JPH05197912A - Reproducing device - Google Patents

Abstract

PURPOSE:To reproduce a program in which reproduced sound is not interrupted by reproducing previously a starting part of the specified program stored in memory and reproducing a record of a magnetic tape when the specified program recorded in the magnetic tape is searched. CONSTITUTION:When a program reproducing mode is specified, the system control circuit 8 reads out PCM data of a starting part of the program number M from the memory 7. The selecting circuit 9 selects the PCM data from the memory 7 and outputs it to the D/A converter 5. The circuit 6 commands to the running system control circuit 8 so as to search the program starting part of the program number M. Then, a time cord is reproduced from the magnetic tape 1, and when the position of the magnetic tape 1 agrees with the PCM data read out from the memory 7, the reproduced PCM data of the magnetic tape 1 is outputted to the D/A converter 5 by the selecting circuit 9, the reproduced signal is outputted from the terminal (a).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing apparatus suitable for use in a digital tape recorder or the like capable of reproducing a plurality of programs such as music recorded on a recording medium by changing the reproducing order. is there.

[0002]

2. Description of the Related Art In recent years, so-called digital audio technology for converting an analog signal such as a music signal into a digital signal and recording / reproducing it has been remarkably developed. For example, VTR
There is a PCM processor using the mechanism and tape, a compact disc, DAT and the like. The DAT is described in detail as a DAT cassette in the Japan Electronic Machinery Manufacturers Association Standard CP-2305.

A DAT which is a conventional reproducing apparatus will be described below. FIG. 7 is a block diagram showing the structure of the DAT. In the figure, 21 is a magnetic tape, 22 is a rotary cylinder to which a reproducing head is attached, 23 is a reproducing circuit, 2
4 is a signal processing circuit, 25 is a D / A converter, 26 is a system control circuit, 28 is a running system control circuit, and 2a is an audio signal output terminal.

The reproducing operation of the DAT configured as above will be described. The magnetic tape 21 is wound around the rotary cylinder 22 under the control of the running system control circuit 28 and runs at a constant speed. The reproduction signal obtained from the head on the rotary cylinder 22 is subjected to waveform equalization and the like in the reproduction circuit 23 and output to the signal processing circuit 24. The reproduction signal input to the signal processing circuit 24 is subjected to processing such as demodulation, error correction processing, deinterleaving, etc., and is reproduced as PCM data for D /
It is output to the A converter 27. The PCM data is converted into an analog signal by the D / A converter 27, and the audio output terminal 2
is output to a.

FIG. 8 is a diagram showing a DAT track format. In the same figure, in the main signal area 70, a digital signal obtained by quantizing an audio signal with 16 bits is recorded. Further, in the sub-signal area 71, in addition to the start ID indicating the beginning of the program and the program number indicating the program number, the program time, absolute time,
Time codes such as running time and characters are recorded in groups called packs. By using the information of these sub-signals, the number of the program is specified to move the magnetic tape to the target position (called search), or the playback order of the program is set by the operator instead of the order recorded on the magnetic tape. It is also possible to reproduce in a specified order (called program reproduction).

[0006]

However, in the above-mentioned conventional configuration, when the program reproduction is performed, the reproduction of the current program is completed, and the next program is reproduced by moving the recording medium to the target program position. There was a problem that the reproduced sound was interrupted during that time because the vehicle had to be driven.

An object of the present invention is to solve the above-mentioned conventional problems and to provide a reproducing apparatus capable of performing program reproduction without interruption of reproduced sound.

[0008]

According to a first aspect of the present invention, there is provided a reproducing apparatus comprising: a memory in which reproduced PCM data of a start portion of each program recorded in a recording medium is written; and PCM data read from the memory or a recording medium. Selection means for selecting the PCM data to be reproduced and outputting it to a conversion means for converting the PCM data into an analog signal, and reading the PCM data of the start portion of the program to be reproduced from the memory and outputting it from the selection means, and a recording medium. If the PCM data reproduced from the recording medium matches the PCM data read from the memory, a command is issued to the traveling system control means so as to search for the start portion of the program recorded in the recording medium. Control for controlling to output the PCM data reproduced from And a stage.

