JPH0325758A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To always obtain the state that an optimum sound is outputted without troublesome manual operation by detecting a broadcasting mode among reproduced multiplex signals and switching the output of the reproduced sound according to the detected mode signal. CONSTITUTION:The multiplex signals b reproduced by a sound reproduction circuit 5 are supplied to a mode signal detection circuit 7 and the broadcasting mode m is detected. To explain more in detail, only the outputted signal of an OCS which is multiplexed by a BPF 16 at the time of recording after the signal b is mixed to it in a MIX circuit 15 is fetched. Next, by detecting the existence of multiplexing or the difference of an oscillation frequency at the time of recording with the aid of a detection circuit 17, the signal m is detected. The mode of the signal m detected in such a way is displayed on a mode display circuit 8. Simultaneously, a sound output switching circuit 6 is automatically switched according to the signal m and the sound corresponding to the broadcasting mode is outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording/reproducing device, and more specifically, to automatic switching of reproduced audio output.

[Conventional technology] Since conventional magnetic recording and reproducing devices do not have the function of recording and reproducing audio multiplex broadcast mode signals, there is no device that can automatically switch the reproduced audio output according to the broadcast mode signal. I didn't.

[Problems to be Solved by the Invention] Conventional magnetic recording and reproducing devices cannot automatically switch the audio output during reproduction as described above.
Switching the audio output when the playback content changes from stereo to polyphonic audio requires the user's own manual operation, which poses a problem in operability in order to obtain the optimal audio output state.

This invention was made in order to solve the above-mentioned problems, and it provides a magnetic recording playback system that can automatically and accurately switch the audio output during playback using an audio multiplex broadcast mode signal. The purpose is to provide one pair of equipment.

[Several Steps to Solve the Problems] The magnetic recording and reproducing device according to the present invention multiplexes and records an audio multiplex broadcasting mode signal onto an audio signal, and switches the audio output switching circuit according to the mode signal detected from the multiplexed signal during reproduction. The present invention is characterized in that it is configured to be switched in accordance with a mode signal.

[Function] According to the present invention, during recording, the audio multiplex broadcast mode signal is detected and multiplexed with the audio signal and recorded, and during playback, the reproduced audio is determined by the broadcast mode signal detected from the multiplexed signal. It becomes possible to automatically switch the output of the mode according to the mode signal. therefore,
Optimal audio output conditions can always be obtained without requiring manual operation.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described based on the drawings.

FIG. 1 is a schematic block diagram showing the configuration of a recording system in audio processing of a magnetic recording/reproducing apparatus according to an embodiment of the present invention. In the figure, (1) is an audio multiplex broadcast decoder which decodes an audio multiplex broadcast signal input manually from a terminal (1a) and extracts the received broadcast mode signal (II1). (2) is an audio/mode/signal multiplexing circuit, and the broadcast mode signal (m) extracted by the above decoder (1)
is multiplexed onto the audio signal (a).

(3) is an audio recording circuit which records the multiplexed signal (b) output from the multiplexing circuit (2) onto a recording medium such as a magnetic tape. (4) is a reception mode display circuit that displays the reception broadcast mode extracted by the decoder (1).

FIG. 3 is a block diagram showing details of the audio/mode signal multiplexing circuit (2), in which (9) and (10) are oscillators with different frequencies (hereinafter referred to as OSC);
(13) is a changeover switch, and the above broadcast mode signal (
m), the above O SC (9). (
10) Select one of the outputs.

(14) is an on/off switch which stops the multiplex operation upon input of the multiplex stop signal (S).

(11) and (12) are mixing circuits (hereinafter referred to as MIX circuits), and the above o s C (9) or (10)
The output of is mixed with the L channel audio signal (a1) and the R channel audio signal (a2) to produce a multiplexed signal (bl).
, (b2) is output.

