JPH0364130A - Automobile radio with playback function - Google Patents

Abstract

PURPOSE:To reproduce the content of other commercial broadcast broadcasting while listening to traffic information and to listen to it thereafter by selecting a ratio between sound recording speed and reproduction speed to be less than the unity when stored information is reproduced. CONSTITUTION:When a playback switch 8 is closed after listening to required traffic information, an output changeover switch 10 is thrown to the position of a D/A converter 6, a voice signal by 8sec stored in a digital memory 5 is read and outputted from a speaker 12 via the D/A converter 6 and an AF amplifier 11. Then the ratio of sound recording speed and reproduction speed at the reproduction thereafter is controlled to be smaller than the unity, the reproduction speed is increased and the timewise delay between a reproduction signal and a signal of a current broadcast is eliminated, resulting that the playback switch 8 is opened when both the signals are coincident. Thus, it is possible to reproduce the content of the other commercial broadcast broadcasting while the traffic information is listened to is reproduced and listened to again.

Description

[Detailed Description of the Invention] [Industrial Application Fields] The present invention is directed to receiving commercial broadcasts and road traffic information broadcasts, and recording the contents of commercial broadcasts broadcast while the road traffic information broadcasts are being received. The present invention also relates to a car radio with a playback function that enables later playback.

[Prior Art] In addition to receiving commercial broadcasts such as AM, automobiles used recently are configured to receive traffic information broadcast using specific frequencies such as 1620 KHz and 1629 KHz. .

In this type of conventional device, when receiving traffic information, a traffic information call button attached to the car radio is operated to receive the 1620 KHz,
Frequencies such as 1629 KHz are captured by a scanning operation, reception of the commercial broadcasting that has been received up to that point is interrupted, and then desired traffic information is received.

[Problems to be Solved by the Invention] According to the above-mentioned conventional device, since radio broadcasts are essentially temporary, other radio broadcasts that cannot be received while traffic information is being received. There was a problem in that it was not possible to listen to the contents of commercial broadcasts again.

The present invention has been made in order to solve the above-mentioned problems, and allows the content of other commercial broadcasts broadcast while listening to traffic information to be played back and re-listened to later. To provide a car radio with a playback function, which enables the reproduction signal to catch up with the audio signal currently being broadcast.

[Means for Solving the Problems] A car radio with playback R function according to the present invention includes: a commercial broadcast tuner and a traffic information broadcast tuner connected in parallel to a receiving antenna; An A/D converter that converts the branch output of the above into a corresponding digital signal: A digital storage means that stores the output from the above A/D converter; A D/A converter that converts the output from the above digital storage means into a corresponding analog signal. : Output switching means for selectively switching and outputting the output from the tuner exclusively for commercial broadcasting, the output from the tuner exclusively for traffic information broadcasting, and the output from the D/A converter; and the attached playback switch is closed. Sometimes, the digital storage means includes a controller that switches and connects the output switching means to the D/A converter side to connect the latest information for a predetermined period of time stored in the digital storage means.

[Function] According to the present invention, while listening to traffic information by switching the output switching means to open the traffic information tuner, the received signal output from the commercial broadcast tuner always remains open for a certain predetermined period of time. The audio signal is stored as the latest audio signal by the unit, and is sequentially discarded as the audio signal becomes obsolete as the predetermined time elapses, and the playback switch attached to the controller is closed. When the output switching means is connected to the D/A converter side, the recorded information is read/played, and the ratio of the recording speed to the playback speed during the playback is controlled to be smaller than 1. The playback speed is increased to catch up with the audio signal currently being broadcast.

Embodiment 1 1- is a schematic configuration diagram showing a car radio with a playback function according to an embodiment of the present invention.

In this Figure 1, the traffic information tuner (3) is
Connected in parallel with the AM tuner (2) connected to the antenna (1), for example, 1620KHz, 1629K
It is tuned to a frequency such as Hz. (4) or 7> are various circuit devices constituting the recording/reproducing circuit, and here, the A/D converter (4) converts the branch output of the AM tuner (2>) into, for example, a cutoff frequency of 4KH.
Filter operation with anti-aliasing filter of z,
The sampling operation at a sampling frequency of 8 KHz results in a data length of 8 bits and a data length of 64 Kb.
The 6-digital memory (5) that converts into digital data with an information amount of ps has a capacity of, for example, 512 Kpi1, and can be used for a predetermined period of time (e.g., about 8 seconds).
It is capable of storing audio signals, and is controlled by a controller (7) to be described later to operate as a so-called ring memory. As a result, audio signals for the predetermined period of time are always stored, and therefore, audio signals that go back more than 8 seconds from the current time are discarded. The D/A converter (6) is equipped with a suitable smoothing filter and converts the information stored in the digital memory (5) into a corresponding analog signal. Controller (7)
When the attached playback switch (8) is closed, the output selector switch (10) is switched to the D/A converter (
6). In the playback mode, the above-mentioned recording and playback circuit controls the playback so that the ratio of the recording speed to the playback speed (-recording speed/playback speed) is less than 1 by a speech compression control means (not shown). Control is performed to increase the playback speed by making the playback sampling frequency higher than the sampling frequency at the time of recording, or by skipping silent parts that exist in the audio signal. . In addition, the light emitting diode (9) is used to display to the listener that playback is in progress when the playback switch (8) is closed.
The F amplifier (11) is for appropriately amplifying the audio signal and applying it to the speaker (12).