According to a second aspect of the present invention, there is provided a reproducing apparatus in which a reproduction PCM data of a start portion of each program recorded on a recording medium and a PCM data of a start portion of a program to be reproduced are read from the memory. The PCM data reproduced from the recording medium is output to the converting means and the traveling system control means is instructed to search the start portion of the program recorded on the recording medium. It is characterized in that a system control means is provided for controlling so as to continuously write the PCM data of the start portion of the program written in the memory and output the written PCM data to the conversion means.

[0010]

According to the structure of the first aspect, the start portion of the program specified when the program is reproduced is read from the memory, and the read PCM data is output to the converting means by the selecting means. While the start portion of the designated program is being reproduced in this manner, the recording medium is run by the running system control means to search for the designated program on the recording medium. PCM data reproduced from the recording medium and P read from the memory
The traveling of the recording medium is controlled so as to match the CM data. If the two match, the timing is captured and the reproduction signal from the recording medium is output to the conversion means by the selection means, so that the program reproduction can be performed without interruption of the reproduced sound between the programs.

According to the structure of claim 2, when the program is reproduced, the start portion of the designated program is read out from the memory from the PCM data of each program written in advance in the memory and is output as a reproduced sound. When the search for the designated program in the recording medium is performed and the reproduction from the recording medium becomes possible, the PCM data reproduced from the recording medium is stored in the memory as the PC of the designated program.
By continuously writing M data and reading from the memory continuously in a ring shape, the reproduction sound is output by switching to the reproduction of the recording medium through the memory, so that the reproduction sound is not interrupted between programs. Program playback can be performed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a block diagram showing the configuration of a reproducing apparatus according to a first embodiment of the present invention. In the figure, 1 is a magnetic tape, 2 is a rotary cylinder to which a reproducing head is attached, 3 is a reproducing circuit for amplifying a reproducing signal obtained by scanning the magnetic tape with the magnetic head, and 4 is a reproducing signal from the reproducing circuit 3. A signal processing circuit for performing processing such as demodulation, error correction, deinterleaving, etc., 5 is a D / A converter,
6 is a system control circuit for controlling the signal processing circuit 4, the memory 7, etc., 7 is a memory for writing and reading the PCM data demodulated by the signal processing circuit 4, 8 is a running system control circuit, and 9 is for reading from the memory 7. A selection circuit for selecting the PCM data and the PCM data reproduced from the magnetic tape 1, a is an audio signal output terminal, b is a program number setting key, and c is a program reproduction key.

Next, the operation of the embodiment apparatus configured as described above will be described. When the magnetic tape 1 is inserted into the reproducing device, initial setting is first performed. The circuit operation at the time of initial setting will be described based on the flowchart of FIG. In step 31, the system control circuit 6 determines whether or not the magnetic tape 1 is newly inserted in the reproducing device. If a positive result is obtained, the magnetic tape 1 is rewound to the starting end in steps 32 and 33. In step 34, the constant N of the target program number is set to 1. In steps 35 and 36, the start portion of the N-th program is reproduced, and the PCM data demodulated by the signal processing circuit 4 is written in the memory 7 for a certain length of time from the start of the program.

At step 37, N + 1 is substituted for the constant N of the target program number. In steps 38 and 39, the N-th program is searched by using the start ID and the program number of the sub-signal recorded on the magnetic tape 1, and it is determined whether or not the program is recorded. If there is an Nth song, the Nth song is written in the memory 7 in steps 35 and 36. If not recorded, the magnetic tape 1 in steps 40 and 41.
Rewind to the beginning and stop.

By performing such initialization, only the start portion of each program recorded on the magnetic tape 1 is written in the memory 7 while associating the program number with the address. FIG. 4 is a diagram showing the relationship between the program recorded on the magnetic tape 1 and the write address position in the memory 7.

The program reproducing operation after the initial setting is performed will be described with reference to the flow chart of FIG. First, the operator of the reproducing apparatus sets the program reproducing order and the program reproducing mode in the system control circuit 6 by using the program number setting key b and the program reproducing key c.

