JPH0291859A - Recorder - Google Patents

Abstract

PURPOSE:To instantaneously perform a recording action simultaneously with the designation of starting recording and to prevent the head part of recording information from being cut by recording digital data in a buffer memory simultaneously with starting recording and successively recording the data in the buffer memory on a tape through a signal processing means after a mechanical mechanism starts up. CONSTITUTION:A digital signal from an input terminal 17 is temporarily stored in the buffer memory 5 through a buffer circuit 18 and a digital I/O circuit 19. When a CPU 6 detects that the mechanical mechanism starts up, the digital data in the memory 5 is successively read out according to a command from the CPU 6 and supplied to a PCM signal processing circuit 7, where specified signal processing is performed to the data. After the data is amplified by an RF amplifier 9, it is recorded on the tape with the rotary head of a drum 10. Then, a reproducing signal obtained by scanning the data with the rotary head is amplified by an RF amplifier 4 and supplied to the circuit 7, where the specified signal processing is performed to the signal, then it is fetched to an output terminal through the digital I/O circuit 19, a buffer circuit 20 and a transformer 21.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to, for example, a digital audio system.

[Summary of the invention]

The present invention provides a recording apparatus including a digital signal generation source that generates digital data, and a signal processing means that processes and records the digital data from the digital signal generation source. A buffer memory is provided in between, and the data from the digital signal generation source is recorded in the buffer memory at the same time as recording starts, and when the mechanical mechanism starts up, the digital data in the buffer memory is sequentially recorded on the tape through the signal processing means. By doing so, the recording operation can be performed instantaneously at the same time as the instruction to start recording is given, and it is possible to prevent the beginning of the recorded information (sound) from being cut off.

[Conventional technology]

Conventional recording devices such as DAT convert analog input signals into PCM data at the same time as recording starts.
This signal processing was performed by a PCM signal processing circuit, but the actual recording onto the tape was started after waiting for the mechanical mechanism to start up.

In other words, the drum was rotated at the same time as recording started, and when the drum reached steady rotation, the pinch roller was next pressed against the drum, and the tape was fed and recording on the tape was started from there.

[Problem to be solved by the invention]

However, in the case of conventional recording devices such as those mentioned above, it takes about 1 second or more for the drum to start up, and it takes even more time for the mechanical mechanism to start up (constant speed running) even from a mechanical state, so it takes a long time for the drum to start up (constant speed running). The actual recording onto tape from (when the record key was pressed) was delayed. Therefore, the recording operation cannot be performed instantaneously at the same time as the recording start instruction is given, and there is a drawback that the beginning of the recorded information (sound) is cut off.

The present invention has been made in view of the above problems, and an object thereof is to provide a recording apparatus that can perform a recording operation instantly at the same time as an instruction to start recording is given.

[Means to solve the problem]

The recording device according to the present invention includes a digital signal generation source (1 to 4.17 to 19) that generates digital data, and a signal processing of the digital data from this digital signal generation source (1 to 4.17 to 19). In a recording apparatus equipped with signal processing means (7 to 10) for recording, digital signal generation sources (1 to 4, 17 to 19) and signal processing means (7 to 19) are provided.
A buffer memo is provided between January 5) and 10), and the digital signal source (1 to 4, 17 to 19) is set up at the same time as recording starts.
The digital data from January 5) is stored in the buffer memo (January 5), and when the mechanical system starts up, the digital data is stored in the buffer memo (January 5).
The digital data contained in the tape is recorded on the tape through signal processing means (7 to 10).

(Function) A buffer memory (January 5) is provided between the digital signal generation source (1 to 4, 17 to 19) and the PCM signal processing circuit (7) of the signal processing means (7 to 10). At the same time as recording starts, the digital data signal generation source (1 to 4.17 to 1
The digital data from 9) is stored in the buffer memory (January 5), and when the mechanical mechanism starts up and stabilizes, the digital data in the buffer memory (5) is sequentially read out and recorded on the tape through the signal processing means (7 to 10). do. Thereby, the recording operation can be performed simultaneously with the instruction to start recording, that is, when the recording key is pressed, and it is possible to prevent the beginning of the sound from cutting off.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the accompanying drawings.

In the figure, (IL) and (IR) are input terminals to which L channel and R channel analog audio signals are supplied, respectively, and the L channel analog audio signal from the input terminal (IL) is connected to a variable resistor (IL). ')
It is supplied to the A/D conversion circuit (4L) through a buffer circuit (2L) and a low-pass filter (3L), where it is converted to digital data (PCM data), and analog audio of the R channel is also output from the input terminal (IR). Signal is variable resistor (IR'), buffer circuit (2R)
and is supplied to the A/D conversion circuit (4R) through the low-pass filter (3R), where the digital data (PCM
data). Note that these (IL-4L) and (IR-4R) form a kind of digital signal generation source.

