JPH0279262A - Pcm audio data recording and reproducing device - Google Patents

Abstract

PURPOSE:To excellently edit a music tape in a simple work by writing PCM audio data of a channel recorded on a recording medium in a memory device, reading the data at an optional time and recording them on this recording medium in other optional position. CONSTITUTION:A memory means 8 capable of storing the PCM (Pulse Code Modulation) audio data is provided, whereas a 1st optional part of the recording medium (magnetic tape) 1 is reproduced and the PCM audio data in this part are stored in this memory means 8, and then the PCM audio data stored in this memory means 8 are recorded on the recording medium 1 in a 2nd optional part. By this method, what is called a time shift can be performed on the PCM audio data as they are, so that the excellent editing of a music tape can be carried out in the simple work, and at the time of reverse reproducing, it is enough that the PCM audio data stored in this memory means 8 is read out in the reverse direction, and hence the reverse reproducing can be simply performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a PCM audio data recording and reproducing apparatus having an editing function.

[Summary of the invention]

The present invention relates to a PCM audio data recording and reproducing apparatus having an editing function, and includes a reproducing means for reproducing PCM audio data recorded on a recording medium, and a PCM audio data recording and reproducing apparatus having an editing function.
a recording means for recording CM audio data; an area specifying means for specifying a first arbitrary portion of the recording medium; and a second arbitrary portion different from the first arbitrary portion;
A memory means capable of storing CM audio data; and a memory means for storing PCM audio data reproduced from the first arbitrary portion designated by the area specifying means among the PCM audio data reproduced by the reproduction means. The recording means includes a writing means for writing, and a reading means for reading out, from the memory means, PCM audio data recorded in a second arbitrary portion designated by the area specifying means among the PCM audio data recorded by the recording means. This allows editing functions such as reverse playback and time shifting to be performed easily.

[Conventional technology]

-a, music editing is performed for record production, broadcast signal production, etc. In this music editing, for example, two tape recorders are used, and the playback signal of a predetermined portion of the tape of the second tape recorder is recorded on a predetermined portion of the tape of the first tape recorder. Chorus A recorded on the first part of the tape is recorded on the second part of the tape, so-called time-shifting,
In addition, desired editing was performed by recording in reverse.

[Problem to be solved by the invention]

In such conventional music editing, two tape recorders are used, which makes the editing work difficult and has the disadvantage of poor workability.

Recently, digitally recorded music tapes have been edited because of their sound quality and other advantages, but since reverse playback is not possible with digital tape recorders, this digitally recorded tape must be edited once. The above-mentioned editing work is performed by dubbing analog recordings with an analog tape recorder, and at this time, it is necessary to connect the analog tape recorder for dubbing every time editing work is done, and by performing this dubbing, There have been disadvantages such as deterioration of sound quality and delicate timing required when synchronizing the analog tape recorder and digital tape recorder, so that this start synchronization has to be repeated many times.

In view of the above, it is an object of the present invention to make it possible to efficiently edit music tapes based on digital recording with simple operations.

[Means to solve the problem]

The PCM audio data recording and reproducing apparatus of the present invention is, for example, as shown in FIG.
Reproducing means for reproducing audio data+21 (31) and recording means for recording PCM audio data on this recording medium (1) (51 and a first arbitrary part of this recording medium ill and this first arbitrary part) Area specifying means (6) for specifying a second arbitrary part different from the part (71
and a memory means that can store PCM audio data (
8), and this area specifying means (6) of the PCM audio data played by this playback means +21 (31).
This memory means (8) stores the PCM audio data played back from this first arbitrary portion specified by (7).
a writing means (9) for writing into the , and this recording means +41
reading means (8) for reading out the PCM audio data recorded in this second arbitrary part designated by this area specifying means (6) (η) out of the PCM audio data recorded by +5) from this memory means (8); 10
).