The operation of the device configured in this way will be described below. Now, the output selector switch (10) is set to
+ Yuna (2) When the output signal of the AM tuner (2) is broadcast from the speaker (12) via the AP amplifier (11), the output signal of the AM tuner (2) is broadcast from the speaker (12) via the AP amplifier (11), and The branch output of 2) is converted into corresponding digital data by the A/D converter (4), and then stored in the digital memory (5) as an audio signal for the last 8 seconds. Previous audio signals are sequentially discarded. Here, the output selector switch (10) is connected to the traffic information broadcast dedicated tuner (
3), traffic information is received accordingly, but even at this time, AM broadcasting continues to be stored in the digital memory (5). Therefore, when the playback switch (8) is closed after listening to the required traffic information, the output selector switch (lO) is switched to the D/A converter (6> side, and the 8 seconds stored in the digital memory (5) is The D/A converter (6)
From there, it is output from the speaker (12) via the AP amplifier (11).Then, the ratio between the recording speed and the playback speed during subsequent playback is controlled to be smaller than 1. As a result, the playback speed is increased and there is no time delay between the playback signal and the signal currently being broadcast, and as a result, the playback switch (8) is opened when both signals match. be made to do.

Although the above embodiment describes the case of listening to broadcasts related to traffic information, the present invention is not limited to this, but can also be effectively applied to cases where a car phone is used or a conversation is held between fellow passengers, for example. be able to.

[Effect 1 of the Invention As explained above, the playback jR according to the present invention
The equipped car radio includes: a commercial broadcast tuner and a traffic information broadcast tuner connected in parallel to the receiving antenna; an A/D converter that converts the branch output from the commercial broadcast tuner into a corresponding digital signal; A digital storage means for storing the output from the A/D converter; a D/A converter for converting the output from the digital storage means into a corresponding analog signal; an output from the commercial broadcast tuner or t); a traffic information broadcast tuner; output switching means for selectively switching and taking out the output from the D/A converter and the output from the D/A converter; and, when the attached playback switch is closed, the predetermined time period stored in the digital storage means; a controller that switches and connects the output switching means to the D/A converter measurement for the latest information of the digital storage means; when reproducing the stored information of the digital storage means,
Since the above playback is performed with the ratio of the recording speed and playback speed being smaller than 1, it is possible to listen to other commercial broadcasts broadcast while listening to traffic information. In addition to making it possible to play back the content and listen to it again, the playback signal can catch up with the audio signal currently being broadcast, which significantly reduces the awkwardness of having to listen to the commercial broadcast again. The effect of being carried out is produced.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing a car radio with a playback function according to an embodiment of the present invention. (2) is a tuner exclusively for commercial broadcasting (AM), (3) is a tuner exclusively for traffic information broadcasting, (4) is an A/D converter, (5) is a digital memory, and (6> is a D/A converter. (7) is the controller, (8) is the playback switch, (9) is the light emitting diode, (10) is the output selector switch, (11) is the AP amplifier, (12) is the speaker.

Claims (1)

[Claims] (1) A tuner dedicated to commercial broadcasting and a tuner dedicated to traffic information broadcasting connected in parallel to the receiving antenna; A/D converter that converts the branch output from the tuner dedicated to commercial broadcasting into a corresponding digital signal; Digital storage means for storing the output from the D converter; D/A converter for converting the output from the digital storage means into a corresponding analog signal; Output from the commercial broadcast tuner, output from the traffic information broadcast tuner, and Output switching means for selectively switching and taking out the output from the D/A converter; and, when the attached playback switch is closed, the latest information for a predetermined period of time stored in the digital storage means is , a controller for switching and connecting the output switching means to the D/A converter side; when reproducing the stored information in the digital storage means,
A car radio with a playback function, characterized in that the above playback is executed such that the ratio between the recording speed and the playback speed is smaller than 1.