memory becomes complicated.
[0004]
The present invention solves the above-mentioned conventional problems, and makes it possible to reduce the waiting time from when a music playback command such as skip playback or program playback is issued to when sound is output, for music of any recording form. It is an object of the present invention to provide a cueing reproduction device that can be shortened by processing.
[0005]
[Means for Solving the Problems]
In order to achieve this object, a cue reproduction apparatus of the present invention comprises a medium reproducing means for reading data from a recording medium on which a song composed of a single or a plurality of parts and position information of the song are recorded, A first memory for storing a head portion of a music piece in the extracted data, a second memory capable of storing a continuation of the head part of the data, and a positional information storage for storing positional information of the music piece in the data A memory; memory control means for controlling writing and reading of data to the first memory, the second memory, and the position information storage memory; and data reproduction for reading data from the first and second memories through the memory control means. Means, data to be written to the first memory and the second memory, and an order for reading the data in accordance with the information in the position information storage memory. And a data control means for issuing a read / write command to the first memory and the second memory to the memory control means, wherein the data control means stores the data of the head portion of the music in the first memory in advance. At the time of writing, the recording form information according to the form of the part in which the music is recorded is added to the data.
[0006]
With such a configuration, when writing the data of the head part of the music to the first memory in advance, the recording form information corresponding to the form of the part in which the music is recorded, that is, the length of the part, the number of parts, and the like, is stored. When data is read out from the first and second memories and reproduced by only a simple process of adding to data, the data reading method can be changed according to the recording mode information. Regardless of the music in any recording form, sound is output instantaneously when the music playback command is issued.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
According to the first aspect of the present invention, there is provided a medium reproducing means for reading data from a recording medium in which a song composed of a single or a plurality of parts and positional information of the song are recorded, and a head of the song in the read data. A first memory for storing a portion, a second memory for storing a portion following the head portion in the data, a position information storage memory for storing position information of a song in the data, and a first memory Memory control means for controlling writing and reading of data to and from a second memory and a position information storage memory; data reproduction means for reading data from the first and second memories through the memory control means; The data to be written to the first memory and the second memory and the order of reading the data are determined according to the information of the first memory and the first memory. And data control means for issuing a read / write command to the second memory to the memory control means, wherein the data control means records the music when the data of the head portion of the music is written in the first memory in advance. It is characterized in that it is configured to add recording form information according to the form of the part in question to the data.
[0008]
Thus, when the data of the head portion of the music is written in the first memory in advance, the first and the second data can be simply written by adding the recording form information according to the form of the part in which the music is recorded to the first memory. When data is read from the second memory and reproduced, the method of reading data can be changed according to the recording format information, and a music reproduction command is issued for any music in any recording format. Sometimes the sound is output instantaneously.
[0009]
According to a second aspect of the present invention, data of a head portion of a music piece is written in a first memory in advance, and when a music playback command is issued, a designated music piece from the first memory is read. Is performed, and at the same time as performing the read / reproduce operation of the head portion of the data, a write operation of data subsequent to the data written to the first memory is performed to the second memory. When the music is issued and played back from the beginning of the designated music, the start position of the data to be written to the second memory is determined according to the recording form information.
[0010]
Thereby, following the end of the head portion of the designated music, the next portion is appropriately reproduced.
[0011]
According to a third aspect of the present invention, when the music control command is issued and the music is reproduced from the beginning of the designated music when the music reproduction command is issued, the order in which the data is read from the first memory and the second memory is included in the recording form information. It is characterized in that it is configured to be determined accordingly.
[0012]
Thus, similarly to the end of the head portion of the designated music, the next portion is appropriately reproduced.
[0013]
According to the embodiment of the present invention, the data control means writes a predetermined amount of data from the beginning of the music to the first memory in advance via the memory control means, and when the operation ends, the music is recorded. In accordance with the length and number of the parts, three types of recording form information of “next sector continuation code”, “next song reproduction code”, and “next part reproduction code” are added to the data. Note that one or more sectors form one part, and one or more parts form one piece of music.