FIG. 2 is a schematic block diagram showing the configuration of a reproduction system of audio processing in a magnetic recording and reproduction apparatus according to an embodiment of the present invention. In the figure, (5) is an audio reproducing circuit which reproduces the multiplexed signal (b) recorded on the recording medium via the above-mentioned recording system. (7) is a mode signal detection circuit which detects the broadcast mode signal (II1) from the reproduced multiplexed signal (b).

(6) is the audio output switching circuit, and the mode signal detection circuit (7
) The output of the reproduced audio is switched according to the broadcast mode signal (m) detected by the broadcast mode signal (m). (8) is a mode display circuit,
The broadcast mode detected by the detection circuit (7) is displayed.

FIG. 4 is a block diagram showing details of the mode signal detection circuit (7), in which (l5) is a MIX circuit,
The reproduced L channel multiplex signal (bl) and the R channel multiplex signal (h2) are mixed.

(16) is a bandpass filter (hereinafter referred to as BPF)
Then, from the above mixed multiplexed signal, the OS at the time of recording is
Take out only the output signal of C (9) or (lO).

(l7) is a detection circuit that determines whether or not the output signal of the above B P F (+6) is multiplexed and O S C (9), (
10) Detects the difference in the oscillation frequency and generates the broadcast mode signal C.
III) is output.

Next, the operation of the above configuration will be explained.

First, during recording, the receiver 3 broadcast mode signal (l!1) extracted by the audio multiplex broadcast decoder (1) is supplied to the receiver mode display circuit (4) and the audio/mode 3 multiplex circuit (2). , the reception mode is displayed, and the broadcast mode signal (m) is multiplexed with the audio signal (a).

For details, depending on the received broadcast mode signal (m),
The oscillation output of C (9) or OSC (10) with a different frequency is selected by a changeover switch (13).

Next, by controlling the on/off switch (l4), V
After stopping the output during a period when interference due to multiplexing is expected, such as near the switching point of the HS-HIFI system, the output signal of the oscillation frequency corresponding to the broadcast mode signal (m) is output to the MIX circuits (11) and (12). , is mixed into audio signal (a). The thus MIXed multiplexed signal (b) is recorded on a magnetic recording medium in an audio recording circuit (3).

Next, during reproduction, the multiplexed signal (b) reproduced by the audio reproduction circuit (5) is supplied to the mode signal detection circuit (7) to detect the broadcast signal mode (m).

Specifically, in the MIX circuit (15), the reproduced audio signal (b) is MIXL/then multiplexed at the time of recording by B P F (16) O S C (9) or (1
0) is taken out, and then the detection circuit (l
In 7), the broadcast mode signal (m) is detected by detecting the presence or absence of multiplexing and the difference in oscillation frequency during recording.

The mode signal (+) detected in this way is sent to the display circuit (
In step 8), the mode is displayed, and the audio output switching circuit (6) is automatically switched in accordance with the mode signal (+1) to output audio corresponding to the broadcast mode.

[Effects of the Invention] As described above, according to the present invention, the reproduced audio output can be automatically switched using the mode signal of audio multiplex broadcasting, without the need for troublesome manual operations. Optimal audio output conditions can always be obtained.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram showing the configuration of a recording system of a magnetic recording/reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a schematic block diagram showing the configuration of a reproduction system, and FIG. 3 is an audio/mode signal multiplexing circuit. FIG. 4 is a block diagram showing details of the mode signal detection circuit. (1)...Audio multiplex broadcast decoder, (2)...Audio/mode signal multiplexing circuit, (3)...Audio recording circuit, (
5)...Audio reproduction circuit, (6)...Audio output switching circuit, (7)...Mode signal detection circuit. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] (1) An audio multiplex broadcast decoder that detects an audio multiplex broadcast mode signal, an audio/mode signal multiplexing circuit that multiplexes the detected broadcast mode signal into an audio signal, a recording circuit that magnetically records the multiplexed signal, and It is equipped with a reproduction circuit that reproduces the recorded multiplex signal, a mode signal detection circuit that detects the broadcast mode signal from the reproduced multiplex signal, and an audio output switching circuit that switches the output of the reproduced audio according to the detected mode signal. A magnetic recording/reproducing device characterized by: