JP3389399B2 - Audio playback device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio reproducing device such as a video tape recorder (VTR).

[0002]

2. Description of the Related Art In recent years, when a video is played back in a VTR by fast-forwarding the tape speed at, for example, twice or more, the playback content can be grasped by playing the audio at a normal speed or a speed close to it. Some of these functions (hereinafter referred to as "speech speed conversion function") are on the market.

In such a VTR, since the sound is reproduced at a speed at which the sound can be heard despite the high-speed reproduction, it is very convenient to watch the reproduced image of the VTR in a short time.

On the other hand, a VTR having a CM cut function for skipping a CM is commercially available as a fast-forward reproduction at the time of reproducing a recorded commercial (CM). As a method of performing such a CM skip, when the CM is reproduced, the user presses a key for shifting to the CM skip,
As a result, there is a method of performing fast-forward reproduction and a method of rewinding the tape for a fixed period to correct the tape overshoot by pressing the key again at the time when the CM ends, so that the reproduction screen is displayed.

[0005]

However, if both the speech speed conversion function and the CM cut function as described above are simply installed in the VTR, the user can talk even during fast-forward reproduction in which unnecessary CM portions are skipped. The speed conversion function causes the sound to be reproduced in a audible state, which is very annoying to the user.

In particular, as described above, as a CM skip method, when a system is adopted in which fast-forward reproduction is performed by the first key input and rewind reproduction is performed for a certain period by the next key input, the user is in the CM. During the CM skip by the skip key input, paying attention to the fast-forward playback screen, you have to cancel the CM skip state again when the commercial ends, and by the voice speed conversion function during the fast-forward playback during this CM skip. The sound output impedes the user's attention to the screen, which causes the tape to go too far.

Therefore, the object of the present invention is to solve such a problem.

[0008]

DISCLOSURE OF THE INVENTION The present invention is an audio reproducing apparatus used in a video tape recorder, wherein mode setting means for fast-forward reproduction for skipping unnecessary portions and tape speed higher than usual are set. Even if the reproduction voice is heard, the reproduction voice speed converting means for converting the speed of the reproduction voice, the mute means for muting the output voice signal of the reproduction voice converting means, and the mode setting means for the fast-forward reproduction. And a control means for operating the mute means when the fast-forward reproduction mode is executed.

The mode setting means for fast-forward reproduction is a CM skip key operated by the user.

Further, the mode setting means for fast-forward reproduction detects an audio broadcasting system, pre-records an information signal representing the audio broadcasting system according to the detection result at the time of recording, and this information at the time of reproduction. A signal is detected and fast-forward reproduction is performed. At this time, the detection of the audio broadcasting method is 2
A pilot signal included in an audio signal is detected during audio broadcasting, and the information signal is recorded on a control track of a video tape based on the difference between the pilot signals.

[0011]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a circuit block diagram of an essential part of a VTR embodying the present invention. An audio signal reproduced from an audio track of a magnetic tape T constitutes a speech speed conversion circuit part via an audio circuit 1. The speech speed conversion IC 2 converts the signal from the audio circuit 1 into a speech speed according to an instruction from the control microcomputer (microcomputer) (that is, reproduction of voice). It is designed to output (changing the speed).

The speech speed conversion IC 2 is composed of LC85400E manufactured by Sanyo Electric Co., Ltd. Basically, the bus line 2a and the microcomputer interface 2 are used.
b, memory interface 2c, clock generator 2
d, DSP (Digital Signal Processor) 2g,
And a D / A converter 2h, and the memory interface 2c exchanges data with an external memory (dynamic RAM).

The voice signal input to the speech speed conversion IC 2 is A / D by an ALC (automatic level control) amplifier.
The level is adjusted to match the conversion, and A /
After being converted to a digital signal by the D converter, the DSP writes to the memory and reads from the memory through the interface. The digital signal read from the memory is an analog signal by the D / A converter. Is converted to and output. At this time, the DSP adjusts the writing speed of the voice data to the memory so that the voice signal whose voice speed has been converted can be obtained when the voice data is read at a constant clock.

Reference numeral 4 is a changeover switch circuit section. The switch 4 selects the output signal from the speech speed conversion IC 2 or the output signal from the audio circuit 1 under the control of the microcomputer 7 and outputs it to the mute circuit 5. The mute operation of the mute circuit 5 is also controlled by the control of the microcomputer 7.