[For production]

According to the present invention, a memory means (i) capable of storing PCM audio data is provided, and the first arbitrary part of the recording medium (11) is reproduced and the PCM audio data of this part is stored in the memory means (8). This memory means (8
) is stored on the recording medium (11
Since it is recorded in the second arbitrary part of the PC,
So-called time shifting can be performed with M audio data as it is, and good music tape editing can be performed with simple work. Also, when performing reverse playback, the PCM audio data stored in the memory means (8) can be read out from the reverse direction, making it easy to perform reverse playback.

〔Example〕

An embodiment of the PCM audio data recording and reproducing apparatus of the present invention will be described below with reference to the drawings. In FIG.
(2) is a magnetic tape for editing on which audio data is recorded over multiple channels (multi-tracks), for example 4 channels; A channel playback head (2) supplies, for example, 4 channels of PCM audio data played back from the magnetic tape il+ to a playback system signal processing circuit (3).
), time division processing, time axis correction, error correction, interpolation, etc. are performed. On the output side of this reproduction system signal processing circuit (3), there is a 4-channel PCM as shown in FIG. 2A.
A 16-bit parallel one-word signal of audio data is successively repeated for a unit time T, thereby obtaining, for example, four channels of time-division reproduction PCM audio data PB.

The reproduced PCM audio data PB obtained at the output side of the reproduction system signal processing circuit (3) is passed through the pass line (1
2). Further, (13) indicates an external signal input terminal to which music signals etc. from the outside are supplied, and the music signals etc. supplied to this external signal input terminal (13) are input to the analog 13.
In this example, this external signal input terminal (13
) is supplied with four channels of time-division music signals of unit time T. Therefore, this A-D conversion circuit (14
), as shown in FIG. 2B, for example, a 16-bit parallel 1-word signal of 4 channels of PCM audio data synchronized with the reproduced PCM audio data PB is sequentially repeated over a unit time T for 4 channels. Divided human-powered PCM audio data IN is obtained. This A-D
Input PCM audio data IN obtained at the middle input side of the conversion circuit (14) is supplied to the pass line (12) via a gate circuit (15) that performs time-division processing within this unit time T. In this case, the gate signal input terminals (lla) and (15a) of the gate circuits (11) and (15) have second terminals whose phases are different from each other within the respective unit periods T and whose conduction periods do not overlap. Gate signals as shown in Figures C and D (
llb) and (15b), respectively. Therefore, at this time, as shown in FIG. 2, the time-division signal of the reproduced PCM audio data PB and the time-division signal of the input PCM audio data IN exist on the pass line (12) within the unit time T, and this is the time-division signal of the input PCM audio data IN. Reproduction PC that is repeated every
A time-division signal of the time-division signal of the M audio data PB and the time-division signal of the input PCM audio data IN is obtained.

The time division signal as shown in FIG. 2E obtained on this pass line (12) is supplied to a crossfade (16) which performs a crossfade operation in which one of the two PCM audio signals is faded out and the other is faded in. This crossfader (16) is connected to a crossfade coefficient generator (16) by a punch-in signal according to an editing program supplied to a punch-in signal input terminal (16a).
b) and operate this crossfade coefficient generator (16
An increase coefficient signal Kj and a decrease coefficient signal Ki as shown in FIG. A signal is obtained that is the sum of a signal obtained by multiplying the increasing coefficient signal Kj and the other signal obtained by multiplying the decreasing coefficient signal by i. Recording in which the PCM audio data obtained at the output side of the crossfader (16) is recorded on a magnetic tape (1) for editing via a recording system signal processing circuit (4) that adds an error correction code, modulates, etc. Head (5)
supply to.

In this example, the time division signal obtained on this path line (12) as shown in FIG. 3A (same as FIG. 2E) is sent to the random access memory R via the source data selector (7).
The data is supplied to a memory device (8) composed of AM. In this case, it is assumed that the memory device (8) can store music signals for one channel.