The system control circuit 6 executes steps 51 and 52.
It is determined whether or not the program reproduction order is set and the program reproduction mode is designated. If a positive result is obtained, the first program number obtained in step 51 is substituted for the target program number M in step 53.
In step 54, the PCM data of the start portion of the program with the program number M is read from the memory 7, and the selection circuit 9
Selects the PCM data from the memory 7 and outputs it to the D / A converter 5.

In step 55, the system control circuit 6 gives a command to the traveling system control circuit 8 to search for the start portion of the program with the program number M. Step 56,
At 57, the time code is reproduced from the magnetic tape 1, and the traveling system control circuit 8 finely adjusts the position of the magnetic tape 1 so as to match the PCM data read from the memory 7. When the position of the magnetic tape 1 coincides with the PCM data read from the memory 7, the reproduction circuit PCM data from the magnetic tape 1 is output to the D / A converter 5 by the selection circuit 9 in step 58, and is output from the audio signal output terminal a. A reproduction signal is output.

At steps 59 and 60, the program currently being reproduced is terminated, and if there is a program to be reproduced next, that program number is substituted into the target program number M,
Step 54 and the subsequent steps are repeated. If there is no program to be reproduced, the reproduction of the magnetic tape 1 is ended in step 61 and the program reproduction is ended. As described above, according to the apparatus of the first embodiment, the specified program is searched for on the magnetic tape 1 while the start portion of the specified program is read from the memory 7 and reproduced, and the magnetic tape is searched. 1 so that the PCM data reproduced from 1 and the PCM data read from the memory 7 match.
Is controlled, and if the two match, the timing is captured and switched to the reproduction signal from the magnetic tape,
After that, the designated program is reproduced by the magnetic tape 1. When the reproduction of the designated program on the magnetic tape is completed, the same processing is performed for the program designated next. In this way, while the magnetic tape is running to the target position, the PCM data of the designated program is read from the memory and played back, so that the program can be played back without a sound break between the programs.

FIG. 2 is a block diagram showing the structure of a reproducing apparatus according to the second embodiment of the present invention. The basic structure is the same as that of the first embodiment shown in FIG. 1, and the same reference numerals in FIG. The difference from the first embodiment is that the selection circuit 94 is not provided and the PCM data reproduced from the magnetic tape is output through the memory. Second
The program reproducing operation of the reproducing apparatus according to the embodiment will be described with reference to the flowchart of FIG.

First, the operator of the reproducing apparatus sets the program reproducing order and the program reproducing mode in the system control circuit 6 using the program number setting key b and the program reproducing key c. The system control circuit 6 performs steps 41 and 4
In step 2, it is determined whether the program reproduction order is set and the program reproduction mode is designated. If a positive result is obtained, the first program number obtained in step 41 is substituted for the target program number M in step 43. In step 44, the PCM data of the program start portion of the program number M is read from the memory 7 and output to the D / A converter 5.

In step 45, the system control circuit 6 gives a command to the traveling system control circuit 8 to search for the start portion of the program with the program number M. At step 46, the time code is reproduced from the magnetic tape 1. Step 4
At 7, the system control circuit 6 sets an address to be written in the memory 7, and the reproduced PCM data from the magnetic tape 1 is continuously written in the memory 7. The read address sets the area of the program number M on the memory 7 in a ring shape. Therefore, the reproduction P from the magnetic tape 1
The CM data is delayed by the memory 7 and is D / A converter 5
Is output to.

In step 48, it is determined whether or not the program currently being reproduced has ended. If a positive result is obtained, the process proceeds to step 49. If there is a program to be reproduced next in step 49, the program number is substituted for the target program number M, and the processes from step 43 onward are performed again. If there is no program to be reproduced, the reproduction of the magnetic tape 1 is ended and the program reproduction is ended in step 50.

As described above, according to the device of the second embodiment,
In the case of program reproduction, the start portion of the designated program is read from the memory 7 from the PCM data of each program written in advance in the memory and is output as a reproduced sound, and the magnetic tape 1 is searched for the designated program. When the reproduction from the magnetic tape 1 becomes possible, the PCM data reproduced from the magnetic tape 1 is written in the memory 7 so as to be continuous with the PCM data of the designated program, and the reading from the memory 7 is continuously performed in a ring shape. By doing so, it is possible to switch to reproduction of the magnetic tape through the memory 7. In this way, while the magnetic tape is traveling to the target position, the PCM data previously written in the memory 7 is read and the reproduced sound is output, so that the program reproduction is performed without interruption of the reproduced sound between the programs. be able to.