Reference numeral 6 is a mechanism section controlled by the control microcomputer 7. Reference numeral 8 is a CM skip key for CM skip.

Next, the operation of the VTR of FIG. 1 will be described with reference to the flowchart of FIG.

First, in step 1 (S1), it is determined whether there is a CM skip key input. When the CM skip key is pressed, it is next determined in step 2 whether the current CM skip mode is set.
If it is not the CM skip mode in step 3, the CM skip mode is shifted to in step 3, and if it is the CM skip mode in step 2, the CM skip mode is canceled in step 4 (S4). The operation in the CM skip mode here is a method in which when the above-mentioned CM is reproduced, the user presses a key for shifting to CM skip, thereby performing fast-forward reproduction.

Next, in step 5 (S5), it is determined whether or not the current voice speed conversion mode is set. If it is determined in step 5 that the voice speed conversion mode is set, the voice speed conversion is performed in step 6. The switch is switched to select the output of IC2 (S6), and when it is determined that the voice speed conversion mode is not set, the switch is switched to select normal voice, that is, the output of the audio circuit 1 (S7).

Then, in step 8 (S8), C again
It is determined whether or not it is the M skip mode. That is, when it is determined in step 8 (S8) that the mode is not the skip mode, the microcomputer 7 does not disable the mute circuit 5 (cancel mute) (S9), and when it is determined in step 8 that the mode is the CM skip mode, the mute is performed. The circuit 5 is activated (S10) (mute on).

In the above embodiment, the CM skip operation is realized by the user manually operating the CM skip key. However, in addition to this, as another embodiment, for example, JP-A-3-177175. As described in Japanese Patent Laid-Open Publication No. 2004-242, the audio broadcasting system is performed by detecting a pilot signal included in the audio signal during the two audio broadcasting, and an information signal indicating the audio broadcasting system based on the difference between the pilot signals (for example, (2 language broadcasting, stereo broadcasting) is recorded in advance on the control track of the video tape at the time of recording, and this information signal is detected at the time of reproduction, and if the information signal represents stereo broadcasting, the information signal is The configuration may be such that the fast-forward mode for performing the fast-forward reproduction for the indicated period is set.

In this embodiment, the speech speed converting IC is used as the reproduced voice converting circuit, but as another embodiment,
For example, it may be configured by the method described on pages 34 to 37 of the magazine "Electronics" April 1993 issue.

[0023]

As described above, according to the present invention, in a VTR equipped with a speech speed conversion circuit, the sound is muted when the CM is skipped, so that it is possible to watch without annoying sound being reproduced when the CM is skipped. effective.

[Brief description of drawings]

FIG. 1 is a block diagram of a main part of a VTR embodying the present invention.

FIG. 2 is a diagram showing a flow chart for explaining the operation of the VTR embodying the present invention.

[Explanation of symbols]

H magnetic head T magnetic tape 2 Speech rate conversion IC 5 Mute circuit 7 Control microcomputer 8 CM skip key

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-177175 (JP, A) JP-A-7-121985 (JP, A) JP-A-9-102934 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) H04N 5/76-5/956

Claims (5)

(57) [Claims] 1. A sound reproducing device used for a video tape recorder, wherein a mode setting means for fast-forward reproduction for skipping unnecessary portions and a reproduced sound can be heard even when a tape speed higher than usual is set. When the fast-forward playback mode is executed by the fast-forward playback mode by the playback-audio speed converting means for converting the speed of the playback audio, the mute means for muting the output audio signal of the playback-audio speed converting means, An audio reproducing apparatus comprising a control means for operating the mute means. 2. The audio reproducing apparatus according to claim 1, wherein the mode setting means for fast-forward reproduction is a CM skip key operated by a user. 3. The mode setting means for fast-forward reproduction according to claim 1, wherein an audio broadcasting system is detected, and an information signal representing the audio broadcasting system is recorded in advance in accordance with the detection result. A voice reproducing device characterized by detecting this information signal during reproduction and performing fast-forward reproduction. 4. The detection of the audio broadcasting method according to claim 3, wherein the pilot signal included in the audio signal is detected during the two audio broadcasting, and the information signal is recorded based on the difference between the pilot signals. An audio playback device characterized by the above. 5. The audio reproducing apparatus according to claim 4, wherein the information signal is recorded on a control track of a video tape.