The digital data converted by the AID conversion circuits (4L) and (4R) is temporarily stored in the buffer memory (5). Then, when the central processing unit (CPU) +61 detects that a mechanical mechanism (not shown) has started up, the CPU
The digital data stored in the sofa memory (5) is sequentially read out according to the command from the Ut61, and the PCM
is supplied to the signal processing circuit (7), where RAM +
81, etc., to undergo predetermined signal processing such as modulation, interleaving, and addition of an error detection code.

The PCM data signal-processed by the PCM signal processing circuit (7) is amplified by the RF amplifier (9) and supplied to a rotating head (not shown) attached to the drum (10). ) recorded above.

On the other hand, the reproduced signal obtained by scanning the tape with the rotating head is amplified by the RF amplifier (9) and supplied to the PCM signal processing circuit (7), where it is demodulated and deinterleaved using RAM +8j etc. Alternatively, it undergoes predetermined 1ε processing such as error detection and correction.

The PCM data signal-processed by the PCM signal processing circuit (7) is supplied to the A/D conversion circuit (12) through a digital filter (11), where it is converted to an analog signal, and the analog audio of the L channel and R channel is generated. Separated into signals.

The separated L channel analog audio signal is passed through a low pass filter (13L) and a buffer circuit (14L).
), and the analog audio signal of the R channel is taken out to the output terminal (15R) through a low-pass filter (13R) and a buffer circuit (14R).

Note that (16L) and (16R) are switches that are turned on during muting. Also, when monitoring the recorded signal during recording, as shown by the broken line in the same figure,
The outputs of the A/D conversion circuits (4L) and (4R) may be directly supplied to the input terminal of the digital filter (11) for listening.

Further, (17) is an input terminal to which a digital signal is directly supplied, and the digital signal from this input terminal (17) is passed through a buffer circuit (18) and a digital 110 circuit (19) to a buffer memory (5). The digital data in the CPU (when the start-up of the mechanical mechanism is detected in 61, the buffer memo is sent by a command from CPU +6j) is sequentially read out and sent to the PCM signal processing circuit (7). The signal is supplied to the signal processing station, where it undergoes predetermined signal processing. After being amplified by the RF amplifier (9), the signal is recorded on the tape by the rotating head of the drum (10). Note that (17) to (19) form a kind of digital signal generation source.

On the other hand, the playback signal obtained by scanning the tape with the rotating head is amplified by the RF amplifier (4) and supplied to the PCM signal processing circuit (7), where it undergoes predetermined signal processing and is converted into a digital 110 circuit (19). ), is taken out to the output terminal (22) via the buffer 1 circuit (20) and the transformer (21).

In this way, in this embodiment, PCM data from the A/D conversion circuits (4L) and (4R) or the digital 110 circuit (19) is stored in the buffer memory (5) at the same time as recording starts, and when the mechanical mechanism starts up, the PCM data is stored in the buffer memory (5). The PCM data in the buffer memory (5) is sequentially transferred to the PCMli processing circuit (7).
Since recording is performed on the tape through the
This prevents the beginning of the sound from cutting off. Furthermore, subcodes such as the so-called star 1-ID signal, which detects the rise of a sound, can be recorded earlier than actually. That is, subcodes can be recorded on tape while the PCM data is in the buffer memory.

In the above-described embodiment, the present invention is applied to a DAT, but it can be similarly applied to other tape recorders having an auto-reverse function.

〔Effect of the invention〕

As described above, according to the present invention, a buffer memory is provided between the digital signal generation source and the signal processing means, and the digital data from the digital signal generation source is stored in the buffer memory at the same time as recording starts, and when the mechanical mechanism starts up, Since the data in the buffer memory is sequentially recorded onto the tape through the signal processing means, the recording operation can be performed instantaneously at the same time as the instruction to start recording, and it is possible to prevent the beginning of the recorded information (sound) from being cut off. can.

[Brief explanation of drawings]

The accompanying drawing is a circuit diagram showing an embodiment of the present invention. (IL), (IR); (7+ is the input terminal, (
2L), (2R), (sl is a buffer circuit, (
3L), (311) is a low pass filter, (4L)
, (411) is the A/D conversion circuit, (5) is the buffer memory, (6) is the central processing unit (CPU), +71
is PCM signal processing circuit, (8) is RAM, +91 is RF
The amplifier is a drum, and (19) is a digital 110 circuit. Agent Sadado Ito Hidemori Matsukuma

Claims (1)

[Scope of Claims] A recording device comprising a digital signal generation source that generates digital data, and a signal processing means that performs signal processing on the digital data from the digital signal generation source and records the digital signal generation source. A buffer memory is provided between the signal processing means, and the digital data from the digital signal generation source is stored in the buffer memory at the same time as recording starts, and when the mechanical mechanism starts up, the digital data in the buffer memory is sequentially processed by the signal processing. A recording device characterized in that it records on a tape through means.