JPH02312500A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To output a sharp sound without level fluctuation by correcting a phase or normal sound or high fidelity sound and outputting the sound while both the phases are made in phase when the high fidelity sound and normal sound are outputted in mixture. CONSTITUTION:A phase correction circuit 7 is added to a reproduction circuit of a normal sound processing circuit 4 and a signal recording on a normal audio track is processed by a normal audio processing circuit 4 and the phase correction circuit 7 is used to correct a high fidelity audio signal and the normal sound in phase. Then when the same signal recorded on the normal audio track and the high fidelity audio track are outputted in mixture, a clear sound is outputted without level fluctuation.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic recording and reproducing device (hereinafter referred to as a hi-fi VTR) having a function of recording and reproducing high-fidelity audio.

BACKGROUND OF THE INVENTION In recent years, many magnetic recording and reproducing devices have a function of recording and reproducing high-fidelity audio, and also have simple editing functions such as after-recording (hereinafter referred to as dubbing) and inserts.

An example of the above-mentioned conventional magnetic recording/reproducing device will be described below with reference to the drawings.

FIG. 2 shows a block diagram of the audio circuit of a conventional high-fidelity VTR. In Figure 2, 1 is a microphone;
2 is a microphone amplifier circuit that amplifies the signal from microphone 1;
3 is LR- which converts the stereo audio signal into a monaural audio signal.
MIX circuit; 4 is a normal audio processing circuit that records and plays back the audio signal made monaural by the LR-MIX circuit 3 on a normal audio track; 5 is a high-fidelity audio processing circuit that records and plays back a human-powered stereo audio signal on a high-fidelity audio track; 6 is normal audio processing circuit 4
and an output signal selection circuit which selects which signal to output from among the signals processed by the high-fidelity audio processing circuit 5.

The operation of the conventional high-fidelity VTR configured as described above will be explained below.

First, regarding the recording system, microphone 1 picks up external sounds, and microphone amplifier 2 amplifies the signal from microphone 1. On the other hand, the LR-MIX circuit 3 makes the audio signal monaural, and the normal audio processing circuit 4 records it on a normal audio track. The other side is microphone amplifier 2.
The stereo audio signal is recorded as it is in stereo onto a high-fidelity audio track by a high-fidelity audio processing circuit 5. Further, the same signal as the signal recorded on each track by each audio processing circuit 4, 5 is converted into an output signal by an output signal selection circuit 6 as a normal audio signal.

A high-fidelity audio signal and a MIX audio signal thereof are selected and outputted from the audio output terminal.

In the playback system, the signal recorded on the normal audio track is processed by the normal audio processing circuit 4, the signal recorded on the high-fidelity audio track is processed by the high-fidelity audio processing circuit 5, and then the output signal selection circuit 6 processes the signal recorded on the high-fidelity audio track. The output signal is a normal audio signal,
A high-fidelity audio signal and a MIX audio signal thereof are selected and outputted from the audio output terminal.

Problems to be Solved by the Invention However, in the above configuration, normal audio and high-fidelity audio are processed by separate circuits, so a phase shift occurs between them, and when trying to output MIX audio, a large level Fluctuations occur. In addition, recently, simple editing functions such as dubbing and inserts have been widely used, and if different audio signals are recorded on the normal audio track and the high-fidelity audio track after being edited using these functions, even if the MIX audio is output, the pre- and post-editing However, as mentioned above, large level fluctuations occur in the unedited parts, making the sound extremely difficult to hear.

In view of the above-mentioned problems, the present invention adds a phase correction circuit to the reproduction circuit of the normal audio processing circuit to match the phases of the audio signals recorded on two different tracks, the normal audio track and the high-fidelity audio track. To provide a high-fidelity VTR that can minimize level fluctuations even when it is desired to simultaneously output these in MIXL.

``Means for Solving the Problems'' In order to solve the two-leg problem, the present invention's high-fidelity VT
R has a configuration in which a phase correction circuit is added to the reproduction circuit of the normal audio processing circuit, and the phases of the normal audio signal and the normal audio signal are made to be in phase.

Effect of the present invention With the above-described configuration, the phases of the normal audio signal and the high-fidelity audio signal are in the same phase, so that when the same signal recorded on the normal audio track and the hi-fi audio track is outputted by MIXL, the level This means that variable (clear) audio can be output.

Example Below, regarding a high-fidelity VTR according to an example of the present invention,
This will be explained with reference to the drawings. FIG. 1 shows a block diagram of an audio circuit of a high-fidelity VTR according to an embodiment of the present invention. In Figure 1, 1 is a microphone, 2 is a microphone 1
3 is an LR-MIX circuit that converts the stereo audio signal into a monaural audio signal;
4 is a normal audio processing circuit that records and plays back the audio signal made monaural by the LR-MIX circuit 3 on a normal audio track; 5 is a high-fidelity audio processing circuit that records and plays back the input stereo audio signal on a high-fidelity audio track; 6 is a normal audio processing circuit; An output signal selection circuit selects which signal to output from among the signals processed by the audio processing circuit 4 and the high-fidelity audio processing circuit 5, and 7 is a phase correction circuit that corrects the normal audio signal to be in phase with the high-fidelity audio signal. It is.

The operation of the high-fidelity VTR configured as described above will be explained below.

First, regarding the recording system, microphone 1 picks up external sounds, and microphone amplifier 2 amplifies the signal from microphone 1. On the other hand, the LR-MIX circuit 3 makes the audio signal monaural and the normal audio processing circuit 4 records it on a normal audio track.

On the other hand, the stereo sound wheel signal from the microphone amplifier 2 is recorded in stereo on a high-fidelity audio track by the high-fidelity audio processing circuit 5. Furthermore, for the same signal recorded on each track by each audio processing circuit 4, 5, the output signal selection circuit 6 selects the output signal as a normal audio signal, a normal audio signal, or a mix audio signal thereof. Output from the audio output terminal.

In addition, in the playback system, the signal recorded on the normal audio track is processed by the normal audio processing circuit 4,
A phase correction circuit 7 corrects the phase of the signal to be in phase with the no.\fi audio signal. /) The signal recorded on the IFAI audio track is processed by the IFAI audio processing circuit 5, and then the output signal selection circuit 6 converts the output signal into a normal audio signal, a high-fidelity audio signal, and their MI
The X audio signal is selected and output from the audio output terminal.

As described below, according to this embodiment, by providing the phase correction circuit 7 in the reproduction system of the normal audio processing circuit 4, the same signal recorded on the normal audio track and the /'%ifi audio track can be reproduced. When outputting with Ml], it is possible to output clear audio without level fluctuation.

In the above embodiment, the phase correction circuit 7 is provided in the reproducing circuit of the normal audio processing circuit, but it may also be provided in the recording circuit of the normal audio processing circuit and the /'%IFI audio processing circuit.

Furthermore, the above embodiment is a camera-integrated VTR.

It may be provided in any stationary high-fidelity VTR.

Effects of the Invention As described above, according to the present invention, the normal audio signal and the high-fidelity audio signal are in phase, so that when the same signals recorded on the normal audio track and the high-fidelity audio track are mixed and output, the level It is possible to obtain excellent effects such as being able to output clear audio without fluctuations.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the audio circuit of a high-fidelity VTR according to an embodiment of the present invention, and FIG. 2 is a block diagram of the audio circuit of a conventional high-t-fi VTR. 1...Microphone, 2...Mic amplifier circuit, 3...LR-MIX circuit, 4...
Normal audio processing circuit, 5... Hi-fidelity audio processing circuit, 6... Output signal selection circuit, 7...
...Phase correction circuit.

Claims (1)

[Claims] Equipped with a function that simultaneously records and plays back high-fidelity audio on a high-fidelity audio track and normal audio on a normal audio track, and when outputting a mix of high-fidelity and normal audio, it corrects the phase of the normal audio or high-fidelity audio and adjusts the phase of both. A magnetic recording/reproducing device characterized in that it outputs signals in phase.