Further, this source data selector (7) selects one of the four channels, for example, the second channel, by an enable signal (6a) as shown in FIG. 3B from the source channel comparator (6), and the clock selector (17) ) is reproduced by a rough clock (17PB) or (171N) as shown in Figure 3 C or D.
Select CM audio data PB or input PCM audio data IN. In this case, the source channel comparator (6) and clock selector (17) operate according to instructions from the central processing unit ZCPU, and the source channel comparator (61) operates according to instructions from the central processing unit ZCPU. Channel time division address signal and source channel selection signal input terminal (6
C) and the source channel selection signal from Figure 3B.
An enable signal (6a) as shown in FIG. 1 is formed and this enable signal (6a) is supplied to the source data selector (7). Further, the clock selector (17) selects the reproduced clock signal from the reproduced clock signal input terminal (17a) and the input clock signal from the input clock signal input terminal (17b), and selects the reproduced latch as shown in FIG. 3e or D. clock (17PB) or input rough clock (177PB)
N) to the source data selector (7). A desired channel of music signal selected by the source data selector (7) is supplied to the memory device W (8). Further, in FIG. 1, (18N) and (1B+?) indicate a write signal input terminal and a read signal input terminal, respectively, and when a write signal is supplied to this write signal input terminal (18M), the edge detection circuit ( 9a) detects the rising edge of this write signal, and this edge detection circuit (9a) detects the rising edge of this write signal.
The edge detection signal from a) clears the write address signal generator (9), and the presence of this write signal puts the write address signal generator (9) into an operating state. In this case, when the memory device (8) is in the write state, the write address signal generator (9)
The write at 1/s signal is the address selector (]
9) and is supplied to the memory device (8), at which time the input signal is written in the memory device (8) according to this write address signal.

When a read signal is supplied to the read signal input terminal (18R), the edge detection circuit (10a) detects the rising edge of the read signal, and the edge detection signal from the edge detection circuit (10a) is used to control the read address signal generator. (10) and the presence of this read signal causes this read address signal generator (1
0) is in the operating state. In this case, this memory vtt(8
) is in the read state, the read address signal from the read address signal generator (10) is selected by the address selector (19) and the memory device (
At this time, the memory device (8) reads and outputs the storage signal according to this read address signal.

The memory PCM audio data ME read from this memory device (8) is sent to the memory data latch circuit (20).
and is supplied to the pass line (12) via the gate circuit (21). In this case, the gate signal input terminal (21a) of the gate circuit (21) is connected to the gate circuit (21) as shown in the second figure.
A gate signal similar to the gate signal (15b) supplied to the gate signal input terminal (15a) of 15) is supplied. At this time, the gate signal (15b) is supplied only to either the gate signal input terminal (15a) or (21a), and not to the other.

Therefore, when the music signal stored in the memory device (8) is read out, the signal obtained on the pass line (12) is at the second timing position (channel) of the gate signal (15b).
The time-division input PCM audio data IN in FIG. E becomes the memory PCM audio data ME read from this memory device (8). For this reason, the memory PC from this memory device (8) is controlled by the bunch-in signal supplied to the punch-in signal input terminal (16a) of the crossfader (16).
When the M audio data ME is selected, it is cross-faded with the reproduced PCM audio data F'B in the same way as when the input PCM audio data IN was selected,
In the recording system signal processing circuit (4), an error correction code is added, modulated, and recorded at a predetermined position on the editing magnetic tape (11).

According to this example, an arbitrary part of the magnetic tape (1) is played back and one channel of PCM audio data PB recorded in this part is written in the memory l fi (8),
The PCM audio data PB written in this memory device (8) is read out at any time and added to this magnetic tape.
PCM since it can be recorded in any other part of 1.
You can insert PCM audio data at any position on the magnetic tape +11 without changing the audio data.
So-called time shifting can be easily performed, and good music tape editing can be performed with simple operations. Also,
In the case of τ, reverse playback can be performed by reading out the PCM audio data written in the memory device W(8) from the reverse direction, so there is an advantage that reverse playback can be easily performed.