[0014]
Then, when a music reproduction command is issued and the music is reproduced from the beginning, the start position of the subsequent data to be written to the second memory is determined according to the recording mode information as described above, and is determined via the memory control means. Write to the second memory. Further, the order of reading data from the first memory and the second memory is also determined according to the recording mode information. In this way, the cue reproduction that can reduce the waiting time from when the music reproduction command is issued to when the sound is output can be realized by a simple process for the music of any recording form.
[0015]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a cue reproduction apparatus of the present invention. In FIG. 1, reference numeral 1 denotes an optical disc, which has a predetermined track form and on which compressed data is recorded in sector units. Reference numeral 2 denotes a rotating means for rotating the optical disk 1, 3 an optical pickup for converging a light beam on a recording / reproducing surface of the optical disk 1 to form a light spot and detecting the reflected light, and 4 an optical pickup 3 for the optical disk 1. A feed motor for moving in the radial direction, 5 is an RF amplifier for generating a control signal and an information reproduction signal from the output of the optical pickup 3, 6 is a signal demodulating means for demodulating the information reproduction signal output from the RF amplifier 5, and 7 is a rotation. This is a servo circuit for controlling the means 2, the optical pickup 3, and the feed motor 4. The optical pickup 3, the RF amplifier 5, and the signal demodulating means 6 constitute a medium reproducing means.
[0016]
Reference numeral 8 denotes a position information storage memory for storing position information of the music recorded on the optical disk 1, reference numeral 9 denotes a first memory for storing a head portion of the music, and reference numeral 10 denotes a second memory for storing the entire music. Reference numeral 11 denotes a memory control unit that controls writing and reading of data to and from the first memory 9, the second memory 10, and the position information storage memory 8. Decompression means 12 decompresses the compressed data written in the first memory 9 or the second memory 10. Reference numeral 13 denotes a D / A converter, which converts a digital signal output from the expansion unit 12 into an analog audio signal. The expansion means 12 and the D / A converter constitute a data reproduction means.
[0017]
Reference numeral 14 denotes a microprocessor (hereinafter, referred to as “MPU”) as data control means, and data to be written to the first memory 9 and the second memory 10 according to information in the position information storage memory 8 and an order for reading the data. And issues a read / write command to the first memory 9 and the second memory 10 to the memory control means 11. Reference numeral 15 denotes a key for issuing a music reproduction command.
[0018]
The operation of the cue reproduction apparatus configured as described above will be described below.
First, when the system is stopped or when waiting for intermittent playback, the MPU 14 controls the servo circuit 7 after acquiring the first part position information of the music from the position information storage memory 8 via the memory control means 11. By operating the rotating means 2, the optical pickup 3, and the feed motor 4, the head of the music is accessed to read the information reproduction signal from the optical disk 1. Then, a predetermined amount of data is written into the first memory 9 from the head of the music, that is, from the head via the memory control means 11 (the above operation is defined as "preceding writing"). The preceding writing is performed for a predetermined number of songs, and when the writing is completed, the servo circuit 7 is controlled to stop, for example, the rotating means 2, the optical pickup 3, and the feed motor 4.
[0019]
When an input from the key 15 is detected, the head portion of the music to be reproduced is read out from the first memory 9 via the memory control means 11 and output to the decompression means 12, and the sound is output through the D / A converter 13. I do. At the same time, the servo circuit 7 is controlled to operate the rotating means 2, the optical pickup 3, and the feed motor 4, read an information reproduction signal from the optical disc 1, and store the information reproduction signal in the second memory 10 via the memory control means 11. Write the following data.
[0020]
FIG. 2 is a flowchart describing processing for preceding writing for cueing reproduction executed by the MPU 14, and is indicated by F201 to F212. The operation will be described below.
