JPS6161285A - Digital tape recorder - Google Patents

Abstract

PURPOSE:To realize a recording cancel function with high accuracy having no rest of erasing by controlling a running based on an address value recorded in an address rack on a tape and memorizing the address value at the time of a start of recording based upon a command. CONSTITUTION:A recording start command is fed to a CPU23, and then the CPU23 stores an address value x at that time in a memory 25, feeds a recording and running command to a mechanical driving portion 26 and a tape 21 begins to run at a recording mode. When a recording cancel command is fed to the CPU23, the tape 21 begins to rewind. At this time, by an address head 22, an address value is regenerated successively as (x+m), (x+m-1)... and fed to a calculating part 24 of the CPU22. In the calculating part 24, a present address value is compared with an address value (x) and a calculation is done and a command to lower the speed of the tape and the like are fed. When the address value (x) is regenerated, by the calculating part 24, a recording standby command is fed to the mechanical driving part 26 since the address value (x) coincides with the address value of a memory part 25 and a tape recorder has a recording standby mode.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a fixed head type digital tape recorder that can control running based on an address code recorded on the tape.

Conventional configurations and their problems In recent years, as music sources have become increasingly digital, with the release of compact disc players and the start of PCM broadcasting via satellite, the development of digital tape recorders, the standardization of standards, etc.
There is a growing momentum for commercialization.

A tape running control system for an analog tape recorder will be explained below. Since the analog cassette tape recorder has only an audio track in its tape format, control is performed based on the counter value of a counter that counts rotational pulses obtained from a rotating body such as a reel stand.

FIG. 1 is a block diagram illustrating the control system of a conventional analog cassette tape recorder, in which 1 is a mechanical block, 2fi take-up reel stand, 3 is a supply reel stand, and 4 is a take-up reel stand for counting rotation pulses. A counter, a driving section for driving the mechanical block 6f'i, 6 a CPU, 7 an operating section, and 8 a magnetic tape.

An embodiment in which the tape recorder of FIG. 1 constructed as described above is controlled based on a counter value will be described using an example of memo I7 repeat. Memory repeat is a mode in which a counter value corresponding to an arbitrary tape position is stored and the tape is repeatedly reproduced from the beginning of the tape to the stored counter value or from the stored counter value to the end of the tape.

When a memory repeat command is issued from the operation unit 7 while the tape is running, the counter value of the counter 4 at that time becomes C.
It is stored in the storage section within the PU6.

When the tape further travels and reaches the end of the tape, a rewind command is supplied from the CPUe to the drive unit 6, and the mechanical block 1 enters the rewind mode. The counter 4 is decremented by the rotation pulse of the take-up reel stand 2.

When the counter value stored in the CPU 5 matches the current counter value, the CPU 5 issues a reproduction traveling command to the drive unit 6.
is supplied, and the mechanical processor and link 1 enter regeneration driving mode.

However, in the control method described above, the counter value indicating any position on the tape is not an absolute address but a relative position with respect to the tape position, and errors due to electrical noise superimposed on rotational pulses, tape sagging, etc. The control accuracy of the tape position was insufficient due to errors caused by various factors. Therefore, it is impossible to accurately search for the recording start position as described in the present invention, and problems such as previously recorded signals remaining unerased may occur.

OBJECTS OF THE INVENTION The present invention provides a tape recorder based on a control method that solves the problems of the conventional method described above. It aims to provide new functions to recorders.

Structure of the Invention The present invention controls travel based on address values recorded in address tracks on a tape, stores address values at the start of recording based on commands, and controls recording canceling means for re-recording. , rewinds to the recording start position with high precision,
This makes it possible to realize a recording canceling function that leaves no erased data.

DESCRIPTION OF THE EMBODIMENTS Before a detailed description of the present invention, the track format and address format of currently proposed fixed head digital tape recorders will be briefly described.

Figure 2 shows the track format 'y, aa'a.

A tape center, 8b is a tape end, 9 to 20 digital audio signal tracks, 10 is an AUX track for recording still images, etc., and 11 is an address track for recording address values, etc. used in the present invention.

FIG. 3 shows the format of the address track, and one minimum unit frame consists of 33.3 ms. 12
is a 5Y with a specific pattern that indicates frame switching.
NC signal, 13 is a frame mode indicating the type of frame, 14 is song number information indicating the song number, 16 is a command to write a control command to a digital audio signal/processing system, etc., 1
6 is each song address indicating the playing time from the beginning of each side, 1
7 digits Address to indicate the absolute address of the tape from the beginning of the tape used in the present invention, and TA to write the tape type information obtained from the cassette half such as tape length and thickness on the 1st.
PE ID 19 is a control for controlling the above-mentioned still image fast Ux track, and 2o is a CRC code for detecting frame errors.

FIG. 4 is a block diagram of essential parts showing one implementation of the present invention, and FIG. 6 is an operation mode diagram. In FIG. 4', 21 is a magnetic tape, 22 is an address head for reproducing address tracks on the tape, and 23 is a CPU 7' which is the center of control, and mainly operates a calculation section 24 and a storage section 25. It consists of

Reference numeral 27 denotes an operation section, which includes a recording start means 28, a recording cancel means 29, and the like. In Figure S, 30
indicates the address track, and the address value is (x−
2)...It is expressed as (x+m).

When a recording start command is supplied to the present embodiment configured as described above in FIG. A recording run command is supplied from the CPU 23 to the mechanical drive unit 26, and the tape 21 starts running in the recording mode.

Next, when the operator determines that the currently recorded music source is unnecessary and turns on the recording cancel means 29 of the operation section 27, a recording cancel command is supplied to the CPU 23, and the CPU
23 commands the mechanical drive unit 26 to rewind, and the tape 2
Start rewinding by one place.

At that time, the address head 22 changes the address value to (x+
m), (3C+m -1)- are played sequentially, and CP
The signal is supplied to the calculation unit 24 in U22. In the calculation section 24,
A comparison calculation is made between the current address value and the address value X stored in the storage section 25, and a command is sent to the mechanical drive section 26 to reduce the tape speed. When the address head 22 reproduces the address value
A recording standby command is supplied to the tape recorder, and the tape recorder enters the recording standby mode.

Effects of the Invention As described above, according to the present invention, by having an address track indicating an absolute address on the tape and storing the address value of the recording start point, a highly accurate recording cancel function is realized. It provides new functionality to digital tape recorders.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the tape running control system of a conventional analog cassette and tape recorder, Figure 2 is an explanatory diagram of the track format of a fixed digital tape recorder, and Figure 3 is an explanatory diagram of its address format. FIG. 4 is a block diagram of a main part of an embodiment of the present invention, and FIG. 6 is an explanatory diagram of the operation mode of the present invention. 22...Address head, 23...C
P U block, 24... Arithmetic unit, 25.'
... Storage section, 26 ... Mechanical drive section, 27.
...Operation unit, 28...Recording start means, 29.
...Means for canceling recording. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 □ and 9 ■ Figure 3

Claims (1)

[Claims] It has an address track on the tape and is composed of a recording start means, a recording cancel means, an address storage section, and an address calculation section, and based on the command of the recording start means,
storing an address value of an address track on the tape in the storage unit, and calculating and comparing the address value on the address track and the stored address value by the address calculation unit based on a command from a recording canceling unit; A digital tape recorder characterized in that it is configured to shift to a recording standby mode when both values match.