JP3500720B2 - Magnetic recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus having a tuner selecting section and a microprocessor for controlling the tuner selecting section. 2. Description of the Related Art In recent years, in a magnetic recording / reproducing apparatus, an audio signal output from a tuner selection section is sent to a main body audio circuit via an audio muting circuit controlled by a timer microcomputer. A conventional magnetic recording / reproducing apparatus will be described below. FIG. 2 is a block diagram showing an audio muting configuration of a conventional magnetic recording / reproducing apparatus. In FIG. 2, 1
Numeral 01 denotes a tuner tuning unit, and tuner tuning unit 10
1 is output from the muting circuit 102
Sent to The muting circuit 102 mutes the sound with a dedicated control signal by the timer microcomputer 103 when a noise sound is generated at the time of channel switching, channel selection of a non-signal channel, or the like. The audio signal passing through the muting circuit 102 passes through the audio circuit 104,
Is output. The audio circuit 104 also has an audio muting function inside, and is controlled by dedicated signals from both the system microcomputer 105 and the timer microcomputer 103. Accordingly, the magnetic recording / reproducing apparatus has two audio muting circuits, and the audio signal from the tuner selection unit 101 passes through the two audio muting circuits. In the above-described conventional configuration, in order to mute the audio output signal from the tuner tuning unit 101, a dedicated timer microcomputer 103 controlling the tuner tuning unit 101 sends the muted signal. Since the control signal and the audio muting circuit 102 are required, there has been a problem that further high-density mounting and rationalization of the magnetic recording / reproducing apparatus and multifunction of the microcomputer will be prevented in the future. The present invention solves the above-mentioned conventional problems, and does not increase the number of signals and circuits currently used.
An object of the present invention is to remove a control signal from a sound muting circuit of a tuner tuning circuit and a timer microcomputer by changing a signal logic. [0006] In order to achieve this object, a magnetic recording and reproducing apparatus according to the present invention receives a television broadcast.
The tuner selection section that can be
Audio circuit that can mute output signal and tuner tuning
When switching channels or selecting a no-signal channel
Output signal to control muting function of audio circuit
Timer microcomputer and audio circuit muting machine
System microcomputer with controllable functions.
In other words, the function of the audio muting of the tuner tuning unit is integrated into the muting function of the main unit audio circuit . With this configuration, the audio mute circuit of the tuner selection section and the dedicated audio mute control signal from the timer microcomputer can be deleted. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 201 denotes a tuner selection unit, 202 denotes an audio circuit, 203 denotes a timer microcomputer,
Reference numeral 04 denotes a system microcomputer. The output signal from the tuner selection unit 201 is output via an audio circuit 202. In order to mute noise generated when a channel is switched or when a non-signal channel is selected, a timer microcomputer 203 is used.
Control signal for audio muting “Se
l Mute (H) "is a signal (SyncL, SyncL, which conventionally controls the muting circuit of the tuner selection unit.
A. By adding the control logic of (Def), the audio muting is integrated into the muting function of the audio circuit 202. This makes it possible to combine the two audio muting circuits used for different purposes into one, and eliminate the muting circuit and the control signal of the tuner selection unit. As described above, according to the present invention, the audio muting circuit of the tuner selection circuit and the exclusive control signal from the microcomputer can be eliminated by changing the logic of the signal from the microcomputer. .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of audio muting of a magnetic recording / reproducing apparatus according to an embodiment of the present invention. FIG. 2 is a block diagram showing a configuration of a conventional audio muting. Explanation 201 Tuner tuning section 202 Body section audio circuit 203 Timer microcomputer

Claims (1)

(57) [Claims] [Claim 1] A tuner selection unit capable of receiving television broadcasting, and an output signal from the tuner selection unit is mixed.
Audio circuit that can be tuned and a tuner
When switching channels or selecting a no-signal channel, the sound
Outputs a signal that controls the muting function of the voice circuit
Timer microcomputer and muting machine for the audio circuit
A magnetic recording / reproducing device equipped with a system microcomputer capable of controlling functions .