[0021]
The MPU 14 acquires the first part position information of the music to be written from the position information storage memory 8 via the memory control means 11 (F201). Thereafter, the servo circuit 7 is controlled to operate the rotating means 2, the optical pickup 3, and the feed motor 4, and the head of the music is accessed to read the information reproduction signal from the optical disk 1. Then, a predetermined amount of data is written into the first memory 9 via the memory control means 11 from the beginning of the music. At this time, each time one sector is written, it is determined whether the number of sectors for preceding writing has reached a predetermined amount (F202). If it has not reached the predetermined amount, it is determined whether the address of the data currently being written has reached the end address of the part (F203). If the end address has not yet been reached, the flow returns to the process of F202, and the two determinations are repeated until the determination condition of F202 or F203 becomes true.
[0022]
On the other hand, if the end address of the part has been reached, that is, if the number of sectors of the part is smaller than the predetermined number of sectors to be pre-written, it is determined whether or not the next part exists in the same music (F204). If the next part exists, the position information of the next part is acquired from the position information storage memory 8 via the memory control means 11 (F205), and the process returns to F202. That is, the data of the next and subsequent parts are written until the number of sectors for preceding writing reaches a predetermined amount. If the next part does not exist, it means that the song has ended, so the information to be added to the data (hereinafter referred to as “sector information”) is set as “next song playback code” (F206), and the predetermined number of songs is set. It is determined whether or not the preceding writing has been completed (F212). If the processing has not been completed, the process returns to the processing of F201, and the preceding writing of the next music piece is performed. When the operation is completed, the servo circuit 7 is controlled to stop, for example, the rotation unit 2, the optical pickup 3, and the feed motor 4.
[0023]
FIG. 5 shows a configuration of a sector of the content to be written in the first memory 9 and the second memory 10. Reference numeral 50 denotes sector information for which the MPU 14 can set an arbitrary value; 51, an address recorded on the optical disc 1; and 52, compressed audio data recorded on the optical disc 1. That is, the memory control unit 11 adds sector information when writing data recorded on the optical disc 1 to the first memory 9 and the second memory 10.
[0024]
Even when the number of sectors for preceding writing has reached the predetermined amount, that is, when the determination condition of F202 is true, it is determined whether the address of the data currently being written has reached the end address of the part (F207). If the end address has not yet been reached, that is, if the number of sectors in the part is larger than the predetermined number of sectors to be pre-written, the sector information is set as “next sector continuation code” (F211), and It is determined whether the preceding writing has been completed (F212). If the processing has not been completed, the process returns to the processing of F201, and the preceding writing of the next music piece is performed. When the operation is completed, the servo circuit 7 is controlled to stop, for example, the rotation unit 2, the optical pickup 3, and the feed motor 4.
[0025]
On the other hand, when the end address of the part is reached in F207, that is, when the number of sectors of the part is equal to the predetermined number of sectors to be pre-written, it is determined whether or not the next part exists in the same music (F208). If the next part exists, the sector information is set to "next part reproduction code" (F210). If the next part does not exist, the sector information is set to "next music reproduction code" (F209), and it is determined whether or not the preceding writing of the specified number of music has been completed (F212). If the processing has not been completed, the process returns to the processing of F201 and the preceding writing of the next music piece is performed. When the operation is completed, the servo circuit 7 is controlled to stop, for example, the rotation unit 2, the optical pickup 3, and the feed motor 4.
[0026]
FIG. 6 shows an example of the contents of the first memory 9 when the preceding writing is performed according to the flowchart of FIG. Here, it is assumed that the number of music pieces to be pre-written is 5, the next sector continuation code is "AA", the next music reproduction code is "BB", and the next part reproduction code is "CC". Hereinafter, the preceding writing of each music will be described.
