JPH0132597B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a digital recording and reproducing device, and an object of the present invention is to obtain a tape reproducing signal corresponding to the tape position by manually running the tape in both forward and reverse directions at any speed. The object of the present invention is to improve operability by enabling accurate cueing, that is, stop queuing, at any tape position.

Conventional digital recording and reproducing devices, e.g.
With PCM recorders, stop-keying was impossible unless a track was provided on the magnetic tape to record the music signal in analog form. The reason for this is that the recording density on the magnetic tape of PCM recorders is extremely high, and the recording wavelength is extremely short compared to conventional analog recorders, so normal playback is not possible at low speeds.
This is because PCM signals cannot be obtained.

Therefore, with a conventional PCM recorder, cueing can be done in normal playback mode while listening to the playback signal, or by setting up an analog track on the magnetic tape that records an analog signal with the same content as the PCM signal, and using this analog track. They used it to perform stop-keying. However, cueing accuracy is poor when cuing up during playback, and the method of providing an analog track requires a signal delay circuit to maintain in-line between the PCM track and analog track, making the configuration complicated and costly. Since the PCM track and analog track coexist on the magnetic tape, crosstalk of the PCM signal makes it difficult to obtain high-quality reproduced sound.

Therefore, the present invention is intended to eliminate such conventional drawbacks, and one embodiment thereof will be described below.
This will be explained with a drawing of the PCM recorder.

In the figure, if the PCM recorder is in the playback state, the music signal recorded on the magnetic tape 1 is picked up by the playback head 2 as a playback head output signal A, and the playback signal demodulation circuit 3 demodulates and corrects errors. , performs processing such as jitter absorption, etc., and outputs the tape playback signal B, which is input to the storage device 4. On the other hand, the running state of the magnetic tape 1 is detected by detecting the rotation of the rotary encoder 5 due to the running of the magnetic tape 1 with two photointerrupters 6.
If two photo interrupters 6 are provided so that the running detection pulse C that is the output of one photo interrupter 6 and the running detection pulse D that is the output of the other photo interrupter 6 always have a phase difference of 90 degrees, The tape running direction is detected by a running direction detection circuit 7 using these two running detection pulses C and D, and is inputted to a tape position counter 8 as a running direction detection signal E. Tape position counter 8
counts using the running detection pulse D as a clock, and if the running direction detection signal E detects a positive direction, performs an up count, and if the running direction detection signal E detects a negative direction, performs a down count, The running position of the magnetic tape 1 is counted and the count value is sent to the storage device 4 as an address signal F.
shall be. When the PCM recorder is in the playback state, the recording device 4 sends the tape playback signal B to the tape position counter 8.
In response to the address signal F from the address signal F, data is written internally together with the address signal F. When the writing is completed, the PCM recorder enters the stop mode, and when the reel 9 is manually rotated to run the magnetic tape 1, the address signal F, which is the output of the tape position counter 8, indicates that the magnetic tape 1 is running. Changes depending on location. In this manual mode, when the address signal from the tape position counter 8 corresponds to the readout address of the storage contents of the recording device 4, the storage contents of the storage device 4 corresponding to that address are read out and the readout reproduction signal G is output. . Afterwards, this readout playback signal G is digital-to-analog converted back to an analog signal, amplified, and monitored by a speaker to determine the content of the PCM music signal on the magnetic tape and accurately locate the desired tape position. be able to.

As explained above, the digital recording/reproducing device of the present invention solves the disadvantage of not being able to perform stop queuing in conventional devices, and eliminates the problem of crosstalk compared to the case where stop queuing is performed by providing an analog track. The operability of the apparatus can be improved in that a high-quality reproduced signal can be obtained without any noise.

[Brief explanation of drawings]

The drawing is a block diagram of one embodiment of the invention. 1...magnetic tape, 2...playback head, 3...
Reproduction signal demodulation circuit, 4... Storage device, 5... Rotary encoder, 6... Photo interrupter,
7... Running direction detection circuit, 8... Tape position counter, 9... Reel, A... Playback head output signal, B... Tape playback signal, C... Running detection pulse, D... Running detection pulse, E ... Traveling direction detection signal, F ... Address signal, G ... Readout reproduction signal.

Claims (1)

[Claims] 1. A tape running position detection means capable of detecting the running position of the magnetic tape as well as the tape running direction, and counting the current position of the tape based on the tape running position signal and the tape running direction signal from the tape running position detection means. a counting means for reproducing digital data recorded on a magnetic tape; a reproducing means for reproducing digital data recorded on a magnetic tape; a signal corresponding to a tape running position outputted from the counting means as an address signal; and a reproducing digital signal from the reproducing means in a reproducing mode. The memory content written in the playback mode is written together with the address signal, and when the tape running position detecting means is manually activated, the signal corresponding to the tape running position outputted from the counting means is read as an address signal and the address is changed. and a storage device for reading out the magnetic tape, and within the tape position range where the tape playback signal written in the storage device is recorded, the magnetic tape can be moved at any speed in either the forward or reverse direction to the tape running position. A digital recording/reproducing apparatus characterized in that it is configured to read a corresponding tape reproduction signal from the storage device.