In addition, in this example, the monitor is performed as described below. In this example, input PCM audio data IN as shown in FIG. The memory PCM audio data ME supplied to the - input terminal of the human selector (22) and obtained at the output side of the memory device (8) is passed through the memory data latch circuit (20) and the gate circuit (21). A memory data latch circuit that latches the input signal only when, for example, the second channel transition selection signal is present at the channel selection signal input terminal (23)! (24), and the output signal of this memory data latch circuit (24) is supplied to the other input terminal f of the input selector (22). In this case, the input selector (
The signal to be monitored by the channel selection signal supplied to 22) is the input PCM of the output of the A-D converter circuit (14).
The channel number of the audio data IN or the memory PCM audio data ME of the memory device (8) is retired. The output signal of this input selector (22) is supplied to one input terminal of the monitor selector (25), and the recording signal 7 obtained on the output side of the crossfader (6) is
The desired signal is supplied to the other input terminal of this monitor selector (25). This monitor selector (25)
At [Yo monitor mode selection signal input terminal (25a
) The signal to be monitored is determined by the monitor mode selection signal supplied to the input selector (22).
This monitor selector (25
) is supplied to the output terminal (26a) of the D-A conversion circuit (26), which converts the digital signal into an analog signal.
) is supplied to the speaker so that the music signal is transmitted to the speaker. In this case, when monitoring the signal to be recorded, the monitor mode of the monitor selector (25) should be set to the output signal side of the crossfader (16).
In addition, the input PCM audio signal of the output of the A-t) conversion circuit (14) is output! When monitoring the memory PCM audio data ME of the desired channel of N or the output of the memory device (3), set the monitor mode of the monitor selector (25) to the input selector (22) side, and input the desired signal to the channel selection signal input terminal. For example, when monitoring the memory PCM audio data ME, the channel selection signal is
It is sufficient to supply a channel selection signal.

It goes without saying that the present invention is not limited to the above-described embodiments, and can take various other configurations without departing from the gist of the present invention.

〔Effect of the invention〕

According to the present invention, any part of the recording medium is played back and the PCM audio data of the channel recorded in this part is written in the memory device (8).
8) Since the PCM audio data written in 8) is read out at an arbitrary time and recorded on any other part of this recording medium, the PCM audio data of this arbitrary position can be read out at any other position on the recording medium as PCM audio data. There is an advantage that audio data can be inserted and so-called time shifting can be easily performed, and a good &W collection of music tapes can be created with simple operations. Further, in this case, if the PCM audio data written in the memory device is read out from the reverse direction of the memory device, there is an advantage that reverse playback can be easily performed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the PCM audio data recording and reproducing apparatus of the present invention, and FIGS. 2 and 3 are diagrams for explaining the present invention, respectively. +l) is a magnetic tape, (2) is a playback head, (3) is a playback system signal processing circuit, (4) is a recording system signal processing circuit, (5)
) is the recording head, (7) is the source data selector, (8
) is the memory device +, (91 is the write address signal generator, (10) is the read address signal generator, (11
), (15) and (21) are gate circuits, (2
1) is a pass line, (13) is an external signal input terminal, (1
6) is the crossfader, (16a) is the punch-in signal input terminal, (18W) is the write signal input terminal, (18R
) is a read signal input terminal.

Claims (1)

[Scope of Claims] Reproducing means for reproducing PCM audio data recorded on a recording medium; recording means for recording PCM audio data on the recording medium; a first arbitrary portion of the recording medium; an area specifying means for specifying a second arbitrary part different from an arbitrary part of the first part; a memory means capable of storing PCM audio data; writing means for writing the PCM audio data reproduced from the specified first arbitrary portion into the memory means; Second
A PCM audio data recording and reproducing apparatus comprising: reading means for reading out the PCM audio data recorded in any part of the memory means.