[0027]
First, in the first music, since the length of the part is larger than the length of the preceding writing, the next sector continuation code "AA" is written in the sector information of the last sector of the preceding writing data according to F211 in FIG. In the second song, since the length of the part is equal to the length of the preceding writing, and a plurality of parts exist in the same song, the next part is reproduced in the sector information of the last sector of the preceding writing data according to F210. Write code "CC". In the third song, since the length of the part is shorter than the length of the preceding writing, and a plurality of parts exist in the same song, the first part is written, and then the second part is written ( F205). Then, as shown in FIG. 6, since the length of the next part is longer than the length of the preceding writing, the next sector continuation code "AA" is written in the sector information of the last sector of the preceding writing data according to F211. In the fourth song, since the length of the part and the length of the preceding writing are equal and only one part exists in the same song, the next song is reproduced according to F209 in the sector information of the last sector of the preceding writing data. Write the code "BB". In the fifth song, since the length of the part is shorter than the length of the preceding writing and only one part exists in the same song, the next song reproduction code “BB” is added to the sector information of the sector where the song is completed. Write.
[0028]
As described above, the preceding writing is performed on the first memory 9.
[0029]
FIG. 3 is a flowchart describing a portion for searching for a start position of data to be written into the second memory 10 when a music reproduction command using the cue reproduction method executed by the MPU 14 is issued. This is indicated by F309. The operation will be described below.
[0030]
Upon detecting the input from the key 15, the MPU 14 reads the code of the sector information of the last sector of the preceding write data of the music to be reproduced from the first memory 9 via the memory control means 11 (F301). Then, three types of processing are performed according to the sector information code (F302). First, in the case of "next sector continuation code: AA", the next sector of the last sector in the preceding write data is set as the target address (F305). In the case of "next part reproduction code: CC", the position information of the next part is obtained from the position information storage memory 8 via the memory control means 11 (F303), and the start address of the next part is set as the target address (F304). ). Finally, in the case of "next song reproduction code: BB", it is determined whether or not the head of the next song is written in the first memory 9 (F306). Via the first memory 9, the code of the sector information of the last sector of the preceding write data of the next music piece is read (F309), and the process returns to F302. If it is not written, the position information of the next song is acquired from the position information storage memory 8 via the memory control means 11 (F307), and the start address of the next song is set as the target address (F308).
[0031]
Then, the servo circuit 7 is controlled to operate the rotating means 2, the optical pickup 3, and the feed motor 4, access a target address, read an information reproduction signal from the optical disk 1, and read the second memory via the memory control means 11. Write data to 10.
[0032]
FIG. 4 is a flowchart describing a portion for reading out the preceding write data when the music reproduction command of the cue reproduction method executed by the MPU 14 is issued, and is indicated by F401 to F407. The operation will be described below. The minimum unit of the audio data to be expanded is a sound group (hereinafter referred to as “SG”). One sector consists of 5 SGs. Further, the data reading speed is equal to the reproduction speed of the decompressed data, and is therefore lower than the data writing speed.
[0033]
When the MPU 14 detects an input from the key 15, the MPU 14 reads the head portion of the music to be reproduced from the first memory 9 via the memory control means 11, outputs the read music to the decompression means 12, and outputs audio through the D / A converter 13. I do. At this time, every time one SG is read, the sector information of the sector to which the SG belongs is read (F401). Then, three types of processing are performed according to the sector information code (F402). First, when the code does not correspond to any code, that is, when it is other than the “next sector continuation code”, the “next part reproduction code”, and the “next song reproduction code”, the process returns to F401.
[0034]
In the case of the “next sector continuation code” or “next part reproduction code”, it is determined whether the SG of the data currently being read is the last SG of the sector (F406). In the case of the last SG, the reading is sequentially performed from the beginning of the second memory 10 from the next reading timing (F407), the reading of the data from the first memory 9 is completed, and the normal reproduction processing and Become. If it is not the final SG, the process returns to F401.