In the first embodiment, the initial part of each program is reproduced and stored in the memory 7 as an initial setting. However, without making this setting, the program can be loaded into the memory 7 only during normal reproduction. Good. However, in this case, the program cannot be reproduced without interruption of the sound unless the program is reproduced once. Further, in order to save the capacity of the memory 7, a compression circuit is provided between the reproduction circuit 2 and the memory 7, and the memory 7 stores the compressed data,
A decompression circuit may be provided between the memory 7 and the D / A converter 5.

[0026]

According to the reproducing apparatus of the present invention, when a specified program is reproduced, the start portion of the specified program stored in the memory is read and reproduced, and is recorded on the magnetic tape during this time. The specified program is searched, and when the specified program is searched, the specified program recorded on the magnetic tape is reproduced thereafter. Therefore, when the program is reproduced, the reproduced sound is reproduced without interruption between the programs. be able to. Therefore, if it is used as a reproducing apparatus for transmission used in a broadcasting station or the like, program reproduction can be performed without interruption of sound, so that unmanned operation of the transmitting work can be performed and work efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a reproducing apparatus according to a second embodiment of the present invention.

FIG. 3 is a flowchart for explaining initial setting in the first embodiment.

FIG. 4 is a diagram for explaining a relationship between a memory after initialization and a program on a magnetic tape in the first embodiment.

FIG. 5 is a flow chart for explaining a program reproducing operation in the first embodiment.

FIG. 6 is a flowchart for explaining a program reproduction operation in the second embodiment.

FIG. 7 is a block diagram showing the structure of a DAT which is a conventional reproducing apparatus.

FIG. 8 is a diagram showing a track format of DAT.

[Explanation of symbols]

 1 magnetic tape 2 rotating cylinder 3 reproduction circuit 4 signal processing circuit 5 D / A converter 6 system control circuit 7 memory 8 traveling system control circuit 9 selection circuit

Claims (2)

[Claims] 1. A traveling system control means for controlling driving of a traveling system of a recording medium, a reproducing means for reproducing audio signals of a plurality of programs such as music recorded on the recording medium, and a reproducing operation reproduced by the reproducing means. A reproducing apparatus comprising a signal processing means for reproducing a signal as PCM data and a converting means for converting the PCM data processed by the signal processing means into an analog signal, which is recorded on the recording medium. A memory into which the PCM data of the start portion of each program is written, a selection unit that selects the PCM data read from the memory or the PCM data reproduced from the recording medium and outputs the selected PCM data to the conversion unit, and a program to be reproduced. PC at the beginning
The M data is read from the memory and output from the selection means, and at the same time, the traveling system control means is instructed to search the start portion of the program recorded in the recording medium, and is reproduced from the recording medium. PCM
If the data matches the PCM data read from the memory, the system control means is provided to control so that the PCM data reproduced from the recording medium by the selection means is output to the conversion means. Playback device. 2. A traveling system control means for controlling the drive of a rotary cylinder which is a traveling system of a recording medium, a reproducing means for reproducing audio signals of a plurality of programs such as music recorded on the recording medium, and the reproducing means. The reproduced signal is reproduced on the PC
A reproducing apparatus comprising a signal processing means for reproducing processing as M data and a converting means for converting PCM data signal-processed by the signal processing means into an analog signal, each program recorded on the recording medium. Of the start portion of the program to be written, and the PCM data of the start portion of the program to be reproduced are read from the memory and output to the converting means, and the start portion of the program recorded on the recording medium is searched. To the traveling system control means, and when the search is completed, the PCM data reproduced from the recording medium is written in the memory, and the PCM of the start portion of the program is written.
A reproducing apparatus, characterized in that a system control means is provided for controlling so as to write the PCM data continuously and output the written PCM data to the converting means.