| 摘要 |
In order to provide a continuous supply of background music from cassette tapes, without perceptible cassette change noises, a cassette player has two playing stations at each of which there is a respective tape reading head (13, 14) and a respective tape drive motor (11, 12), and the playing stations are operated alternately. The tapes have recorded on them, in addition to the music recordings, an inaudible lead-out cue signal before the end of the music recording, and an inaudible lead-in cue signal before the beginning of the music recording. The lead-out signal is used to initiate a change over sequence in which the sound from the tape being played is faded out by a digitally controlled fade out/in unit (17), the tape drive motor at the other station is started, a sound selector switch (16) is operated to switch the sound output whilst the fade out/in unit (17) is producing maximum attenuation, in order to avoid switching noise, and when the second tape is reaching its normal playing speed the fade out/in unit is operated to fade in the sound from the second tape. When a new cassette is loaded the lead-in cue signal is used to bring the tape to a ready condition. |