[0035]
In the case of the "next song playback code", it is determined whether or not the head of the next song is written in the first memory 9 (F403). If it is not written, the process jumps to the process of F406, and the same process as the case of the “next sector continuation code” or “next part reproduction code” is performed. If it is written, it is determined whether the SG of the currently read data is the last SG of the sector (F404). If not, the process returns to F401. In the case of the last SG, from the next read timing, the next music in the first memory 9 is sequentially read from the beginning (F405), and the process returns to F401.
[0036]
When the above processing is applied to the example of FIG. 6, in the case of the first, second, third and fifth tunes, when the sector information reaches any one of "AA", "BB" and "CC", it reaches the last SG of the sector. From the next timing, the data is sequentially read from the top of the second memory 10 (F407). In the case of the fourth tune, when it reaches the last SG of the sector in which “BB” has been written in the sector information in F404, the next jump to the beginning of the fifth tune in the first memory 9 and read the pre-written portion of the fifth tune. (F405). When the number of sectors in which “BB” has been written in the sector information reaches a predetermined amount, the second memory 10 is sequentially read from the beginning from the next timing.
[0037]
As described above, by adding the sector information code to the preceding write data, the search of the start position of the data to be written to the second memory 10 and the detection of the read end position of the preceding write data can be easily realized.
[0038]
In the case where the length of the part is shorter than the predetermined length for performing the preceding writing, in the present embodiment, the space is left blank for a short time. May be shifted forward by that amount.
[0039]
In the present embodiment, the memory is divided into three pieces of the position information storage memory 8, the first memory 9, and the second memory 10, but these memories may be realized by one memory.
[0040]
【The invention's effect】
As described above, according to the present invention, it is possible to output a sound instantaneously after a music reproduction command is issued for a music in any recording form by a simple process.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of a cue reproduction device according to an embodiment of the present invention.
FIG. 2 is a flowchart showing processing contents of a preceding writing portion in the apparatus of FIG. 1;
FIG. 3 is a flowchart showing a process for searching for a start position of data to be written to a second memory when a music reproduction command is issued in the apparatus of FIG. 1;
FIG. 4 is a flowchart showing processing contents for reading preceding write data when a music reproduction command is issued in the apparatus of FIG. 1;
FIG. 5 is an explanatory diagram of an internal configuration of an information reproduction signal in the device of FIG.
FIG. 6 is an explanatory diagram of the contents of a first memory in the device of FIG. 1;
[Explanation of symbols]
8 position information storage memory 9 first memory 10 second memory 11 memory control means 14 MPU

Claims (3)

A medium reproducing means for reading data from a recording medium on which a song composed of a single or a plurality of parts and position information of the song are recorded; a first memory for storing a head portion of the song in the read data; A second memory capable of storing a continuation of the head portion in the data, a position information storage memory storing position information of music in the data, a first memory, a second memory, and a position information storage. A memory control unit that controls writing and reading of data to and from the memory; a data reproducing unit that reads data from the first and second memories through the memory control unit; The data to be written to the memory and the second memory and the order of reading the data are determined, and the reading to the first and second memories is performed. Data control means for issuing a command to the memory control means, wherein the data control means, when writing the data of the beginning portion of the music in the first memory in advance, according to the form of the part in which the music is recorded A cue reproduction device configured to add the recording form information to the data. The data of the head of the music is written in the first memory in advance, and when the music playback command is issued, the operation of reading and playing the head of the specified music from the first memory is performed. At the same time, it is configured to perform an operation of writing data subsequent to the data written to the first memory to the second memory, and the data control means is issued a music playback command and plays back the data from the beginning of the designated music. 2. The cueing reproduction apparatus according to claim 1, wherein the start position of data to be written to the second memory is determined in accordance with recording form information. The data control means is configured to determine the order in which data is read from the first memory and the second memory in accordance with the recording mode information when the music playback command is issued and the specified music is played from the beginning. 3. The cue reproduction apparatus according to claim 1, wherein

Images